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Pin Diode Antenna Transmitt/Receive Switches Circuit

2015-10-14 10:14  
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Transmitt/Receive Switch (T/R Switch) Circuitis appeared in the diagram below. Transmit / Receive Antenna Switches are commonly used to connect the transceiver’s antenna to either the Transmitter port or the Receiver port. This is one of the most important control circuit applications for specific wireless system applications using PIN diodes.

Transmitt Receive Switches Circuit (T R Switch)

This quarter wave antenna switch is a narrow band SPST switch configured to switch the Antenna Port. When both pin diode D1 & D2 are forward biased, the transmitter is connect to the Antenna, and the Receiver is protected by the isolation network of D2 terminating the quarter wavelength line.

When D1 & D2 are reversed biased, the Transmitter Port is isolated by D1, and the quarter wavelength line and the Receiver Port are connected to the Antenna. The biasing scheme is requiring only one RF Choke Coil and a few d-c blocking capacitors.