A Small Dual-Band Inverted-F Antenna With a Twisted Line

Author

Kim, Jae Hee ; Cho, Won Woo ; Park, Wee Sang

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang

Volume

8

fYear

2009

fDate

7/1/1905 12:00:00 AM

Firstpage

307

Lastpage

310

Abstract

A twisted-line inverted-F antenna (IFA) is proposed for dual-band applications. The antenna features a twisted line for dual bands and a parasitic line for additional resonance. The twisted-line IFA has wideband characteristics in the high frequency band due to the mergence of the resonances of the twisted line and the parasitic line. The electric size of the antenna is 0.109 lambda x 0.025 lambda x 0.0025 lambda, and its length is about 44% that of a conventional IFA. The twisted-line IFA was fabricated on a thin FR4 substrate, and its performance was measured. The antenna operates at 930 MHz with a bandwidth of 30 MHz, and at 1.7 GHz with a bandwidth of 350 MHz for S11 less than -6 dB; the maximum radiation efficiencies were 48% at 937 MHz and 80% at 1.645 GHz.

Keywords

UHF antennas; antenna radiation patterns; broadband antennas; multifrequency antennas; planar inverted-F antennas; bandwidth 30 MHz; bandwidth 350 MHz; frequency 1645 MHz; frequency 1700 MHz; frequency 930 MHz to 937 MHz; parasitic line IFA fabrication; thin FR4 substrate; twisted line dual-band planar inverted-F antenna; twisted-line IFA fabrication; wideband antenna radiation; Dual band; inverted-F antenna (IFA); parasitic line; twisted line;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2009.2015345

Filename

4785153