ON SYNTHESIS OF ISOTROPIC PATTERNS WITH CONCENTRIC RING CIRCULAR ARRAY

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...

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Bibliographic Details
Main Author: ZAIDI,SYED HAIDER RAZA
Format: Report
Language:English
Subjects:
ANTENNA RADIATION PATTERNS
BESSEL FUNCTIONS
COUPLED ANTENNAS
DIPOLE ANTENNAS
ELECTRICAL IMPEDANCE
ELECTROMAGNETIC FIELDS
MATHEMATICAL ANALYSIS
RINGS
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Summary: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)