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1
Torgersen, Tron. "Wilkinson Power Divider : A Miniaturized MMIC Lumped Component Equivalent." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9853.
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This report will describe the simulation of a Wilkinson Power Divider, realised using lumped components to minimize its size. Every step in the process, from calculating the lumped component values to the final momentum s-parameter simulation is discussed. All relevant theory is described in the theory section. The main goal of this project is to produce the Wilkinson Power Divider using TriQuints 0.5 um TQPED process in as small area as possible. The response of the circuit should also be made as close as possible to the ideal Wilkinson Power Divider. An important additional goal is to learn to use a relevant high-frequency design tool (Agilent ADS) and to get a good understanding of MMIC technology, including the components used and various effects such as cross-talk. During the project a practical measurement on components produced using the TriQuint process will be done, which gives a good understanding of practical measurements using probe station and network analyzer. The final layout, that is arrived at in three steps from a regular Wilkinson Power Divider, should be ready for production, and shows good performance while occupying only a 403 um * 271 um area. The design is thoroughly simulated using Momentum simulation and compared to the ideal response. Any discrepancy between the two responses is explained and commented. All the measurements is compared to simulation results, and deviations between the two is pointed out, and the most probable causes of these are described.
2
Cooper, James Roger. "A Multi-Wilkinson Power Divider Based Complex Reflection Coefficient Detector." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1603.
Full textAbstract:
In the field of applied electromagnetics, there is always a need to create new methods for electrical characterization of materials, systems, devices, etc. Many applications need small and/or inexpensive equipment in performing these characterizations. The current method for making measurements of electrical properties at frequencies above 300 MHz, the transmission/reflection method, has severe limitations in these areas due large size and high price of the necessary equipment for making them. Therefore, presented herein is the conceptualization, design and analysis of a complex reflection coefficient detector which is relatively small, lightweight, and inexpensive.
A reflection coefficient detector is a device designed to isolate and compare a driving signal against a reflected signal. The reflection of the second signal is caused by a mismatch between the device's output impedance and a load's input impedance. By comparing the driving, or transmitted, signal and the reflected signal, the reflection coefficient at the boundary can be calculated. This coefficient can be used to calculate a load's input impedance, or a material's permittivity when combined with an attached probe's characteristics.
The reflection coefficient detector presented is built using microstrip and surface mount components. This makes the device comparably cheap. Its design is based upon five Wilkinson Power Dividers which lends itself to be scaled down for implementation in on-chip, and other micro- and nano- scale systems.
The accuracy and functionality of the device will be demonstrated through the use of S-Parameters measurements and CAD simulations. Through this, it will be shown that the device is a practical form of making measurements in applications which are otherwise restricted to certain limitations. In closing, applications, alternative designs and future advancements of the complex reflection coefficient detector will be discussed.
3
Harty, Daniel D. "Novel Design of a Wideband Ribcage-Dipole Array and its Feeding Network." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/98.
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In this thesis the focus was on the design, fabrication, and tests of the feeding networks individually and within an array system. The array feeding network is a corporate-fed type utilizing equal-split, stepped-multiple sections of the conventional Wilkinson power divider in microstrip form with a unique topology. The feeding network was specifically designed for a broadside relatively small linearly-polarized wideband UHF non-scanning array for directed power applications that uses an array radiator with a new volumetric ribcage dipole configuration. The array has a large impedance bandwidth and consistent front lobe gain over the wide frequency band. Theoretical and experimental results describing the performance of the array feeding network and the array are presented and discussed.
4
Ali, Ammar H. A. "Design and Implementation of Radio Frequency Power Feeding Networks for Antenna Array Applications: Simulation and Measurements of Multiport, Equal and Unequal, Fixed and Reconfigurable Radio Frequency Power Feeding Networks for Narrow and Ultra-Wideband Applications." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17447.
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Power dividers are vital components and widely used in radio technology, such
as antenna arrays, power amplifiers, multiplexers and mixers. A good example is
the well-known Wilkinson power divider with its distinctive feeding network
characteristics. A comprehensive review indicated that limited research is carried
out in the area of planar multiport and reconfigurable power dividers in terms of
the power levels between output ports.
The main objectives of this work were to develop a small size power divider, a
planer multi-output ports power divider and a power divider with a reconfigurable
power division ratio. These power dividers were designed to operate over either
an ultra-wideband frequency (3.1-10.6 GHz) or WLAN bands (2.4 or 5.2 GHz).
A novel multi-layered topology solved the complexity of interconnecting isolation
resistors by introducing an additional layer below the ground layer. The prototype
was fabricated and tested to validate the results. The measurements and
simulation were in good agreement.
Finally, a novel uniplanar power divider with reconfigurable output power level
difference was developed. The configurability feature was achieved by tuning the
quarter wave transformer using one varactor diode. The power divider was
applied to improve a full duplex system cancellation performance at the receiver
element caused by interference from in-site transmitting antennas.
