A Compact Triple-Mode Filter with Y-Type Stepped-Impedance Stub (Y-SIS) for PCS and WiMAX Applications

A compact planar dual-band bandpass filter (BPF), which consists of a hexagon resonator and a Y-type stepped- impedance stub (Y-SIS), is introduced. The Y-SIS, acting as an effective perturbation element with two functions, could excite a new mode, and split the second-order degenerate modes of hexagon resonator to form the second passband with three visible transmission poles, simultaneously. The proposed BPF is designed, fabricated and tested. The measured results, in good agreement with the simulation values, demonstrated that the proposed filter is quite suitable for PCS and WiMAX applications.

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