Abstract
A triple-band bandpass filter (BPF) using stub loaded quarter-wavelength triple-mode resonators is presented in this letter. Based on the resonance characteristics analysis, it is found that the fundamental mode and the third harmonic in the quarter-wavelength resonator can be independently controlled by the length of quarter-wavelength resonator and the length of short-circuited stub. Furthermore, a new mode is achieved by a novel technique of loading an open-circuited stub on a short-circuited stub. Finally, triple-band BPF is designed, fabricated, and measured to verify the design principle. Good agreement is achieved between the theoretical, simulated and measured results.
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