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Compact dual-band bandpass filters (BPFs) are proposed using the novel embedded spiral resonators (ESRs) in this letter. Each ESR consists of two sets of spiral-lines embedded in a microstrip rectangular open-loop (MROP). The resonator has two functions in the filter: 1) dual-resonance operation mainly provided by the spiral-lines is employed to generate two passbands simultaneously. 2) MROP acting...
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