Triple band U-slot microstrip patch antenna for WLAN and wireless sensor applications

A novel Triple band U-slot microstrip patch antenna is presented in this paper. U-slot technique is used to get the wide band width at three selected frequencies. The structure proposed antenna is different from conventional microstrip patch antenna. In this paper the structure is designed on FR-4 substrate, using CST Microwave studio, simulated return loss is greater than 10 dB at center frequencies 5.59 GHz, 6.1 GHz and 6.8 GHz. The return loss is achieved 30dB, 15dB and 36.8 dB at center frequencies 5.59 GHz, 6.1 GHz and 6.8 GHz respectively. The substrate height is 1.99mm and dielectric constant is 4.4. Good enough for WLAN at 5.59GHz and second & third band used for wireless sensor applications.