A dual-band embedded inverted T-slot circular microstrip patch antenna

An embedded inverted T-slot circular microstrip patch antenna with dual-band at 2.4 GHz and 5.5GHz is proposed in this paper. It is designed on a substrate FR4 (ε
r
= 4.3 and tanδ = 0.04) with a size of 30 mm × 30 mm × 1mm. The radius of the circular patch is 11.4 mm. The inverted T-slot is 2 mm × 16 mm and 2 mm × 13.5 mm. This antenna is fed by coaxial probe feed. The bandwidth below −15dB is 80 MHz (from 2.4GHz to 2.48GHz) and below −10dB is from 5.36GHz to 5.87GHz. The directivity is 4.78dbi and 7.26dBi in 2.44GHz and 5.5GHz respectively.