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1
Orság, Petr. "Mikropáskové vazební směrové a hybridní členy - laboratorní úloha." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217669.
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The diploma thesis deals with the elaboration of a laboratory experiment with basic types of microstrip directional and hybrid couplers in the frequency range up to tens GHz. The thesis is concerned on branch line directional coupler, rat-race directional coupler, De Rondeho coupler, coupled-line coupler, and Lange directional coupler. Simulated results are confronted with measured results obtained by a skalar network analyzer. From overall findings the relevant laboratory experiment was configured and designed.
2
Al, Shamaileh Khair Ayman. "Realization of Miniaturized Multi-/Wideband Microwave Front-Ends." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1437222522.
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LIRA, Davi José Beltrão. "Projeto de acopladores branch-line com Banda dupla usando linhas de Transmissões artificiais." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18381.
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O presente trabalho introduz um novo método para confecção de acopladores híbridos do tipo branch-line que sejam de banda dupla, ou seja, que são projetados para operar em duas frequências desejadas quaisquer com a mesma resposta. Este método faz uso de uma nova estrutura de linha de transmissão artificial (LTA) implementada em microfita, a qual é composta por três linhas de transmissões conectadas em cascata, com estubes em aberto inseridos em paralelo entre as linhas de transmissão. Foram obtidas expressões algébricas que determinam, em função das frequências das bandas desejadas, os valores de impedância característica e comprimento elétrico de cada um dos segmentos e estubes para que, em ambas as frequências, a LTA tenha os mesmos parâmetros de espalhamento que, e portanto seja equivalente a, um único segmento de linha de transmissão convencional com impedância característica e comprimento elétrico quaisquer especificados. Para obter o acoplador híbrido do tipo branch-line com banda dupla, portanto, substituímos cada linha de transmissão do acoplador por uma ATL com os parâmetros calculados de acordo com as expressões encontradas. Essa técnica foi usada para projetar, simular, fabricar e medir um acoplador híbrido branch-line que funcionasse nas frequências GSM de 925MHz e ISM 5.8GHz. Essa técnica tem como principal vantagem a capacidade e a flexibilidade de obter acopladores branch-line com bom desempenho em duas bandas quaisquer.
This work deals with a new method for the design of dual band branch-line hybrid couplers with arbitrary central frequencies, in other words, branch-line couplers which operate in two desired frequencies. This method makes use of a new artificial transmission line (ATL) structure, which is composed of the cascade connection of three transmission lines segments with parallel open stubs between them. Algebraic expressions were obtained that specify, in function of the central frequencies, the values for the characteristic impedance and electric length of the segments, so that the ATL has, for both frequencies, the same scattering parameters, hence the same behavior, as an ordinary transmission line with any chosen characteristic impedance and electric length. To obtain a dual band branch line coupler, the desired frequencies are chosen and the expressions are evaluated to find out the characteristic impedances and electric lengths of the ATL’s to replace all transmission lines that make up the coupler. This technique was used to design, simulate, fabricate and measure a branch-line hybrid coupler that works on the 925MHz GSM and 5.8GHz ISM frequencies. This technique has as it’s main advantage the ability and flexibility to yield couplers with good performance in two arbitrary bands.
4
Lin, Kai-Min, and 林楷閔. "CPW-Fed Branch Line coupler." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94757936144637307799.
Full textAbstract:
碩士國立臺灣大學
電信工程學研究所
95
Abstract In the beginning of this thesis, the basic theory and characteristics of quadrature hybrid coupler, which is also known as branch-line couplers are introduced. Afterwards, we make use of 3-D coupling structures to realize branch-line couplers in multi-layered PCB. In practice, due to the quarter-wave length requirement, the bandwidth of a branch-line coupler hybrid is limited to 10-20%. But, the branch-line coupler we designed is different from the conventional structure. The broadband branch-line coupler has been developed to enlarge operation bandwidth by enhanced impedance matching design at port junctions. Hence, we achieve wideband performance by only one section. At first, we make use of CPW-fed microstrip method to implement the 3-D coupling structures in a single-layered PCB. Using the 3-D coupling structures, the uniplanar circuit design implemented in a single layered PCB can be extended to multi-layered design. This kind of branch-line coupler has the advantages of wideband, flat response on transmission band, and DC current blocking. Since the microstrip lines used in the CPW-fed microstrip branch-line coupler possess serious dispersion phenomenon and radiation loss. One can use strip lines to avoid these disadvantages. Therefore, we further use the method of CPW-fed strip lines to realize the 3D coupling structures to modify the branch-line coupler. There are two main techniques for the transition between a microstrip and CPW. One is the electrical contact, and the other is the electromagnetic coupling. The former usually uses via hole for the electrical contact. The mechanism of the proposed transition for the later is base on the electromagnetic coupling between stripline quarter-wavelength open-stub and CPW quarter-wavelength short-stub. This transition design is capable of inducing strong coupling between CPW and stripline around the resonance frequency. Accordingly, we design two kinds of CPW-fed branch-line coupler in multi-layered PCB to improve insertion loss and radiation loss. Observed from the measurement data, the insertion loss of stripline type is better than that of microstirp type at the same center frequency.
5
Lan, Pei-Gang, and 藍培綱. "Synthesis of Branch-Line Coupler and Coupled-Line Filter with Multiple Bands." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/47149282072376302616.
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碩士國立中正大學
電機工程研究所
101
This thesis included three parts. The first part is design of shunt reactor with open stubs and short stubs, and then we can form a multi-band filter by the shunt reactor. The second part and the third part are application of the first part. The second part is a multi-band branch-line coupler. By the shunt reactor according to first part, we can extend the conventional branch-line coupler to the multi-band branch-line coupler at any frequencies. The third part is a coupled-line filter. Using the shunt reactor we can transform the conventional coupled-line filter into multi-band coupled-line filter, and then analysis the operation frequencies by J-inverter. All circuits in this thesis are simulated with full-wave electromagnetic simulator, and these circuits have been fabricated and measured. The matched results between electromagnetic simulation and measurement can demonstrate the availability of all proposed circuits.
6
JIANG, YONG-HAN, and 江泳翰. "Non-Quarter Wavelength Branch Line Coupler Design." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/crzvm6.
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碩士國立勤益科技大學
電子工程系
106
Conventional branch line coupler is a four ports passive circuit consistsing of two part of parallel transmission lines. Normally, the electrical length of transmission lines is set to quarter wavelength. This restricts the circuit design freedom and layout size. In this thesis, we propose three directions to design non-quarter wavelength branch line coupler. First, we use PI type equivalent circuit on the transmission lines used in conventional branch line coupler. By eliminating the adjacent capacitances at the joints, we can change the electrical length of transmission lines with no susceptance adding. Second, as the method described above, replace two transmission lines as inductors. Last, add open/short stubs to the joints. By adjusting reactance value, we can design the branch line coupler more flexible and freely. All circuits designed by the above mentioned method were fabricated on FR4 substrate and measured by vector network analyzer. The measured and simulated results are in good agreement at the design frequency and these results demonstrate the validity of the approach.
