Antenna Beam Broadening in Multifunction Phased Array Radar

01/2011; 119.


A phased array antenna is designed for multifunction phased array radar simulation test bed. Effect of element pattern, mutual coupling between elements, phase quantization, amplitude and phase error and elements failure rates on array pattern are discussed. Target angle measurement and side lobe cancelling, in order to reduce jamming power through side lobes, is illustrated in this antenna. Also antenna beam width is broadened with different methods and compared with narrow beam characteristics. It is shown that, for special broad-ening factors, beam broadening may lead to a better coverage and power efficiency relative to narrow beam antenna.

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    ABSTRACT: Multifunction phased array radars usually have narrow beam widths to meet their tracking requirements such as resolution and accuracy. Search of a large area by this narrow beam becomes too time consuming. In these occasions antenna beam broadening is useful and may reduce search time or increase probability of detection. In this paper different methods for antenna beam broadening is discussed and compared with each other. A broad beam is designed with each of the phase only, amplitude only and amplitude-phase methods. Phase only method shows better power efficiency but amplitude only method yields better side lobe level and ripples. It is shown that, for special broadening factors, beam broadening may lead to a better coverage and power efficiency than narrow beam antenna and is better suited for phased array radar applications.
    Antennas and Propagation Conference (LAPC), 2011 Loughborough; 01/2011


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