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EMAX PAGODA II ANTENNA 50MM RHCP SMA Side

EMAX PAGODA II ANTENNA 50MM (RHCP) (SMA) (2pcs)

$ 11.49 $ 14.99

**These are the short versions

Details:

Introducing the Emax “Pagoda II” by design by Maarten Baert. This thoughtfully designed circular polarized antenna utilizes a 3 tiered 1 oz copper PCBs to replace the typically fragile wire elements. The antenna only weighs 8 gm and will include the optional heavy duty polyolefin heat shrink to help protect PCB from damage. The Pagoda II has a very good axial ratio measurement <1.3 and SWR of 1.2.
It will work great as either TX or RX antenna and for best performance we recommend using it as matched set. They will be sold in a set of 2 antennas with the option for Stubby at 50mm and Standard 85mm lengths. Initial sets will be RHCP but LHCP sets will soon follow. 

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:

 

3D radiation pattern. Look at the 2D version if you actually want to see the numbers.

Simulation model.

 

 

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

 

 

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

 

 

Simulation model.

 

 

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

 

 

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

 

The 'best case' and 'worst case' correspond to different assumptions about what happens to signals that travel along the outside of the coax. In the 'best case' simulation, these are completely absorbed at the other end of the coax. In the 'worst case' simulation, they are completely reflected back towards the antenna. The latter case usually results in standing waves on the outside of the coax, which causes the coax itself to radiate and interfere with the radiation pattern of the antenna. This is why the radiation pattern isn't smooth anymore. The reality will be somewhere between these two extremes.

Measurements

VNA measurements.

 


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