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Journal articles on the topic 'Fractional bandwidth (FBW)'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Jang, Youna, Cha Hye Seong, Taehoon Kang, Sang-Min Han, and Dal Ahn. "A New Doherty Combiner with Wide Bandwidth for Magnitude and Phase Balance Compensation." Journal of Electromagnetic Engineering and Science 23, no. 4 (2023): 355–61. http://dx.doi.org/10.26866/jees.2023.4.r.178.

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This paper proposes a novel Doherty combiner that uses a series and parallel resonant circuit for wideband. Unlike conventional combiners, the aim of the proposed combiners is to extend bandwidth for not only the magnitude bandwidth, but also phase balance by employing series and parallel resonant circuits at the output impedance of the peaking amplifier. Considering the load impedance of the peaking amplifier, the Doherty combiners were analyzed in the theory of this study by deriving the series and parallel resonant circuit values. The output phase balances are determined for the targeted ba

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2

Sowjanya, A., and D. Vakula. "Design of C band Bandpass Filter using Fractal based Symmetrical Ring Resonator." Advanced Electromagnetics 11, no. 3 (2022): 71–77. http://dx.doi.org/10.7716/aem.v11i3.1851.

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Symmetrical ring resonator metamaterial along with fractal boundary is proposed for Band Pass Filter (BPF) design in this paper. A combination of symmetrical ring resonators and vias is used for designing a bandpass filter. Bandpass filter with low insertion loss, better fractional bandwidth even at higher frequencies is achieved by using moore fractal applied symmetrical ring metamaterial resonators along the microstrip transmission line. The operating frequency range of the simulated filter is in the C-band between 5.47 GHz - 6 GHz having fractional bandwidth (FBW) of 9.25% and with a minimu

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3

Wu, Gangxiong, Hao Wu, Wei Qin, et al. "Design of a Switchable Filter for Reflectionless-Bandpass-to-Reflectionless-Bandstop Responses." Micromachines 14, no. 2 (2023): 424. http://dx.doi.org/10.3390/mi14020424.

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In this paper, a switchable filter based on the microstrip line (ML) with reflectionless-bandpass-to-reflectionless-bandstop responses is designed, theoretically validated, and fabricated. This single-port reflectionless bandpass filter (R-BPF) consists of a BPF and a shunt-connected bandstop section with terminated absorption resistors. The single-port reflectionless bandstop filter (R-BSF) is made of a BSF and a parallel bandpass circuit with terminated absorption resistors. These two reflectionless operational modes, namely R-BPF and R-BSF, are allowed to reconfigure the multifunctional fil

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4

Choi, Jin-Young, Jun-Seok Ma, and Wook-Sung Kim. "Reconfigurable Wideband Bandpass Filter Using Stepped Impedance Resonator Based on Liquid Crystals." Electronics 14, no. 12 (2025): 2325. https://doi.org/10.3390/electronics14122325.

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In this paper, a capacitively coupled-fed reconfigurable wideband bandpass filter (BPF) is proposed based on liquid crystal (LC) technology, which achieved three transmission poles across varying bias voltages (VB). An open-ended stepped impedance resonator configuration enables multi-mode resonance, offering significantly wider bandwidth compared to uniform-impedance resonators. The fractional bandwidth (FBW) and transmission pole positions are determined by the impedance ratio of the two resonators, allowing the filter to meet specific design requirements. An analytical methodology employing

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Bilal, Muhammad, Sara Shahid, Yousuf Khan, et al. "A Miniaturized FSS-Based Eight-Element MIMO Antenna Array for Off/On-Body WBAN Telemetry Applications." Electronics 11, no. 4 (2022): 522. http://dx.doi.org/10.3390/electronics11040522.

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In this paper, a compact multiple-input multiple-output (MIMO) antenna for an off/on-body wireless body area network (WBAN) is presented. The proposed antenna comprises eight elements arranged in a side-by-side, orthogonal, and across configuration on a planar laminate. This MIMO system achieves wideband impedance matching, i.e., fractional bandwidth (FBW) = 111% (7600 MHz) when placed off-body and FBW = 110% (7500 MHz) when placed on-body. The achieved bandwidth covers the ultrawideband (UWB) ranges 3.1–10.6 GHz for UWB-WBANs. To isolate the antenna elements, a Jerusalem cross (JC)-shaped fre

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Kakoyiannis, Constantine G., and Philip Constantinou. "Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks." International Journal of Antennas and Propagation 2013 (2013): 1–17. http://dx.doi.org/10.1155/2013/873234.

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Inverted-F antennas (IFAs) are a primary choice to implement the radiating system of portable devices. A tried and tested idea can remain topical if proven useful in modern applications. This paper shows that printed IFAs (PIFAs) are capable of forming robust, compact, dual-band radiating systems for wireless microsensors with an adjustable spacing between bands. Reactive tuning was applied by inductively loading the structures with prefractal slots; inductive slot loading degenerates higher-order resonances and increases the fractional bandwidth (FBW). The current distributions revealed that

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7

Yoon, Kicheol, and Kwanggi Kim. "Compact Size of an Interdigital Band-Pass Filter with Flexible Bandwidth and Low Insertion-Loss Using a Folded Spiral and Stepped Impedance Resonant Structure." Electronics 10, no. 16 (2021): 2003. http://dx.doi.org/10.3390/electronics10162003.

