A compact wideband harmonic suppressed 10 dB branch line coupler using cascaded symmetric PI sections

Barik, Rusan Kumar; Kumar, Kanaparthi V. Phani; Karthikeyan, S. S.

doi:10.1002/mop.29870

Cited by 10 publications

(8 citation statements)

References 8 publications

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“…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%

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: Introductionmentioning

confidence: 99%

Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

2022

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“…Thus, couplers with harmonic suppressions are emerged. [23][24][25][26] In References 23, a wideband harmonic suppressed 10 dB BL coupler using cascaded symmetric PI sections is presented. Owning to the cascading and PI sections, the bandwidth reaches 52%, and up to 4th harmonic is suppressed.…”

Section: Introductionmentioning

confidence: 99%

Compact wideband and harmonic suppressed quadrature coupler using susceptance loaded coupled lines

Liu

Guan

Zhang

et al. 2021

Micro & Optical Tech Letters

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In the paper, a novel type of quadrature coupler with the features of wideband, arbitrary harmonic suppression and small size is proposed, for the first time, by employing susceptance loaded coupled lines. Design equations are derived using the even-odd mode decomposition analysis. The discussions on arbitrary couplings and harmonic suppressions are also investigated. For demonstration, a prototype with a second harmonic suppression was fabricated and measured. The overall size is 0.19λ g Â 0.27λ g , which is smaller than most of the reported wideband quadrature couplers. Measurement results show that the fractional bandwidth of 40% is obtained under the condition of 15-dB return loss/isolation, 1-dB amplitude imbalance, and 90 AE 5 phase difference. The proposed coupler can be a good candidate for wideband applications without using the multi-cascading and complex miniaturization method.

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“…7 The cascade technique is commonly used in the branch line coupler which operates at a single band. 10,11 However, in this work, the designs have wide bandwidths at dual operating bands with the application of cascade technique. Different from the common designs which put emphasize on extending the bandwidth of a single band, the proposed coupler represents the attempt to broaden the bandwidth of each frequency band.…”

Section: Introductionmentioning

confidence: 99%

“…This letter describes a coupler with wide‐band and dual‐band characteristics that is designed by combining the cascade technique with a cross coupled branch‐line coupler 7 . The cascade technique is commonly used in the branch line coupler which operates at a single band 10 , 11 . However, in this work, the designs have wide bandwidths at dual operating bands with the application of cascade technique.…”

Section: Introductionmentioning

confidence: 99%

A dual‐band and wide‐band branch‐line coupler with a large frequency ratio

Jia

Zhang

2020

Micro & Optical Tech Letters

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This article presents a dual-band and wide-band branchline coupler with a large frequency ratio. By combining the cascade technique with cross coupled branch lines, the proposed coupler can acquire the function of wideband and dual-band. Furthermore, the proposed coupler can realize a large frequency ratio of 2.6 due to the new structure. For experimental verification, both the simulation and measurement results of the proposed coupler designed to operate at 1 and 2.6 GHz are presented. The measured results validate good dual-band performance with enhanced bandwidths (1 dB imbalance) up to 34.7% and 14.9%, respectively.

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A compact wideband harmonic suppressed 10 dB branch line coupler using cascaded symmetric PI sections

Cited by 10 publications

References 8 publications

Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

Compact wideband and harmonic suppressed quadrature coupler using susceptance loaded coupled lines

A dual‐band and wide‐band branch‐line coupler with a large frequency ratio

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