Abstract
Author(s): Capolino, F; Bussotti, P; Borselli, L; Albani, M; Maci, S | Abstract: The problem of edge diffraction close to a point caustic is analyzed in a typical dual-reflector Gregorian antenna in offset configuration. The diffraction phenomenon is produced by a perfectly conducting fin located between the feeder and the main reflector. This fin is sometimes used to reduce the coupling between the primary feed and the main reflector. For the sake of simplicity, the two-dimensional case is studied here, but the present technique can also be applied to practical three-dimensional configurations. © 1997 John Wiley a Sons, Inc.
Highlights
High-gain reflector antennas for space applications sometimes require pressing performances of cross-polarization levels
The problem of edge diffraction close to a point caustic is analyzed in a typical dual-reflector Gregorian antenna in offset configuration
For the sake of simplicity, the two-dimensional case is studied here, but the present technique can be applied to practical three-dimensional configurations. ᮊ 1997 John Wiley & Sons, Inc
Summary
Microwave radiometry is a technique capable of distinguishing local thermal variations in concrete at thicknesses of the order of 10 cm, as a result of duct heating. The feasibility study presented in this article examines a numerical model of this application, first in the case of constant permittivity and considering the existence of a permittivity gradient within the concrete. A better agreement between theory and experiment is observed when a permittivity gradient within the concrete is taken into account
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