Complex permittivity of lanthanum aluminate in the 20 to 300 K temperature range from 26.5 TO 40.0 GHZ
- 1 January 1990
- journal article
- research article
- Published by Wiley in Microwave and Optical Technology Letters
- Vol. 3 (1) , 11-13
- https://doi.org/10.1002/mop.4650030105
Abstract
Dielectric constants of microwave subtrales are required in the design of superconducting microwave circuits at various temperatures. In this paper, we report the results of a study of the complex permittivity of the newly developed lanthanum aluminate (LaAIO3) substrate, in the 20 to 300 K temperature range at frequencies from 26.5 to 40.0 GHz. The value of the complex permittivity was obtained by measuring the sample scattering parameters using a microwave waveguide technique. It is observed that, while the dielectric constant did not change appreciably with frequency, its value decreased by approximately 14 percent from room temperature to 20 K.Keywords
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