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A dual-mode dual-band bandpass filter with two transmission poles in both of dual-passbands is presented with the proper stub-loading and external-excitation of a single microstrip ring resonator. By placing two excited ports at the 135??-separated positions along a uniform ring resonator, two 1st-order degenerate modes, TM10 and TM01, can be simultaneously excited and they are split to produce two...
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