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A conventional interdigital bandpass filter (BPF) is characterized by coupled and tapped lines and affords low insertion loss (IL) and easy fractional bandwidth (FBW) adjustment. However, the maximum FBW of the filter is limited to 30%, beyond that, its gap size increases, thereby rendering filter fabrication impractical on a standard printed circuit board. In addition, the filter size cannot be changed because it dictates the operational frequency of the filter. Hence, in this study, we propose a compact interdigital BPF based on a spiral and folded stepped impedance resonator (SIR), which af

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8

Lalbakhsh, Ali, Seyed Morteza Alizadeh, Amirhossein Ghaderi, et al. "A Design of a Dual-Band Bandpass Filter Based on Modal Analysis for Modern Communication Systems." Electronics 9, no. 11 (2020): 1770. http://dx.doi.org/10.3390/electronics9111770.

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A dual-band bandpass filter (BPF) composed of a coupling structure and a bent T-shaped resonator loaded by small L-shaped stubs is presented in this paper. The first band of the proposed BPF covers 4.6 to 10.6 GHz, showing 78.9% fractional bandwidth (FBW) at 7.6 GHz, and the second passband is cantered at 11.5 GHz with a FBW of 2.34%. The bent T-shaped resonator generates two transmission zeros (TZs) near the wide passband edges, which are used to tune the bandwidth of the first band, and the L-shaped stubs are used to create and control the narrow passband. The selectivity performance of the

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9

Dembele, Salif N., Ting Zhang, Jingfu Bao, and Denis Bukuru. "Compact microstrip bandpass filter using dual closed-loop stepped impedance resonator." International Journal of Microwave and Wireless Technologies 10, no. 4 (2018): 405–11. http://dx.doi.org/10.1017/s1759078718000405.

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AbstractA dual closed-loop stepped impedance resonator (DCLSIR) is investigated and used in designing a compact microstrip bandpass filter (BPF). The proposed DCLSIR is symmetrical; as a result, the symmetric characteristics of the resonator have been used. The design equations are derived and used to support the circuit design. The center frequency, position of transmission zeros, and fractional bandwidth (FBW) are easily tuned by changing the physical dimensions of the resonator. Three transmission zeros are generated to improve the performance in the upper stopband. A DCLSIR prototype BPF i

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10

Huang, Yong Mao, Haiyan Jin, Yuliang Zhou, Supeng Leng, and Maurizio Bozzi. "Wideband isolation-improved substrate-integrated waveguide power dividers/combiners." International Journal of Microwave and Wireless Technologies 10, no. 9 (2018): 1019–27. http://dx.doi.org/10.1017/s1759078718000995.

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AbstractIn this paper, a 3 dB H-plane substrate-integrated waveguide (SIW) power divider/combiner with improved isolation is reported. By adding two isolated ports into the Y-junction, it will perform like a multi-port coupler, so that the isolation between its dividing ports can be effectively improved as the newly-added ports are properly matched. To verify the availability and effectiveness of this concept, two prototypes, one is terminated by coaxial terminations and the other is loaded with lumped resistors, are developed. Their measured results are separately in good agreement with their

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Alazemi, Abdullah J. "Dual-Band and Wideband Bandpass Filters Using Coupled Lines and Tri-Stepped Impedance Stubs." Micromachines 14, no. 6 (2023): 1254. http://dx.doi.org/10.3390/mi14061254.

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In this paper, two bandpass filters—one with a dual-band response and the other with a wideband response—were designed, implemented, and experimented with. The filters are based on the novel combination of series coupled lines and tri-stepped impedance stubs. However, coupled lines along with tri-stepped impedance open stubs (TSIOSs) give a third-order dual passband response. The advantage of dual-band filters using coupled lines and TSIOSs is that they have wide passbands that are close together and separated by a single transmission zero. In contrast, the inclusion of tri-stepped impedance s

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12

Li, Philip, Jason Fleischer, Edwin Quinn, and Donghun Park. "Fabrication of an Optically Transparent Planar Inverted-F Antenna Using PEDOT-Based Silver Nanowire Clear Ink with Aerosol-Jet Printing Method towards Effective Antennas." Journal of Manufacturing and Materials Processing 8, no. 1 (2024): 39. http://dx.doi.org/10.3390/jmmp8010039.

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We report the design, fabrication, and experimental characterization of an optically transparent printed planar inverted-F antenna (PIFA) operating at 2.45 GHz using the aerosol jet (AJ) printing method. The proposed antenna was fabricated using a clear conductive ink on glass and Delrin. The antenna exhibits a wide fractional bandwidth (FBW) of 20% centered at 2.45 GHz, with a peak realized gain of −3.6 dBi and transparency of ~80%. The proposed fabrication method provides a cost-effective and scalable solution for manufacturing transparent antennas with potential applications in wireless com

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13

Rezki, El Arif, Aziz Muslim Muhammad, and Hadi Pramono Sholeh. "Compact Stepped Impedance Resonator Bandpass Filter with Tunable Transmission Zeros." TELKOMNIKA Telecommunication, Computing, Electronics and Control 15, no. 4 (2017): 1689–92. https://doi.org/10.12928/TELKOMNIKA.v15i4.6695.

