Dual-Band Directional Slot Antenna for Wi-Fi Application

A directional slot antenna with a squared arch structure for Wi-Fi applications is proposed in this communication. In general, one antenna can hardly obtain a nonsplitting and relatively consistent radiation beam in both the 2.4 and 5 GHz bands. A relatively consistent horizontal beamwidth in the dual bands is desired to maintain the same sector signal coverage and avoid interfering with adjacent sectors to maximize the data transmission in usage scenarios such as a sports stadium and warehouse. With a squared arch design, the proposed slot antenna can keep the H-plane beamwidth relatively the same in the dual bands. The slot antenna achieves good matching in both the 2.4 (2.4-2.5 GHz) and 5 GHz (4.9-5.9 GHz) bands, and good vertical polarization. An expression describing the condition of generating a nonsplitting beam is derived as a function of the source spacing, and can be used to guide the arch design. Finally, the proposed slot antenna with the squared arch structure is validated by both simulations and measurements of a prototype.