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Chen, Chien-Ming, and 陳建銘. "Study of Multi-band Branch-Line Coupler." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/68713255170410296284.
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碩士逢甲大學
產業研發碩士班
95
Recently, the mobile and WLAN communication system have been used widely In communication industry, and there has been a growing trend towards wideband and dual-band. The requirements of the frequency bands are become more and more. A integrated device for dual-band or multi-band application will be a trend in the future. A smaller circuit dimension is essential for communication components; therefore, it’s necessary for reducing circuit size. This thesis focuses on the design of the coupler with reduced size of the circuits without being lowering the performance of the circuits. A miniaturized dual-band branch-line coupler using the symmetrical T-shape structure and SIR is proposed in this study. This miniaturized design occupied only 40% of the area of the original dual-band branch-line coupler. The bandwidth of the proposed circuit is better than the original dual-band branch-line coupler. This paper also presents the design of novel branch line couplers that can operate at three frequencies and four frequencies. Explicit design formulas of the proposed dual-band coupler are proposed, too. For verification purposes, both simulated and measured results of a microstrip branch-line coupler operating at 900/2400/3500 MHz are included.
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Wang, Chien-wei, and 王建偉. "Studying of Unequal Power Broadband Branch-line Coupler." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54351673511049471734.
Full textAbstract:
碩士逢甲大學
資訊電機工程碩士在職專班
99
The application of Branch-line Coupler in the microwave communication field is broad; also as it comes with distribution and combination of power in function, as well as the unique characteristics of phase variation, it is an inevitable element. However, the disadvantage of the traditional Branch-line Coupler is its narrower working band and more area covered by the circuit. In reviewing the references, most are focused on the traditional Branch-line Coupler as well as trying to widen the band with various methods possible. The results as obtained were found to have over-sized circuit area or deteriorated the flatness of output power and phase variation for the purpose of obtaining wider band. Others are the studies concerning unequal power of power distribution that had turned out rather good achievement. However, it is rare to find the study of two functions in combining the characteristics of bandwidth and unequal power distribution, as well as with high flatness of power output and phase variation in working band. In recent years, the basic concern for the passive circuit in consideration is to minimize the area, reduce the circuit production cost and with better bandwidth. Therefore, in this paper, we try to study a unequal power branch-line couplers with broad band characteristics, and power outputs and phase difference with high flatness characteristics, it need to line with the power output ratio, and 90°± 1° with phase difference. The study will produce unequal power branch-line couplers with low cost, using FR4 board, these couplers can be implemented without additional lumped elements and bonding wires. They will be widely used in microwave communication Circuit systems.
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Lin, Hung-Liang, and 林宏亮. "Design and Implementation Tri-Band Branch-Line Coupler." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/45538764200481120417.
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碩士逢甲大學
通訊工程所
97
Recently, the mobile and WLAN communications system have been used widely in the communication industry, therefore there is a growing for the dual-band or multi-band in the future. This paper presents a new concept of the design of the novel microstrip branch line couplers that can operate at three frequencies. Both simulated and measured results of the microstrip branch-line coupler operating at 900/1600/2600 MHz are included GSM、GPS and WiMAX.
10
Ho, Hao-ping, and 何浩平. "Dual-band branch-line coupler with unequal length." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/95bzxg.
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碩士逢甲大學
通訊工程學系
102
The designed dual-band branch-line couplers with unequal lengths based on three design equations of conventional branch-line coupler. This thesis analyzed the performance of the second designated frequency by adjusting the electrical lengths and impedances on main lines and branch lines. In order to miniaturize the size of circuit, we proposed the T-shaped and resonator structures on branch lines of the designed couplers. The resonator structure only occupies 45% of the circuit area compared to the conventional dual-band coupler design.
11
Lee, Cheng-Yuan, and 李承遠. "Design of Tunable Branch-Line Coupler and Wideband Antenna." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/g723b9.
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碩士國立中正大學
電機工程研究所
103
This thesis includes two parts. The first part is design of tunable branch-line coupler based on varactor diodes. By ultilizing varactor diodes on the four corners of branch-line couper, tunable operating band is achieved with good amplitude and phase difference within operating band. Second part is design of wideband antenna with CPW feed. In order to reach wideband characteristic, four stepped impedance resonator slots which produce additional resonance points are applied to the patch antenna. All the circuits in this thesis are simulated with full-wave electromagnetic simulator, and the circuits have been fabricated and measured. The matched results between electromagnetic simulation and measurement can demonstrate the availability of all proposed circuits. Keywords – tunable branch-line coupler, varactor, CPW, wideband antenna.
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Liou, Chong-Yi, and 劉重儀. "Design and Analysis of Triple-Band Branch-Line Coupler." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/sbu3qz.
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碩士國立臺北科技大學
電腦與通訊研究所
97
This thesis presents a novel microstrip branch-line coupler operating in three frequency bands. The design methodology of triple-band branch-line coupler is established by using the compensation technique to improve the matching property within each passband region. The proposed coupler with compact size is realized by the folded microstrip open-circuited and short-circuited stubs. The measured, full-wave simulated and equivalent-circuit modeled results illustrate a good agreement among them, which validates the design method and shows the advantages of input and output ports are DC grounded and deep rejection between each operating frequency.
13
Yi-Sheng, Wang, and 王奕盛. "An investigation on novel two-section branch line coupler." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9u9br6.
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碩士國立勤益科技大學
電子工程系
106
This thesis proposes three novel two-section branch line coupler circuit designs: two-section non-90-degree branch line coupler, two-section adjustable output power ratio branch line coupler, and two-section high directivity branch line coupler. The first circuit is a non-90-degree structure with the electrical length of the transmission line freely changed, and could provide any output power ratio. The second circuit has adjustable output power ratio property and in the same time reduces the overall size up to 40% comparing with the traditional one. It also provides inductance value changing to make various output power ratios under fixed transmission line length and width. The width of the transmission lines can be selected as 50Ω to reduce the un-necessary discontinuities in the circuit layout. The third circuit is the high directivity branch line coupler design. By adjusting the main line’s electrical lengths and the inductance values will result in different output power ratios. We can also select the main line’s characteristic impedance be 50Ω in order to reduce the effect of the discontinuous. The physical size of this circuit can reduce up to 20% comparing with the conventional circuit size. The simulated and experimental results of all prototypes show a good agreement in the frequency range of testing. All of the circuit designs are very useful for modern RF sub systems.
14
Su, Geng Li, and 蘇耿立. "Branch-line directional coupler technique for VSAT power amplifier." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/14612958343249546615.
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HE, XAING-YI, and 何翔亦. "A Mixed Type Two-section Branch Line Coupler Design." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3hh7ap.
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碩士國立勤益科技大學
電子工程系
107
This thesis proposes two novel two-section branch line coupler circuit designs.: mixed type two section branch line coupler ,and type II mixed two stage branch line coupler. The first circuit is a applied C-L-C pi type equivalent circuit on the central transmission line section and C-TL-C pi type equivalent circuit on the other transmission line sections, and adequate adjusted the electrical length of transmission lines to eliminate all the shunted capacitance generated by pi type equivalent circuit. This circuit area is reduced by 40% compared with the traditional.The second circuit is a applied C-L-C pi type equivalent circuit on the outside transmission line section and C-TL-C pi type equivalent circuit on the other transmission line sections, and adequate adjusted the electrical length of transmission lines to eliminate all the shunted capacitance generated by pi type equivalent circuit. This circuit area is reduced by 30% compared with the traditional.
