Duplexer is a device which allows a mobile phone to operate like a wired telephone, with either or both people speaking at any time without using a microphone switch to enable the radio transmitters.

The branch-line duplexer is a relatively narrowband device because it relies on the length of the waveguides that connect the switches to the main waveguide. This type of duplexer generally has been replaced by the balanced duplexer in modern radars.

Duplexer is a device which allows sharing a single antenna for receiver operating on a frequency signal and transmitter operating on different frequency.

The task of the duplexer is to coordinate the time sharing of the transmission and reception activities with the least of interaction and degradation of the two radio frequency signals.

Diplexer

Diplexer is like multiplexer. Diplexer is a three-port, frequency-dependent device that used to separate or to combine of different signals from an antenna.

A typical diplexer consists of two fixed tuned band-pass filters that share a common port. The common port and the output of the two filters form the three terminals of the diplexer. Signals applied to the common port are separated in accordance with the pass band frequencies of the filters.

Radio Frequency Duplexer

Radio frequency duplexers’ type consists of surface mount, flat pack, through-hole, plug-in, and waveguide assembly techniques. Most important performance specification needs to be considered when selecting RF duplexers are signal rejection of the receiver over transmission signal and vice versa, insertion loss, and Voltage Standing Wave Ratio (VSWR).

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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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