A Theoretical Study of the Axial Field Amplitude of Microwave Paraboloidal, Spherical and Plane Zone Plate Antennas

Abstract

A theoretical investigation of the spherical, the plane and the paraboloidal microwave zone plate antennas has been made on the basis of the Fresnel-Huyghen's diffraction theory. Rigorous formulae for the field amplitude at an axial point for the three zone plates have been derived. Some approximate expressions have also been given by assuming that the obliquity factor remains almost a constant over a zone.