An electronically scanned circular antenna array

A circular antenna array is described in this paper which has the following characteristics: 1. Any azimuthal pattern can be obtained which can be represented by a truncated Fourier series. 2. The main beam can be pointed to any azimuth angle. 3. The phase of the current in each element and the terminal impedance of each element does not depend on the direction of pointing. These characteristics make it possible to connect amplifiers to each element and to control the direction of pointing by varying only the magnitude of the amplifier output. The design of an array of this type and of the required amplifiers is described, and experimental confirmation is presented.