论文信息 - Compact superconducting lowpass filter with wide stopband

Compact superconducting lowpass filter with wide stopband

A compact superconducting lowpass filter (LPF) composed of a pair of symmetrical parallel coupled lines, a cross-shaped patch and a modified E-type feeding structure is proposed. The filter is successfully designed and fabricated on MgO substrate with a compact size of 10.0 × 15.0 mm. Measured results match well with simulation results. The LPF has a 3 dB cut-off frequency of 2.18 GHz, relative stopband bandwidth of 160%, and 0.06 dB insertion loss in the passband. For attenuation level of -18.5 dB, stopband bandwidth is from 3.16 to 19.25 GHz.

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