A reconfigurable design for bandwidth enhancement of circularly polarized slot antennas

Tsung Hsun Hsieh, Jeen Sheen Row

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A reconfigurable design is proposed to improve the circular polarization (CP) operating bandwidth of an annular-ring slot antenna fed with an L-shaped coupling strip. The design involves four voltage-controlled varactor diodes, which are placed below the slot and symmetrically distributed along the circumference of the slot. When all antenna dimensions remain constant, the CP operating frequency of the slot antenna can be decreased by varying dc voltage values. In addition, theses CP operating frequencies, which are corresponding to different dc voltage values can form a successive frequency band, and the available CP bandwidth is thus improved. Experimental results indicate that with the reconfigurable design, the 3-dB axial-ratio CP bandwidth can be increased by a factor of 4 for the annular-ring slot antenna with a reflector.

Original languageEnglish
Pages (from-to)1377-1380
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number6
Publication statusPublished - 2010 Jun 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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