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This paper proposes a compact microstrip bandpass filter (BPF) with tunable transmission zero, narrow bandwidth and low insertion loss. Transmission zeros are the key to improve the band rejection and filter frequency selectivity. A λ/4 stepped impedance resonator (SIR) with two additional via holes has been adopted to obtain a compact size and a pair of transmission zero (TZ). The BPF is designed to operate at 3.5 GHz with fractional bandwidth (FBW) of 7.2%.Furthermore, three techniques have been developed to create a pair of controllable transmission zeros on both side of each passban

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14

Vallecchi, A., R. J. Langley, and A. G. Schuchinsky. "Voltage Controlled Intertwined Spiral Arrays for Reconfigurable Metasurfaces." International Journal of Antennas and Propagation 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/171637.

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Reconfigurable bistate metasurfaces composed of interwoven spiral arrays with embeddedpindiodes are proposed for single and dual polarisation operation. The switching capability is enabled bypindiodes that change the array response between transmission and reflection modes at the specified frequencies. The spiral conductors forming the metasurface also supply the dc bias for controllingpindiodes, thus avoiding the need of additional bias circuitry that can cause parasitic interference and affect the metasurface response. The simulation results show that proposed active metasurfaces exhibit goo

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15

Zhang, Gang, Zhenyao Qian, Yushou Chen, and Yang Zhao. "A Wide Stopband Balun Bandpass Filter with Its Application to Balanced Quasi-Yagi Antenna." Wireless Communications and Mobile Computing 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/4725072.

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A new microstrip balun bandpass filter (BPF) with wide stopband is presented. It is realized by utilizing the out-of-phase feature of standing-wave distribution on a half-wavelength (λ/2) open-ended microstrip line and the resonant characteristics of the triple-mode resonators. For demonstration, a prototype balun BPF operating at central frequency (f0) of 2.34 GHz with fractional bandwidth (FBW) of about 16.7% is designed. The presented balun BPF not only exhibits nice balanced response with 0.47 dB magnitude imbalance and 4.3° phase difference but also achieves 30-dB harmonic suppression up

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16

Roshani, Saeed, Salah I. Yahya, Sobhan Roshani, Amir Hossein Farahmand, and Siroos Hemmati. "Design of a Modified Compact Coupler with Unwanted Harmonics Suppression for L-Band Applications." Electronics 11, no. 11 (2022): 1747. http://dx.doi.org/10.3390/electronics11111747.

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This paper presents the design, analysis, and fabrication of a new miniaturized microstrip branch line coupler (BLC) with high harmonics suppression. The T-shaped resonators, open stubs cross-shaped resonators and radial stubs are used in the proposed coupler design. The designed BLC operates at 1 GHz frequency, which can suppress up to 5th spurious harmonics with a 20 dB level of attenuation. High miniaturization of about 86% is obtained for the proposed BLC, which is corresponding to the normalized size of 0.009 λg2. The measured values of isolation and return loss are obtained 28 dB and 29

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17

Li, Ruibo, Peng Li, Paolo Rocca, et al. "Design of Wideband High-Gain Patch Antenna Array for High-Temperature Applications." Sensors 23, no. 8 (2023): 3821. http://dx.doi.org/10.3390/s23083821.

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A low-profile, wideband, and high-gain antenna array, based on a novel double-H-shaped slot microstrip patch radiating element and robust against high temperature variations, is proposed in this work. The antenna element was designed to operate in the frequency range between 12 GHz and 18.25 GHz, with a 41.3% fractional bandwidth (FBW) and an obtained peak gain equal to 10.2 dBi. The planar array, characterized by a feed network with a flexible 1 to 16 power divider, comprised 4 × 4 antenna elements and generated a pattern with a peak gain of 19.1 dBi at 15.5 GHz. An antenna array prototype wa

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18

Arain, Salman, Abdul Quddious, Symeon Nikolaou та Photos Vryonides. "Demonstration of Reconfigurable BPFs with Wide Tuning Bandwidth Range Using 3λ/4 Open- and λ/2 Short- Ended Stubs". Technologies 8, № 1 (2020): 14. http://dx.doi.org/10.3390/technologies8010014.

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In this paper, two implementations of reconfigurable bandwidth bandpass filters (BPFs) are demonstrated both operating at a fixed center frequency of 2.4 GHz. The proposed reconfigurable bandwidth filters are based on a square ring resonator loaded with λg/4 open-ended stubs that are permanently connected to the ring and converted to either 3λg/4 open-ended stubs or λg/2 short-ended stubs by means of positive-intrinsic-negative(PIN) diodes to implement two reconfigurable bandwidth states for each case. Due to the symmetrical nature of the design, even- and odd-mode analysis is used to derive t

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19

Rashid, Aamir, Mudassir Murtaza, Syed Azhar Ali Zaidi, Hammad Zaki, and Farooq A. Tahir. "A single-layer, wideband and angularly stable metasurface based polarization converter for linear-to-linear cross-polarization conversion." PLOS ONE 18, no. 1 (2023): e0280469. http://dx.doi.org/10.1371/journal.pone.0280469.

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In this article, a single-layer metasurface based reflector design is proposed for linear-to-linear cross-polarization conversion in microwave frequency range. The unit-cell of the proposed design consists of triple-arrow resonant design printed on a grounded FR4 substrate. Excellent cross-conversion is achieved over a broad frequency range (8.0–18.50 GHz) with polarization conversion efficiency higher than 90%. The proposed design has a large fractional bandwidth (FBW) of 80% due to three resonances occurring in the band. The polarization response is angularly stable with respect to oblique i

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20

Huang and Yuan. "A Compact Wideband SIW Bandpass Filter with Wide Stopband and High Selectivity." Electronics 8, no. 4 (2019): 440. http://dx.doi.org/10.3390/electronics8040440.

