A Quasi Yagi Antenna Backed by a Metal Reflector

Author

Melais, Sergio E. ; Weller, Thomas M.

Author_Institution

Dept. of Electr. Eng., Univ. of South Florida, Tampa, FL

Volume

56

Issue

12

fYear

2008

Firstpage

3868

Lastpage

3872

Abstract

A quasi Yagi antenna is presented that provides off-axis radiation when backed by a metal reflector. The off-axis radiation pattern is achieved by an increase in the substrate thickness beneath the antenna elements. At 2.4 GHz the antenna demonstrated a bandwidth of 190 MHz, beam tilt towards the end fire direction (thetas = 42^deg) , maximum gain of 4.5 dB, and a radiation efficiency of 87%. The results of a study on bandwidth, gain and radiation pattern versus substrate thickness are presented herein. To the best of the authors´ knowledge previous realization of this antenna over a ground plane has not been investigated.

Keywords

UHF antennas; Yagi antenna arrays; antenna radiation patterns; bandwidth allocation; beam steering; reflector antennas; bandwidth allocation; beam steering; end fire direction; frequency 2.4 GHz; metal reflector; off-axis radiation pattern; quasiYagi antenna; substrate thickness; Antenna radiation patterns; Bandwidth; Dielectrics; Directive antennas; Fires; Microstrip antenna arrays; Microstrip antennas; Periodic structures; Surface impedance; Yagi-Uda antennas; Beam steering; Quasi Yagi; end fire; metal backing;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2008.2007403

Filename

4718026