Tapered Antenna Array with Non-identical Triangular MSA Elements for FSLL Reduction

Abstract

Reduced interference from nearby communication systems is an essential need in all generations of wireless communication systems. In this paper, interference is reduced by reducing the first side lobe level (FSLL) by using the concept of tapering realized with non-identical triangular elements. Resonance frequency of an Equilateral triangular microstrip antenna depends on its patch height. This property has been used effectively to realize isosceles triangular microstrip antenna with equal height, thus resonating at the same frequency. The isosceles triangular elements are designed as non-identical elements, based on its area reduction and hence gain variation, with respect to three different standard amplitude distribution functions. Six such arrays have been designed with two different inset notch feed gaps. An analysis of the non-identical elements’ antenna arrays with varying inset notch feed gaps to realize tapering in the H-plane for FSLL reduction has been presented. To verify the proposed concept, one triangular patch array using eight non-identical equilateral and isosceles triangular elements designed at 6 GHz is fabricated and tested. A reasonably acceptable agreement between the simulated and measured results validates the proposed concept.