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A compact ultra-wideband (UWB) bandpass filter (BPF) using microstrip and coplanar waveguide (CPW) back-to-back coupled structure is proposed. First, the detached-mode resonator on the CPW layer is formed to allocate three resonant frequencies to meet the concern of UWB operation. Then, microstrip and CPW back-to-back coupled structure is introduced to achieve the UWB limit. To further improve the...
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