Miniaturized superconducting filter for mobile communications

Superconducting filters show many advantages over conventional filters such as higher selectivity, better out-of-band rejection and less interference between adjacent channels. Using ideas of a modified hairpin, the Chebyshev approximation and cross coupling between non-adjacent resonators, we have designed a 12-pole superconducting filter for centre frequency of 1.84 GHz and bandwidth of 5 MHz. The filter utilises YBa2Cu3O7-δ films on a 58 mm × 14 mm × 0.3 mm LaAlO3 substrate, 0.3 mm thick. The simulated passband insertion loss of the filter is 0.1 dB and the out-of-band rejection is 50 dB at 1 MHz from the passband.

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IEEE TENCON 2003 Conference on Convergent Technologies for the Asia-Pacific Region

2

978-0-7803-8162-9

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