A Quad-Antenna System Operating at the 2.4/5.2/5.8 GHZ Wlan Bands for Laptop Computers

Abstract

Abstract-In this paper, a quad-antenna system for laptop computers is studied. Because two dualantenna systems can construct a quad-antenna system, the dual-antenna systems in the open literature are utilized. The mutual coupling between the two dual-antenna systems is analyzed and reduced. To validate the design of a quad-antenna system, the quad-antenna system, consisting of two dualantenna systems proposed in the open literature and a decoupling element, is fabricated and tested. Its measured −10 dB impedance bandwidths are 200 MHz (2.33-2.52 GHz) and 1.62 GHz (4.5-6.12 GHz). The measured mutual couplings are below −15.5/−19 dB at the 2.4-and 5.2/5.8-GHz WLAN bands, respectively. The measured gains are better than 2.4/3.9 dBi with efficiencies higher than 70%/72% at the two bands, respectively. The envelop correlation coefficient is evaluated based on the measured results.