A novel slow‐wave half‐wavelength coplanar waveguide (CPW) resonator using high‐Tc superconducting (HTS) films has been studied and used in a new filter topology. The slow‐wave effect is achieved by the capacitively loaded structure with a symmetrical interdigital line loaded on both sides of the central line. The velocity reduction (Vp/c0) of the resonator is about 0.050. A three‐pole Butterworth bandpass filter has been designed and fabricated with the use of the resonator.
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Zhou et al. (2002) studied this question.
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