QMSIW-Based Single and Triple Band Bandpass Filters

A compact tri‐band filter based on a dual‐capacitively loaded triple‐mode substrate integrated waveguide resonator

“…The proposed tri-band filter achieves much size reduction than Zhang and colleagues. 1,[4][5][6][7][8] Filters in Zhang et al 2 and Iqbal et al 3 achieve better miniaturization than our work. However, the filters in Zhang et al 2 and Iqbal et al 3 are not suitable for millimeter wave implementations and 3D-integrated systems, for the lacking of EM-shield capability and use of lumped capacitors.…”

“…Etching slots, loading inductive posts, and loading capacitive structure are three main methods to realize the mode control of MMRs. [1][2][3][4][5][6][7][8] In Zhang et al, 1,2 tri-band filters are designed based on complementary split ring resonators loaded SIW cavity. However, the slots etching on the surface of SIW may cause significant radiation loss and thus the circuit is suitable only for lower microwave frequencies.…”

“…Multimode resonators (MMRs) have gained a considerable amount of research interest owing to their compact size in designing multiband SIW filters. Etching slots, loading inductive posts, and loading capacitive structure are three main methods to realize the mode control of MMRs 1–8 . In Zhang et al, 1 , 2 tri‐band filters are designed based on complementary split ring resonators loaded SIW cavity.…”

“…However, the slots etching on the surface of SIW may cause significant radiation loss and thus the circuit is suitable only for lower microwave frequencies. In Iqbal et al, 3 an ultraminiaturized triple band filter is designed with quarter‐mode SIW, etching slots, and lumped capacitors. Although ultracompact size is achieved, etching slots on the SIW surface, meaning the integrity of the electric and magnetic (EM) shield capability of SIW is damaged, and the utilization of lumped components limit its implementation in higher microwave and millimeter wave frequencies and 3D‐integrated systems 9 .…”

Miniaturized dual‐band ridged substrate integrated waveguide cavity resonator and band‐pass filters

“…However, the ratio of the two resonant frequencies cannot be adjusted independently, and the dimensions of BPF designs above are relatively large. Some miniaturized methods have been reported for the SIW filters, including half-mode SIW (HMSIW) and quarter-mode SIW (QMSIW) filters, [11][12][13][14][15] etching the complementary split-ring resonators (CSRRs), defected ground structure (DGS). [16][17][18][19] The major disadvantage of these miniaturization methods is generating the extra radiation loss, especially in the high frequency bands.…”