Defected Ground Structure Coupled Miniaturized Dual-Mode Square Patch Bandpass Filter
نویسندگان
چکیده
This paper presents design of a defected ground structure coupled miniaturized dual-mode bandpass filter realized using a square patch. Two slots orthogonal to each other are cut on the patch to increase the path length of the fundamental mode while keeping the second mode current path almost unaffected. An inclined aperture cut on the ground plane right beneath the center of the patch is used to couple the two degenerate modes of the patch. The measured filter has a 3 dB fractional bandwidth of 21.7 % at 1.29 GHz. It’s 58% smaller than a square patch filter.
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