A Branch Line Coupler with improved stopband and miniaturized size for L-band applications

Abbasi, Hamed; Shama, Farzin

doi:10.1016/j.aeue.2020.153208

Cited by 9 publications

(4 citation statements)

References 17 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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“…Recently, the development of the miniaturized devices such as couplers, divider/combiners, phase shifters, switches, and so forth, in numerous fields of the wireless communication is charming topic for the solid‐state electronics 1 . Branch‐line coupler (BLC) is one of a key component that is used in the communication systems 2 . In addition, BLC is a special sort of 90° hybrid coupler that has become one among the foremost utilized in miscellaneous microwave frequency applications due to being simply, low‐loss and low‐cost 3 .…”

Section: Introductionmentioning

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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“…The conventional branch-line coupler equally divides the power between its two outputs with a phase difference of 90°. However, it suffers from narrow bandwidth characteristics (< 20%) when it consists of a single-section design [8][9][10], and it requires a large circuit area when multiple sections are implemented [11].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Miniaturized Wideband Branch-Line Coupler Using Shunt Open-Stubs and Meandering Technique

Kumar

Alazemi²

2021

IEEE Access

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This article presents a flexible miniaturized wideband branch-line coupler printed on a biodegradable paper substrate. The proposed design consists of a combination of series transmission lines and shunt open-stubs along with the meandering technique as a substitute to the conventional quarterwavelength transmission line (QWTL). The horizontal QWTLs of the traditional three-section branch-line coupler are replaced by a proposed equivalent structure, and the vertical QWTLs have been meandered. The developed prototype occupies an area of 0.04 λg 2 , and it has been tested where the measurements agree well with the simulations, and the obtained fractional bandwidth is greater than 60% at 0.9 GHz operating frequency. In addition, for flexibility analysis, the prototype is bent in different directions, and the tested results are obtained and compared to the flat design. The proposed device can be used in antenna feeding networks, microwave and conformal applications that require both compact size and frequency wideband response simultaneously.

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A Branch Line Coupler with improved stopband and miniaturized size for L-band applications

Cited by 9 publications

References 17 publications

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

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

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

A Flexible Miniaturized Wideband Branch-Line Coupler Using Shunt Open-Stubs and Meandering Technique

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