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A novel method to design a wideband substrate integrated waveguide (SIW) bandpass filter (BPF) with compact size, wide stopband and high selectivity is presented. In this method some unique electromagnetic band-gap (EBG) cells are periodically etched on the top layer of SIW to realize a wide passband propagating below the equivalent waveguide cutoff frequency. By changing the configuration of EBG cells, undesired harmonics in upper stopband can be suppressed and a wideband BPF with wide stopband can be obtained. By symmetrically loading two complementary split ring resonators (CSRRs) on the ta

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21

Ouyang, Liang-Wei, Jill C. Mayeda, Clint Sweeney, Donald Y. C. Lie, and Jerry Lopez. "A Broadband Millimeter-Wave 5G Low Noise Amplifier Design in 22 nm Fully Depleted Silicon-on-Insulator (FD-SOI) CMOS." Applied Sciences 14, no. 7 (2024): 3080. http://dx.doi.org/10.3390/app14073080.

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This paper presents a broadband millimeter-wave (mm-Wave) low noise amplifier (LNA) designed in a 22 nm fully depleted silicon-on-insulator (FD-SOI) CMOS technology. Electromagnetic (EM) simulations suggest that the LNA has a 3-dB bandwidth (BW) from 17.8 to 42.4 GHz and a fractional bandwidth (FBW) of 81.7%, covering the key frequency bands within the mm-Wave 5G FR2 band, with its noise figure (NF) ranging from 2.9 to 4.9 dB, and its input-referred 1-dB compression point (IP1dB) of −17.9 dBm and input-referred third-order intercept point (IIP3) of −8.5 dBm at 28 GHz with 15.8 mW DC power cons

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22

Pramono, Subuh, Budi Basuki S., and Tommi Hariyadi. "Modified Ultra Wideband (UWB) Antipodal Vivaldi Antenna for 5." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (2018): 3067. http://dx.doi.org/10.11591/ijece.v8i5.pp3067-3075.

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<p>This paper presents a half triangular Comb-shaped slits edge Antipodal Vivaldi Antenna (Comb-AVA) as compared to the conventional Antipodal Vivaldi Antenna (AVA) design. This proposed antenna covers 20-40 GHz spectrum. This Comb-AVA antenna is designed for the 5G application which is addressed to cover a dualband 28/38 GHz frequencies. A half triangular comb-shaped slits edge structure is employed to investigate its effects on antenna parameters. This proposed Comb-AVA occupies a 25x8 mm2 of FR 4 substrate (𝜀𝛾 = 4.4, tan δ=0.02, thinkness 1.6 mm). It has impedance bandwidth (S11≤-10 d

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Subuh, Pramono, Basuki S. Budi, and Hariyadi Tommi. "Modified Ultra Wideband (UWB) Antipodal Vivaldi Antenna for 5G." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (2018): 3067–75. https://doi.org/10.11591/ijece.v8i5.pp3067-3075.

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This paper presents a half triangular Comb-shaped slits edge Antipodal Vivaldi Antenna (Comb-AVA) as compared to the conventional Antipodal Vivaldi Antenna (AVA) design. This proposed antenna covers 20-40 GHz spectrum. This Comb-AVA antenna is designed for the 5G application which is addressed to cover a dualband 28/38 GHz frequencies. A half triangular comb-shaped slits edge structure is employed to investigate its effects on antenna parameters. This proposed Comb-AVA occupies a 25x8 mm<sup>2</sup> of FR 4 substrate (𝜀𝛾=4.4, tan δ=0.02, thinkness 1.6 mm). It has impedance bandwidth (S11

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24

Bi, Xiaokun, Shaohua Guo, Yujian Zhu, and Tao Yuan. "A Wideband Slotted Spherical Waveguide Antenna Based on Multi-Mode Concept." Electronics 9, no. 10 (2020): 1656. http://dx.doi.org/10.3390/electronics9101656.

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A wideband slotted spherical waveguide antenna based on the multi-mode concept is presented. The proposed design starts from a metallized spherical cavity fed by a rectangular waveguide. Then, two groups of slots are symmetrically cut on the shell. By suitably choosing the slot dimensions and locations, four radiation modes can be excited in a single radiator and merged with each other, resulting in a wideband radiation characteristic. To verify this, a prototype is designed and fabricated using stereolithography apparatus to achieve a light weight. As the measured fractional bandwidth (FBW) o

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25

Kumar, Abhishek, Dileep Kumar Upadhyay, and Srikanta Pal. "A compact parallel coupled meander lines shaped composite right/left-handed transmission line (CRLH-TL) based symmetric quasi-0 dB coupler." Frequenz 74, no. 9-10 (2020): 295–307. http://dx.doi.org/10.1515/freq-2019-0165.

