Dual-frequency circularly-polarized microstrip antenna with switchable polarization sense

Jia Feng Wu, Jeen Sheen Row, Kin Lu Wong

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A dual-frequency circularly-polarized (CP) microstrip antenna capable of switching polarization sense is presented. The antenna is fed by a microstrip line through aperture coupling. First, it is found that a CP mode can be excited when the radiating patch is square and an open-ring slot is used as the coupling aperture. Then, by truncating the radiating patch, another CP mode can be obtained. The two CP modes have reversed polarization senses, and their operating frequencies are different. For the proposed dual-frequency CP microstrip antenna, two prototypes with frequency ratios of 1.07 and 1.23 were constructed, and voltage-controlled diodes are employed to achieve the electrical switching between the two CP modes.

Original languageEnglish
Pages (from-to)2125-2128
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number8
Publication statusPublished - 2008 Aug 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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