DESIGN OF SQUARE RING MSA WITH TWO NEARLY SQUARE SLOTS FOR WLAN APPLICATIONS

摘要

The major disadvantage of the microstrip-patch antenna is its inherently narrow impedance bandwidth of only a couple of percent. Intensive research is going on to develop bandwidth-enhancement techniques by keeping its size as small as possible. In this paper, square ring MSA with two nearly square slots is designed, simulated, fabricated and tested. It is a singly-fed, wideband and high gain Microstrip Antenna. The proposed antenna is left-hand circularly polarized and operates in 5 - 6 GHz frequency band. The impedance bandwidth with an input VSWR of 2 is obtained as 16.23% while the 6dB axial ratio bandwidth is measured over 4.52%.