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AbstractIn this paper, parallel coupled meander lines (PCML) composite right/left-handed transmission line (CRLH-TL) based symmetrical quasi-0 dB coupled-line coupler is presented. Proposed coupler shows measured backward wave coupling level of 0.81 dB at frequency of 6.17 GHz with 3 dB fractional bandwidth (FBW) of 12.64%. Throughout the 3 dB frequency range (5.78–6.56 GHz), isolation and insertion loss of the coupler is better than 24 dB. Overall size of the proposed coupler is 19.6 × 12.1 mm. An equivalent lumped LC circuit model of the coupler is demonstrated. Measured results of the coupl

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26

Alam, Syah, Indra Surjati, Lydia Sari, et al. "Wide band and high gain microstrip antenna using planar series array 4×2 element for 5G communication system." Eastern-European Journal of Enterprise Technologies 4, no. 5 (124) (2023): 16–24. http://dx.doi.org/10.15587/1729-4061.2023.285395.

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The 5G communication system requires an antenna as a receiving device that has high performance including wide bandwidth and high gain. Microstrip antennas have advantages such as low cost, suitable for high frequencies and easy to integrate with other devices. One of the disadvantages of microstrip antennas is their narrow bandwidth and low gain. Therefore, microstrip antennas with wide bandwidth and high gain are especially needed to support 5G communication systems. This paper provides a solution by proposed a wide bandwidth and high gain microstrip antenna operating at a resonant frequency

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27

Wang, Zhi-Ji, Eun-Seong Kim, Jun-Ge Liang, Tian Qiang, and Nam-Young Kim. "A High-Frequency-Compatible Miniaturized Bandpass Filter with Air-Bridge Structures Using GaAs-Based Integrated Passive Device Technology." Micromachines 9, no. 9 (2018): 463. http://dx.doi.org/10.3390/mi9090463.

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This paper reports on the use of gallium arsenide-based integrated passive device technology for the implementation of a miniaturized bandpass filter that incorporates an intertwined circle-shaped spiral inductor and an integrated center-located capacitor. Air-bridge structures were introduced to the outer inductor and inner capacitor for the purpose of space-saving, thereby yielding a filter with an overall chip area of 1178 μm × 970 μm. Thus, not only is the chip area minimized, but the magnitude of return loss is also improved as a result of selective variation of bridge capacitance. The pr

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Beddiafi, Y., D. Abed, A. Boualleg, and E. Mehallel. "MIMO CPW-Fed Bent Antenna Based USB Dongle for ECMA-368 WPANs." Advanced Electromagnetics 10, no. 3 (2021): 50–57. http://dx.doi.org/10.7716/aem.v10i3.1676.

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A multiple-input-multiple-output (MIMO) ultra-wideband (UWB ) printed bent antenna, suitable for MB-OFDM ECMA-368 system integration with the wireless universal serial-bus (WUSB) dongle is proposed. The antenna consists of two antenna elements with an overall area of 18 X 53 mm2. Each antenna element is a simple modified folded-monopole fed by a coplanar waveguide (CPW). The design process of proposed MIMO UWB CPW-fed bent antenna configuration is presented in four simple steps. Experimental results show that the proposed design has a good impedance bandwidth in the range of 2.95–18.55 GHz wit

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Lin, Ding-Bing, Mei-Hui Wang, Aloysius Adya Pramudita, and Tjahjo Adiprabowo. "Design of a Novel Ultra-Wideband Common-Mode Filter Using a Magnified Coupled Defected Ground Structure." Applied Sciences 13, no. 13 (2023): 7404. http://dx.doi.org/10.3390/app13137404.

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An ultra-wideband common-mode (CM) filter for a gigahertz (GHz) data rate signal is proposed in this paper. The proposed filter was designed only on the printed circuit board (PCB) ground plane; no additional components wererequired. We took advantage of producing second-order transmission zero by an asymmetrical magnified coupled DGS to extend the suppression bandwidth. Full-wave simulations and equivalent circuit models of the DGS resonator were established to predict the suppression performance. The measured differential-mode insertion loss (Sdd21) from direct current (DC) to 12.35 GHz was

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Kumar, Abhishek, and Dileep Kumar Upadhyay. "A compact planar diplexer based on via-free CRLH TL for WiMAX and WLAN applications." International Journal of Microwave and Wireless Technologies 11, no. 2 (2018): 130–38. http://dx.doi.org/10.1017/s1759078718001496.

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AbstractIn this paper, design and development of a via-free composite right/left handed transmission line (CRLH TL)-based diplexer for WiMAX and WLAN bands is reported. The diplexer is having two channels, where each channel consists of a separate bandpass filter (BPF). The BPF of both channels are designed on via-free CRLH TLs based on a newly proposed right-angled corner-modified split ring resonator (RAC-MSRR) structure. The RAC-MSRR incorporates meander paths because of which working scope of frequencies is focused for measured center frequencies (f1) 3.5 GHz with −3 dB fractional bandwidt

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Khudaraham, Ahmed Lateef, and Dhirgham Kamal Naji. "Design of A Dual-Wide Band BPF Utilizing Parallel Coupled Microstrip Lines and A Centered Arrow-Shaped Resonator." Al-Nahrain Journal for Engineering Sciences 23, no. 2 (2020): 153–58. http://dx.doi.org/10.29194/njes.23020153.

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This paper presents a dual wide-band band pass filter (DWB-BPF) by using two parallel, symmetrical micro-strip lines loaded by a centered resonator, consisting of a T- and a triangle-shaped geometry, attached at the lower and upper ends, respectively. The filter reveals good performance and both the passbands can be independently controlled by adjusting specific parts of the filter. The proposed BPF is simulated by using CST microwave studio package and the simulated result is verified experimentally with good agreement between the two results. The fabricated prototype BPF demonstrates two pas

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Hameed, Musab, Gaobiao Xiao, Ali Najam, Lina Qiu, and Tayyab Hameed. "Quadruple-Mode Wideband Bandpass Filter with Improved Out-of-Band Rejection." Electronics 8, no. 3 (2019): 300. http://dx.doi.org/10.3390/electronics8030300.

