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Design of high-temperature superconducting low-pass filter for broad-band harmonic rejection
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- Authors
- Min Hwan Kwak, Seok Kil Han, Kwang-Yong Kang, Dal Ahn, Joom-Suk Suh, Sang Hyun Kim
- Issue Date
- 2001-06
- Citation
- IEEE Transactions on Applied Superconductivity, v.11, no.2, pp.4023-4026
- ISSN
- 1051-8223
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- 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 Keywords
- 77 K, Attenuation poles, Compact size, Coupled line, EM simulation, Harmonic rejection, Low pass filter(LPF), Maximum return, Pass-band, Return Loss, Strip line