Design of HTS transmit filter using step impedance resonators

作者：Sekiya N^*; Nakagawa Y; Ohshima S

来源：Physica C-Superconductivity and Its Applications, 2010, 470(20): 1503-1506.

DOI：10.1016/j.physc.2010.05.149

• HTS filter
• Transmit filter
• Power-handling capability
• SIR

We have designed a high-temperature superconducting (HTS) transmit filter with step impedance resonators (SIRs). A transmit filter using half-wavelength straight-line resonators requires substantial spacing between adjacent resonators. This means that the filter needs a large substrate and that the number of poles is limited. Using SIRs overcomes this problem because SIRs are compact and have weak coupling. An electromagnetic simulator based on the moment method was used to design the SIR filter, which has a center frequency of 5 GHz and a bandwidth of 120 MHz. Simulation showed that it is approximately 19% smaller than a conventional half-wavelength straight-line resonator filter. Additionally, the maximum surface current is approximately 17% less than that of the conventional filter.

• 出版日期2010-11-1