Evaluation of the interference rejection capability of a uniform circular array

Abstract

This paper deals with the interference rejection capability of circular antenna arrays, as base stations of wireless communications systems. In general, this figure of merit depends strongly on the array configuration and is a function of the direction of arrival of the desired signal, the number of antenna elements, and their spacing. The main goal and contribution of this paper is to provide a detailed presentation of the behavior of the interference rejection capability of uniform circular arrays. The effect of varying the number of elements and inter‐element spacing on the SIR (signal‐to‐interference ratio) performance is considered. In addition, the effect of mutual coupling is taken into account. Analytical results, for the total average of spatial interference suppression coefficient for circular arrays, as a function of inter‐element spacing when mutual coupling is known and without mutual coupling are provided.