Compact Broadband Dual ZOR Antenna for Multiband Smart Mobile Phone Applications

摘要

A compact broadband dual zeroth-order resonator (ZOR) antenna is proposed for multiband smart mobile phone applications. The theory of broadband zeroth-order mode and multimode technique is used to design the proposed antenna covering GSM850 (824-894MHz), GSM900 (880-960MHz), DCS1800 (1710-1880MHz), PCS1900 (1850-1990MHz), W2100 (1920-2170MHz), LTE2300 (2300-2400MHz), LTE2600 (2500-2690MHz), and Wi-Fi (2400-2500MHz) bands. In order to achieve broadband operations, the proposed antenna consists of a large ZOR and a small ZOR that can generate and merge resonant frequencies of the negative-order, zeroth-order, and positive-order modes. The overall size of the antenna is 40mm x 6mm x 3 mm. The performance of the antenna is verified by both full-wave simulations and experiments. The measured impedance bandwidths of 3 : 1 VSWR in the low and high bands are 210MHz (0.81-1.02GHz) and 1170MHz (1.69-2.86GHz), respectively. The antenna provides omnidirectional radiation patterns and measured radiation efficiencies exceeding 43.3% and 47.5% for low and high bands, respectively. The antenna performance applied to the commercial smart mobile phone device is also presented. The measured results show that it has the active performance of good total radiated power, total isotropic sensitivity, and specific absorption rate, which can meet the requirement of the smart mobile phone.