Title :
A novel W-band spectrometer for dielectric measurements
Author :
Afsar, Mohammed Nurul ; Tkachov, Igor I. ; Kocharyan, Karen N.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Tufts Univ., Medford, MA, USA
fDate :
12/1/2000 12:00:00 AM
Abstract :
A new spectrometer for the precision measurement of dielectric permittivity and loss tangent is presented. The new instrument is capable of providing high-resolution data for the first time over an extended W-band (68-118 GHz) frequency for specimens with a large range of absorption values, including highly absorbing specimens that otherwise would not be possible. A novel technique based on the unbalanced bridge is developed for the measurement of the phase of the wave passed through the specimen in free space (quasi-optical) with reference provided by a waveguide arm. Specially constructed precision waveguide and quasi-optical components allowed reliable broadband operation. A number of common dielectrics are measured, and results are compared with previously reported data
Keywords :
dielectric loss measurement; millimetre wave measurement; permittivity measurement; radiofrequency spectrometers; 68 to 118 GHz; EHF; MM-wave spectrometer; W-band spectrometer; broadband operation; dielectric constant; dielectric loss tangent; dielectric measurements; dielectric permittivity; high-resolution data; highly absorbing specimens; precision measurement; unbalanced bridge; waveguide arm reference; Absorption; Bridges; Dielectric loss measurement; Dielectric losses; Dielectric measurements; Electrochemical impedance spectroscopy; Frequency; Instruments; Loss measurement; Permittivity measurement;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
