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In this article, a narrow‐bandwidth duplexer with a triple‐split ring resonator (T‐SRR) using mu‐negative metamaterial is presented. The T‐SRR not only has negative permeability at the operating frequency band but also flexibility in size adjustment. The experimental results for insertion and return losses are 1.33 and 16.1 dB with a bandwidth of 10% at a RX center frequency of 8 GHz, and they are...
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