Abstract
A novel compact quad-band bandpass filter (BPF) using a single stepped-impedance ring loaded resonator (SIRLR) is introduced. Different from other multi-mode resonators proposed recently, the SIRLR generates two transmission poles (TPs) on each passband of the BPF so that a quad-band BPF can be realised using only one resonator. Due to the multipath structure, three transmission zeros (TZs) are created between passbands, resulting in the improvement of band-to-band isolation. TPs and TZs are carefully controlled and adjusted by tuning electric length and impedance of the SIRLR to satisfy the demands of proposed quad-band BPF. The proposed filter was fabricated and just occupied 0.18λ g × 0.15λ g. The results of simulations and measurements agree very well.
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