Radiation pattern shaping for FM broadcast-optimizing coverage

College

Gokongwei College of Engineering

Department/Unit

Electronics And Communications Engg

Document Type

Conference Proceeding

Source Title

ISIEA 2010 - 2010 IEEE Symposium on Industrial Electronics and Applications

First Page

222

Last Page

225

Publication Date

12-1-2010

Abstract

This paper describes how to configure the radiation pattern of an omnidirectional FM antenna to at least approximate a desired directional radiation pattern. The desired radiation pattern is based on the population location within the coverage area of an FM radio station. In this way, the station will transmit signal only in directions where the signal is needed, thereby the station's transmitter will be operating at much reduced power. A linear uniform antenna array is used to produce the customized radiation pattern on the horizontal plane. The array is composed of two basic identical omnidirectional antennas, each is called a bay. By determining the proper distance and phase relationship of the two identical basic antennas, any radiation pattern can be realized. Genetic algorithm (GA) is used in optimizing the values of the distance and the phase relationship of the two bays in linear array, producing an optimized radiation pattern identical to the desired radiation pattern. Genetic Algorithm is implemented in Matlab. Optimum values of the GA parameters are first determined prior to the optimization of the radiation pattern for a more accurate, consistent and faster results. Two directional patterns are presented to demonstrate the method. Finally, an antenna simulation software is used to validate the results in each case. ©2010 IEEE.

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Digitial Object Identifier (DOI)

10.1109/ISIEA.2010.5679465

Disciplines

Electrical and Electronics | Systems and Communications

Keywords

Antenna radiation patterns; FM broadcasting

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