In this paper, new design concept of nonorthogonal input and output (I/O) ports applied to optimize dual-mode bandpass ring filter is proposed. Compared to conventional dual-mode filters, the proposed filter with nonorthogonal I/O could not only support two degenerate modes operation, but also Increase design flexibility. Moreover, the design of dual-mode filters would not have an I/O geometry limitation, corresponding to high integration. Finally, a simple structure and high selectivity for the dual-mode bandpass filters were obtained.
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