Bi-directional Dual Band Antenna Development for Wi-Fi Applications in Street Scenarios

A bi-directional antenna development for Wi-Fi 2.4/5 GHz band operations were presented in this paper. The proposed antenna consists of two slot-coupled microstrip antenna arrays with ± 45° dual slant polarization which are excited by stripline-fed through slot aperture in the metal ground planes on the upper and lower surface of the feeding substrate, and then the field is coupled to the radiator on both side antenna substrates with air gap to achieve bidirectional radiation pattern properties for Wi-Fi dual band multiple-input multiple-output (MIMO) applications. A sandwich dielectric substrate is composed of two layers RO4000 series laminates and one-layer prepreg bonding materials and used as a stripline-to-microstrip line feeding network circuit board. This feeding configuration is located between slot aperture ground plane to serve as the entire aperture coupling structure use, and it’s also easy to integrate with RF coaxial cable for such a transmission line transition design. Simulation results verify that such a stripline-fed slot-coupled microstrip antenna construct can provide highly symmetrical bi-directional radiation pattern characteristics, is therefore suitable as potential candidates for bi-directional coverage of Wi-Fi applications in street scenarios.