The diffraction theory of large-aperture spherical reflector antennas

The Analysis of Hybrid Reflector Antennas and Diffraction Antenna Arrays on the Basis of Surfaces with a Circular Profile

“…As a rule the diffraction field inside spherical reflector is analyzed by means of uniform GTD based for large electrical radius of curvature ka of reflector. An interferential structure of the field along longitudinal coordinate of the hemispherical reflector z has a powerful maximum near a paraxial focus / 2 Fk a = ( fig.1) (Schell, 1963). The change of parameter z from 0 to 1 is equal to the change of radial coordinate r from 0 to a .…”

Spherical antenna design for satellite communications

“…In a future article [5], the steps are worked through to obtain the far fields for any arbitrary current density expressed in spherical variables and vector components. This paper describes the use of MATLAB for this particular application using the methods outlined in [4] [5].…”

Synthesis of the fields of a transverse feed for a spherical reflector

“…On t,he basis of the foregoing, we can stace that a pract.ical feed designed to produce the synthesized fields Ef(rs, 8,4) over its aperture and located at., say, r2 = 0.55-1 d l produce an eEciency of approximately 50 percent (see Fig. S) when it illuminates a spherical reflector which subtends an angle of 74.5" and ha.s a radius greater than, say, 5OX.…”