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An Inverted FL Antenna for Dual-Frequency Operation

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4 Author(s)
H. Nakano ; Coll. of Eng., Hosei Univ., Tokyo, Japan ; Y. Sato ; H. Mimaki ; J. Yamauchi

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.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:53 ,  Issue: 8 )