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Microwave properties of composite ceramic phase shifter materials

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4 Author(s)
Geyer, R.G. ; Nat. Inst. of Stand. & Technol., Boulder, CO, USA ; Krupka, J. ; Sengupta, L. ; Sengupta, Somnath

The microwave properties of bulk ceramic barium strontium titanate and non-ferroelectric oxide composites are measured at X-band with a cylindrical mode-filtered resonant cavity. A helical wire-wound waveguide makes up the cavity's cylindrical wall, which permits the use of high-purity TE01p resonant modes for high accuracy permittivity measurements. Measurement results at 300 K show that microwave dielectric losses increase as the stoichiometric percentage of barium increases. The real relative permittivity increases with decreasing weight percent of added non-ferroelectric low-loss oxide. Dielectric losses rapidly decrease with the addition of a relatively small amount of non-ferroelectric oxide

Published in:

Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on  (Volume:2 )

Date of Conference:

18-21 Aug 1996