This study investigated fixed power dividers, multi-output power dividers and
reconfigurable power dividers. The measurements validated by the simulation
results and applications proved the designed power dividers could be used in
practical applications.Higher Committee for Education Development (HCED), Iraq
5
Šustr, Jan. "Mikrovlnný transvertor z 5 760 MHz na 146 MHz." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219089.
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This work deals with a design of the microwave transverter for 5 760 MHz to 146 MHz. It is divided to a few parts. The first one is focused to design of the local oscillator which generates the signal at frequency f = 116.9583MHz. The oscillator is designed like a crystal oscillator. Its output signal is multiplied and amplified in a second part. The next parts deal with design of the band pass filters. There I chose the design of the filters and did the measurements. The microwave receiver and transmitter circuits are designed with the modern monolithic circuits. The main job of this part is to design low noise amplifier and the power amplifier. At the end of this work I do the measurements and the comparison with the simulations.
6
Katakam, Sri. "Design of Multi Band Microwave Devices Using Coupled Line Transmission Lines." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801903/.
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Multi band technology helps in getting multiple operating frequencies using a single microwave device. This thesis presents the design of dual and tri band microwave devices using coupled transmission line structures. Chapter 2 presents the design of a novel dual band transmission line structure using coupled lines. In chapter 3, Design of a dual band branch line coupler and a dual band Wilkinson power divider are proposed using the novel dual band transmission line structure presented in the previous chapter. In chapter 4, Design of a tri band transmission line structure by extending the dual band structure is presented. The Conclusion and future work are presented in chapter 5.
7
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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Bartoš, Adam. "Anténní systém pro bezdrátové mikrofony." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376997.
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Master's thesis deals with the design of an antenna system for wireless sound transmission used mainly in professional sound reinforcement. The introductory part deals generally with wireless microphones, frequency bands used and proven antenna types. Next, this work deals with signal distribution that is realized using the antenna splitter. The antenna parts is focused on easy production and real usage, therefore were selected antennas with appropriate properties suitable for small series production. This thesis includes simulation of each device, their real construction design and measurements of built prototypes and final products. All three produced devices – the rack splitter, /4 antenna and Helix antenna are fully working, achieve good parameters and are ready for further manufacturing and easy modifications in case of frequency band change requirement. The conclusion includes an overall assessment of the results achieved.
9
Bucossi, William Louis. "Process voltage temperature compensated on-chip CMOS active inductors for Wilkinson power dividing applications." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/bucossi/BucossiW0508.pdf.
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Few academic or industry feasibility studies have been published on the implementation of Active Inductors in a standard CMOS IC process as an alternative to the physically large and typically quite lossy spiral inductors. Development efforts at the simulation level have achieved only limited success in creating an Active Inductor topology that exhibits the quality and inductive tolerance necessary for the large-scale, high-volume production common to most IC components. This thesis focuses on manufacturing and characterizing the basic component circuitry necessary for the implementation of a lumped-element Wilkinson power divider using active inductors and develops a compensation scheme to control the parameters of merit in the active inductor across a useful process, voltage and temperature operating window. Hardware results presented reinforce the need to actively compensate the Active Inductor structure implemented in a 0.6um (AMIS C5) CMOS process. Simulation results presented show the benefits of a compensated Active Inductor incorporated into a typical RF network.
10
Špatenka, Vojtěch. "Širokopásmové planární antény." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219837.
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In this master´s thesis an issue of broadband planar antennas was analyzed. Firstly, the basic elements that affect bandwidth, such as the influence of the dieletric substrate, suitable shape or feeding network, were described. Furthermore technics that can be used to widen the band of the planar antennas were described. These technics were applied to a chosen type of a planar antenna. This antenna was modeled and simulated for desired dielectric substrate in CST STUDIO SUITE 2010 software. Feeding network with power dividers was designed for the antenna array. In order to obtain a higher gain, the antenna was implemented into the 2x2 element array. The results of the simulation are evaluated in the conclusion.
11
Chau, Wei-ming, and 周煒明. "Filter-Based Wilkinson Power Divider." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/76750657945196043428.