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Chen, Tse-Yu, and 陳則宇. "Bandwidth-enhanced Branch-line Coupler Using the Center-loaded Vertical Line and Distributed Capacitors, Coupling-dependent Dual-band Branch-line Coupler and Dual-band Rat-race Coupler Based on Folded Substrate Integrated Waveguide." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/6mmjy7.
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碩士國立交通大學
電信工程研究所
102
In this thesis, three types of improvement on branch-line coupler or rat-race coupler are presented. Among these three types of improvement, one of them is suitable for branch-line coupler only. The other two are based on quarter-wavelength transmission line design, so these two are able to be applied on both branch-line coupler and rat-race coupler. The first two chapters introduce the applications, operation principle and theory of branch-line coupler and rat-race coupler. In the third chapter, Bandwidth-enhanced branch-line coupler using the center-loaded vertical line and distributed capacitors is presented. The branch-line coupler is realized through insertion of additional vertical branch as well as distributed capacitors patch on conventional branch-line coupler. Deriving all equations of this schematic, numerical method is applied to obtain optimized parameter. After fabricating this circuit on Rogers 4003 of 20mil, bandwidth of return loss, output balance and output phase are measuring 11%, 3% and 14% wider compared to conventional branch-line coupler. In the fourth chapter, we introduce artificial quarter wave transmission line and its application on branch-line coupler. The TL is dual-band operation based on a pair of couple-line. The higher the coupling coefficient, the closed these two band s are. By investigation of the relation between propagation constant and coupling coefficient, the coupling coefficient merely 0.2 is need to achieve band ratio 2 easy for fabrication. After that, this circuit is fabricated on Rogers Ro 4003 60mil. A CRLH-TL (Composite Right/Left Handed Transmission Line) dual-band rat-race coupler based on FSIW (Folded Substrate Integrated Waveguide) is presented in chapter 5. For purpose of high-Q, high-power, high frequency and low loss application, CRLH quarter-wave length transmission line based on FSIW is designed in this chapter. After that, we assemble six of this identical CRLH transmission line to build a rat-race ring and fabricating on Rogers 5880 bonded by Rogers Bond Film 3001. The measurement bandwidth of these two bands about 15dB return loss, 10 degree phase shift compared to central frequency and 0.5 dB output balance are above 3% and 8% respectively.
17
Tsai, Chih-Hung, and 蔡志弘. "Synthesize the Miniaturized Dual-band Filter and Branch-line Coupler." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/96929904396925106586.
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碩士國立中正大學
電機工程所
95
This thesis included two parts. The miniaturized dual-band filter is proposed in the first part. The transmission zeros of this filter is synthesize with the characteristic impedances of open stub and quarter wavelength microstrip line, which can achieve the second harmonic suppression on the dual-band VCO. Moreover, using the structure of CPW circuit, this filter can be designed with compact size. The second part is the compact branch-line coupler. Two parallel transmission lines are used to displace convention quarter wavelength transmission line, and then the circuit size of designed coupler will be compact. The theorems of two proposed circuits are analyzed detailed in this thesis. Finally, the comparisions among circuit simulation, electromagnetic simulation, and measured results have demonstrated the theory and feasibility of the proposed circuits.
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Wu, Tsan-Chou, and 吳璨州. "Microstrip Dual-Band Branch-Line Coupler With Dual Transmission Lines." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/23190733746785364681.
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Tsao, Kuan-Liang, and 曹冠亮. "X-Band Balanced Power Amplifier Using Novel Branch-line Coupler." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/51439111231700745269.
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碩士國立交通大學
電信工程研究所
86
In this report, we present an X-band balanced power amplifier using a novel microstrip line" DC Blocking Impedance- Transforming Branch-line Coupler(DCITBC)"for mobile satellite communication. Because this novel coupler has the function of dc blocking, which can easily cascade two stage of active circuit together, we can cut down the cost and reduce the circuit size. Therefore, it is suitable for MMIC applications. The X-band power amplifier has three stages. The first stage is a HEMT and the second and the third stages are GaAs MESFET amplifiers. The single-ended power amplifier operated at Class AB for high power-added efficiency with about saturation power 22dBm. In order to obtain high power and high efficiency, we designed balanced amplifier using novel DCITBC. The overall circuit of balanced power amplifier has acheived 9dB gain, 26dBm output power, and near 50% power-added efficiency over the 9.8-10.2GHzband. In addition, the level of second harmonic is less than -40dBc without extra harmonic rejetor.
20
"A novel branch-line coupler design for dual-band applications." 2004. http://library.cuhk.edu.hk/record=b5891882.
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Wong Fai-leung.Thesis (M.Phil.)--Chinese University of Hong Kong, 2004.
Includes bibliographical references (leaves 86-89).
Abstracts in English and Chinese.
ABSTRACT --- p.II
摘要 --- p.III
ACKNOWLEDGMENT --- p.IV
TABLE OF CONTENTS --- p.V
TABLE OF FIGURES --- p.VII
Chapter 1 --- INTRODUCTION --- p.1
Chapter 2 --- BASIC THEORY OF BRANCH LINE COUPLER --- p.4
Chapter 2.1 --- Four-port network --- p.4
Chapter 2.2 --- Even-odd mode analysis --- p.5
Chapter 2.2.1 --- Even mode excitation --- p.6
Chapter 2.2.2 --- Odd mode excitation --- p.7
Chapter 2.2.3 --- Mathematical analysis --- p.9
Chapter 2.3 --- Simulation results --- p.12
Chapter 3 --- REVIEW OF ADVANCED BRANCH LINE COUPLER DESIGNS --- p.15
Chapter 3.1 --- Broad-band uniplanar branch-line design --- p.15
Chapter 3.2 --- Compact branch-line couplers using slow-wave structure --- p.17
Chapter 3.3 --- Miniature branch-line coupler using eight two-step stubs --- p.18
Chapter 3.4 --- Wide band lumped-element 3-dB quadrature coupler --- p.20
Chapter 3.5 --- Dual band branch line coupler design using left-handed transmission lines --- p.22
Chapter 4 --- DESIGN THEORY OF DUAL BAND BRANCH LINE COUPLERS --- p.24
Chapter 4.1 --- design 1 - dual band branch line coupler with sub-optimum performance --- p.25
Chapter 4.1.1 --- Analysis and design --- p.26
Chapter 4.1.2 --- Size comparison --- p.30
Chapter 4.2 --- Design 2 - dual band branch line coupler using shunt stubs --- p.34
Chapter 4.2.1 --- Analysis and design --- p.35
Chapter 4.2.2 --- Size comparison --- p.41
Chapter 5 --- SIMULATION VERIFICATION --- p.44
Chapter 5.1 --- Design 1 --- p.44
Chapter 5.1.1 --- Schematic simulation --- p.45
Chapter 5.1.2 --- Schematic simulation with line width deviation --- p.48
Chapter 5.1.3 --- Schematic simulation with junction discontinuity --- p.54
Chapter 5.2 --- Design 2 --- p.58
Chapter 5.2.1 --- Schematic simulation --- p.58
Chapter 5.2.2 --- Schematic simulation with line width deviation --- p.62
Chapter 5.2.3 --- Schematic simulation with junction discontinuity --- p.68
Chapter 6 --- CIRCUIT IMPLEMENTATION AND CHARACTERIZATION --- p.74
Chapter 6.1 --- Design 1 --- p.74
Chapter 6.1.1 --- Circuit fabrication --- p.74
Chapter 6.1.2 --- Measurement results --- p.75
Chapter 6.2 --- Design 2 --- p.78
Chapter 6.2.1 --- Circuit fabrication --- p.78
Chapter 6.2.2 --- Measurement results --- p.79
Chapter 7 --- CONCLUSIONS --- p.83
Chapter 8 --- RECOMMENDATIONS FOR FUTURE WORK --- p.85
Chapter 9 --- REFERENCES --- p.86
Chapter 10 --- AUTHOR'S PUBLICATIONS --- p.90
21
WANG, LO-KANG, and 王羅綱. "Branch-line Coupler Designed by Selective Adjustable Output Power Ratio." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rscxfz.
