Dual-band circularly polarized microstrip antenna

Jhe Sheng Yang, Jeen Sheen Row

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A design for dual-band circularly polarized microstrip antennas with different radiation patterns is described. The design is based on a stacked patch antenna composed of an upper circular patch and a lower ring patch. For the higher operation band, the two patches are simultaneously resonant at the TM21 mode and the stacked patch antenna can produce a conical radiation pattern. As for the lower operation band, only the upper patch is resonant at its fundamental mode and a broadside radiation pattern is obtained. To allow the two radiation patterns to be with circular polarization, 90° hybrid couplers are used to excite the patch antennas at the two operation bands. A prototype designed at the GPS and WLAN bands is constructed. The experimental results demonstrate that the prototype operated at each frequency band has a 3dB-axial-ratio bandwidth of more than 15%. Simulation performed with HFSS also validates the measured results.

Original languageEnglish
Pages (from-to)404-408
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number2
Publication statusPublished - 2017 Feb 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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