Design of wideband and multiband microstrip array antennas

Abstract

A method for improving the impedance bandwidth of microstrip array antenna by incorporating a slot in the radiating patches is presented. It is further described by using a common parasitic element, which is gap-coupled to the radiating edges of the rectangular patches and embedding a slot in the parasitic element. The use of gap-coupling and slot in the parasitic element makes the antenna to have wider impedance bandwidth and leads to its operation at more than one band of frequencies. The design concepts of antenna are described and experimental results discussed. These antennas may find application in mobile communication.