The Pagoda antenna is an omnidirectional circularly polarized antenna design that I created. My main design goals were:
- Good omnidirectional radiation pattern.
- Good axial ratio.
- Reasonably small.
- Easy to manufacture within fine tolerances at low cost, even for a hobbyist.
I did not try to make any specific aspect "perfect", because this usually comes at the expense of other aspects, and they are all quite important.
I quickly realized that the easiest and cheapest way to get arbitrary shapes manufactured within fine tolerances is to use regular PCBs. Of course this limits the design to flat shapes, so the real challenge was finding a design with a minimal number of PCBs that would achieve the desired properties. The final design is the result of months of simulation and tuning. I won't claim that this design is perfect, but it does seem to have a smoother radiation pattern and a significantly better axial ratio than most other antennas.
|Radio frequency (megahertz)
|30 - 80
|Antenna gain (dBi)
|Left hand circular polarized (LHCP) - Right hand circular polarized (RHCP)
|RF connector type
|SMA - RP-SMA