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This paper proposes a method for designing a quadruple-mode wideband bandpass filter using off-centered perturbed metallic cylinders in a rectangular waveguide cavity with compact size and improved out-of-band rejection. Two off-centered perturbation cylinders were placed at the bottom of the rectangular waveguide cavity along with a pair of perpendicularly-fed coaxial lines, which excited four quasi-transverse magnetic (TM) modes to realize the desired passband. The height of the waveguide cavity and the shape of the perturbation cylinders were exploited to achieve an all quasi-TM modes filte

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Roshani, Sobhan, Salah I. Yahya, Saeed Roshani, and Meysam Rostami. "Design and Fabrication of a Compact Branch-Line Coupler Using Resonators with Wide Harmonics Suppression Band." Electronics 11, no. 5 (2022): 793. http://dx.doi.org/10.3390/electronics11050793.

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The branch-line coupler (BLC) is an important device in radio frequency (RF) and microwave (MW) circuits. The main drawbacks of the conventional BLC are as follows: first, the four long quarter-wavelength (λ/4) transmission line sections occupy a large size, especially at the low frequencies, and second, the presence of unwanted harmonics. This research paper presents a compact 750 MHz BLC with harmonics suppression using resonators. The typical BLC consists of four λ/4 branches, two series arms of 35 Ω and two shunt arms of 50 Ω impedances. In the proposed BLC, these long branches are replace

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Ojaroudi Parchin, Naser, Haleh Jahanbakhsh Basherlou, Yasir I. A. Al-Yasir, Ahmed M. Abdulkhaleq, and Raed A. Abd-Alhameed. "Ultra-Wideband Diversity MIMO Antenna System for Future Mobile Handsets." Sensors 20, no. 8 (2020): 2371. http://dx.doi.org/10.3390/s20082371.

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A new ultra-wideband (UWB) multiple-input/multiple-output (MIMO) antenna system is proposed for future smartphones. The structure of the design comprises four identical pairs of compact microstrip-fed slot antennas with polarization diversity function that are placed symmetrically at different edge corners of the smartphone mainboard. Each antenna pair consists of an open-ended circular-ring slot radiator fed by two independently semi-arc-shaped microstrip-feeding lines exhibiting the polarization diversity characteristic. Therefore, in total, the proposed smartphone antenna design contains fo

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De, Arnab, Bappadittya Roy, and Anup Kumar Bhattacharjee. "Dual-Notched Monopole Antenna Using DGS for WLAN and Wi-MAX Applications." Journal of Circuits, Systems and Computers 28, no. 11 (2019): 1950189. http://dx.doi.org/10.1142/s0218126619501895.

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In this paper, a wideband printed polygon-shaped monopole antenna has been designed using microstrip line feeding technique which provides dual-notch band characteristics (2.98–3.19[Formula: see text]GHz) and (3.62–5.00[Formula: see text]GHz) by the use of slots geometry in both the patch and the ground plane. The results of the antenna have been compared both with and without slots in both planes. The initial antenna without DGS and slots in the patch was made to work in the frequency range from 2.56–5.98[Formula: see text]GHz having impedance bandwidth of about 80.09%. The proposed antenna c

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Roshani, Sobhan, Salah I. Yahya, Maher Assaad, et al. "A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs." Symmetry 15, no. 12 (2023): 2149. http://dx.doi.org/10.3390/sym15122149.

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In this paper, a new structure of the quadrature hybrid coupler (QHC) with compact size is proposed using capacitive composite lines and meandered open stubs. The proposed coupler works at 1.6 GHz with a 0.4 GHz bandwidth, which shows 25% fractional bandwidth (FBW). The proposed QHC occupies only 15 mm × 15 mm (0.12 λ × 0.12 λ), while the typical QHC size is 32 mm × 32 mm (0.25 λ × 25 λ) at the same working frequency. In the designed structure, two symmetric meandered stubs and two symmetric π-shaped composite networks including capacitors and microstrip lines are applied together. The designe

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Lu, Zengtian, Sulei Fu, Zhibin Xu, et al. "Fractional Bandwidth up to 24% and Spurious Free SAW Filters on Bulk 15°YX-LiNbO3 Substrates Using Thickness-Modulated IDT Structures." Micromachines 13, no. 3 (2022): 439. http://dx.doi.org/10.3390/mi13030439.

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To cope with ubiquitous wireless connectivity and the increased and faster data delivery in 5G communication, surface acoustic wave (SAW) filters are progressively requiring wider bandwidths. Conventional bulk 15°YX-LiNbO3 substrates with a large coupling coefficient (K2) are attractive for the low-cost mass production of wideband SAW filters, but these generally suffer from spurious responses, limiting their practical application. In this work, a novel and simple SAW configuration is proposed that uses thickness-modulated interdigital transducer (IDT) structures to overcome the limitations se

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Yechou, Lahcen, Abdelwahed Tribak, Kacim Mohamed, Jamal Zbitou, Abdelmalik Bouyahyaoui, and Angel Mediavilla Sanchez. "Planar wideband band-stop filter with T-inverted shaped open stubs for wideband applications." International Journal of Microwave and Wireless Technologies 9, no. 4 (2016): 773–80. http://dx.doi.org/10.1017/s1759078716000891.

