Circularly polarized annular slot antenna with switchable frequency

Chuen Ching Wang, Mu Yi Chen, Jeen Sheen Row

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A design for frequency reconfigurable annular slot antennas with circular polarization (CP) is described.The slot antenna is excited with a shorted microstrip line through coupling, and one varactor diode placed on the slot is used to generate CP radiation. By controlling the dc bias of the varactor, the CP operating frequency of the slot antenna can be switched between two frequencies with a frequency ratio of about 1.6; moreover, the antenna operating at each CP frequency has a return loss of less than 10 dB and the broadside radiation with a peak gain of higher than 3 dB.

Original languageEnglish
Pages (from-to)1115-1118
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number5
Publication statusPublished - 2013 May 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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