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학술지 Design of high-temperature superconducting low-pass filter for broad-band harmonic rejection
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저자
곽민환, Seok Kil Han, 강광용, Dal Ahn, Joom-Suk Suh, Sang Hyun Kim
발행일
200106
출처
IEEE Transactions on Applied Superconductivity, v.11 no.2, pp.4023-4026
ISSN
1051-8223
출판사
IEEE
DOI
https://dx.doi.org/10.1109/77.947378
협약과제
01MB1400, 밀리미터파 고온초전도 믹서, 강광용
초록
The new type of low-pass filter based on a coupled line and transmission line theory is proposed for suppressing harmonies and spurious frequency. The seventh-order coupled-line low-pass filter with strip line configuration was fabricated using a high-temperature superconducting (HTS) thin film on MgO(100) substrate. The seventh-order low-pass filter has five attenuation poles in the stop band. Its cutoff frequency is 1 GHz with a 0.01-dB ripple level. The fabricated filter exhibits a characteristic stop band in the range from 1 to 7 GHz. A measured insertion loss at the pass-band of the HTS low-pass filter is 0.2 dB at 77 K, while the maximum return loss is 17.1 dB. These results match well with those obtained by the EM simulation. The new low-pass filter structure is shown to have attractive properties such as compact size, wide stop band range, and low insertion loss.
KSP 제안 키워드
77 K, Attenuation poles, Broad band, Compact size, Coupled line, Cut-off frequency, EM simulation, Harmonic Rejection, High-temperature superconducting, Maximum return, Pass-band