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Magnetically Tuned Superconducting Filters

Published online by Cambridge University Press:  10 February 2011

D. E. Oates ,
A. C. Anderson  and
G. F. Dionne
D. E. Oates
Affiliation:
MIT Lincoln Laboratory, 244 Wood St., Lexington MA 02140-9108 oates@ll.mit.edu
A. C. Anderson
Affiliation:
MIT Lincoln Laboratory, 244 Wood St., Lexington MA 02140-9108 oates@ll.mit.edu
G. F. Dionne
Affiliation:
MIT Lincoln Laboratory, 244 Wood St., Lexington MA 02140-9108 oates@ll.mit.edu
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Abstract

We have demonstrated magnetically tunable superconducting filters consisting of microwave circuits coupled to ferrite substrates in monolithic structures using both niobium at 4 K and YBCO at 77 K. A three-pole 1% bandwidth filter with 10-GHz center frequency, 1-dB insertion loss, and greater than 10% tunability has been demonstrated. Operation of the ferrite in the partially magnetized state prevents degradation of the surface resistance of the superconductor. This technology has the potential for compact, light weight, multipole filters with very low insertion loss, <0.5 dB, and very rapid tunability, <1 µs, due to the low inductance of the magnetic circuits. We also discuss the use of lightly coupled ferroelectric films to introduce trimming of the individual resonators in the magnetically tuned filters. The materials issues that limit performance and means to improve present performance are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 603: Symposium KK – Materials Issues for Tunable RF & Microwave Devices , 1999 , 113
Copyright
Copyright © Materials Research Society 2000

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References

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