Summary
This paper presents bees algorithm (BA) for null steering of linear an- tenna arrays by controlling only the element positions. The BA is an optimization algorithm inspired by the natural foraging behavior of honey bees to find the op- timal solution. To show the versatility and flexibility of the proposed BA, several examples of Chebyshev array pattern with the imposed single, multiple and broad nulls are given. It is found that the nulling technique based on BA is capable of steering the array nulls precisely to the undesired interference directions. For prac- tical consideration, the sensitivity of the produced patterns due to small variations of the element positions is also examined by rounding the element position values to the second decimal position.
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Bees Algorithm for Null Synthesizing of Linear Antenna Arrays by Controlling Only the Element Positions
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1. IntroductionAntenna arrays have been widely used in mobile, wireless, satellite and radar communications systems to improve signal quality, thereby increasing system coverage, capacity and link quality [I]. The performance of these systems depends firmly on the antenna array design. The process of determining the parameters of an antenna array to obtain the required antenna radiation pattern is known as pattern synthesis. Due to the increasing pollution of the electromagnetic environment, the antenna array which allows placing nulls in the far field pattern at specified directions, is becoming important in communication systems, sonar, and radar applications for maximizing signal- to- interference ratio [1-23]. Methods of null steering, which have been studied extensively in the past [1-23], include controlling the amplitude- only, the p hase- only, the posit ion- only, and the complex weights (both the amplitude and phase) of the array elements. These methods have been u...See the full content of this document
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