Hi Guys,
Have received customer's reply, apparently he has registered with E14 and saw all the responses for this discussion.
Below is his reply:
"Kind of surprise to see so much information generated. The source is actually an AWG, Arbitrary Waveform Generator. It's a very high frequency signal (a pure sin or square wave), in terms of GHz (Up to 6GHz) and definitely a Bias-T is able to do the job as there is active component inside. Ghamble understands and interprets them correctly. I was just thinking whether there is any cheaper components hence posting a question. Nevertheless, I'd stick with a Bias-T. Thanks for your support! =)"
Hey Ghamble, you have hit the jackpot. Thanks!
Once again, I would like to thank everyone for all the inputs. Customer is amazed with the responses generated from E14 and certainly will be the top of his list when he need any support/info in future. 
Cheers
Kevin
Hi Koh,
There's is plenty of information on the internet etc and the basic circuit I posted show the essential components / theory.
A bias-T is a three port network with signal in, signal out and a DC offset input. The input has a capacitor on it for DC blocking, the DC source is fed in via an inductor to block RF and the whole thing allows the incoming signal to be superimposed if you like on a DC source.
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DC restorer.bmp (248.3 K)
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Dc Restorer2.bmp (248.3 K)
