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Dual-band HTS filter using modified dual-spiral resonators

Dual-band HTS filter using modified dual-spiral resonators

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A symmetric dual-band filter with a centre frequency of 887 MHz is presented. The filter uses a modified structure of dual spiral resonators with interdigital capacitive load. At the same resonant frequency, the resonator can occupy an area of less than 2.75% of the area of the square loop resonator. Moreover, the resonator has a very low sensitivity to substrate thickness. The resonator structure also allows two types of couplings and, hence, allows application of cross-couplings with different signs to the direct couplings.

References

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      • Huang, F., Xiong, X.: `Very compact spiral resonator implementation for narrow-band superconducting quasielliptic filter', European Microwave Conf., 2003, Munich, Germany, p. 1059–1062
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2010.2624
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