THEORETICAL AND EXPERIMENTAL INVESTIGATION OF FOCAL PLANE ADAPTIVE ANTENNA TECHNIQUES
Abstract
A scalar analysis was performed to determine the field structure in the focal region of apertures focused in their near field (f/D<1). Solutions are given for plane waves at normal incidence, and several selected angles of arrival. The results indicate a substantial variation from the Fraunhofer far field patterns. Because it is a scalar approach, it is limited to large apertures (D>> wavelength) and small diffraction angles. An experiment was designed to complement the analysis. The qualitative agreement is very good. Sources of experimental error have been found which account for the quantitative variations. A technique for determining the field structure in the focal region, due to a reasonably arbitrary distribution in the aperture plane, is given. It consists of the superposition of an ensemble of plane waves, whose amplitude, relative phase, and angle of arrival are determined by the aperture plane distribution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1968
- Accession Number
- AD0670830
Entities
People
- Marvin Cohn
- Robert S. Littlepage