Full textAbstract:
碩士國立中央大學
電機工程學系
102
A wide-stopband Wilkinson power divider with bandpass response is proposed. A 3-terminal, 2-pole bandpass filter and two lowpass filters are used to replace two quarter-wavelength transformer in the conventional Wilkinson power divider. By employing shorted-circuited half-wavelength resonator, the two output signals are of the same magnitude and phase. The two output paths share a bandpass filter. Hence, only one 3-terminal bandpass filter is used for power division. In this way, the circuit size could be further reduced. One can simply utilize two 70.7 Ω delay lines with proper length and an isolation resistor to finish the design. However, the divider also utilizes microstrip elliptic-function lowpass filters. With negligible insertion loss in the passband, these lowpass filters not only generate wide stopband but also provide phase delay to shorten the two delay lines. The proposed divider features not only bandpass response but also a very wide stopband. For the upper stopband performance, the rejection level is greater than 20 dB up to 22.2f0. The design concept mention above can also be extended to realize a filter-based Wilkinson power divider in order to improve the selectivity and stopband rejection. For the upper stopband performance, the rejection level is greater than 30 dB up to 22.2f0. Stepped-impedance resonators with diodes loaded at two outputs are used to develop switchable power divider in this thesis. The p-i-n loaded diodes are used to independently control the channel of the divider. The 20-dB stopband extends up to 22.2 f0. Experiments are carried out to validate design concept of the proposed power divider.
12
Wang, Sheng-huei, and 王勝暉. "Study of Miniaturization Wilkinson Power Divider." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/17844874676932439415.
Full textAbstract:
碩士逢甲大學
產業研發碩士班
95
With the increasing data transfer demands on wireless communication, the issues of the low-cost and high-level integration are the current for the implementation of communication system. With CMOS technology is showing the potential to meet these requirements. Due to the use of transmission line (TL), it is not practical to integrate the microwave power dividers monolithically. Though the miniaturized chip size can be achieved, they still suffer from the use a huge chip area and increasing prime cost. Therefore, the lumped-element replacement has been proposed to reduce the chip size. The bandwidth not enough is a problem, that organize component to from equivalent-elements. In this thesis, Complementary-Conducting-Strip (CCS) TLs are employed to substitute the microstrip lines, use meandered and wound to compact layout, provide microstrip lines performance and miniaturization chip area. Based on this concept, the Wilkinson power divider (WPD) is implemented in the standard 0.18 μm CMOS process for monolithic microwave integrated circuit (MMIC) applications, the CCS equivalent model to design and analysis. By employing CCS TLs in the synthetic transmission line architecture, the WPD exhibits a wide impedance control range, compact layout and miniaturization chip area. To extract CCS unit cell parameter from the 10 x 10 CCS meander line, to simulation about to WPD from cascaded CCS unit cell. Characterized by the S-parameter simulation, the circuit demonstrates a coupling loss less than -5.51 dB and a return loss better than -13 dB with power divider at the center frequency of 11 GHz while maintaining isolation better than -15 dB from 9.3 GHz to 16.1 GHz. The occupying area of the miniaturization WPD, not including the input/output (I/O) PADs area, is 405 μm x 330 μm. For the design of a rather compact WPD is implemented using CMOS 0.18 μm process. The fabricated circuit exhibits a coupling loss less than -4.89 dB and a return loss better than -15 dB at the center frequency of 11 GHz while maintaining good isolation between the output ports. The occupying area of the miniaturized WPD, not including the I/O PADs area, is 345 μm x 360 μm, which is suitable for the system in MMIC applications. In this thesis, a miniaturization WPD for 11 GHz is proposed. In the first half of this thesis, theory of WPD and configurations of the CCS are described. With a compact WPD base on commercial CMOS 0.18 μm process technology is implemented and measured.
13
Chen, Yi-Fan, and 陳奕帆. "Design of Unequal Split Wilkinson Power Divider." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/19710646023846970003.
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郭宗信. "Simulation and Analysis of Wilkinson Power Divider for 802.11a Application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/53708886150927188863.
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碩士明新科技大學
電子工程研究所
97
The Printed Circuit Board (PCB) panel is popularly used to develop products in the electronic industry. Because the material of PCB is not the ideal material, the characteristic of PCB will be different with changing of operating frequency. The PCB characteristics are more stable under the low operating frequency than under the high operating frequency. Therefore, a lot of circuit designs and applications at high frequency are often unable to achieve the anticipated results. In this article, Wilkinson Power Divider is realized using the Print Circuit Board (PCB) of Flame Retardant 4 (FR-4) material and can be applied to 802.11a. Software is used to understand the error of results between the simulation and the realized circuit. The centre frequency of power divider can be adjusted by changing the length of microstrip line. It can be seen that the shorter strip line can shorten the wavelength and adjust the centre frequency. When the wavelength is relatively short, it can obtain lower insertion loss and make the FR-4 PCB keeping more stable characteristics in 802.11a operating frequency. In this study, a transmission line Wilkinson Power Divider is designed to reach the same function of Power Divider IC and achieve the lower cost design. The lower cost design can increase the competition of the product. The increase of the development cost will cause the reducing of the product profit in the era of meager profit. If designers can assess the whole cost and adopt the lower cost design to reach same quality as the original product design, they can not only increase the competitive advantage of the product but also promote self-designed ability.
15
Huang, Wei-Chien, and 黃偉鈐. "Design of Miniaturized Wilkinson Power Divider Using Dispersive Delay Line." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/37681445297775833467.
