Abstract
This letter presents a novel high-temperature superconducting (HTS) band-pass filter with a very wide stopband using the method of staggered resonant modes, that is, dissimilar resonators with the same fundamental frequency but different harmonic frequencies. A new type of resonator that is suitable for this method is proposed. The design rules and design process of this method are analyzed in detail. A six-pole HTS band-pass filter centered at 500MHz with a 2MHz bandwidth is successfully designed and fabricated. Measured out-of-band rejection is better than 60dB and can reach up to 13GHz, which is about 26 times the fundamental frequency.
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