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International Journal of Antennas and Propagation
Volume 2017, Article ID 4831650, 8 pages
https://doi.org/10.1155/2017/4831650
Research Article

Compact Broadband Dual ZOR Antenna for Multiband Smart Mobile Phone Applications

Research and Development Center, EMW Co., Ltd., 169-16 Gasan Digital 2-ro, Geumcheon-gu, Seoul 08500, Republic of Korea

Correspondence should be addressed to Jeong Keun Ji; rk.oc.wme@saltayh

Received 5 March 2017; Accepted 2 May 2017; Published 24 May 2017

Academic Editor: Paolo Baccarelli

Copyright © 2017 Jeong Keun Ji. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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 (824–894 MHz), GSM900 (880–960 MHz), DCS1800 (1710–1880 MHz), PCS1900 (1850–1990 MHz), W2100 (1920–2170 MHz), LTE2300 (2300–2400 MHz), LTE2600 (2500–2690 MHz), and Wi-Fi (2400–2500 MHz) 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 40 mm × 6 mm × 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 210 MHz (0.81–1.02 GHz) and 1170 MHz (1.69–2.86 GHz), 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.