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What is RF Duplexer – A RF duplexer is a device that is used by tuning a resonant circuits, and with the objective of isolating the transmitter from the receiver. This will then allow the transmitter and the receiver to operate on the same channel/antenna at the same time without the transmitter adversely affecting the receiver path.
In modern telecommunications systems, such as cell phone usage, it requires a full duplex capability, a configuration of their electronic circuity that allows simultaneous transmission and reception by the user. In communication systems that employ a common antenna for use with a transmitter unit and a receiver unit, a RF duplexer interlinks the transmitter unit, the receiver unit, and the common antenna. For example, in a transceiver of a cellular or cordless phone, an antenna may be coupled to the input of the receiver and to the output of the transmitter. A duplexer is used to couple the common signal path to the input of the receiver and to the output of the transmitter.
How does the RF Duplexer works? – The duplexer provides the necessary coupling while prevents the modulated transmit signal which is generated by the transmitter from being coupled from the antenna back into the input of the receiver and overloading the receiver. Duplexing can be achieved in a number of ways, but the method employed usually depends on the system of multiplexing which is used to allow several users to access the telecommunications network at the same time.
A typical RF duplexer is a combination of bandpass and band-reject filters that allow signals from the transmitter to reach the antenna while preventing the transmit signals from reaching the receiver. A dielectric type duplexer uses a dielectric for transmit and receive filters. A composite filter uses a dielectric for one to the transmit and receive filters and a surface acoustic wave (SAW) filter for the other.
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