A Four-Antenna System With High Isolation for Mobile Phones

Author

Jingli Guo ; Jiachang Fan ; Ling Sun ; Baohua Sun

Author_Institution

Nat. Key Lab. of Antennas & Microwave Technol., Xidian Univ., Xi´an, China

Volume

12

fYear

2013

fDate

2013

Firstpage

979

Lastpage

982

Abstract

In this letter, a four-antenna system with high isolation for mobile phones is presented. The antenna system, which consists of one main antenna and three auxiliary antennas, is located on the phone circuit board with a size of 135 × 65 × 0.8 mm³. The main antenna located on the top of the circuit is used to send and receive signals, which adopts improved monopole antenna, to cover LTE700/2300/2500, GSM850/900/1800/1900/UMTS, and 2.4-GHz WLAN bands efficiently. Three auxiliary antennas with the same size of 40 × 6 × 0.8 mm³ are respectively located along the two vertical sides and the bottom of the circuit board. As receiving antennas, these auxiliary antennas work in the 1880-2690-MHz band. By suitable arrangement and design, the isolation between antennas of higher than 15 dB can be obtained, and the efficiency of the antenna system in the working frequency band reaches 40% or above, which can meet the requirements of antenna performance in mobile communication area.

Keywords

3G mobile communication; Long Term Evolution; UHF antennas; mobile antennas; mobile handsets; monopole antenna arrays; multifrequency antennas; wireless LAN; GSM; LTE; UMTS; WLAN band; auxiliary antenna; circuit board; four antenna system; frequency 1800 MHz; frequency 1880 MHz to 2690 MHz; frequency 700 MHz; frequency 850 MHz; frequency 900 MHz; high isolation antenna system; main antenna; mobile phone; monopole antenna; receiving antenna; size 0.8 mm; size 135 mm; size 40 mm; size 6 mm; size 65 mm; Antenna measurements; Mobile antennas; Mobile handsets; Printed circuits; Receiving antennas; Wireless LAN; Coupling feed; four-antenna system; high-isolation antenna;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2013.2273551

Filename

6572850