Design of hybrid fed patch antenna for diversity application

A dual-port conformal diversity patch antenna with different radiation characteristics has been presented. By making use of hybrid feeds, the conical TM₀₁ mode and the broadside TM₁₁ mode of the antenna could be excited at the same frequencies. With this feeding scheme, both pattern and polarization diversities can be exploited and high isolation (<;-55dB) between the two ports can be achieved for WLAN application. From the simulated results, it is found that the main-beam positions of the radiation patterns are directed at the elevation angles of 50° and 0° for both modes, respectively. This characteristic makes the antenna to be a good candidate for future pattern or polarization diversity applications in the WLAN and MIMO communications systems.