Study for the design of 30GHz HTS-CPW type BPF using λ/4 resonator

摘要

30GHz HTS-CPW type 4-pole BPF using λ/4 resonators, which has been presented, was manufactured on the YBCO thin film and measured by 50K. The measured result does not agree with the calculated result. The wrong parts of the filter pattern made with manufacture precision were examined by using the circuit simulator ADS. As a result, it is found that the element value of the inter-digital gap structure used for the input-and-output part differs from the designed value, and required manufacture accuracy is not acquired. Then, 30GHz HTS-CPW type 4-pole BPF using λ/4 resonators were designed in consideration of the kinetic inductance by using T-form opening gap which made transmission line width larger than the usual one. Furthermore, 8-pole BPF of the same specification was designed.