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This paper presents a wideband band-stop filter (BSF) structure designed by using planar technology. The proposed filter consists of a modified conventional band-stop structure with open stubs, inner T-inverted shape, and two input/output feed lines. Based on series of optimization and a specific design method, two compact filters with good electrical performance are obtained. In order to characterize the frequency response of the proposed filters, the performance is carried out numerically using two different solvers (Advanced Design System -Momentum and CST-MWS). Furthermore, in order to val

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Nuraiza Ismail and Ermeey Abd Kadir. "A Co-Planar Waveguide Ultra-Wideband Antenna for Ambient Wi-Fi RF Power Transmission and Energy Harvesting Applications." International Journal of Engineering and Technology Innovation 13, no. 4 (2023): 265–83. http://dx.doi.org/10.46604/ijeti.2023.11444.

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This study proposes an ultra-wideband antenna for ambient radio frequency (RF) energy harvesting applications. The antenna is based on a co-planar waveguide (CPW) transmission line and incorporates a rectangular slot as an antenna harvester. The proposed antenna utilizes an evolutionary design process to achieve impedance matching of the 50 Ω CPW feeding line over the desired frequency bands. A parametric study investigates CPW elements and rectangular slot size. The harvester antenna is then connected to the primary rectifier circuit of the voltage doubler to examine the signal characteristic

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Zhu, Zhongbo, Weidong Hu, Kaida Xu, Yuming Bai, and Sheng Li. "A W-Band Chebyshev Waveguide Bandpass Filter with Wide Stopband Performance." Electronics 13, no. 9 (2024): 1793. http://dx.doi.org/10.3390/electronics13091793.

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In this paper, a W-band waveguide bandpass filter with a standard fourth-order Chebyshev response is proposed based on the computer numerical control (CNC)-milling technology. The harmonics-staggered technique and orthogonal coupling method are incorporated into this waveguide filter design without increasing the complexity of the filter structure in order to suppress the intrinsic spurious responses near the passband. Furthermore, the proposed filter design maintains a simple construction, which can be conveniently fabricated using CNC milling. The fabricated waveguide filter exhibits an aver

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Wang, Jian, Junping Duan, Xinxin Shen, Yongsheng Wang, and Binzhen Zhang. "Miniaturized Lens Antenna with Enhanced Gain and Dual-Focusing for Millimeter-Wave Radar System." Micromachines 15, no. 3 (2024): 335. http://dx.doi.org/10.3390/mi15030335.

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This paper presents a waveguide Lens antenna at the W-band adopting dual-focusing Lens to improve the performance. The Lens antenna consisted of a waveguide slotted structure and lenses processed using NOA73 meet the demands of miniaturization for current communication systems. The antenna radome fabricated using NOA73 not only protects the antenna structure but also improves the gain of the antenna by about 9.5 dBi via electromagnetic wave dual-focusing. A prototype is fabricated using novel UV-LIGA technology. Measured results are compared with simulated values. Measured results confirmed th

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Al-Yasir, Yasir I. A., Mohammed K. Alkhafaji, Hana’a A. Alhamadani, et al. "A New and Compact Wide-Band Microstrip Filter-Antenna Design for 2.4 GHz ISM Band and 4G Applications." Electronics 9, no. 7 (2020): 1084. http://dx.doi.org/10.3390/electronics9071084.

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A new and compact four-pole wide-band planar filter-antenna design is proposed in this article. The effect of the dielectric material type on the characteristics of the design is also investigated and presented. The filter-antenna structure is formed by a fourth-order planar band-pass filter (BPF) cascaded with a monopole microstrip antenna. The designed filter-antenna operates at a centre frequency of 2.4 GHz and has a relatively wide-band impedance bandwidth of about 1.22 GHz and a fractional bandwidth (FBW) of about 50%. The effects of three different types of substrate material, which are

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Fan, Xiangsuo, Yanfang Ma, Linping Feng, Tianfeng Li, Wenhao Xu, and Huajin Chen. "Constructing a Microstrip Phase Shifter with Low Phase Error Using a Y-Resonator." Electronics 13, no. 24 (2024): 5006. https://doi.org/10.3390/electronics13245006.

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In this paper, we propose a Y-type dual-mode microstrip phase shifter that utilizes input–output cross-coupling. The structure comprises a main line and a reference line, with the main line designed in a cross-coupled parallel-feeding configuration to create a band-pass filter. The single-mode resonance frequency is fine-tuned to meet the bandwidth requirements of the band-pass filter. Additionally, by introducing new symmetric transmission zeros in the upper and lower cutoff bands through the cross-coupling of the input and output feed lines, we achieve a quasi-elliptic response. This design

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Sirci, Stefano, Jorge Martínez, and Vicente Boria. "A Novel Magnetic Coupling for Miniaturized Bandpass Filters in Embedded Coaxial SIW." Applied Sciences 9, no. 3 (2019): 394. http://dx.doi.org/10.3390/app9030394.

