NTIA Technical Memorandum TM-05-426

Radiation Pattern Analysis of a Four–Element Linear Array

July 2005

John J. Lemmon

Abstract: The effects of mutual coupling on the radiation pattern of a four–element linear array were investigated. The objective was to improve the angular resolution of the array for direction–of–arrival estimation by compensating for mutual coupling. It is concluded that the effects of mutual coupling on the performance of the array are not significant, and that the angular resolution of the array is consistent with its theoretical radiation pattern in the absence of mutual coupling. However, it is recommended that the array be calibrated to compensate for systematic errors and any (small) mutual coupling effects that are present.

Keywords: direction–of–arrival (DOA); linear array; mutual coupling

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