Jacob, Mohan V., Mazierska, Janina, Knack, Adrian, and Takeuchi, Seiichi (2004) Miniaturized 10-pole superconducting filter on MgO substrate for mobile communication. In: Proceedings of TENCON 2004 Conference (3) pp. 554-557. From: TENCON 2004 IEEE Region 10 Conference, 21 - 24 November 2004, Chiang Mai, Thailand.

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Abstract

Size of narrow band superconducting filters depends on the permittivity of the substrate used and the filter frequency. Size of good quality high temperature superconducting thin film wafers at a reasonable price is limited to two inches, as cost of bigger wafers makes the filters not economical. In this paper we present a design of a 10-pole filter for a centre frequency of 1.88 GHz and bandwidth of 20 MHz using ideas of the modified hairpin, the Chebyshev approximation without the influence of cross coupling between the non-adjacent resonators. The design fits onto a half of a two inch YBa₂Cu₃O₇ on MgO wafer. The simulated passband insertion loss of the filter is 0.1 dB and the out-of-band rejection is 50 dB at 4 MHz from the passband on both sides.

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