X-Band Broadband Branch-Line Coupler with Loose Coupling Utilizing Short-/Open-Circuited Coupled-Transmission Lines

Haoka, Yuya; Kawai, Tadashi; Enokihara, Akira

doi:10.23919/apmc.2018.8617195

Cited by 7 publications

(8 citation statements)

References 7 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%

“…Compared to [22], the proposed coupler provides greater features in terms of return loss/isolation, high-selectivity, transmission zeros, and compact size (73-percent smaller than [22]) except fractional bandwidth. The proposed coupler provides higher bandwidth, high-selectivity, filtering response, and good out-of-band rejection when compared to [24][25][26][27]. The works [28][29][30] report compact BLCs with filtering responses, yet these designs suffer from very narrow bandwidth (< 4%), and inferior stopband level (< 20 dB).…”

Section: Fabrication Results and Discussionmentioning

confidence: 99%

“…In recent years, several new topologies have been employed to realize wideband BLCs with improved performances in terms of bandwidth, compact size, and harmonic suppression [20][21][22][23][24][25][26][27]. In [20], the parallel coupledlines have been attached to each port of the traditional single-section BLC to realize a wideband BLC with improved stopband response.…”

Section: Introductionmentioning

confidence: 99%

“…In [20], the parallel coupledlines have been attached to each port of the traditional single-section BLC to realize a wideband BLC with improved stopband response. The parallel coupled-line has been used extensively in the development of highselectivity bandpass filter [21], filtering phase shifter [23], and matching condition for BLCs [24][25] with improved bandwidth. The double-sided parallel strip-line has been employed to design a filtering 180° coupler in [22].…”

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: 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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“…As shown in Table 3, through literature comparison, the designs in References [4,14,16,17] have rather narrow bandwidth despite very high maximum directivity. The designs in References [12,13,15] have relatively wide bandwidths, but the maximum directivity is relatively smaller. The operating bandwidth of the discrete coding type microstrip directional coupler designed in this paper is about 39.4% and the maximum directivity is 39.3 dB.…”

Section: Performance Comparisonmentioning

confidence: 99%

A broadband loose coupling coupler with discrete structure and hybrid binary particle swarm genetic optimization algorithm

Song

Tian

Zuo

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this paper, a 30 dB broadband microstrip directional coupler is designed by using a discrete coding type coupling structure with a co-simulation technique. Combined with the proposed hybrid binary particle swarm genetic optimization algorithm (HBPSGOA) and the carefully designed fitness function, the discrete coding type structure can provide satisfactory flexibility and excellent performance. For a fixed design space, the discrete space can firstly be encoded and mapped to the corresponding coding matrix, and then the optimal coding matrix searched by HBPSGOA will be used to design a broadband coupler with high directivity. The effectiveness of the proposed HBPSGOA, binary particle swarm algorithm (BPSO), and genetic algorithm (GA) to design a discrete coding type coupler is tested. Experimental results prove that the HBPSGOA pro-

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Wideband directional coupler based on zigzag coupling and wedge structure for isolation enhancement

Wang

Yin

et al. 2022

Int J RF Mic Comp-Aid Eng

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This paper presents the design of wideband directional coupler with enhanced isolation performance. Studies show that introducing the zigzag coupling releases the phase-velocity difference between the even-and odd-mode in the coupling region, thus improving the directivity. To further improve the performance, wedge structure is proposed, and therefore, a wideband coupled-line directional coupler is developed with enhanced isolation responses. The presented coupler characterizes simple architecture, planar layout, symmetric topology, symmetric coupling and isolation responses that are the basic differ-

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X-Band Broadband Branch-Line Coupler with Loose Coupling Utilizing Short-/Open-Circuited Coupled-Transmission Lines

Cited by 7 publications

References 7 publications

Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

A broadband loose coupling coupler with discrete structure and hybrid binary particle swarm genetic optimization algorithm

Wideband directional coupler based on zigzag coupling and wedge structure for isolation enhancement

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