Ultra‐compact highly selective quasi‐elliptic filters based on combining dual‐mode SIW and coplanar waveguides in a single cavity

• DOI: 10.1049/iet-map.2017.0516
• Publication Date: 2017-11-03T04:10:16Z
• Authors: Qing Liu; Dongfang Zhou; Dalong Lv; Dewei Zhang; Yi Zhang
• Keywords: Coplanar waveguide

Two bandpass filters (BPFs) are implemented on a single dual‐mode square‐shaped substrate‐integrated waveguide (SIW) cavity with two etched coplanar waveguides. The proposed BPFs can achieve transmission zeros (TZs) using dual modes in the SIW (i.e. TE 102 and 201 ) non‐resonating mode fundamental 101 ), which provides direct input‐to‐output coupling. Moreover, positions of TZs be tuned by changing input output ports. an extra TZ controllable position is also achieved electric magnetic mixed coupling; split into for cross‐coupling paths. improve selectivity out‐of‐band rejection. designed have centre frequency 5.8 GHz. measured results agree simulated ones.