Abstract
In this brief, a novel tri-band filtering power divider with a pair of out-of-band transmission zeros is presented. It mainly consists of tri-band filter matching structures, transmission lines introducing transmission zeros, and isolation resistors. Through even- and odd-mode analyses, general design equations for the three parts can be derived separately. By applying coupled lines, the circuit size is further compact. For verification, a third-order tri-band filter PD working at three independent bands with a pair of out-of-band TZs θz = 60° is designed. Good agreement between the measured and simulated results is attained so as to successfully validate the correctness of the proposed design approach.
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