Title :
Analysis of rotationally symmetric arrays of apertures on conducting spherical surfaces
Author :
Bondyopadhyay, Probir K.
Author_Institution :
NASA Johnson Space Center, Houston, TX, USA
fDate :
8/1/1992 12:00:00 AM
Abstract :
Rotationally symmetric arrays of circular waveguide fed apertures on conducting spherical surfaces have been analyzed. Representation of the outside electromagnetic fields in terms of spherical transmission line modes permits the array analysis to be viewed as a spherical waveguide junction discontinuity problem. The apertures, in general, carry dual polarized circular waveguide TE11 modes. Two independent formulations-the unit cell method and the eigen excitation method, which take rotational symmetry into account-are developed and are checked against each other numerically for computational accuracy. These two formulations are analytically linked as discrete Fourier series pairs. It is seen that mutual coupling along the array decays more rapidly when the polarization of excitation is perpendicular to the array plane than when it is parallel to it. This analysis has been applied in the performance analysis of the dome lens phased array radar antenna
Keywords :
antenna phased arrays; antenna theory; lens antennas; radar antennas; circular waveguide fed apertures; computational accuracy; conducting spherical surfaces; discrete Fourier series pairs; dome lens phased array radar antenna; dual polarized circular waveguide TE11 modes; eigen excitation method; mutual coupling; outside electromagnetic fields; rotationally symmetric arrays; spherical transmission line modes; spherical waveguide junction discontinuity problem; unit cell method; Apertures; Electromagnetic analysis; Electromagnetic fields; Electromagnetic waveguides; Performance analysis; Phased arrays; Radar antennas; Surface waves; Transmission lines; Waveguide junctions;
Journal_Title :
Antennas and Propagation, IEEE Transactions on