Miniaturized Sixteenth-mode Substrate Integrated Waveguide Bandpass Filter with Slot Line Array

A sixteenth-mode substrate integrated waveguide (SIW) bandpass filter with slot line array is proposed in this paper. As the slow wave performance of the slot line array, the circuit size of the proposed bandpass filter is further reduced about 23% comparing with the traditional sixteen-mode one. The simulated and measured results illustrate that the operating frequency is from 1.92 GHz to 2.10 GHz with 9% bandwidth. The return loss at the central frequency is lower than 20 dB while the minimal insertion loss is 0.55 dB.