Method for suppressing side lobes of a linear phased antenna array using amplitude and phase distributions

摘要

This paper demonstrates the development of the analytical method of suppression of radiation pattern (RP) side lobes which is based on Woodward-Lawson method with three basic functions. The considered method allows to suppress the side lobes of the RP in a wide range of angles. It also allows to suppress RP side lobes in a desired direction. This approach can be used in digital antenna systems and the multibeam active phased antenna arrays. In the first part of the paper, linear phased antenna array (LPAA) consisting of isotropic equispaced radiators and methods of suppression of side lobes and creation of the operated minimum in a LPAA radiation pattern are considered. In the second part of the paper partial diagram method is considered. It is shown how to control the RP side lobes in wide range of angles. In the third part of the paper it is shown how to suppress RP side lobes in a desired direction. The fourth part of the paper shows how to synthesize amplitude and phase distribution to control RP side lobes. The method presented in this work allows to reduce the level of the side lobes of the radiation pattern by more than 50 dB in a wide range of angles, or in a given direction. Expressions for calculating the amplitude and phase distributions forming a minimum RP in a given direction are presented. Using LPAA with a given number of emitters, the use of the technique is demonstrated.