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The Triple Feed Patch antenna is a directional circularly polarized antenna that I created in collaboration with Robin Theunis, one of my co-workers. The main design goals were:

  • Good radiation efficiency. Most FR4-based patches have terrible efficiency because FR4 is very lossy at 5.8 GHz.

  • Good axial ratio, not just directly perpendicular to the patch but also off-center.

  • Cheap and easy to manufacture with high accuracy, even for a hobbyist.


  • Center frequency: 5.8 GHz

  • Bandwidth: 660 MHz (5.47 – 6.13 GHz)

  • Matching: S11 < -20 dB, VSWR < 1.22 (at center frequency)

  • Axial ratio: < 1.3

  • Antenna gain: 9.4 dBi

  • Half power beam width: 55° (horizontal and vertical)

  • Radiation efficiency: 83.5%

These values are based on simulation, actual measurements are below (they are very similar). The center frequency may shift a bit between batches as a result of variations in the dielectric constant of FR4. Also, not all brands of FR4 have the same dielectric constant. Frequency shifts up to 100 MHz are normal.

Package includes:
1 x Antenna
1 x semi rigid SMA extension
1 x Dummy Load SMA 

Current Stock:
1.50 Ounces
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