Abstract

A novel third-order substrate integrated waveguide (SIW) filter incorporated with a coplanar waveguide (CPW) is presented in this paper. The CPW not only acts as a resonator, but also brings mixed coupling between two SIW resonators. It is shown that the filter has two transmission zeros and wide stopband, which is very compact in comparison with conventional third-order SIW counterpart. Good agreement is obtained between its measured and simulated S-parameters.

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