Title :
An offset-fed reflector antenna with an axially symmetric main reflector
Author :
Chang, Dau-chyrh ; Rusch, Willard V T
fDate :
11/1/1984 12:00:00 AM
Abstract :
A design method for an offset-fed, dual reflector antenna (Cassegrain type or Gregorian type) system with an axisymmetric main reflector is presented. Geometrical optics (GO) and the geometrical theory of diffraction (GTD) are used to find the surface-current density on the main reflector. A modified Jacobi-Bessel series (JBS) method is used to find the far-field pattern for the physical optics (PO) integral. In the defocused mode of operation, a new technique is developed to find the reflection point on the subreflector corresponding to the defocused feed and a general field point on the main reflector. Two sample systems are designed.
Keywords :
Reflector antennas, multireflector; Apertures; Design methodology; Feeds; Geometrical optics; Helium; Jacobian matrices; Physical theory of diffraction; Polarization; Reflector antennas; Scattering;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.1984.1143242