Abstract
AbstractIn this brief, a filtering power divider (FPD) with independently controllable four transmission zeros (TZs) and low insertion loss is designed and analyzed by using quad‐mode ring‐loaded resonator (QMRLR). The equivalent circuit of the proposed FPD is given, and the resonant characteristics of the resonator are analyzed. Due to the horizontal transmission interference of QMRLR, two TZs are realized. In addition, two TZs and one transmission pole are achieved by stepped impedance lines, achieving high selectivity within the passbands. The insertion loss is less than 0.5 dB, which is better than other FPDs. For demonstration, a prototype with center frequencies at 1.45 and 2.75 GHz is fabricated and measured. The measured and simulated results are presented with good agreement.
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