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Dual‐to‐quad‐band evanescent‐mode substrate‐integrated waveguide band‐pass filters

2020; Institution of Engineering and Technology; Volume: 14; Issue: 11 Linguagem: Inglês

10.1049/iet-map.2020.0371

1751-8733

Amir Nosrati, Mahmud Mohammad‐Taheri, Mehdi Nosrati,

Radio Frequency Integrated Circuit Design

A new design methodology is presented for multi-band evanescent-mode band-pass filters (BPFs) realisation by integrating substrate-integrated waveguide structure with multiple short-circuited irises. The electro magnetic (EM)-behaviour of the distributed-element structure is modelled with the lumped-element equivalent circuit in a wide frequency range. Arbitrary transmission poles (TPs) and transmission zeros (TZs) corresponding to the different irises are characterised. Moreover, a rigorous prescribed filtering function is developed to design dual-band evanescent-mode BPFs in terms of independently tunable TPs and TZs. The proposed structure is reported to not only demonstrate miniaturised high quality-factor dual-band BPFs but also obviate the design challenges of multi-band BPFs below the cut-off frequency. Furthermore, two triple- and quadruple-band evanescent-mode BPFs are experimentally examined for the proposed concept verification.