Full textAbstract:
碩士國立勤益科技大學
電子工程系
107
This thesis present the research of proposed improve on Branch-line & Rat-Race coupler designed by selective adjustable output power ratio. Both circuits are based on original structure but improved by redesigned、simulated and tested, ameliorate with parallel transmission structure lines. According to user usage through a simply parallel transmission line switch to control changeable output power ratio, can completely achieve user requirements. First circuit is grounded on a Branch-line coupler, determined by connected or disconnection parallel transmission lines, to decide its output ratio distribution. The second circuit is Rat-Race coupler structure allocate with parallel transmission line, output power ratio changed to up/down or left/right connection to the parallel transmission line. Both circuits can be design, simulation and experiment to the requirements, and the output power ratio is determined by the ratio of the parallel transmission lines. The experimental physical circuit was contrived by FR-4 board with 1.6 mm depth and 4.3 relative dielectric. Confirmed by this experiment, the physical circuit measurement are consistent with the simulated circuit results, verify the circuit design proposed in this thesis is truthfully correctness.
22
HUNG, DING-LUN, and 洪鼎倫. "Design of CMOS Branch Line Coupler with Raised-Ground Plane and Meandered-Line Technique." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9yeem5.
Full textAbstract:
碩士國立中正大學
電機工程研究所
104
Abstract The design of compact CMOS branch-line couplers in millimeter-wave bands was presented in this thesis. The ultra-compact chip size was achieved by the combination of capacitive load and ground-plane raise techniques. To demonstrate the proposed design, two branch-line couplers in Q- and V-band were designed in 0.18-m 1P6M standard CMOS technology. The first chip has the simulated 2.2 dB insertion loss, 1.6 dB coupled loss and larger than 15.2 dB return loss in 34-42 GHz. The phase imbalance is ±2°and the amplitude imbalance is±0.7 dB in 34-42 GHz. The chip size is 0.07 mm2, equivalent to 0.0012 λ_"g" ^2, excluding the input and output GSGSG pad area. The second chip achieved a measured insertion loss of 1.8 dB, the coupler loss of 2.1 dB, the return loss of 21.3 dB in 55-65 GHz. The measured phase imbalance is ±2°and amplitude imbalance is ±0.3 dB in 55-65 GHz. The chip size without pad is 0.035 mm2, equivalent to 0.0014 λ_"g" ^2. The measurement results agree very well with the simulation. This demonstrates the proposed capacitive load and the ground-plane raise technique can effectively reduce the chip size while keeping high coupler performance. Index Terms—branch-line coupler, capacitive load, millimeter-wave, CMOS, multilayer circuits, size reduction.
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Jian, Zhang-Liang, and 簡彰良. "An investigation on one-section branch line coupler with open stubs." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/988wu8.
Full textAbstract:
碩士國立勤益科技大學
電子工程系
106
We propose two type of one-section branch line coupler with open-ended stub designs. The first type has two symmetry planes in its structure. The circuit analysis bases on these symmetries could simplify the analysis procedure. Applying the corresponding four sub-circuits, we have the scattering parameters of the circuit. By given the characteristic impedances or the electrical lengths of two transmission line sections, we obtain a highly free design route for any given electrical length and output power ratio. The prototypes are designed, simulated, fabricated, and measured to verify the correctness of the design. Two electrical lengths, 750 and 450 are selected as the examples. The final layouts show 29% and 22% size reduction comparing with the conventional one. In addition, the output power ratio at output and coupling ports are 1:4 and 1:2, respectively. The second type circuit uses two kind of pi type equivalent circuits, C-TL-C and C-L-C. They are applied at two different transmission line sections. Furthermore, the shunted capacitance is converted into open-ended stub to have the same electrical characteristics but easy to fabricate. Also, two prototypes are designed, fabricated, and measured for the validity checking. They have the electrical lengths, 600 and 900, with output power ratios 5:1 and 3:1, respectively. The simulated and experimental results show good agreement with the frequency of interest. The proposed two type of one-section branch line coupler designs are all good in size reduction, freely function changing, and well suited for various RF/microwave circuits.
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-Shian, Yi, and 陳義憲. "Compact microstrip branch-line coupler based on short circuited spur lines." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/89287438193649565233.
Full textAbstract:
碩士國立高雄第一科技大學
電子工程研究所
102
This paper presents a compact microstrip branch-line coupler using short-circuit spur lines. It can not only keep the function of the traditional branch line coupler but also reduce the area of the circuit 39.99% and 54.75%. In this paper we presented short-circuit spur lines equivalent to equal to the quarter-wave transmission line of the miniaturization circuit. This miniaturization circuit is composed of two short-circuit spur lines and the grounding element called y=jb by using parallel connection. In this use of open-circuit stub to achieve the equivalent admittance b, where the open stub is divided into single segment with two-stage. And the parallel admittance y = jb equivalent circuit architecture placed short-circuit spur lines, it can effectively reduce the area of branch line coupler size. The short circuited spur lines branch line coupler is distinguished from the open-circuit stub. The result of the measurement with the single-stage open stubs miniaturized branch line coupler is S_11=-20.96 dB, the power difference|S_21 |-|S_31 |(0±1 dB) bandwidth of 19 MHz, the phase difference∠S_21-∠S_31(〖90〗^o±〖10〗^o) bandwidth of 16 MHz, |S_41 |≤10 dB frequency band of 930~975 MHz, The result of the measurement with the two-stage open stubs miniaturized branch line coupler is S_11=-20.96 dB, the power difference|S_21 |-|S_31 |(0±1dB) bandwidth of 33MHz,the phase difference∠S_21-∠S_31(〖90〗^o±〖10〗^o) bandwidth of 30 MHz, |S_41 |≤10 dB frequency band of 840~945 MHz and total measure of area is 1089 mm^2,reduce the area of the circuit 54.75%. In addition, the paper propose short-circuit spur lines coupler not only area-reduction but also it can further study to pursuit low cost and easy fabrication in the future.
