Free-space, broadband measurements of high-temperature, complex dielectric properties at microwave frequencies

Author

Varadan, Vasundara V. ; Hollinger, Richard D. ; Ghodgaonkar, Deepak K. ; Varadan, Vijay K.

Author_Institution

Dept. of Eng. Sci. & Mech., Pennsylvania State Univ., University Park, PA, USA

Volume

40

Issue

5

fYear

1991

fDate

10/1/1991 12:00:00 AM

Firstpage

842

Lastpage

846

Abstract

A free-space microwave measurement system that is used for the high-temperature measurement of dielectric constants and loss tangents of homogeneous materials and that is applicable to composite materials as well is discussed. The system is capable of operating in the 5.85-40-GHz frequency range and ambient to 850°C temperature range. A computer is used to control and coordinate furnace temperature, network analyzer functions, and data storage. Dielectric constants and loss tangents of the materials are calculated from the measured values of S₂₁. The measurement system, including the high-temperature furnace and the calibration technique, is described. Dielectric constants and loss tangents are presented for fused quartz and boron nitride grade HP in the frequency range 13.0-17.4 GHz and the temperature range from ambient to 850°C

Keywords

boron compounds; calibration; composite materials; computerised control; computerised instrumentation; dielectric loss measurement; high-temperature techniques; microwave measurement; permittivity measurement; quartz; 20 to 850 degC; 5.85 to 40 GHz; BN; broadband measurements; calibration; complex dielectric properties; composite materials; computer; control; coordinate furnace temperature; data storage; dielectric constants; free-space microwave measurement; fused quartz; high-temperature furnace; high-temperature measurement; homogeneous materials; loss tangents; microwave frequencies; network analyzer; Composite materials; Dielectric constant; Dielectric loss measurement; Dielectric materials; Dielectric measurements; Frequency; Furnaces; Loss measurement; Microwave measurements; Temperature distribution;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.106308

Filename

106308