Miniaturized yagi class of antennas for GSM, WLAN, and WiMax applications

This paper presents a miniaturized broadband Yagi antenna design for GSM, WLAN, and WiMax applications. This antenna is comprised of an inverted-F and two inverted-L shaped wires as active and parasitic elements in the array configuration. The realizable gain of the antenna is over 4 dBi and the front to back ratio of the radiation is over 6 dB. The measured return loss of the antenna shows the good broadband characteristics. The radiation patterns of the antenna are close to the omni-directional characteristics in the half-hemi sphere.