Published March 1, 1991
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Thin-film power-density meter for millimeter wavelengths
Abstract
A quasi-optical power density meter for millimeter and submillimeter wavelengths has been developed. The device is a 2-cm^2 thin-film bismuth bolometer deposited on a mylar membrane. The resistance responsivity is 150 Ω/W, and the time constant is 1 min. The meter is calibrated at DC. The bolometer is much thinner than a wavelength, and can thus be modeled as a lumped resistance in a transmission-line equivalent circuit. The absorption coefficient is 0.5 for 189-Ω/square film. The power-density meter has been used to measure absolute power densities for millimeter-wave antenna efficiency measurements. Absolute power densities of 0.5 mW/cm^2 have been measured to an estimated accuracy of 5%.
Additional Information
© Copyright 1991 IEEE. Reprinted with permission. Manuscript received May 10, 1990; revised September 20, 1990. This work was supported by the Jet Propulsion Laboratory, the Aerojet Electrosystems and the Department of Defense Terahertz Technology Program, under Contract F19628-87-K-0051, which is managed by the Electromagnetics Directorate of RADC and funded by SSIO-IST.Files
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