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A four-pole tri-band bandpass filter (BPF) is designed with stub-loaded resonators (SLRs). The SLR is constructed by a double spiral structure (DSS) loaded with two folded T-shape stubs at the midpoint. A tri-feeding structure is proposed to meet the required external couplings of the three passbands simultaneously. The center frequencies and bandwidths of the three passbands can be independently...
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