A Compact Symmetrically Inverted Slotted T-Shaped Patch Antenna for Tri-band Communications

Abstract

A tri-band microstrip antenna using two symmetrically inverted slotted T-shaped patch is presented. By introducing rectangular slots, the patches are fed through two rectangular strips and the ground plane is modified so that the tri-band characteristics are achieved which are applicable for radars, satellites, and WLAN (wireless local area network) communications. The designed compact antenna structure offers three operating bands by fulfilling the bandwidth requirements with impedance bandwidth of 250 MHz (4.6-4.85 GHz), 500 MHz (6.7-7.2 GHz) and 800 MHz (7.75-8.55 GHz), having the respective resonant frequencies of 4.7 GHz, 6.9 GHz, and 8.05 GHz. The designed antenna provides good and stable radiation characteristics at all the desired operating bands with gain of 5.1 dBi, 6.5 dBi, and 4.6 dBi, respectively. The measured results of the fabricated antenna prototype reflect a justified compliance with the simulated results.