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Proceedings Paper

Development of an optically switched high-temperature superconducting multichannel bandstop filter bank
Author(s): Neal Fenzi; Kurt Raihn; E. Soares; G. Mathaei
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Paper Abstract

An optically controlled bandstop filter bank has been developed using High-Temperature Superconducting (HTS) thin films for the filter resonator elements and light-sensitive GaAs for switch control. In the non-illuminated (reject) state the maximum rejection for each filter was typically 60 dB, and the attenuation could be switched to less than 0.5 dB at 10 GHz in the illuminated (pass) state. The high Qs of HTS resonators enable three-section filters with superior shape factors to be realized. We report on the development, design and test of a five- channel filter bank divided into two bands. The filters were designed using a bidielectric `stripline' configuration to reduce unwanted resonator coupling and permit frequency setting by adjusting tuning screws above each resonator. The filter elements were rectangular hairpin- style resonators loaded with an interdigitated capacitor to form the switch topology. The HTS realization permits switch banks with a large number of channels to be constructed with low insertion loss. Such units could be used to protect receivers while maintaining a low noise figure. This architecture allows for low loss protection against multiple signals, superior to existing YIG bandstop filter technology.

Paper Details

Date Published: 4 January 1994
PDF: 9 pages
Proc. SPIE 2156, High Tc Microwave Superconductors and Applications, (4 January 1994); doi: 10.1117/12.166164
Show Author Affiliations
Neal Fenzi, Superconductor Technologies Inc. (United States)
Kurt Raihn, Superconductor Technologies Inc. (United States)
E. Soares, Superconductor Technologies Inc. (United States)
G. Mathaei, Superconductor Technologies Inc. (United States)

Published in SPIE Proceedings Vol. 2156:
High Tc Microwave Superconductors and Applications
Robert B. Hammond; Richard S. Withers, Editor(s)

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