Miniaturized trisection BPF design using size-reduced substrate integrated coaxial resonators

The contribution of this work is to propose miniaturized trisection bandpass filters (BPFs) using size-reduced substrate integrated coaxial resonators (SICRs). The applied SICRs are operated under a coaxial mode. The occupied circuit area of the SICR developed from its structurally similar one, the substrate integrated waveguide (SIW) cavity, is only 6.2% that of the latter, corresponding to a circuit-area reduction rate of 93.8%. The cross-coupling between the input and output resonators can be either a magnetic or electric coupling for locating the transmission zero near either the upper or lower passband edge, respectively. Sample trisection BPFs with magnetic/electric cross-couplings are built for experimental verification. Agreements between measured and simulated data are observed. These miniaturized trisection BPFs with a freely switchable transmission zero are endowed with the advantage of an excellent circuit-area efficiency in the category of SICR and SIW cavity trisection BPFs.

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Substrate Integrated Waveguide Bandpass Filters in Box-Like Topology With Bypass and Direct Couplings in Diagonal Cross-Coupling Path

IEEE Transactions on Microwave Theory and Techniques ◽

10.1109/tmtt.2018.2889450 ◽

2019 ◽

Vol 67 (3) ◽

pp. 1014-1022 ◽

Cited By ~ 5

Author(s):

Qing Liu ◽

Dongfang Zhou ◽

Yi Zhang ◽

Dewei Zhang ◽

Dalong Lv

Keyword(s):

Cross Coupling ◽

Bandpass Filters ◽

Substrate Integrated Waveguide ◽

Coupling Path

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Substrate Integrated Waveguide Multiband Bandpass Filters and Multiplexers

10.1109/imfw49589.2021.9642341 ◽

2021 ◽

Author(s):

Kang Zhou ◽

Ke Wu

Keyword(s):

Bandpass Filters ◽

Substrate Integrated Waveguide

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Compact triple‐mode bandpass filters based on single perturbed substrate integrated waveguide cavity using coaxial feed

Microwave and Optical Technology Letters ◽

10.1002/mop.33073 ◽

2021 ◽

Author(s):

Yulin Feng ◽

Shaojun Fang ◽

Leitao Zhou ◽

Qiuyi Zhang ◽

Zhixia Xu

Keyword(s):

Bandpass Filters ◽

Substrate Integrated Waveguide ◽

Coaxial Feed ◽

Triple Mode

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A compact, broadband three-way substrate integrated waveguide power divider with improved isolation

Circuit World ◽

10.1108/cw-04-2020-0074 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Arun Kumar Gande ◽

Souma Guha Mallick ◽

Bijit Biswas ◽

Sayan Chatterjee ◽

Dipak Ranjan Poddar

Keyword(s):

Return Loss ◽

Power Divider ◽

Substrate Integrated Waveguide ◽

Fractional Bandwidth ◽

Coupling Region ◽

Content Type ◽

Power Dividers ◽

Power Coupling ◽

Input And Output ◽

Input Matching

Purpose This paper aims to present a compact, broadband substrate integrated waveguide (SIW) three-way power divider with improved isolation based on six-port SIW coupler. Design/methodology/approach The power coupling among the three output ports occurs due to short openings in the narrow walls of the central SIW channel. Performance improvement in the isolation and return loss among ports is achieved using matching posts placed at the input and output ends of the coupling region. This enhances the coupling between TE10 and TE30 modes. The input matching ports enhance the return loss, whereas the isolation is alleviated by both the input and output matching posts. The bandwidth enhancement is achieved by optimizing the outer SIW channel widths. Findings The measured fractional bandwidth of 27.3% with over 15 dB of isolation and return loss is achieved. The coupling length is 1.55 λg at the centre frequency. The power divider achieves better than 15 dB isolation between non-adjacent output ports. The measured reflection and isolation coefficients are in close agreement with simulated results over 8.2 to 10.8 GHz. Practical implications Isolation between the adjacent and non-adjacent ports is an important parameter as the reflections from these ports will interfere with signals from other ports reducing the fractional bandwidth of the power divider and affecting the overall performance of the transmitters and receivers. Originality/value The authors present the enhancement of isolation between the output non-adjacent ports by optimizing the SIW channel width and matching post in the coupling region to reduce the reflected signals from non-adjacent ports entering into other ports. To the author’s knowledge, this is the only SIW three-way power divider paper showing non-adjacent port isolation among six-port couplers based three-way power dividers.

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