A Design of Branch-Line Coupler with Harmonic Suppression and Size Reduction Using Closed-Loop and Open-Loop Resonators

Abdipour, Arash; Zare, E.

doi:10.13164/re.2017.0999

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…The conventional branchline coupler consists of four quarter-wavelength transmission lines and offers a single passband. Several methods have been utilized to realize harmonic suppression in single-band branchline couplers [1][2][3][4][5][6][7]. In [1], a coupled-line section was used to achieve a compact size and spurious rejection.…”

Section: Introductionmentioning

confidence: 99%

“…Multiple asymmetric π-shaped structures [2] and H-shaped structures [3] were utilized to realize a compact size and harmonic suppression. Resonators with an interdigital structure [4], radial-shaped resonators [5], closed-loop, open-loop resonators [6], and stepped impedance resonators [7] have been used to achieve the proposed couplers. In [8][9][10][11][12][13], dual-band branch-line couplers were proposed.…”

Section: Introductionmentioning

confidence: 99%

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A Dual-Band Branch-Line Coupler with Ultra-Wideband Harmonic Suppression

Zhang

Lee

2023

J. Electromagn. Eng. Sci

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A dual-band branch-line coupler with ultra-wideband harmonic suppression is proposed in this paper. The conventional quarter-wavelength transmission lines are replaced with π-shaped lines to achieve a dual band. In addition, ultra-wideband harmonic suppression is obtained by the frequency-selecting coupling structure (FSCS) providing three transmission zeros. The two operating frequencies are 0.9 GHz and 2.0 GHz, and the corresponding -10 dB bandwidth at 0.9 GHz and 2.0 GHz is 18.9% and 10.5%, respectively. A wide harmonic suppression band is generated from 3.7 GHz to 8.3 GHz. The simulation and measurement results are in good agreement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Dual-Band Branch-Line Coupler with Ultra-Wideband Harmonic Suppression

Zhang

Lee

2023

J. Electromagn. Eng. Sci

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“…In [46], the second and third harmonics can be suppressed using a branch‐line coupler with closed‐loop and open‐loop resonators. Recently, to remove the second harmonic in a parallel coupled‐line BPF, a coupling capacitor is used surrounding the offset gap in a compact filter.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of a novel multilayer bandpass filter with high‐order harmonics suppression using parallel coupled microstrip filter

2022

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This study presents a novel multilayer structure of parallel coupled‐line bandpass filtercentered at 2.42 GHz with a fractional bandwidth value of approximately 19.4%. The designed filter can suppress harmonics with an appropriate frequency response by incorporating different techniques based on the multilayer technique. A combination of different techniques such as radial microstrip stubs and defected ground structure (DGS) and defected microstrip structure techniques are employed to suppress harmonics up to 5f0. These techniques are used in two layers to suppress up to 5f0. In addition, in this study, the effects of different parameters, such as the width of slot‐line DGS, the angle of diagonal line slots in the upper layer, and the air gap between the two layers on the filter performance, are investigated. To verify the correct circuit operation, the designed filter is implemented and tested. The measurement results of the proposed filter are compared with the simulation results.

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“…However, the conventional 3 dB branch-line coupler is also confronted with the problem of a large occupied area brought in by two pairs of quarter-wavelength transmission lines with 50 Ω and 35.4 Ω. In order to reduce the size, some solutions are reported, such as loading a π-equivalent artificial transmission line [19], using asymmetrical T-structures [20], utilizing high-impedance transmission lines and interdigitated shunt capacitors [21], applying artificial transmission line combined with meandered lines and resonators [22], and employing transmission lines loaded resonators [23]. However, only the couplers in [21][22][23] can realize harmonic suppression.…”

Section: Introductionmentioning

confidence: 99%

“…In [22], shunt LC resonators generate suppression for high-frequency harmonics, but a second-order harmonic and third-order harmonic cannot be suppressed. In [23], harmonics are suppressed due to the transmission zeros of resonators. In addition, these cases in [19,21] are realized with size reduction, but 15 dB bandwidths are only 8.9% and 7.2%.…”

Section: Introductionmentioning

confidence: 99%

Compact Microwave Components with Harmonic Suppression Based on Artificial Transmission Lines

Huang

et al. 2019

International Journal of Antennas and Propagation

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In this paper, compact microwave components, including a Wilkinson power divider and a 3 dB branch-line coupler based on artificial transmission lines (ATLs) with harmonic suppression, are presented. A section ATL is consisted of microstrip stepped impedance transmission lines and a microstrip interdigital capacitor. To achieve a compact size, the stepped impedance transmission lines are folded into a right-angled triangle shape. For the ATL, the interdigital capacitor is used to suppress harmonics. By employing two sections of 70.7 Ω ATLs with a right-angled triangle shape to replace conventional transmission lines, the proposed power divider working at 0.9 GHz achieves a size miniaturization with the 58.8% area of a conventional case. In addition, the power divider has good harmonic suppression performance. In the design of a branch-line coupler, two pairs of ATLs with 50 Ω and 35.4 Ω are utilized. For 50 Ω ATLs, the ATLs are designed to a right-angled triangle shape. Meanwhile, to obtain a more compact size, these 35.4 Ω ATLs are modified to an isosceles trapezoid shape. The proposed branch-line coupler operating at 0.9 GHz accounts for merely 33.4% of a coupler adopting conventional microstrip transmission lines. Moreover, the harmonics of a branch-line coupler are suppressed effectively as well. Finally, measured results of the proposed Wilkinson power divider and branch-line coupler display good performance and agree with their simulated results well.

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A Design of Branch-Line Coupler with Harmonic Suppression and Size Reduction Using Closed-Loop and Open-Loop Resonators

Abstract: Abstract. In this paper, a branch-line coupler using closed-loop and open-loop resonators

Cited by 4 publications

References 10 publications

A Dual-Band Branch-Line Coupler with Ultra-Wideband Harmonic Suppression

A Dual-Band Branch-Line Coupler with Ultra-Wideband Harmonic Suppression

Design and fabrication of a novel multilayer bandpass filter with high‐order harmonics suppression using parallel coupled microstrip filter

Compact Microwave Components with Harmonic Suppression Based on Artificial Transmission Lines

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