Novel Matching Network and Its Application to Quad-Channel Diplexers

Shao, Qiang; Chen, Fu‐Chang; Qian, Jianfeng; Qiu, Jie-Ming; Chu, Qing‐Xin

doi:10.1109/lmwc.2017.2690830

Cited by 14 publications

(5 citation statements)

References 10 publications

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“…Moreover, in Refs. [3][4][5][6], loading additional stubs at the T-type branch can further improve the isolation and input matching of the diplexer or multiplexer for each channel. In addition, introducing extra transmission zeros [7][8][9][10] in the passband of other channel of the diplexer is also a good choice for enhancing its isolation performance.…”

Section: Introductionmentioning

confidence: 99%

“…With the rapid development of the wireless big-datatransmission communication system, it is obvious that handling with the instantaneous broadband process ability in higher frequency, as wide as possible, is the impending demand for the future wireless transceiver (TRx), such as the frequency-division-duplexing (FDD) RF front-end (FEM) for the wideband millimeter-wave (MMW) system. However, the designs of the aforementioned diplexers [3][4][5][6][7][8][9][10] are more appropriate for the narrow-band application scenarios, and their operation passbands are generally set at the lower frequency. Although one channel of the proposed diplexer [11] is featured with wide-passband, the other channel is still designed for narrow-band.…”

Section: Introductionmentioning

confidence: 99%

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Miniaturised high‐isolation K‐/Ka‐band diplexer with 3D antarafacial channel integration using vertical quasi‐coaxial matching network

Zhou,

Wei,

Zhou

et al. 2024

IET Microwaves Antenna & Prop

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A miniaturised high‐isolation K‐/Ka‐band diplexer with exceeding adjacent channels using 3D antarafacial channel integration and vertical‐quasi‐coaxial‐based matching network is proposed. For smaller size, lower loss and lower channel interference, the high‐order low‐pass filter for the K‐band channel and the four‐line‐interdigital‐coupled wideband bandpass filter for the Ka‐band channel are respectively designed on two low‐loss glass‐based substrates, and these two substrates are integrated on the two antarafacial surface of the mounting board. The vertical‐quasi‐coaxial (VQC) embedded in the mounting board is not only used as three‐dimensional (3D) interconnection of the two antarafacial channels but also designed as the constituent part of the matching/isolation network, and this can effectively decrease the impedance traction caused by the Ka‐band filter for the K‐band channel of the diplexer. In addition, four transmission zeros of the K‐band filter are designed at the whole passband of the Ka‐band channel to improve the isolation to the K‐band channel for guaranteeing the performance of the diplexer at the Ka‐band channel. Furthermore, working principle, design method and test solution of this proposed K‐/Ka‐band diplexer are well illustrated, and the high‐isolation (>40 dB) in very adjacent wideband channels at K‐band (18–23.5 GHz) and Ka‐band (25.8–31.6 GHz) is achieved within a tiny size of 9 × 4 × 0.87 mm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Miniaturised high‐isolation K‐/Ka‐band diplexer with 3D antarafacial channel integration using vertical quasi‐coaxial matching network

Zhou,

Wei,

Zhou

et al. 2024

IET Microwaves Antenna & Prop

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“…[1][2][3] The quad-channel diplexer is a good candidate to solve the above problem, and has gained many attentions in the recent years. [4][5][6][7][8][9][10][11] But the quad-channel diplexers in References 4-6 have poor passband selectivity due to the low filtering structure order. The quad-channel diplexer in References 7-9 has the improved passband flatness, but the passband selectivity and the band-to-band rejection are not very high.…”

Section: Introductionmentioning

confidence: 99%

“…The quad‐channel diplexer is a good candidate to solve the above problem, and has gained many attentions in the recent years 4–11 . But the quad‐channel diplexers in References 4–6 have poor passband selectivity due to the low filtering structure order.…”

Section: Introductionmentioning

confidence: 99%

“…In Gorur et al, 10 high isolation and selectivity are achieved in a quad‐channel diplexer, but it has high insertion loss. A very good passband flatness and selectivity has been achieved in Shao et al, 11 but the design of the filtering structure and the matching circuit is actually dependent on each other, which increase the design complexity. Therefore, its physical and electrical performance design with compact circuit, low insertion loss, high isolation, sharp skirts, and flexible passband frequencies is also challenging.…”

Section: Introductionmentioning

confidence: 99%

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Compact quad‐channel diplexer design using dual‐band bandpass filters with multiple transmission zeros

Zhou

et al. 2022

Int J RF Mic Comp-Aid Eng

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This article presents a 0.9/1.23/2.4/3.5 GHz quad-channel diplexer by using a C-section impedance matching circuit to cascade two dual-band bandpass filters (DB-BPFs). Due to the virtual grounds, the canceling effect of mixed electric and magnetic coupling, and the cross coupling, there are six transmission zeros around two passbands, which result in sharp skirts property of DB-BPF. Synthesized step-to-step design process is given to guide the quad-channel diplexer design. Compact circuit area of 0.03396λ g1 2 , low insertion loss of 1.2/0.9/1.2/0.9 dB, sharp skirts and better than 32 dB high port-to-port isolation are also achieved in the proposed quad-channel diplexer design.dual-band bandpass filters, quad-channel diplexer, transmission zeros

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Compact dual‐band inverted‐microstrip ridge gap waveguide diplexer

Wang¹,

Xue

Mao³

et al. 2021

Int J RF Microw Comput Aided Eng

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A compact dual-band inverted microstrip ridge gap waveguide (IMRGW) diplexer composed of four dual-mode IMRGW resonators and an IMRGW T-junction matching network is proposed in this letter. The dual-band diplexer is based on a dual-mode IMRGW resonator which can produce both the inverted microstrip resonant mode and the cavity resonant mode. Two resonant modes of the IMRGW resonator are highly independent, so the passbands of dual-band IMRGW diplexer can be easily tuned to the desired frequencies. A second-order dual-band IMRGW diplexer is designed and simulated. The simulated passbands of the second-order dual-band IMRGW diplexer are 13.

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Novel Matching Network and Its Application to Quad-Channel Diplexers

Cited by 14 publications

References 10 publications

Miniaturised high‐isolation K‐/Ka‐band diplexer with 3D antarafacial channel integration using vertical quasi‐coaxial matching network

Miniaturised high‐isolation K‐/Ka‐band diplexer with 3D antarafacial channel integration using vertical quasi‐coaxial matching network

Compact quad‐channel diplexer design using dual‐band bandpass filters with multiple transmission zeros

Compact dual‐band inverted‐microstrip ridge gap waveguide diplexer

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