Thankyou for your reply,
Actually that was my confusion that the several papers that I saw there were two frequencies mentioned. and I tried both with changing the RC value for impedance matching to get same output as input and found out that the frequency less than 125K it is working well
1. What frequency (low, high, or moderate) is recommended for this case, or how should I finalize a specific frequency, just at which my circuit works well?
2. if I am getting the exact output on the receiver side from the transmitter input, do I still need to do an impedance matching check?