The design of a high gain, low profile and planar antenna

We proposed a patch antenna with a circular ring structure loaded at the source of antenna radiation to increase the gain. Expanding the ground to suppress the backward wave of the antenna. Compared with conventional antennas, the gain of the designed antenna is 11.6 dBi, which is increased by 5 dBi, and improved with 75.7%. The metamaterial antenna shows good impedance match in a wideband form 8.47 GHz to 9.37 GHz. This paper provides a method to improve the gain of the micro-strip patch antenna and the method can effectively improve the gain of the antenna without increasing the profile. Experiment ware carried out to verify the simulation results.