Compact Dual Circularly Polarized Patch Antenna with High Ports Isolation for MIMO WLAN Application

This paper proposes a design of two-ports circularly polarized stacked patch antenna with square ring slot feeding technique for multiple-input-multiple-output (MIMO) application. The antenna with a quarter-wavelength slot and chamfering patch., which radiates at 2.4 GHz., occupies an overall area of 96×96×42 mm
³
. The 7.6-dBic gain antenna prototype presents an axial ratio lower than 0.4 dB in the operating frequency band (2.4 to 2.485 GHz) as well as a port isolation higher than 27 dB. Therefore., this antenna demonstrates good port-to-port isolation., axial ratio (AR) as well as a compact dimension and is suitable to be used in systems that operate in a wireless local area network (WLAN) frequency band.