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Chen, Cheng-Heng, and 陳建亨. "Ku-Band Balanced Power Amplifier Using Impedance-Transforming Branch-Line Coupler with DC-Blocking Coupled-Lines." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/06330334961238886934.
Full textAbstract:
碩士國立交通大學
電信工程研究所
84
Abstract In this project, we demonstrate a modified Ku-band microstrip line impedance -transforming branch-line coupler used for a narrowband balanced power amplifier. In this new coupler design, the original four branches of the coupler are replaced by coupled-lines, and the coupled-lines can be chosen carefully to obtain the necessary low impedance, and use the inherent open characteristic to get the DC-isolations between the four ports. This design not only suppr進而esses the high order-mode excitations, which result from the discontinui supreesses T- junctions at high frequencies, it can also make the simulation mties of and the relative size of the circuit reduced. In additions, impedance- tdesign, the overall amplifier circuit area are smaller, high density, and more suitable for MMIC design. In additions, in this project, we program a design procedure for the small-signal model extraction of chip-form MESFET and HEMT. An equivalent large-signal model using the small-signal parameters is derived, and included in the power amplifier design. In this project, the TRL de-embedding method is also discussed for the accuracy measurement of small-signal S-parameters.
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Chen, Yi-Tang, and 陳毅唐. "A Miniaturized 92-95 GHz On-Chip Slow-Wave Branch-Line Coupler." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/mqk6xb.
Full textAbstract:
碩士國立交通大學
電信工程研究所
105
This thesis studies the miniaturization of the 92-95 GHz branch-line coupler.In order to shorten the length of the λ/4 transmission lines used in the branch-line coupler, we utilized the periodic slow-wave structure. In chapter 2, we will describe the theory of the slow-wave structure. We also designed four types of branch-line coupler for which folded transmission lines and periodic slow-wave structures are applied. The area occupied by the coupler can be reduced without performance degradation. Chapter 3 introduces the process provided by National Nano Device Laboratories. Branch-line couplers in this thesis are implemented in this CMOS compatible process. All steps and instruments involved in the run will be briefly introduced in this chapter. The measured results will be shown in chapter 4. In addition to the performances of the four types of couplers and area reduction, the performances in different conditions are discussed. In the end, wafer center-to-edge and waferto-wafer variations will be checked to ensure the reliability of this process. The measured data will help to improve the process.
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Mou, Chai-Hung, and 牟嘉鴻. "Development of Novel Microwave Branch-Line Coupler, Dual-Band Rat-Race Coupler and Wideband Passive Isolation Component." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/38125601258159899186.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
100
The aim of this thesis is to develop microwave branch-line couplers, dual-band rat-race couplers, and the passive isolation component based on new circuits structures. For the branch-line coupler design, asymmetrical E-equivalent sections are used to design lumped-element branch-line couplers with the improvement of the return loss bandwidth. To reduce the number of lumped-elements, in this thesis, the asymmetrical E-equivalent section is further evolved into asymmetrical π- and T- equivalent structures for the branch-line coupler design. For the dual-band rat-race coupler design, L sections are exploited to design dual-band rat race couplers. The L section is composed of a transmission line and a series LC resonator to have the dual-band property. By using L sections, this thesis develops five types of dual-band rat-race couplers. The miniaturized dual-band coupler only occupies a 10 % circuit size of the conventional one at the center frequency of the 1st passband. For the passive isolation component design, three sets of diamond-shape slot-coupled microstrip lines are integrated into a passive isolation component. Since the slot-coupled microstrip can provide a wideband and accurate quadrature phase difference, the developed passive isolation component can effectively improve the isolation level and bandwidth between transmitting and receiving ports. The developed isolation component has a 30 dB isolation of 44.9 %.
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Ku, Chen-Hsiao, and 顧震霄. "Design and Implementation of Dual-band Balance Amplifier using Compact Branch-Line Coupler." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/93049244079128905509.
Full textAbstract:
碩士逢甲大學
資訊電機工程碩士在職專班
94
In communication industry, there has been a growing trend towards wideband and dual-band. The coupler device used in microwave circuit plays an important role in communication. The Hybrid Right/Left-Handed transmission line is of the first important in applications of traditional dual-band coupler. However, this architecture is more complex and expensive in implementation. Mixed microstrip line and lump elements, will produce the issue of dispersive effect in higher frequency, and it will never get rid of the problem of complexity and cost. Thus, this thesis applies planar microstrip line to design a dual-band branch-line coupler to achieve dual-band effect of 900MHz and 2.4GHz. Moreover, we make use of the balance amplifier between this two coupler to reach wideband, system backup, even that we get the purpose of dispensable match network. Utilizing miniaturized technology, it achieves the performance of traditional dual-band branch-line coupler. Besides, it reduced the area of traditional dual-band branch-line coupler up to 60%. Dual-band branch-line coupler was completed by printed circuit, it has the merit of single planar and one-time implementation. Additionally it doesn’t need jump-line and punctures, especially suitable for use in the integrated application of MIC and MMIC. The miniature of dual-band branch-line coupler was designed, and we obtained the verified results as follows: (900MHz) S11=-15.9dB, S21=-3.2dB,S31=-4.3dB,S41=-22.7dB;(2.4GHz)S11=-22.9dB,S21=-3.8dB,S31=-3.9dB,S41=-24.7dB. The balanced amplifier was not tuned to match network sedulously and the afore dual-band branch-line coupler was used at input and output ports. We obtained the verified results as follows:(900MHz)Gain=15.5dB,(2.4GHz)Gain=15dB. It achieved good characteristics of gain.
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Chen, Hsuan-Yu, and 陳宣宇. "Study of a Broadband Branch-line Coupler with Flat Power and Phase Bandwidth." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/76792762945839771694.
Full textAbstract:
碩士逢甲大學
通訊工程所
98
Branch-line couplers are widely used in microwave and millimeter wave communication systems and play an important role because of the dividing/combining properties in power and phase. However, the operation bandwidth is relatively narrow and circuit area is relatively large. In the past, many investigators devoted themselves to broadening bandwidth of the conventional branch-line coupler by means of the various techniques. But they occupies very large circuit dimension or lost the flatted properties of the power and phase bandwidth. On the other hand, much effort has been made to the size reduction which leads to the great improvement of the conventional branch-line coupler. However, the combination both functions with the flatted power and phase bandwidth is still absent. Recently, the small circuit area, multi band and broad band performance, and low fabrication cost are major considerations in the modern passive circuit design. Also, the power and phase imbalance of the broad band branch-line coupler are as flat as possible in order to meet the equirement in the modern communication systems. Therefore, in this thesis, we try to study a planar microstrip branch-line couplers with the flatted power and phase bandwidth for offering alternative broad band designs with low cost. Also these couplers can be implemented in one layer of metal without additional lumped elements, bonding wires, or via holes. They will be very useful for microwave integrated circuits (MIC’s) and monolithic microwave integrated circuits (MMIC’s) applications.