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碩士國立臺灣科技大學
電子工程系
104
In this thesis, the miniaturized Wilkinson Power Divider is presented by using the technology of DDL(Dispersive Delay Line). The DDL consists of a symmetrical open stub and its non-coplanar complementary slot line. The advantage of the method is reducing the substrate area and obtaining the same all-pass result as possible.
16
Chiang, Chien-Yu, and 江建佑. "Design of Miniaturized Wilkinson Power Divider Using Multilayer Inductors in LTCC." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/22789592341854415970.
Full textAbstract:
碩士華梵大學
電子工程學系碩士班
98
This dissertation will introduce the advantage of multilayer inductors wound edge by the technique of low temperature cofired ceramic (LTCC), and will propose two design layout of miniaturized Wilkinson power divider. The application of this technology and layout can significantly reduce the use of space, and can become a possible alternative of Wilkinson power divider layout which settled by high-impedance transmission line. Following this, this paper will simulate the experiment in units of nano environment to see whether the formula and full-wave electromagnetic simulation software (HFSS) are correct. In addition, in order to reach the same power allocation and good isolation, the experiment uses symmetrical structure which uses isolating resistor to divide two output port. Also, the experiment uses the technique of (Sonnet) and (ADS) to design Equivalent circuit. All of these are aiming to see the result of the testing. In the meanwhile, the standard of the component design specifications is 2.0mm x 1.2mm x 0.6mm , and the center frequency is expected to achieve 900MHz .Today, the technique of LTCC multi-layer winding inductor is quite mature, and therefore this kind of alternative is highly likely to be implemented. Also, it is expected that the miniaturized Wilkinson power divider can be designed by maintaining its original features under some conditions. In other words, multilayer inductors wound edge can design both of multi-winding inductance and capacitance at the same time, and can ensure the establishment of inductor as well as the capacitance value.
17
HSU, PO-YEN, and 徐柏硯. "A Band-Extended Wilkinson Power Divider Based on Modified Tapered Line." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/bk54f8.
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碩士國立臺北大學
通訊工程研究所
105
In this study, we seek to discover a microstrip line approach to implement tapered lines for microwave passive circuit design. From the theory of tapered lines we can only determine the relationship between continuous tapered impedance and length, yet from the given knowledge we cannot realize the actual microstrip line width relation between the given theories. Thus we developed ways to implement tapered lines in microstrip line design, in this research we used a center frequency of 1GHz to design a width taper and Defected Ground Structure based taper. Subsequently we developed two methods to approximate an actual exponential tapered line since theoretical exponential tapered lines are impractical to implement with common used layout software’s. The center frequency in this design is set at 500MHz. In the last chapter, we choose to use the stepped width exponential tapered line as bases and replace the quarter lambda section of the conventional Wilkinson power divider with stepped width exponential tapered lines in order to achieve a wideband Wilkinson power divider. The measured -15dB bandwidth of the modified Wilkinson power divider has a widen bandwidth from 486MHz to 2GHz, which is 3 times wider than a conventional Wilkinson power divider (-15 dB bandwidth from 340MHz to 680MHz).
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Chen, Jia-Wei, and 陳佳緯. "Design and Study of Wideband Harmonic-Suppression and Miniature Wilkinson Power Divider." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/45662706699492593413.
Full textAbstract:
碩士逢甲大學
電機工程學系
104
The aim of this dissertation is to investigate and study in the method designing for Wilkinson power divider (WPD) of microwave passive circuit miniaturization and harmonic suppression. By utilizing the design with extended lines, open stubs and open double-transmission-line stub (ODTLS) structure, combining with complementary-conducting-strip (CCS) transmission line (TL), and using printed circuit board (PCB) manufacturing process to achieve wideband harmonic suppression and WPD miniaturization. In the PCB manufacturing process, because the width of low-impedance open stub line is wider and has difficulties in achieving compact layout, the method in this thesis was suggested to be designed to replace open stubs with ODTLS. By doing parameters analyses of ODTLS, this method is designed to use CCS transmission line instead of the ideal transmission line circuit model which is conformed to Electrical specifications, and then to be performed simulation, implemented, measured and verified. This study utilizes three-dimensional (3-D) electromagnetic (EM) full-wave (FW) finite element method (FEM) to simulate and analyze, and uses the PCB manufacturing process from JetPCB Co. to make the prototype of this WPD, and measure it by vector network analyzer.. From the measurement results, input return loss (|S11|) at center frequency of proposed WPD is 39.29 dB, the insertion losses (|S21|, |S31|) are 3.1 dB and 3.3 dB, output return losses (|S22|, |S33|) and isolation (|S23|) are 20.9 dB, 20.3 dB and 19.8 dB, respectively. When input return loss is better than 20 dB, output return losses and isolation are better than 15 dB, the bandwidth is 0.86 – 1.13 GHz, which achieve 27.1% of fractional bandwidth. In this band, insertion losses (|S21|, |S31|) are 3.15 ± 0.05 dB and 3.28 ± 0.06 dB, respectively, phase difference (∠S21-∠S31) is 2.62 ± 0.85º . On the condition of 20-dB harmonic suppression level, the harmonic suppression bandwidth of insertion losses (|S21|, |S31|) are 2.29 GHz (1.88 - 4.17 GHz) and 2.68 GHz (1.81 – 4.49 GHz), respectively. It shows satisfying performance of wideband harmonic suppression in 2f0 - 4f0 band. Compared with conventional ring microstrip WPD ("π"×〖("17 mm" )〗^"2" ≅907.92 mm2 at 1-GHz), the occupying area of proposed CCS WPD (I/O PADs excluded) is 261.63 mm2 (15.3 mm × 17.1 mm). Therefore, it achieved 71.18% of the area reduction factor (ARF), and it indicates that the method is effective in miniaturizing.
