Abstract

This paper presents a novel band-pass filter with four transmission zeros based on SIW structure. In this structure, we use TE 10d mode and TE 20d mode achieve the typical CT filter that introduces one transmission zero. While coupling microstrip line for source-load coupling will introduce the other three, which is controllable by coupling length and gap. In 8.4GHz band, the filter has return loss more than −20dB, and out-of-band rejection more than −17dB.

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