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Circularly Polarized Patch Antennas


Circularly Polarized Patch Antennas

Patch antennas are widely used in wireless communication because they are low-profile and easy to integrate into circuit boards.

Microstrip Patch Antenna

A microstrip antenna consists of:

  • Metal patch
  • Dielectric substrate
  • Ground plane

Resonant Frequency

The resonant frequency of a rectangular patch is approximately:

f = c / (2L√εeff)

Circular Polarization

Circular polarization can be achieved by:

  • Corner truncation
  • Dual feed methods
  • Offset feeding

Advantages

  • Orientation independence
  • Better multipath performance
  • Improved wireless reliability

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