19
CHANG, YEN-WEI, and 張彥崴. "Truly Radial N-Way Wilkinson Power Divider with Defected Ground Structure Transmission Line." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7c46y6.
Full textAbstract:
碩士國立臺北大學
通訊工程研究所
105
In this paper, we study the development of Radial 8-way Wilkinson Power Divider and (1: 4 Modified Wilkinson Power Divider). It is mainly designed at 1 GHz. The main function of this 1: N Wilkinson power divider is used to add or distribute a high number of receivers or transmitters in the radio frequency band. Therefore, the RF power dividers occupies a very important circuit block in a large-scale multi-input multi-output system. And this paper presents a radial 1: 4 and 1: 8 Wilkinson power divider compared to the traditional Wilkinson power divider, in addition to the all ports matched, energy symmetrical equalization, with isolation between output ports, also achieved the advantage of reducing the circuit area by 40%. The purpose of this paper is to present the truly radial 1: 8 Wilkinson power divider and 1: 4 modified Wilkinson Power Divider. The truly radial 1: 8 Wilkinson power divider research method is divided into two parts. Part I: According to the theoretical analysis of Wilkinson Power Divider, the impedance of the isolation resistance must be only the real part of the pure resistance, there can not be part of the imaginary part. However, when the 1: 8 Wilkinson coupler is designed to be radial, there must be a connected transmission line between the isolation resistors, and the transmission line effect based on the microwave theory is bound to produce the imaginary part impedance. One possible way is to replace the transmission line connecting the isolation resistor with the L-C-L filter. The use of LC resonance characteristics to achieve the impedance isolation resistance only real part of isolation resistance, and inductor L using a high impedance transmission line instead of increasing the design flexibility. Part II: In the case of the 8 Way Wilkinson Power Divider, the quarter-length transmission line width is only 0.16mm, in order to increase the feasibility of the implementation, in this will be the quarter-wavelength of the transmission line using Defected Ground Structure with Tapered Lines design to replace the original transmission line. And 1: 4 modified Wilkinson Power Divider design is to each quarter wavelength transmission line designed to L-type, the purpose is to reduce the overall circuit area, so that the two output ports connected to the end of the isolation transmission line can effectively shorten the length of transmission line, and then used the three-dimensional circuit architecture analysis to improve the radial Wilkinson power divider. These two kinds of Truly Radial 8-way Wilkinson Power Dividers and 4-Way modified Wilkinson Power Dividers can be used in large-scale multi-input multi-output systems, so that without increasing the individual transmission speed, increase the number of parallel wireless communication users, while reducing the 40% circuit area.
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Ali, Ammar H., Raed A. Abd-Alhameed, Yim Fun Hu, and Mark B. Child. "A design procedure for a 1-to-4 Ultra-Wideband Wilkinson power divider." 2016. http://hdl.handle.net/10454/12053.
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NoThe design of a physically small, equal phase and equal power, 1-to-4 ultra-wideband Wilkinson power divider is presented. Initially, a 1-to-2 divider was designed and optimized for the 3.1 GHz-to-10.6 GHz range. The 1-to-4 divider was then realized using three 1-to-2 dividers, and further optimized for full band insertion loss, return loss, and isolation. The circuits were constructed using a 0.75 mm thick Rogers RO3035 substrate, and experimentally validated.
21
LIN, JIA-HUI, and 林家暉. "Design and Study of Improved Wideband Harmonic-Suppression and Miniature Wilkinson Power Divider." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/62478139406612295272.
