Off-board antenna design

Tal.Ram · ‎2016-04-26

Posted on April 26, 2016 at 17:05

Hi, for our application we must use an off-board antenna, which will be a PCB antenna and will be connected via coaxial cables to CR95HF IC.

As I see it, the matching components should be located on the antenna side (on PCB) and on the CR95HF and host MCU should be just the connectors straight to the Rx1, Rx2, Tx1, Tx2 lines. Am I correct? does it sounds right to connect both PCB's by those 50 ohms coax cables?

And a not related questions-

1. why there are two Rx inputs and two Tx outputs in the IC?

2. which i/f is used in the CR95HF Demo board, SPI or UART?

Thanks!

Ram

#cr95hf

Peter Boringer · ‎2016-07-06

Posted on July 06, 2016 at 18:07

Yes this might be operational, but not optimized. Take care of the effect of the coax with the output impedance of the CR95HF. Take care also that RX and TX be differential, this is the reason why there are two RX inputs pins and same for TX.

By default you should have SPI link on CR95HF.

View solution in original post

Peter Boringer · ‎2016-07-06

Posted on July 06, 2016 at 18:07

Yes this might be operational, but not optimized. Take care of the effect of the coax with the output impedance of the CR95HF. Take care also that RX and TX be differential, this is the reason why there are two RX inputs pins and same for TX.

By default you should have SPI link on CR95HF.