Bandpass Filters Based on Dual-Mode Slow Wave Substrate Integrated Waveguide Cavities

Xu, Zhixia; Sun, Xiu‐Li; Feng, Yansong; Wang, Zhongbao; Zhong, Wang; Fang, Shaojun

doi:10.1109/lmwt.2023.3279348

Cited by 4 publications

References 21 publications

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A compact half‐mode substrate integrated waveguide bandpass filter based on highly confined slow waves with loading capacitive patches

Wang,

Zhang,

Liu

et al. 2024

IET Microwaves Antenna & Prop

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A novel slow‐wave half‐mode substrate integrated waveguide (HMSIW) bandpass filter (BPF) is proposed based on spoof surface plasmon polaritons (SSPPs) with loading capacitive patches (LCPs). The bandpass characteristics are achieved by etching complementary SSPPs on the metal patches of the HMSIW. SSPPs exhibit a slow‐wave effect, which effectively reduces the overall size of the filter. At the same time, using proper LCPs between the HMSIW metal via and the complementary SSPPs structure, the effective dielectric constant of the HMSIW can be changed, reducing the low cutoff frequency and further facilitating the miniaturisation of size. A prototype of the proposed filter is designed, fabricated, and measured. The measured results show that the proposed filter has the in‐band insertion loss of 1 and 3 dB passband range of 6.4–9.8 GHz.

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A compact half‐mode substrate integrated waveguide bandpass filter based on highly confined slow waves with loading capacitive patches

Wang,

Zhang,

Liu

et al. 2024

IET Microwaves Antenna & Prop

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Compact and miniaturized wideband bandpass filter based on substrate integrated waveguide and microstrip line

Liu,

Yang,

Cai

et al. 2024

Journal of Applied Physics

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In this work, we present a simple design of a compact and miniaturized wideband bandpass filter (BPF) based on substrate integrated waveguide (SIW) and microstrip line. Through the order extension, the filtering effect and the order of the Chebyshev response of the designed BPF can be indirectly controlled by preserving square notches (SNs) on the SIW. By introducing one or two SNs in the SIW structure, the resonance frequencies of different modes can be controlled, thus achieving dual- and tri-mode BPFs with wideband and low insert loss. The working principle of the designed BPFs was illustrated by modal analysis, field distribution, and equivalent circuit theory. Based on this, the dual- and tri-mode BPFs with center frequencies of 6.8 and 7 GHz were designed and demonstrated numerically. Further experimental results indicate that the proposed tri-mode BPF has low insertion loss (0.25 dB), compact size (0.27λg2), and wideband bandwidth (60%). In addition, the tri-mode BPF achieves a broadband out-of-band rejection of 1.5f0 (f0 is the center resonance frequency) below the −10 dB level, making it highly promising for various applications in related fields.

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An SPDT-Switch-Enabled Dual-Band Millimeter- Wave Bandpass Filter for RFFE Applications

Li,

Fang,

Wang

et al. 2023

2023 IEEE 11th Asia-Pacific Conference on Antennas and Propagation (APCAP)

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Bandpass Filters Based on Dual-Mode Slow Wave Substrate Integrated Waveguide Cavities

Cited by 4 publications

References 21 publications

A compact half‐mode substrate integrated waveguide bandpass filter based on highly confined slow waves with loading capacitive patches

A compact half‐mode substrate integrated waveguide bandpass filter based on highly confined slow waves with loading capacitive patches

Compact and miniaturized wideband bandpass filter based on substrate integrated waveguide and microstrip line

An SPDT-Switch-Enabled Dual-Band Millimeter- Wave Bandpass Filter for RFFE Applications

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