Abstract
ABSTRACTA one‐third triangular resonator with two electric walls and two virtual magnetic walls is used to realize a compact wideband bandpass filter. This structure is fulfilled by taking out an isosceles or equilateral triangular resonator of substrate integrated waveguide (SIW) version and therefore, it is called one‐third‐mode substrate integrated resonator (OTMSIR). Based on one single cavity, a quadruple‐mode technique is used to design a compact filter by adding an elliptical metallic via‐hole and using detected ground structure (DGS). Finally, a 12.6 GHz bandwidth planar quadruple‐mode filter is fabricated and tested. The measured results agree well with the simulated ones. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1993–1996, 2016
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