A frequency-reconfigurable quasi-Yagi dipole antenna

Yong Cai*, Y. Jay Guo, Andrew R. Weily

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


A new frequency-reconfigurable quasi-Yagi dipole antenna is presented. It consists of a driven dipole element with two varactors in two arms, a director with an additional varactor, a truncated ground plane reflector, a microstrip-to-coplanar-stripline (CPS) transition, and a novel biasing circuit. The effective electrical length of the director element and that of the driven arms are adjusted together by changing the biasing voltages. A 35% continuously frequency-tuning bandwidth, from 1.80 to 2.45 GHz, is achieved. This covers a number of wireless communication systems, including 3G UMTS, US WCS, and WLAN. The length-adjustable director allows the endfire pattern with relatively high gain to be maintained over the entire tuning bandwidth. Measured results show that the gain varies from 5.6 to 7.6 dBi and the front-to-back ratio is better than 10 dB. The H-plane cross polarization is below -15 dB, and that in the E-plane is below -20 dB.

Original languageEnglish
Article number5565382
Pages (from-to)883-886
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Publication statusPublished - 2010
Externally publishedYes


  • Endfire antennas
  • reconfigurable antenna
  • varactors


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