A Quasi-Isotropic Antenna with Asymmetric Dual-Branch for Mobile Terminal Integrated Design

Abstract

A compact quasi-isotropic antenna with asymmetric dual-branch which can be integrated with the mainboard of mobile terminal has been proposed in this paper. The proposed antenna locates in a corner of the mainboard, consisting two parallel L-shaped metal branches in each side of the mainboard and a vertical branch connecting and supporting them. The parallel and vertical branches together realize complementation of the radiation pattern. To prove the design, radiation performances of the proposed antenna have been studied by simulations. The antenna has a −10 dB bandwidth of about 40 MHz, from 2.43 GHz to 2.47 GHz. The efficiency of the proposed antenna is above 85% within the operation band. The gain variation versus angle of the proposed antenna is lower than 6.13 dB in all three cross sections.