Full textAbstract:
碩士逢甲大學
電機工程學系
105
The aim of this dissertation is to improve the design of the wideband harmonic suppression and miniaturization for the Wilkinson power divider (WPD). By utilizing the design with open stubs, extended lines, open dual-transmission line stub (ODTLS), L-type artificial low-pass transmission line (L-type ALPTL), and other components of the module to construct this wideband harmonic suppression Wilkinson power divider circuit. Finally, the complementary-conducting-strip (CCS) transmission line architecture is used to implement the components of the module, and the overall circuit of the packaging layout design. In this research, the substrate material is RO4003CTM, with the dielectric constant of 3.55 and substrate thickness of 0.508 mm. The CCS synthetic waveguide structure is adopted. The periodicity P of CCS unit cell equals to 900 μm, and the three dimension (3D) electromagnetic EM Full-Wave simulator (Ansoft HFSSTM) to analyze its guiding properties and electrical performance. Finally, the general commercial printed circuit board (PCB) process to realize the proposed WPD prototype circuit. According to the results of the measurement, the percentage bandwidth of the power divider is satisfied at the same time: return loss (| S11 |, | S22 |, | S33 |) ≥ 20 dB, isolation (| S32 |) ≥ 20 dB, the fractional bandwidth is 31.1% (0.73 - 1.01 GHz) and its insertion loss (| S21 |, | S31 |) are 3.36 ± 0.05 dB and 3.45 ± 0.07 dB, suppression bandwidth up to 18.23 GHz (1.77-20 GHz) and 18.2 GHz (1.8-20 GHz), including the twenty-two harmonic suppression (2fo - 22.2fo), the phase difference (∠S21 - ∠S31) is within 0.28 ˚ ± 0.1 ˚. The simulated and measured results are consistent with the electrical performance requirements of the relevant design. The occupying area (not including the feed network) of the proposed WPD circuit is only 370.3 mm2 (15.3 mm × 24.2 mm), that compares to the traditional ring-shaped microstrip line WPD circuit, the occupying area of 1134.1 mm2 ("π"×〖("19 mm" )〗^"2" ), the area reduction factor (ARF) is 67.4%, and the effectiveness of miniaturization is superior.
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Kuo, Wen-chi, and 郭文奇. "NEW STRUCTURE WILKINSON POWER DIVIDER BASED ON STEPPED-IMPEDANCE TRANSMISSION LINE AND CAPACITIVE LOAD." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/06896523829844052801.
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碩士國立高雄大學
電機工程學系碩士班
99
A new Wilkinson power divider utilizing stepped impedance transmission lines and capacitive loads is presented. In this design, the capacitive loads are shunted near two output ports and can be implemented easily by two open stubs; as a result, the usage of lumped capacitors, which may cause some unexpected discontinuity, can therefore be avoided. Based on this structure, a small circuit area and high isolation between two output ports can be achieved at the same time. Furthermore, the proposed divider is a slow wave structure capable of pushing the first harmonic to a higher frequency, meaning that the non-operating band responses can also be improved. In this study, the design equations of equal and unequal power ratio dividers have been derived for designing the proposed power dividers. Besides, the implemented circuit layouts also show that the sizes thereof are smaller than that of the conventional Wilkinson power divider.
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Chang, Yao-Chun, and 張耀俊. "A Dualband Wilkinson Power Divider and 5.2GHz Enhanced Linearity Power Amplifier with Build-in Linearizer Circuit Design." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/64333326498854576399.
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碩士長庚大學
電子工程研究所
96
In this thesis, a build-in linearizer was used to improve the linearity of power amplifier by using a 0.15μm AlGaAs/InGaAs D-mode pHEMT process. The implementation is based on a cascade architecture that combined a class A and class AB circuitry for 5.2GHz WLAN application. In Chapter 2, that presents a dual-band Wilkinson power divider operating at two different frequencies by two sections transmission line with different characteristic impedance and parallel connection of a resistor, an inductor, a capacitor. The simulation result shows the return loss is -18.982 dB, insertion loss is -3.365 dB, isolation is -21.368 dB for 2.3GHz and the return loss is -28.274 dB, insertion loss is -3.765 dB isolation is -25.913 dB for 5.8GHz. In Chapter 3, that presented the basic circuitry topology and used the technology to design a linearity of power amplifier with build-in linearizer. The simulation result exhibits the power gain of 22.766 dB with an output power of 23.548 dBm, gain (S21) of 26.375 dB and power-added efficiency (PAE) is 30.565%.
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Chen, Chih Hao, and 陳志豪. "Design and Implementation of 2.4 GHz Class AB Power Amplifier and Wilkinson Power Divider for Wide Band." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/a3v626.
