Synthesis of miniaturized filtering coupled‐line trans‐directional coupler with wide suppression band

Liu, Hongmei; Li, Xiaoting; Wang, Jiahui; Fang, Shaojun; Wang, Zhongbao

doi:10.1002/mmce.22869

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…To further demonstrate characteristics of the proposed filtering TRD coupler, Table 4 summarizes the comparison between the proposed filtering TRD coupler with the reported filtering couplers. Compared with the filtering TRD couplers in References 14 and 15, the proposed coupler has a relatively compact configuration, wider passband and the function of the input‐reflectionless feature.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the rat-race coupler, the transdirectional (TRD) coupler has advantages including smaller footprint, wider bandwidth, tighter coupling and inherent DC-blocking. [11][12][13][14][15] To the best of authors' knowledge, there are few works focus on the filtering TRD coupler. In References 14 and 15, filtering TRD couplers are proposed with extra sub-circuits loaded at four ports.…”

Section: Introductionmentioning

confidence: 99%

“…However, the circuit size is greatly enlarged by introducing filtering absorptive sections. Compared with the rat‐race coupler, the trans‐directional (TRD) coupler has advantages including smaller footprint, wider bandwidth, tighter coupling and inherent DC‐blocking 11–15 . To the best of authors' knowledge, there are few works focus on the filtering TRD coupler.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of authors' knowledge, there are few works focus on the filtering TRD coupler. In References 14 and 15, filtering TRD couplers are proposed with extra sub‐circuits loaded at four ports. Unfortunately, these designs are complex with enlarged circuit size, and transmission zeros (TZs) and filtering bandwidths are difficult to control, and the input‐reflectionless feature is neglected.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Miniaturized filtering trans‐directional coupler with enhanced input‐reflectionless feature using two types of coupled multi‐line sections

Zhang

Wang

2022

Int J RF Mic Comp-Aid Eng

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This paper presents a miniaturized filtering trans-directional (TRD) coupler with enhanced input-reflectionless feature. Coupled two-line and three-line sections are loaded at through and coupled ports of a basic TRD coupler to realize the filtering performance. The basic TRD coupler based on a periodically loaded coupled-line (CL) can be independently designed to realize tight coupling degree and wideband bandwidth. Coupled three-line structure has been applied to obtain a higher coupling factor and wider bandwidth in various components. Since the coupled multi-line sections exhibit open-circuit at f 0 , by selecting the appropriate coupling coefficient and type of coupled multiline sections, the filtering bandwidth and transmission zeros (TZs) can be independently controlled. Moreover, the input-reflectionless feature can be realized by the signal-interference of the reflected stop-band signals of two output ports. Explicit equations and limitations of implementations are derived and discussed. Two 3-dB prototypes are designed and built to verify the design theory.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Miniaturized filtering trans‐directional coupler with enhanced input‐reflectionless feature using two types of coupled multi‐line sections

Zhang

Wang

2022

Int J RF Mic Comp-Aid Eng

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Synthesis of Four‐Coupled‐Line Based Wideband Coupler With Inherent Filtering Feature and Its Modification

Zhang,

Liu,

Zhang

et al. 2024

Micro & Optical Tech Letters

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In the paper, a compact wideband filtering quadrature coupler is proposed, which utilizes the inherent filtering feature of the unequal‐width four‐coupled‐line (FCL) for the first time. Simply by assigning four terminals of the FCL as open‐circuited, the functions of power division, quadrature phase, and inherent filtering response are obtained simultaneously within a wideband. It also has the merits of high directivity and low insertion loss. Since the proposed FDC has the inherent filtering feature without adding extra resonators, the size is the smallest (0.29λg × 0.13λg), and the structure is the simplest when compared with state‐of‐the‐art wideband FDCs. Moreover, based on the derived universal impedance matrix of the unequal‐width FCL, the FCL‐based coupler, as well as other multiport circuits, can be theoretically analyzed. For validation, a prototype is implemented. Measurements show that the proposed coupler exhibits a bandwidth of over 45% under the conditions of 10‐dB return loss, 10‐dB isolation, 0.5‐dB amplitude imbalance, and 5° phase difference error. Besides, the stopband rejection is more than 15 dB, and the rectangle coefficient (RC = |BW20 dB/BW3 dB|) reaches 1.74. Further, as a modification, the high‐frequency selectivity characteristic (RC = 1.11) can be obtained by simply inserting λ/2 stepped impedance resonators with less influence on in‐band performance and little increase in size.

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Filtering coupler with tight coupling based on trans-directional coupler

Cao,

Gu,

Yin

et al. 2024

J. Phys.: Conf. Ser.

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In the text, a filtering trans-directional coupler is designed. This structure consists of three coupled lines, resonant circuits, and a trans-directional coupler. The filtering function is achieved through three coupling lines, and resonant circuits play a role in eliminating resonance points. A 3-dB filtering coupler with tight coupling characteristics is designed. When S11<-10 dB, the relative bandwidth in simulation can reach 48.59% (2.15 GHz ∼ 3.53 GHz). Moreover, the filtering trans-directional coupler has the characteristic of a wide stopband. Under the standards of |S11| and |S21| less than -10 dB, the cutoff frequency of the upper stopband is 7.23 GHz.

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Synthesis of miniaturized filtering coupled‐line trans‐directional coupler with wide suppression band

Cited by 5 publications

References 28 publications

Miniaturized filtering trans‐directional coupler with enhanced input‐reflectionless feature using two types of coupled multi‐line sections

Miniaturized filtering trans‐directional coupler with enhanced input‐reflectionless feature using two types of coupled multi‐line sections

Synthesis of Four‐Coupled‐Line Based Wideband Coupler With Inherent Filtering Feature and Its Modification

Filtering coupler with tight coupling based on trans-directional coupler

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