Accession Number : AD0293868

Title :   ON SYNTHESIS OF ISOTROPIC PATTERNS WITH CONCENTRIC RING CIRCULAR ARRAY

Corporate Author : TENNESSEE UNIV KNOXVILLE

Personal Author(s) : ZAIDI,SYED HAIDER RAZA

Report Date : 15 OCT 1962

Pagination or Media Count : 1

Abstract : A procedure is developed to synthesize a specified approximation to an isotropic pattern with a concentric ring circular antenna array. Only synthesis of pattern in the vertical plane is required. This is achieved by expansion of the ideal pattern in a mathematical series. Such a synthesis leads to an antenna with an infinite number of rings. By suitable modifications, however, approximations to the isotropic pattern of practical significance were obtained with as few as three rings. A brief, mostly qualitative, description of circular array theory is included. For use in pattern synthesis, three different types of series expansions were studied. Modifications of the mathematical patterns are investigated in some detail to obtain some useful patterns with 3, 4 and 5 ring arrays. As an illustrative example, a three ring array was designed completely. (Author)

Descriptors :   *ANTENNA RADIATION PATTERNS, *ELECTROMAGNETIC FIELDS, BESSEL FUNCTIONS, COUPLED ANTENNAS, DIPOLE ANTENNAS, ELECTRICAL IMPEDANCE, MATHEMATICAL ANALYSIS, RINGS

Distribution Statement : APPROVED FOR PUBLIC RELEASE