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Jiang, Ming-Jyun, and 姜名駿. "A Study of Linear Retro-Beam Scanning Array System and On-Chip Dual-band Wilkinson Power Divider." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/t4k8x9.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
107
This thesis consists of two independent researches. In the first part, a linear retro-beam scanning system, capable of estimating the direction of arrival (DOA) and retransmitting the signal to a desired direction, is proposed and demonstrated. Studying the governing equations of the retrodirective array (RDA) reveals a possibility of steering the retransmitting signal from original direction (incident angle in the conventional RDA design) by introducing extra phase shifters between the receiving and transmitting paths. To do so, a simple DOA module is designed to trace out the incident angle while the required phase shift sourced by phase shifters will be automatically calculated by Arduino microcontroller as long as the desired retransmitting direction is pre-determined. To validate the design concept, the proposed system was constructed and test; the measured results illustrate that the proposed system can function as a relay unit to retransmit signals to an arbitrary direction with an acceptable scanning range from -30o to +30o. Secondly, a 28/60 GHz dual-band power divider aiming at mm-wave applications has been designed and validated on GaAs integrated passive device (IPD) process. The design concept is based on the unique response of the composite right/left handed transmission line (CRLH-TL) to control the second operating frequency of the Wilkinson power divider. Referring from the measured results, the proposed power divider not only shows the good in-band responses at both operating frequencies but also occupies a very compact footprint when compared to other studies in the open literature. It is believed to be the first on-chip dual-band power divider at mm-wave frequencies.
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Petropoulos, Ioannis, Konstantinos N. Voudouris, Raed A. Abd-Alhameed, and Steven M. R. Jones. "Beam-forming module for backhaul link in a Relay-aided 4G network." 2015. http://hdl.handle.net/10454/7882.
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YesA novel beam-forming module based on Wilkinson power divider technology, including attenuators and phase shifter chips is designed, fabricated and evaluated to be incorporated in a Relay Station connecting it with the Base Station under a 4G network. The proposed module is a 1:8 port circuit, utilizing two substrates, providing approximately 700 MHz bandwidth over 3.5 GHz frequency band and less than −20 dB transmission line coupling. Moreover an external control unit that feeds the beam-forming module with code-words that define the proper amplitude/phase of the excitation currents is established and described. The presented module is connected to a planar array and tested for two beam-forming scenarios, providing satisfactory radiation patterns.
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Rocha, Paulo R. F. "Design and implementation of microstrip filters for a radio over fiber network demonstrator." Master's thesis, 2010. http://hdl.handle.net/10400.1/1723.
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Dissertação de mest., Engenharia Eléctrica e Telecomunicações, Faculdade de Ciências e Tecnologia, Univ. do Algarve, 2010The need for networks able of integrating services such as voice, video, data and mobility is growing. To satisfy such needs wireless networks with a high data transmission capacity are required. An efficient solution for these broadband wireless networks is to transmit radio signals to the Base Stations (BS) via optical fiber using Wavelength Division Multiplexing (WDM). The WDM usage helps this growing, allowing the use of a single optical fiber to feed several BSs using for each one a different wavelength (or WDM channel). Additionally, in the RoFnet project in order to improve radio coverage within a cell, it is considered a sectorized antenna interface. The combination of subcarrier multiplexing (SCM) with WDM, further simplifies the network architecture, by using a specific wavelength channel to feed an individual BS and different subcarriers to drive the individual antenna sectors within the BS. This dissertation reports the design and simulation of the microstrip bandpass filters used at the BS on of the RoFnet demonstrator. These bandpass filters are used for the filtering of fours subcarrier multiplexed channels located at (9, 11, 13, 15 and 17 GHz). The design and simulation of the lowpass root raised cosine filter required for testing is also discussed. Additionally, the design and testing of two power splitter is reported. Finally, all the designed components were brought together and the overall BS performance is assessed. The microstrip components have been designed and simulated using both ADS (Agilent’s Advanced Design System) and Momentum simulators.
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Yeh, Chia-Heng, and 葉家亨. "Isolation Analysis of Filtering Wilkinson Power Dividers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/w2c5du.
Full textAbstract:
碩士國立交通大學
電信工程研究所
102
A method to find the isolation resistances of a filtering power divider is proposed. By introducing the ABCD matrix and even-odd-mode analysis, a nonlinear simultaneous function for calculating of the resistors values for an equi-ripple isolation response is obtained. First, for simplicity, a conventional multi-stage Wilkinson power divider is studied. Then, for narrowband filtering power divider, a short-end parallel coupled filter is proposed and designed by the approximation designing method. In comparison with narrow band filtering power divider, a broadband filtering power divider is proposed and designed by the S-plane synthesis method. Finally, due to the equivalent circuit of a short-end coupling section inherently involving an ideal phase inverter, a filtering balun can be easily adopted from the proposed broadband filtering power divider. The proposed method to obtain the isolation resistors values will be used in all of the four cases.
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Chen, Hsin-Hao, and 陳信豪. "Various Applications and Designs for Wilkinson Power Dividers." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/72278098664971610089.
