A Bandpass Filter Based on the SISL Technology Using Open Stub and Triangular Resonator

A substrate-integrated suspended line (SISL)-based bandpass filter (BPF) is simulated in the proposed work. One transmission zero (TZ) is introduced in the design using a triangular ring resonator with an open stub. The rejection band is further extended using a pair of square split ring resonators coupled with the main structure. The simulated result of the SISL BPF shows a center frequency of 3 GHz with a 3 dB bandwidth of 462 MHz. The insertion loss at the center frequency is 0.11 dB, and the size of the proposed filter is 22
$\mathrm{x} \ 22 \ \mathrm{x} \ 6 \ {\mathrm{m}}\mathrm{m}^{3}$
, an overall size of 60
$\times 60 \times 6 \ \text{mm}^3$
.