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Chiu, Yu-Chien, and 邱郁蒨. "Design of Miniaturized Wideband Circularly Polarized Patch Antenna with Branch Line Coupler in InFO." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/64592838218668329334.
Full textAbstract:
碩士國立臺灣大學
電信工程學研究所
104
In this paper, we proposed a 38GHz compact and wideband circularly polarized patch antenna design with branch line coupler using InFO-WLP (Integrated Fan-Out Wafer-Level-Packaging) technology using vertically connection in InFO-WLP to miniature size. Firstly, we design a branch-line coupler which can provide two same magnitude output but 90 degrees phase difference. After this, it comes to dual-fed square patch antenna. Lastly, we connected branch-line coupler and square patch antenna by TIVs. By orthogonally fed, it becomes a perfect circularly polarized patch antenna. Miniaturized The design concept of miniaturized and compact CP antenna is almost the same as traditional dual-fed CP antenna. What’s difference between them is the proposed antenna is vertically stacked in order to compact size, we also utilize InFO-WLP technology to reduce path loss and power consumption. Additionally, smaller form factor and high quality factor are two of advantages of InFO-WLP. We use two different feeding structure to achieve our goal. One is coupling-fed and the other one is microstrip line-fed. The results suggested that the coupling-fed one’s impedance bandwidth is 33.3%, 3dB axial ration bandwidth is 17.65%, 3dB gain bandwidth is 8.07% and useful bandwidth is 8.07%. And microstrip line-fed one’s impedance bandwidth is 33.1%, 3dB axial ration bandwidth is 32.41%, 3dB gain bandwidth is 12.8% and useful bandwidth is 12.8%.
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Chan, Chi-Hung, and 詹麒宏. "New Crossover Coupler Design Using Asymmetric Branch-Line Hybrids and Its Dual-Band Operation." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/04074713060043924164.
Full textAbstract:
碩士國立交通大學
電信工程研究所
98
Two asymmetric branch-line hybrids with arbitrary power divisions are cascaded for design of a crossover coupler. The two pairs of the diagonal ports are allowed to have different characteristic impedances. Block ABCD matrices are applied to estimate the bandwidth of the crossover coupler. To achieve the dual-band operation, an elementary two-port is employed to replace the ??4-section of each hybrid. The two-port consists of a stepped-impedance section with two open stubs shunt at both of its ends. By means of the transmission-line theory, analytical equations are formulated to solve the circuit parameters. A circuit designed at 0.9/1.8 GHz is realized and measured to validate the idea.
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Li, Jian-Yu, and 李建育. "Synthesis and Design of Hybrid Ring and Branch Line Coupler Based Wideband Bandpass Filters." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/63370385675871657240.
Full textAbstract:
博士國立交通大學
電信工程研究所
101
This dissertation develops the configurations of hybrid ring and branch line coupler based wideband bandpass filters. The full analysis and systematic synthesis method are also presented. Two kinds of hybrid ring based wideband bandpass filters are proposed according to the position of the controllable transmission zero pair. The filter has a controllable transmission zero pair on the imaginary frequency that they can be arranged to improve the group delay flatness. On the other hand, the filter has a controllable transmission zero pair on the real frequency and the desired stopband suppression can be obtained by adjusting the optimal position of them. Finally, the double-sided parallel-strip stepped-impedance line structure is used to implement a miniaturized hybrid ring wideband bandpass filter with a notched band and an improved upper stopband. In addition, two types of branch line coupler based wideband bandpass filters are demonstrated. One has a transmission zero pair, and the other has two transmission zero pairs. They have good selectivity. To the best of our knowledge, the wideband branch line coupler based bandpass filter has not yet been presented before.
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Lu, Zheng-Liang, and 盧政良. "Analysis and Design of Lumped- and Distributed- Element Branch-Line Coupler with Arbitrary Power Division." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/42054620414191206096.
Full textAbstract:
碩士國立交通大學
電信工程系所
97
This thesis designs a 3-section wideband branch-line coupler with an arbitrary power division. Through the even/odd mode analysis, the arbitrary power division can be achieved by controlling the characteristic impedances of the branch lines. Meanwhile, for a specified power division, the fractional bandwidth can be predicted theoretically. The 3-section branch-line couplers are implemented by lumped elements and lumped distributed elements to reduce the circuit size. Theoretical analysis is validated by measurement results of experimental circuits.
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Chang, Yu-Fang, and 張毓芳. "Design and Implementation of Miniaturized Dual-band Branch Line Coupler for WiMAX and GSM Application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/31418558367174449649.
Full textAbstract:
碩士逢甲大學
通訊工程所
97
In this thesis, the miniaturized branch-line coupler with dual-band for WiMAX and GSM application will be designed and implemented. It must have the characteristics of compact size and dual-band. In order to accord with the characteristics of dual-band, wide-band and small size, we propose several kinds of reducing size method in this research, and will apply it to the dual-band coupler. Furthermore, without any implementation of lumped elements, bonding wires, and via holes is proposed. The requirement of bandwidth is a big problem. We add capacitance to increase the bandwidth. In addition, use of coupling between line and line to make the phase become more and more flat. Above circuits have good agreement between simulation and measurement results. We will realize above couplers with PCB technology. Because of the consideration of exact phase different, high stability in the substrate and low cost, RO4003 is the best choice. It is suitable for couplers designing.
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Wang, Tong-Lin, and 王東林. "Design and Implementation of Compact Branch-Line Coupler Using π Type Quasi-Lumped Elements Approach." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/85434263772604128238.
Full textAbstract:
碩士逢甲大學
資訊電機工程碩士在職專班
95
This essay outlines three kinds of compact-size branch-line couplers and a comparison between compact-size branch-line coupler and traditional branch-line coupler in scale-down size. By using the first novel symmetrical π branch-line coupler, it reduced the area of traditional branch-line coupler up to 67%. By using the second novel non-symmetrical π branch-line coupler, it reduced the area of traditional branch-line coupler up to 66.2%. By using the third novel equal difference pattern branch-line coupler, it reduced the area of traditional branch-line coupler up to 63.8%. The above three novel types of couplers not only have the effect of compact-size in area but have good performance in bandwidth, especially the third novel equal difference pattern, which bandwidth can reach 360 MHz(∠S21 -∠S31 within 90°±1°). The frequency of these three compact-size branch-line couplers is set to 2.4 GHz and the three 2.4 GHz couplers are fabricated on a FR-4 copper clad laminate (εr=4.7;tanδ =0.022; thickness=0.8mm ; metal thickness=0.02mm). Finally, the measurements have been carried out using a network analyzer. From the theoretical investigation it was found that these three compact-size branch-line couplers not only miniaturize in size but also have the merit of single planar and one-time implementation. Additionally, it doesn’t need lumped elements,bonding-wires, and via-holes,especially suitable for use in the application of design of MIC and MMIC.
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Kuo, Yen-Liang, and 郭彥良. "Arbitrary Dual-band Branch-line Coupler Using Composite Right/Left-handed Transmission Lines on LTCC Process." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08407180328033643885.
