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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2010-02-18
Pattern Optimization in an UWB Spiral Array Antenna
By
Amir Jafargholi,

    Dr. Amir Jafargholi

    Department of Physics and Energy Engineering

    Amirkabir University of Technology (Tehran Polytechnic)

    Iran

    Homepage

Manouchehr Kamyab

    Dr. Manouchehr Kamyab

    K. N. Toosi University of Technology

    Iran

    Homepage

Progress In Electromagnetics Research M, Vol. 11, 137-151, 2010
doi:10.2528/PIERM10010302 | Google Scholar

Abstract
We have proposed a new architecture for an array in which the elements are placed on a spiral curve in order to obtain an ultra wideband (UWB) radiation pattern. In addition, array factor and bandwidth of the proposed spiral array are calculated. Simulated results obtained by SuperNEC and CST software have shown good agreement with the analytic calculations. Although the proposed antenna array is wideband in nature, it lacks desirable efficiency, due to poor front to back ratio (FBR) and sidelobe level (SLL). In this paper, we have chosen three different approaches in order to improve the e±ciency of proposed array. First, the effect of length and thickness tapering of elements has been studied. Second, we have used Genetic Algorithm (GA) to optimized pattern shape. Finally, the influence of metamaterial cover on array performance has been investigated. Although the first and second methods improve the radiation pattern, the array bandwidth is reduced. It is shown that the third method improves array directivity and FBR by 5-7 dB and 15-17 dB respectively within the frequency band of operation.
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Citation
Amir Jafargholi, and Manouchehr Kamyab, "Pattern Optimization in an UWB Spiral Array Antenna," Progress In Electromagnetics Research M, Vol. 11, 137-151, 2010.
doi:10.2528/PIERM10010302
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