Design of Broadband Doubly Asymmetrical Branch-Line Directional Couplers

Buesa-Zubiria, Ana; Esteban, Jaime

doi:10.1109/tmtt.2019.2953904

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…The proposed filtering BLC exhibits superior performance when compared to the state-of-the-art circuits [1][2], [11][12][13][14][15], [17], [19][20], [22], and [24][25][26][27][28][29][30] as indicated in Table I. In particular, our FBLC achieves the highest bandwidth with a larger number of transmission zeros, along with wide stopband characteristics except [22].…”

Section: Fabrication Results and Discussionmentioning

confidence: 99%

“…A number of techniques have been developed to achieve larger bandwidth, harmonic suppression, arbitrary power division, compact size, multiband operation, and filtering response . For example, bandwidth enhancement can be obtained by attaching impedance transformers to each port of the single-section BLC [1][2][3], utilization of two-section/three branch-line topologies [4][5][6][7][8][9][10], but also three-section/four branch-line topologies [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…To implement the suppression, various equivalent circuits of 90-degree lines, such as L-shaped and open-ended stub [1], multiple πshaped [3], open stub [7], unequal-length open stub [14, and coupled-line and open stub [16], [18], have been suggested. It should also be emphasized that wideband BLC topologies reported in [2], [4]- [6], [8][9][10][11][12][13], [15], [17], and [19], are not suitable to suppress the harmonics.…”

Section: Introductionmentioning

confidence: 99%

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Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

2022

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This paper presents a novel design of a wideband highly-selective bandpass filtering branchline coupler (FBLC). By integrating a coupled microstrip line, and an open-ended stub at each port of a single-section BLC, bandpass filtering characteristics with excellent selectivity and broad operating bandwidth have been achieved. The proposed circuit has been verified through EM simulations and physical measurements of the fabricated prototype. Experimental results demonstrate over 71-percent fractional bandwidth (2.25 GHz to 4.74 GHz) with a power imbalance lower than 0.5 dB. At the same time, the measured return loss and isolation are better than 15dB with the phase imbalance of 5 ± 5°. This level of performance, especially in terms of bandwidth and selectivity, has not been reported in the literature thus far.INDEX TERMS Branch-line coupler, bandpass filtering, highly-selective, coupled-line.

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Section: Fabrication Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

2022

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“…By using an Eshaped network in place of branch lines, the dual-band coupler is created [3]. The designed branch-line coupler has different impedances at its input and output by using two different asymmetries: the inputoutput asymmetry and the up-down asymmetry [4]. The coupler is designed using a dual-band quarter wave TL structure, which can perform wide frequency ratio operation, but its isolation and return loss need to be improved [5].…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of a Tri-Band Coupler for RF Applications

Ganesan,

Durairajan,

Srinivasan

et al. 2023

Advances in Computer Science Research

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The Branch Line Coupler is a four-port network which can divide an input signal into two equalpower with 90 o phase difference. This paper presents the design and analysis of a tri-band Coupler. The proposed coupler is operating at frequency ranges of 1.9 / 3.6 / 5 GHz with output ports at 3 dB. The Advanced Design System (ADS) software is used to simulate this tri-band coupler. The Flame Retardant-4 (FR-4) substrate material is used to design this coupler. The proposed triband coupler measures 98.3 mm × 30 mm in size. The proposed coupler is designed for L, S, and C bands. Index terms-tri-band, microstrip line, branch line coupler (BLC)

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“…13 Therefore, CPW technology receives enhanced attraction to develop a low-cost miniaturized CPW microwave components for the sake of having simple integration to the solid-state devices. 14 Furthermore, a variety of the mBLC designs have been reported in the literature that have been developed by the folded transmission lines, 15 fractal, 16 lumped elements, 17 slow-wave structures, 18 open stubs, 19 and asymmetric structures 20 on the printed circuit boards (PCBs). However, a variety of the proposed mBLCs are unsuitable for high frequency and high-power applications.…”

mentioning

confidence: 99%

A novel miniaturizedX‐bandcoplanar waveguidebranch‐linecoupler using T‐ and 𝜋‐type equivalent transmission lines

Arican

Sen

Turhan‐Sayan

2022

Int J RF Mic Comp-Aid Eng

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This article reports a novel compact branch‐line coupler (BLC) in coplanar waveguide technology for X‐band monolithic microwave integrated circuit (MMIC) applications. This article consists of theoretical basis, design, and measurement results of the developed miniaturized BLC. In this study, the theoretical basis of the miniaturized BLCs were analyzed and the T‐ and π‐type equivalent transmission line approaches and meandering technique were utilized to significantly miniaturize the conventional BLC. The proposed BLC was manufactured with gallium nitride MMIC technology. The manufactured BLC has a return loss of better than −12 dB over 8.5–11.1 GHz which yields a 26.8% bandwidth. In addition, the insertion losses |S21| and |S31| were measured as −3.5 dB and −3.6 dB at 9.6 GHz. Moreover, the phase difference between the output ports were 90° ± 5° over the frequency bandwidth of 9.2–11.6 GHz. Furthermore, the proposed BLC has a size of 3.9 mm2 (0.152λ × 0.156λ) and this achieves 62% size reduction with respect to the conventional BLC design. The developed novel miniaturized BLC can be utilized in the X‐band applications.

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Design of Broadband Doubly Asymmetrical Branch-Line Directional Couplers

Cited by 6 publications

References 31 publications

Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

Design and Performance Analysis of a Tri-Band Coupler for RF Applications

A novel miniaturizedX‐bandcoplanar waveguidebranch‐linecoupler using T‐ and 𝜋‐type equivalent transmission lines

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