Ground splitting for Custom PCB with two transceivers

RE: Ground splitting for Custom PCB with two transceivers

ketiljo — Mon, 06 Jul 2020 11:57:14 GMT

I wouldn't separate the ground planes.

RE: Ground splitting for Custom PCB with two transceivers

Lynn Zhou — Fri, 03 Jul 2020 15:14:47 GMT

Thanks for your reply.

We are not willing to receive any data packet from anyone when the full-duplex TX/RX is running. We want to use it as a small sensing radar. Thanks for reminding. I'm not willing to put two antennae on the same board but using a cable to connect them.

So you don't think it's necessary to do TX/RX ground separation or any digital/analog ground separation?

RE: Ground splitting for Custom PCB with two transceivers

ketiljo — Thu, 02 Jul 2020 11:39:17 GMT

The performance of the antennas will be better if you have a ground plane that's as large as possible. This is especially important on small designs It's not the ground plane that will cause interference.

If you intend to operate both the RX and the TX in the same frequency band, the RX will not be able to receive anything while the TX is operating. The coupling between the two antennas will be too great on a small board. So if the TX is operating continuously, the RX will not function. You can't use a filter either.