An Inverted FL Antenna for Dual-Frequency Operation

Author

Nakano, Hisamatsu ; Sato, Yusuke ; Mimaki, Hiroaki ; Yamauchi, Junji

Author_Institution

Coll. of Eng., Hosei Univ., Tokyo, Japan

Volume

53

Issue

8

fYear

2005

Firstpage

2417

Lastpage

2421

Abstract

An inverted FL antenna (InvFLA) is analyzed to obtain dual-frequency operation at 2.45 and 5.2 GHz (wireless LAN system frequencies). The InvFLA is composed of inverted FL elements, a parasitic element, and a ground plate, where these lie in the same plane, i.e., the structure is a card-type structure having a co-planar ground plate. The antenna height above the ground plate is very small: $5.5~ mm=0.045$ wavelength at 2.45 GHz. The analysis shows that the InvFLA has a 4.1% bandwidth around 2.45 GHz and a 31.8% bandwidth around 5.2 GHz, both for a $VSWR=2$ criterion. The gain is calculated to be 0.9 dBi at 2.45 GHz and 1.7 dBi at 5.2 GHz, with a small gain variation in each of the VSWR bands.

Keywords

UHF antennas; antenna radiation patterns; coplanar waveguides; finite difference time-domain analysis; multifrequency antennas; waveguide antennas; 2.45 GHz; 5.2 GHz; 5.5 mm; FDTD; InvFLA; card-type structure; coplanar ground plate; dual-frequency operation; finite-difference time-domain analysis; inverted FL antenna; parasitic element; Acceleration; Antennas and propagation; Bandwidth; Finite difference methods; Frequency; Helium; Microstrip antennas; Time domain analysis; Wireless LAN; Wireless communication; Card-type antenna; dual-frequency operation; finite-difference time-domain (FDTD) analysis; inverted F; inverted L;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2005.852502

Filename

1492584