Frequency reconfigurable quasi-Yagi dipole antenna

Author

Cai, Y. ; Guo, Y. Jay ; Qin, P.Y. ; Weily, A.R.

Author_Institution

ICT Centre, CSIRO, Epping, NSW, Australia

fYear

2010

fDate

11-17 July 2010

Firstpage

1

Lastpage

4

Abstract

A frequency reconfigurable quasi-Yagi dipole antenna is presented in this paper. Simulation results show that a 35% continuously tuning impedance bandwidth, from 1.85 to 2.5GHz, is obtained. Loaded with varactor diodes, the effective electrical lengths of the driver and director dipoles are varied by changing the biasing voltages. The length adjustable director allows the endfire pattern with relatively high gain being maintained over each tuning sub-band. Across the tuning bandwidth, the predicted gain variation is from 5.8dBi to 7.9dBi. The H-plane cross-polarization level is below -17dB while this value is below -32dB in the E-plane. The front-to-back ratio is better than 12dB.

Keywords

dipole antennas; driver circuits; optical tuning; varactors; H-plane cross-polarization level; biasing voltages; continuously tuning impedance bandwidth; director dipoles; driver; frequency 1.85 GHz to 2.5 GHz; frequency reconfigurable; front-to-back ratio; length adjustable director; predicted gain variation; quasi-yagi dipole antenna; tuning bandwidth; tuning sub-band; varactor diodes; Bandwidth; Dipole antennas; Gain; Tuning; Varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2010 IEEE

Conference_Location

Toronto, ON

ISSN

1522-3965

Print_ISBN

978-1-4244-4967-5

Type

conf

DOI

10.1109/APS.2010.5560980

Filename

5560980