RF Transceiver

Hi,
Currently, i'm involved in a RF transceiver design project. i am a novice in this field. a brief desciption of the project:

A single antenna can be used for both transmit and receive in a duplex system by allowing bothreceiver and transmitter to be connected to the antenna while preventing the transmit signal from directly entering the receiver. All the active devices can be actively integrated into the antenna producing a compact and low cost system using microstrip antenna. The design will require good isolation between the transmitter and receiver usually greater than 100dB so that they can operate simultaneously. Separated frequency bands are usually used for transmit and receive systems. The high performance RF transceiver is designed for applications like intercom system, security, telemetry, wireless modem, personal beeper, local wireless network, wireless portable handheld devices.


I need a good reference and ideas how to implement this.

Thank you very much

100dB isolation between RX and TX for a low-cost full-duplex system is a little bit hard to get.
For example CDMA mobile system has something close to 70dB rejection of the TX signal in RX band (50dB rejection from duplexer, and 20dB rejection from RX BPF filter).
I don’t think you need this high rejection for a low-power system, if the split between TX and RX frequency is high enough (as in cellular bands).

Visit http://www.maxstream.net/

for lower power visit http://www.lprs.co.uk

need know the frequency of transmitter and receiver.
some system like you can get 120dB isolation between RX and TX use some cheap filters.

hi how we access it