Design of Multiband Antennas for Wireless Communication

Recent developments in the field of wireless communication industry continue to drive the requirements for small, compatible, and affordable multiband antennas. To overcome the challenges of multi-frequency operation a new scheme of multiband is proposed. In this paper, the design of a micro strip patch antenna for multiband operations is proposed. This antenna shows the three distinct frequency bands, centered at 4.02 GHz, 6.18 GHz and 11.13 GHz. Furthermore, to increase the frequency bands the same antenna structure is modified by attaching a T-shaped slit on the radiating patch. This proposed modified antenna has four distinct operating frequency bands centered at 3.92 GHz, 5.82 GHz, 7.88 GHz and 11.35 GHz with improved return loss. The proposed antennas has compact size of 25 × 28 × 0.82 mm³ including the ground plane and both antenna structures are designed on FR-4 substrate (er= 4.4) of thickness h=0.8 mm. The proposed structures were simulated by using the electromagnetic (EM) simulation software. The simulated return losses are less than-10 dB at resonance frequencies. The presented antennas are suitable for multiband wireless communication systems.