Non Surface Wave Mutual Reducing in Microstrip Antennas Array

Abstract

It is well known that the mutual coupling can be classed with surface wave mutual coupling and non-surface wave mutual coupling simply in microstrip antennas array. The surface wave mutual coupling has been researched far and wide and lots of interest researches have been present in recent years. But the investigating about the non-surface wave mutual coupling which contains space coupling, fringe field coupling. This paper introduces a simple method that can be used in design of closely spaced microstrip antennas array without surface wave coupling, and which can also be used to combine with the reduction surface wave strategy to improve the isolation in the antennas array. Two traditional microstrip antennas with the air substrate in this paper are used to analyze the affection of the different correlative parameters in the condition of non-surface wave mutual coupling. Using the proposed model, the mutual coupling, described by the network parameter S21, of about –15 dB from the initialization of about –6 dB, and the gain of the proposed structure can also improve 2.53 dB.