Full textAbstract:
碩士國立臺灣大學
電信工程學研究所
97
This thesis will realize dual-band branch-line coupler by controlling the phase response of the right/left-handed transmission line (CRLH TL). When realizing the CRLH TL, we will control lumped element''s parasitic by layout to control the phase response of CRLH TL to achieve the desired frequency response of coupler. The design flow of dual-frequency branch coupler using LTCC (low temperature co-Fired ceramic) process will be introduced. The coupler''s coupling frequeies are 2.4GHz and 5.1GHz.
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Chen, Hsuehwu, and 陳學武. "Design of Compact Power Divider with Broad-Band Harmonic Suppression and Unequal Power Dual-Band Branch-Line Coupler." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/50058577481022562888.
Full textAbstract:
碩士國立中正大學
電機工程研究所
100
This thesis included two parts. The first part is design of compact power divider with harmonic suppression, Using T-type model reduce circuit size. Moreover add open stub to generate two transmission zeros for good selectivity and harmonic suppression bandwidth. Finally, the full-wave electromagnetic simulator is utilized as the design assistance. Second part is unequal dual-band branch line coupler, The structure of this dual-band coupler is composed of three coupled lines, according to electric length of coupled lines have four case to discuss, unequal electric length can provide higher frequency ratio, Because the unequal odd-mode and even-mode phase velocity of the coupled line, the inter-digital capacitors at the source and load ports. All circuits in this thesis are simulated with full-wave electromagnetic simulator, and these circuits have been fabricated and measured. The matched results between electromagnetic simulation and measurement can demonstrate the availability of all proposed circuits.
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Wu, Chao-Lin, and 伍昭霖. "Design of the Novel Arbitrary Dual-Band Branch-Line Coupler Applied to Dual-Band Dual-Sense Circularly Polarized Antenna." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/20399620222513048246.
Full textAbstract:
碩士國立交通大學
電信工程研究所
102
A design of the novel dual-band branch-line coupler applied to dual-band dual-sense circularly polarized antenna is presented in this thesis. The resonant frequency of the dual-band branch-line coupler is designed at 2.55 GHz and 3.5 GHz. Different from the conventional branch-line coupler, the concept of composite right left handed transmission line is used in this thesis by inserting open stubs and the lump elements of capacitors and inductors in the branch. In order to have a dual-band circuit, there are exact parameter values which obtained by the steps of even-odd mode analysis method. The circuit can be operated at arbitrary dual-frequency which is decided by designer. It is importance to have the properties of dual-band and producing the condition of circular polarization of the patch antenna. Especially, the novel dual-band branch-line coupler is most important because of equally power amplitude and ninety phase difference between two output ports. Also, the patch antenna is etched four slots and fed by L-shaped capacitive coupling probes so that it can produce circular polarization and more symmetry as same as the branch-line coupler. Finally, the whole configuration is combined with the circuit and the patch antenna to obtain the dual-band dual-sense circularly polarized antenna.
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Летавин, Д. А., and D. A. Letavin. "Миниатюризация микрополосковых СВЧ-устройств : магистерская диссертация." Master's thesis, 2016. http://hdl.handle.net/10995/43198.
Full textAbstract:
Данная работа посвящена миниатюризации квадратурных и кольцевых мостовых устройств. Описана процедура проектирования миниатюрных конструкций, основанная на замене отрезка микрополосковой линии передачи на фильтр нижних частот, обладающий таким же фазовым сдвигом, что и заменяемый отрезок. Проведено моделирование предлагаемых конструкций и получены их частотные характеристики. Изготовлены опытные образцы, и измерены их характеристики, которые подтверждают работоспособность устройства.This work is dedicated to the miniaturization of the quadrature ring and bridge devices. The procedure of designing miniature structures based on replacement of a segment of microstrip transmission line on a low-pass filter, which has the same phase shift that model and cut. The simulation of the proposed designs and obtained their frequency characteristics. Built prototypes of, and measured their characteristics, which confirm the efficiency of the device.
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Chang, Wei-Lun. "Design of Compact Branch-Line Couplers with Coupled Resonators." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2207200803102600.
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Chang, Wei-Lun, and 張維倫. "Design of Compact Branch-Line Couplers with Coupled Resonators." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/47346070225479884685.
Full textAbstract:
碩士國立臺灣大學
電信工程學研究所
96
This thesis presents compact branch-line couplers composed of coupled resonators. The quarter-wavelength transmission lines are equivalent to the couplings between resonators. Therefore, the conventional branch-line coupler can be transformed into a coupled-resonator network. The resultant coupler provides bandpass characteristics. In addition, the size of coupler reduces as the size of resonator shrinks. With miniaturized resonators, the coupler saves 50% of area compared with conventional branch-line coupler. Moreover, this technique can be applied to design dual-band couplers. With stepped-impedance resonators, a dual-band branch-line coupler with bandpass response is achieved.
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Lin, Chien-Tang, and 林堅棠. "Design of Coplanar-Waveguide Branch-Line Couplers." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/94651723551547386653.
Full textAbstract:
碩士國立臺灣大學
電信工程學研究所
88
This thesis is mainly concerned with the study of miniaturizing and broadbanding uniplanar branch-line coupler. The performances of the branch-line couplers are carefully examined, theoretically and experimentally. Branch-line coupler is a key component in microwave circuits, which is composed of fourλ/4 transmission lines and occupies large circuit area. In this study, two types of branch-line couplers are proposed for size reduction. First, by using an impedance inverter to replace theλ/4 transmission line, a reduced-size impedance-inverter type branch-line coupler is proposed. The area of this coupler is reduced to 45% of the conventional one. Alternatively, another reduced-size branch-line coupler with six stubs is also proposed. Here, theλ/4 main line is replaced by the shorter, high-impedance line incorporated with three open stubs. For this coupler, its area is reduced to 35% of the conventional one. Branch-line coupler has limited applications due to its narrow bandwidth. In order to achieve the broadband design, we add matching networks at the four ports individually, also with suitable design for size reduction. The reduced-size broadband branch-line coupler has 22% bandwidth and 1/4 of the conventional one. These proposed reduced-size and broadband designs are suitable for use in uniplanar MIC/MMIC systems.
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Hsiao, Meng-Yu, and 蕭孟宇. "Design of Miniaturized Branch-Line Couplers Using Dispersive Delay Line." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02357439252754132161.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
104
In this thesis, a miniaturized branch-line coupler using dispersive delay line is presented. The dispersive delay line includes shunted open stubs in signal plane and slot-line of the corresponding stubs in ground plane. Transmission zeros of shunted open stubs can be convert to an all-pass response of |S21| by the slot-line of corresponding stubs. By adding the complementary configuration to a reduced branch-line coupler, the phase difference between ports remains the same with the original branch-line coupler. Thus the miniaturized branch-line coupler performs the same characteristic with the conventional branch-line coupler. This thesis presents two different miniaturized branch-line couplers separately at 500 MHz and 1 GHz. Their circuits are both built on the ROGERS RO4003 substrate with substrate thickness of 32 mils, conductor thickness of 35μm, and loss tangent of δ = 0.0027. The miniaturized branch-line coupler at 500 MHz has a size reduction of 59.6%. The miniaturized branch-line coupler at 1 GHz has a size reduction of 48%. The measurement results are in good agreement with the simulations.
