AstroX ULTRA Pagoda-2 5.8g Antenna (RHCP)





Good omnidirectional radiation pattern.

Good axial ratio.

Reasonably small.


Designed by Maarten Baert



Specifications


Center frequency: 5.8 GHz

Bandwidth: 500 MHz (5.55 – 6.05 GHz)

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

Axial ratio: < 1.3

Radiation efficiency: 95%


Originally the radiation efficiency was listed as 92%, this was a mistake. 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.


Radiation Pattern





Best case, vertical cross-section taken at various angles.





Worst case, vertical cross-section taken at various angles.