A Dual-band Wide-beamwidth WLAN Access Point Antenna

Abstract

A dual-band printed dipole antenna with wide-beamwidth radiation patterns is introduced for 2.4/5 GHz bands wireless local area network access points. A printed dipole is designed at the center of circular ground plane and fed by a novel integrated balun consisting of a curved microstrip-line and a circular slot to allow broadband operation. An angled dipole and two vertical copper plates on the ground plane are used to achieve wide beamwidth in lower and upper bands, respectively. The proposed antenna has an impedance bandwidth of 2.395 - 2.50 GHz and 5.07 - 5.96 GHz for the -10 dB reflection coefficient. At 2.45 GHz, the antenna has gain of 6.86 dBi, front-to-back ratio of 21 dB, and half-power beam-width of 104 degrees and 102 degrees in the E- and H-planes, respectively. At 5.5 GHz, the antenna has gain of 6.92 dBi, front-to-back ratio of 27 dB, and half-power beam-width of 118 degrees and 114 degrees in E- and H-planes, respectively.