Circular polarized antenna not working

[wanyancan]

Hi,

I was trying to test a slot circle antenna with nRF52832 which is well matched to 2.4G~2.48GHz, but it is circular polarized antenna with high directivity. 

However, I can't use nRF52832 DK board to receive any bluetooth signal no matter how close between the TX board and DK board.

Is it because the DK board is using linear polarized monoopole antenna?

If I point two exact same circular polarized antennas at each other, the circular direction is reversed to each other. One is clock-wise and the other is anti-clockwise (looking info one direction)

What is the best way to design a very high directivity antenna for this n52 chipset ?

Best Regards,

Leo

[ketiljo]

You will only have 3 dB loss when a linear antenna is used with a circular polarized antenna. So it must be something else that cases the link to be broken.

If you have circular polarized antennas in both ends of the link, they must have the same polarization (made equal), else the loss will be very high (~30 dB).

If you by very high gain mean >20 dB, you are looking at yagi antennas that are of course very large. Less gain, <8 dBi, can be archived by patch or slot antennas.

 

[wanyancan]

Thank you for your infomation!!! I just found that the code got stuck at checking NRF_CLOCK->EVENTS_HFCLKSTARTED ==0

Not sure what's the cause yet. 

I'm very glad to know that CP antenna won't have too much loss with linear antenna. THANK YOU