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| Array Pattern Nulling by Amplitude-Only Perturbations |
| Zeng Yun-bao; Huang Cai-shi; Peng Tao; Wang Wen-bo |
| Center of Wireless Communication, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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Abstract A new method based on amplitude-only perturbations for the pattern synthesis of linear antenna array with prescribed nulls is proposed. It is capable of steering narrow and broad nulls with satisfactory nulls depth in the directions of strong interference signals and acceptable sidelobe level in the beam pattern without affecting the main beam. The phase shifters are only used to steer the main beam toward the desired direction. In so doing, the responsed time can be reduced. Simulation results show that this method is easier to realize, and its capability is comparable to that of controlling complex weights (both amplitude and phase). Besides, the fact that the amplitude perturbations of the elements are symmetrical about the center of the array means that the amount of attenuators is halved.
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Received: 11 April 2005
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2006, Vol. 28 
