How do we connect 3 RF receivers each other??

Please explain how do we connect 3 RF receivers(AD8347) each other?? iam connecting it to the PC

What do you mean, the antenna input or the output?
If it's the antenna, would a switch do? or do you want them connected at the same time?

You'd need to be more precise with what you want, and the circuit you have. Not everyone is interested to read (or knows by heart) the datasheet for this AD8347, and we can't guess how your system is installed.

Christian

This is the actual block diagram of my Antenna system.Please check this out.

Aah, now this is much clearer.

Now I'm not an expert in RF design, especially in those frequencies, so the easiest solution would be to have a seperate antenna each RX.
If you can't do that, you could try just directly connecting the antenna to each receivers, though I doubt you will get good results with this. It might work, but with sub-optimal reception.
The best (I think) would be a divider circuit (like a "cable splitter" for TV signals, which is just a transformer and a bunch of connectors) or maybe a pre-amp after the antenna, feeding the three receivers at the right impedance.

I like the 3-antenna solution best p-)

Good luck,
Christian

Thanks for your solution..But I have 2 antenna elements(Microstrip antenna) on the receiver side...I need to connect it with 2 different antenna elements with 2 RF receivers...But how do we interface 3rd receiver?? And also can you please mention how do we interface with PC for matlab coding?? I mean how do we cable it??

If your antennas are microstrip, every RX should have one, no?
Are these 2-element antennas? If so, I don't think you connect
1 element to each radio...

I think that for GHZ+ frequencies, a simple piece o'wire just
won't do... then again I have no clue.

As for interfacing to the PC, again it's going to be more complicated
than just plugging one end to the other. On your block diagram
you mention "BPSK signal at baseband". I.E. 0 Hz?
And you say 'sampling at 40MSPS' . You won't be able to do that
real-time with 3 signals, I don't think. Or you won't be able to
store data fast enough. I suppose you don't have an acquisition
system? Just that is a project in itself...

Again, you'll have to be more precise as to what you have, your
requirements, etc. for people to be able to help. Nobody reads
minds.

Thanks a lot man..I appreciate your help...Iam giving the link of the project which will be useful to tell me the exact solution.There are some pics inside the document..

**broken link removed**

I think you should know better than me. The goal of the project seems to be that you find a solution.

"Each receiver chain makes the conversion from RF to baseband, samples it at 40 Msamples/s with 10-bit precision sends the samples to computer by means of network interface module for post processing in Matlab."
I would say, connect the "network interface module" to your computer.

That's all I can say to help, because I know 0 about that kind of RF comms.

Note that other forum members might have the impression that you're asking them to do your job. It surprises me that no one has said "do your homework first, then we'll help" yet. So at least try to help yourself, and then prove to us that you did some work/research...

ok..Thanks for reminding me...I have only 1 question...what kind of cables are used to connect Rf receivers chain??

Your question is wrong. You do not need to connect receivers to each other but all three through network interface module to computer. And each receiver has it's own antenna. Block diagram is bad I think.
Antenna cable should be low loss as usual.

How 'bout :
http://www.acehardware.com/product/...w=cable&parentPage=search&searchId=5688079496

Or, for big signals : http://www.pipeplus.com/