Design of a Broadband Microstrip Quasi-Yagi Antenna

A broadband microstrip quasi-Yagi Antenna is proposed in this paper. The antenna mainly consists of an active element, a reflector, two directors and four Split-Ring Resonators. A rectangular patch fed by microstrip wire is used as active element. Radiation characteristics of antenna are improved by a reflector which is composed of a rectangular patch and two curved branches and two directors. The gain of antenna is increased by four Split-Ring Resonators. The simulation results show that when the return loss of the antenna is less than -10dB, the antenna's operating bandwidth is 1.71GHz ~ 4GHz, and the relative bandwidth is up to 80.2%. The maximum gain of the antenna is 5.08 dB, and the antenna has good end-firing radiation characteristics. This antenna can be used in WLAN and other fields.