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In this paper, embedded coaxial substrate integrated waveguide (CSIW) filters with innovative magnetic couplings are presented and studied. By creating the loading capacitance of a combline topology using inner layers of a low-temperature co-fired ceramic (LTCC) stack-up, it is possible to achieve resonator miniaturization while improving the spurious-free band and providing full-packaged solutions. Moreover, a new magnetic coupling scheme consisting of short-ended stripline probes is proposed and analyzed in detail, both for direct and external couplings. An in-line three-pole filter at L-ban

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Abdul, Kayum Mohammad Zakir Hossain, Ibn Ibrahimy Muhammad, Sutikno Tole, Hatta Jopri Mohd, Abedalrahim Jamil Alsayaydeh Jamil, and Manap Mustafa. "A two-element planar multiple input multiple output array for ultra-wideband applications." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 6 (2022): 6847–58. https://doi.org/10.11591/ijece.v12i6.pp6847-6858.

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In this article, a planar monopole two-element multiple input multiple output (MIMO) array has been designed and characterized with the intention of ultra-wideband (UWB) applications. The array has a voltage standing wave ratio (VSWR) working bandwidth (BW) of 13.258 GHz between 3.394-16.652 GHz, with a fractional BW (FBW) of 132.28% with respect to a center frequency of 10.023 GHz. The two elements of the MIMO array are 900 polarizations mismatched for better isolation. Consequently, less than 20 dB of isolation has been achieved throughout the entire BW. Also observed was a good combined rea

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Weng, Zibin, Yahong Li, Youqian Su, et al. "Design and Analysis of Ultra-Thin Broadband Transparent Absorber Based on ITO Film." Micromachines 16, no. 6 (2025): 653. https://doi.org/10.3390/mi16060653.

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In this paper, we design an ultra-thin broadband transparent absorber based on indium tin oxide (ITO) film, and we choose polymethyl methacrylate (PMMA) high-transmittance dielectric sheet instead of the traditional dielectric sheet and polyethylene glycol terephthalate (PET) as the ITO film substrate. Simulation results indicate that the absorber achieves more than 90% absorption for positively incident electromagnetic waves in the broadband range of 5–21.15 GHz with a fractional bandwidth (FBW) of 123.5% and a thickness of 6.3 mm (0.105 λL, where λL is the wavelength at the lowest frequency)

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Khan, Sanaullah, Lubina Iram, Tehseenullah Khan, Abdul Qayoom, and A. K. M. Zakir Hossain. "Inline Bandpass Filtering Waveguide Antenna with Two Transmission Zeros Based on All-resonator Structures." Journal of Engineering Technology and Applied Physics 7, no. 1 (2025): 1–6. https://doi.org/10.33093/jetap.2025.7.1.1.

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Nowadays, a significant amount of effort is being devoted to miniaturizing the design of filtering antennas for future wireless communication systems. However, there are numerous design strategies documented in the literature, most of which are relevant to specific microwave circuit configurations. Moreover, they often require additional matching circuits, which increase the overall size of the filtering antenna. This study introduces a generic coupling matrix approach for developing a second-order filtering antenna with two transmission zeros operating at cross-band frequencies. The last reso

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Anjaneyulu, Katuru, Raja Banda Srinivas, Venkata Narayana Y, and Kadire Sumalatha. "Corner Defected Multi-Resonance Ultra-Wideband Rectangular Patch Antenna." Indian Journal of Science and Technology 15, no. 4 (2022): 175–83. https://doi.org/10.17485/IJST/v15i4.1800.

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ABSTRACT <strong>Objectives:</strong> The main objective of this article is to present a novel corner defected ultra wideband (UWB-3.1 to 10.6 GHz) rectangular patch with a partial ground plane to enhance the bandwidth with multi-resonance characteristics. By defecting the corners, the original rectangle patch will be converted into defected shape of proposed one to satisfy the objective.<strong> Methods:</strong> A FR-4 substrate with height (h) of 1.6 mm, dielectric constant (e r) of 4.3 and the loss tangent of 0.025 was used to develop the required antenna. The antenna was ex

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Mahant, Keyur, and Hiren Mewada. "A Novel Substrate Integrated Waveguide (SIW) Based Highly Selective Filtering Power Divider." International Journal of Sensors, Wireless Communications and Control 10, no. 3 (2020): 430–36. http://dx.doi.org/10.2174/2210327909666190411120032.

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Aims: In this paper, a novel Substrate Integrated Waveguide (SIW) based filtering power divider is presented. Objective: In the proposed power divider, filtering response is achieved by interleaving inductive posts in the SIW structure. The proposed structure reduces the size and the cost of the system, as the structure performs the function of the power divider as well as the function of a filter. Methods: Simulation of the proposed structure was carried out using commercial software Ansoft High Frequency Structure Simulator (HFSS), which is a three-dimensional full-wave solver utilizing the

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Tang, Xianli, and Yonghao Jia. "A novel enlarging fractional bandwidth technique for acoustic‐wave‐lumped‐element resonator‐based bandpass filters." Electronics Letters 60, no. 14 (2024). http://dx.doi.org/10.1049/ell2.13278.

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AbstractA novel enlarging fractional bandwidth (FBW) technique for acoustic‐wave‐lumped‐element resonator (AWLR)‐based bandpass filters is presented. The new technique is based on a series of matching inductors that replace the parallel or series acoustic wave (AW) resonators of AW filters to beak the bandwidth constraint of the ladder‐type structure. In addition, the transmission response analysis of the proposed AWLR‐based filter is provided. A prototype of the AWLR‐based filter is fabricated and tested to validate the proposed FBW widening technique. The measured insertion loss, FBW, and ou

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