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In this letter, a four‐pole balanced frequency‐agile bandpass filter (BAL‐FA‐BPF) with constant absolute bandwidth (CABW) and four transmission zeros (TZs) is reported. This design is based on the advanced coupling matrix technique which ensures the realization of CABW for the filter. The fully‐canonical coupling topology with cross‐coupling and source‐load coupling is adopted, which introduces four...
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