A compact tri band microstrip slotted antenna with defected ground for wireless applications

A compact tri band slot loaded defected ground microstrip patch antenna, operating on three frequencies is presented. The antenna operates effectively at 3, 5.3 and 8 GHz. Simulated return loss at 3 GHz, 5.3 GHz and 8 GHz turns out to be −11.59 dB, −17.52 dB and −16.42 dB, respectively. The proposed antenna is compact in size and has been designed using FR4 epoxy substrate with a relative permittivity of 4.4. The design uses differently spaced rectangular and T-shaped slots in the patch and a defected ground structure with square and U-shaped slots. The proposed antenna can find applications in different wireless systems like WLAN and WiMAX. The implemented design is simulated using High Frequency Structure Simulator (HFSS). The proposed design has also been fabricated and the return loss has been measured and found in agreement with the simulated values.