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Li, Chien-Hung, and 李健弘. "Studying of Branch-Line Couplers with Unequal Length." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/40455521750135019865.
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LIOU, SHI-RONG, and 劉璽鎔. "Study of Extremely Compact Microstrip Branch-Line Couplers." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/99wem3.
Full textAbstract:
博士逢甲大學
電機與通訊工程博士學位學程
107
The conventional branch-line coupler is consisted of four quarter wavelength transmission lines. Coupler devices are used to divide power and generate phase difference in radio transceivers. Conventional 90° hybrid couplers are implemented in balanced amplifier or mixer circuit design. With advancement in technology, communication systems have rapidly evolved in recent years. Currently, all cost-reduction efforts, including size reduction and low-cost fabrication, are focused on the components of modern wireless communication systems. In the study, the novel compact coupler was designed with equal different structure and folding structure without any implementation of lumped elements, via-holes, and bonding wires. However, the use of unoccupied area of coupler interiors reveals overlap problems. The design equations of the equal difference structure and folding structure were derived, and a compact branch-line coupler was designed and assembled on FR4 substrate with a 900 MHz operating frequency. Additionally, the circuit area of the equal difference structure and folding structure couplers achieves a size reduction of 84.2% and 85.1% compared with that of a conventional coupler at the same operating frequency. The proposed coupler was successfully designed for easy integration with modern wireless communication systems.
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Wong, You-Ying, and 翁又尹. "Design of a Compact Wide-band Branch-line Couplers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/p8b62m.
Full textAbstract:
碩士國立臺北科技大學
電腦與通訊研究所
95
A novel structure for wide-band branch-line couplers is being designed. In this work, we utilized a branch-line coupler with a three-branch hybrid to achieve the broad-band feature. We also used stepped impedance to reduce the size of the coupler. In addition, laddered stubs could be used to increase the bandwidth and balance the output. The proposed coupler featuring utilizly laddered stubs and stepped impedance on a single circuit board case achieves compact size. The requirement since both are distributed elements system which utilizes reduced length for the replacement of traditional microstrip line which acted as equivalent capacitances and inductances. The bandwidth of the coupler with center frequency of 2 to 3GHz has increased by 50% and covered the frequently used bandwidth of 2 to 3GHz. The actual size of the coupler has decreased by 15%.
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Cho, Kuo-cheng, and 卓國程. "Studying of Unequal Power Branch-Line Couplers with Unequal Length." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/34592142544161567729.
Full textAbstract:
碩士逢甲大學
資訊電機工程碩士在職專班
99
Abstract The application of Branch-Line Coupler in communication system field is tremendous as well as it has characteristics of phase variation and power distribution; thus two kinds of unequal power Branch-Line couplers with unequal length are proposed in this article. The first structure is a unequal power Branch-Line couplers with unequal length of 4dB; and the second type is that of a 5dB. Both two types of the unequal power Branch-Line couplers with unequal length as stated above come with characteristics of power distribution. The working band of unequal power Branch-Line couplers with unequal length in design is at 0.9GHz by using FR4 glass fiber double-sided board with designing parameters of (tanδ= 0.022 εr = 4.7 ; metal thickness = 0.02mm ; thickness=0.8mm). Utilizing Sonnet simulator in simulating the circuit and measured by network analyzer, finally compare the data result of the simulated circuit of its S11 vs. S41≦-15dB；the phase variation of S21-S31conforms to 90°± 1°; and if the output power of S21-S31 turns out to have characteristics of unequal power distribution in proportion. In this article, the advantages of two unequal power Branch-Line couplers with unequal length of 4dB and 5dB were found not only have the characteristics of power distribution, but also their linewidth are apparently much wider than that of the 3dB''s that it is able to accomplish the circuit without using lumped element and jumper, which is broadly used in the microwave circuit system.
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Alam, Taukir, and 藍濤. "Design and Implementation of Branch Line Couplers for 5G Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/x4z335.
Full textAbstract:
碩士國立高雄師範大學
工程國際碩士學位學程
106
Branch line coupler (BLC) is an important device which is being used in milli microwave devices, it is used more in communications systems & microwaves systems. The development of these systems has put forward more requirement of dual band circuit. It can used as a single antenna transmitter/receiver system or signal splitter and combiner. With increasing requirement and technological evolution; Need arises so this can operate on high frequencies. In this thesis branch line coupler operating at high frequencies have been designed and implemented. Three kind of coupler has been realized with different positions of stubs. One position is all four stubs put on lower side of TL (transmission line), second coupler has been realized; this has put on the middle of micro strip TL and third one is realized on top of the micro strip. All three couplers fabrication has been done to realize the coupler circuits. For all three couplers frequencies has been selected to 5G (Fifth Generation) 3.45GHz & 4.9GHz. It has been realized and implemented with Advance Design System (ADS), Integral Equation Three Dimensional (IE3D) & Computer Aided Design (CAD).Branch line coupler with four shorted stubs has been designed, because of operating dual frequency is taken 5G, So there is change observe in width & length of stubs. These changes due to high impendence appeared with the using of 5G frequencies. Coupler Circuit has been realized, there is FR4 substrate has been chosen its thickness is 0.8mm & its dielectric constant 4.7, loss tangent is taken 0.014. The circuit has been designed, implemented & verified. The fabricated circuit is matching with simulated result.
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Hsu, Yu-Chen, and 徐宇辰. "A miniaturized approach to the design of branch-line couplers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93626786815713119148.
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Tseng, Yun-Fu, and 曾雲富. "Design and Implementation of SuperCompact Planar Microstripline Branch-Line Couplers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/91457416348344451497.
Full textAbstract:
碩士逢甲大學
產業研發碩士班
95
Three kinds of super compact planar microstripline branch-line couplers were proposed in this study, and made comparisons between compact-size branch-line coupler and conventional branch-line coupler in reduced size. The first novel equal difference structure branch-line coupler occupied only 16.4% of the conventional branch-line coupler, The second novel fold-shape structure branch-line coupler occupied only 15.5% of the conventional branch-line coupler, The third novel bend-shape structure branch-line coupler occupied only 14.6% of the conventional branch-line coupler. The above three novel types of couplers not only have the effect of compact-size in area but have good performance in output-balance, phase difference and bandwidth. The frequency of these three compact-size branch-line couplers is set to 900MHz and the three compact-size couplers are fabricated on the FR4 copper clad substrate ( ; ; thickness=0.8mm; metal thickness= 0.02mm). Finally, the result of measurements have been using for the network analyzer. The result of the study indicate that three compact-size branch-line couplers not merely compact in size but have the merit of single planar and one time implementation. Otherwise, three proposed couplers can be implemented by using the standard printed-circuit-board etching processes without any implementation of lumped elements, bonding wires, and via-holes, making it very useful for wireless communication systems, and it is quite suitable in the MIC’s and MMIC’s application.