Radiation Pattern, Reactive Power, and Resistive Aperture Antennas
Physical sciences research papers
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
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The main purpose of the report is to establish certain structural properties of a peculiar class of Plane Wave Spectra PWS representing an aperture field or, equivalently of radiation patterns which make the aperture reactive power equal to zero. To achieve this objective the entire question of the representation of an aperture field through a PWS is reexamined from a novel viewpoint. The Fourier transform FT of the transverse electric field on the aperture is considered as a two-dimensional vector field on the wavenumber plane, represented through two scalar functions, which are its coordinates in a chosen vector basis Section 3. The choice of the latter has an important physical significance since it corresponds to the decomposition of the PWS into two components having differently polarized radiation patterns and different reactive properties. In Section 4, it is shown that the conductance and the susceptance of an aperture can be expressed as integrals extended over the visible and invisible space of two quadratic forms whose explicit expressions depend upon the basis chosen to represent the PWS.
- Electrical and Electronic Equipment