Abstract
In this pater, a novel substrate-integrated waveguide (SIW) square cavity dual-mode filter is proposed. By using an orthogonal input and output feed-line and two tuning metal vias for disturbing two degenerate modes, a transmission zero is derived. A SIW dual-mode filter with the center frequency of 14.7 GHz was fabricated and measured, in which fractional bandwidth is 3.8%. The measured results show good agreement with the simulated ones and validate the structures of the dual-mode filters.
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