A Mach-Zehnder interferometer for the measurement of the complex permittivity of lossy dielectrics at submillimetre wavelengths

Abstract

A Mach-Zehnder interferometer is described which can be used to measure the complex permittivity of lossy dielectrics in the submillimetre region. Measurements made at 890.8 GHz show that epsilon ' is 2.355 and epsilon " is 0.123 for chlorobenzene and that epsilon ' is 4.040 and epsilon " is 2.219 for water. These values agree favourably with those obtained by other workers.