Full textAbstract:
碩士國立高雄大學
電機工程學系碩士班
99
In this thesis, Wilkinson power dividers are presented for multi-band, wide band, and harmonic suppression applications. Firstly, combining the nonlinear dispersion relation in electromagnetic band gap (EBG) structure and the inherent multiband characteristic of a conventional Wilkinson power divider, a dual-band Wilkinson power divider is proposed. Secondly, a dual-band Wilkinson power divider utilizing all-pass coupled lines section is designed and fabricated. By cascading two coupled lines, a wideband Wilkinson power divider is realized for ultra-wideband applications. Finally, by incorporating a resonator composed of a coupled line and an inductor, a compact Wilkinson power divider is presented for harmonic suppression. Both the simulated and measured data show that the proposed circuits have good matching and isolation characteristics.
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Kang, Da, and 康達. "Wilkinson Power Dividers with Coupled Lines for Harmonic Suppression." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/96djha.
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碩士國立高雄大學
電機工程學系碩士班
100
In this thesis, the main study focuses on using a variety of coupled lines to achieve the miniaturization and harmonic suppression in Wilkinson power dividers. Firstly, the characteristics of a parallel coupled line are discussed, and the fundamentals of a traditional Wilkinson power divider are also introduced. Secondly, a Wilkinson power divider consisting of two section parallel coupled lines is proposed. The electrical lengths of the cascading coupled lines are 财/6 and 财/8, respectively, to suppress the second and third harmonics. Finally, a Wilkinson power divider utilizing a parallel coupled line and an open stub is presented. The electrical lengths of the parallel coupled line and the open stub are carefully designed to produce two transmission zeros at the second and third harmonic frequencies, respectively, for the harmonic suppression. In addition, 27% length reduction is achieved. For the proposed power dividers consisting of coupled lines in this thesis, measurement data are presented and shows a good consistency with the full-wave simulation results.
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Chen, Yu-Ta, and 陳昱達. "New Wilkinson Power Dividers Using Capacitive and Inductive Components." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/31264997090068900773.
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碩士國立高雄大學
電機工程學系碩士班
101
This thesis proposes a new microstrip equal split Wilkinson power divider composed of a series capacitor, a shunt inductor, two transmission-line sections, and two quarter-wavelength (λ/4) impedance transformers. To get out-of-phase at two output ports, one of the λ/4 impedance transformers can be replaced by a short-end coupled-line section. In microstrip line, shunt inductor is usually needed via hole to realize it, but its value can not be predicted easily. Besides, each of the two λ/4 impedance transformers usually needs to design as high characteristic impedance value and therefore the line width is too narrow to implement in microstrip form. To relax the restrictions of the via hole and high characteristic impedance line in microstrip form, this study also design the proposed divider in CPW(Coplanar Waveguide) and CPWG(Coplanar Waveguide with Ground).
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Liu, Ren-chuan, and 劉人權. "Wilkinson Power Dividers Using Stepped-Impedance and Hybrid-Inductive Transmission Lines." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/07112875716009543925.
Full textAbstract:
碩士國立高雄大學
電機工程學系碩士班
102
Conventional Wilkinson power divider is composed of two quarter-wavelength transmission-line and an isolation resistor. Because it usually needs large circuit area, this thesis proposes modified Wilkinson power dividers using stepped-impedance and hybrid-inductive transmission lines to reduce the circuit sizes. To improve the stopband response of the Conventional Wilkinson power divider, this study also integrated π-type transmission line in the proposed dividers to create extra transmission zeros for achieving favorable stopband rejection around the desired frequencies. Besides, hybrid T-type and π-type transmission lines are also included in the presented design for obtaining new dividers.
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Lin, Ching-Chieh, and 林慶杰. "Miniaturization of transmission line with arbitrary length and its applications to compact Wilkinson power dividers." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5bcn63.
Full textAbstract:
碩士國立高雄第一科技大學
電子工程系碩士班
105
A design of miniaturization of transmission line with arbitrary length in this article. And, it apply to Wilkinson power dividers. Wilkinson power dividers are widely used to split the power in many communication systems due to the low insertion loss and greatly high isolation between the two output ports [1].The quarter wave-wavelength transmission lines are necessary parts of traditional Wilkinson power dividers, but they also occupy the large circuit area. This thesis is presented a method by means of replacing quarter-wavelength transmission line by the T-network transmission line. According to reference [2], the spur line’s matrix can be listed. And, let the T-network transmission line equivalent to the spur line. The structure is composed of four sets of spur lines and open-ended stubs. The open-ended stub can modify it into a transmission line with the same feature but with different type. A compact power divider that occupies 95% area of that a traditional power divider is designed. Based on a 15 dB return-loss criterion, the measured FBW is 54.57%. At 1.0 GHz, the insertion losses are -3.38 dB, the input return loss is -27.65 dB and the isolation is lower than -25 dB. The main advantages of this miniaturized technique are its compact size, simple design procedure, low cost and not complex circuit layout.