Internal Coupled-Fed Dual-Loop Antenna Integrated With a USB Connector for WWAN/LTE Mobile Handset

• Published in: IEEE transactions on antennas and propagation 2011-11, Vol.59 (11), p.4215-4221
• Main Authors: CHU, Fang-Hsien, WONG, Kin-Lu
• Format: Article
• Language: English
• Subjects: Antenna measurements; Antenna radiation patterns; Antennas; Applied sciences; Connectors; Coupled-fed loop antennas; Data buses; Equipments and installations; Exact sciences and technology; Grounds; handset antennas; Joining; Long distance private networks; LTE antennas; mobile antennas; Mobile communication systems; Mobile radiocommunication systems; Monopoles; Networks and services in france and abroad; Radiocommunications; Services and terminals of telecommunications; Strip; Strips; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Telephone sets; Telephone. Videophone; Teleprocessing networks. Isdn; Universal Serial Bus; USB connector; Wireless communications; WWAN antennas
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2011.2164220

A coupled-fed dual-loop antenna capable of providing eight-band WWAN/LTE operation and suitable to integrate with a USB connector in the mobile handset is presented. The antenna integrates with a protruded ground, which is extended from the main ground plane of the mobile handset to accommodate a USB connector functioning as a data port of the handset. To consider the presence of the integrated protruded ground, the antenna uses two separate shorted strips and a T-shape monopole encircled therein as a coupling feed and a radiator as well. The shorted strips are short-circuited through a common shorting strip to the protruded ground and coupled-fed by the T-shape monopole to generate two separate quarter-wavelength loop resonant modes to form a wide lower band to cover the LTE700/GSM850/900 operation (704-960 MHz). An additional higher-order loop resonant mode is also generated to combine with two wideband resonant modes contributed by the T-shape monopole to form a very wide upper band of larger than 1 GHz to cover the GSM1800/1900/UMTS/LTE2300/2500 operation (1710-2690 MHz). Details of the proposed antenna are presented. For the SAR (specific absorption rate) requirement in practical mobile handsets to meet the limit of 1.6 W/kg for 1-g human tissue, the SAR values of the antenna are also analyzed.