A microstrip dual‐mode bandpass filter (BPF) using a circular patch resonator is investigated in this paper. Unlike the conventional dual‐mode patch‐resonator bandpass filter studied in the literature, the introduced filter is perturbed by one circular hole in the northeast area of the patch. The filter has a simple topology and can implement elliptic‐function response characteristics. An experimental filter is optimally designed and fabricated, for the first time, in order to demonstrate the idea. Both the calculated and measured results are presented.
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Li et al. (2005) studied this question.
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