Abstract
In this paper, a quadri-folded substrate integrated waveguide (QFSIW) resonant cavity is proposed and investigated for the flrst time, which is able to reduce the circuit size by 89% compared with the conventional substrate integrated waveguide (SIW) resonant cavity. It has a two-layer conflguration and a C-type coupling slot etched on the middle conductor layer. As an example, such a miniaturized resonant cavity is employed in the design of a four-order S-band SIW bandpass fllter with the Chebyshev response. Negative couplings are used between two adjacent SIW resonant cavities, which don't in∞uence the whole transmission characteristic of the fllter. Experimental results are in good agreement with those from simulations.
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