What is a Triplexer?

A triplexer is a 4-port filtering device that splits one input in to three different outputs each with a different frequency. It can also be used the other way round and where it routes signals at three different frequencies to a single port. A triplexer enables a single co-axial cable to run into the feed of three different antennas.

This bi-directional device usually consists of 3 bandpass filters with different passband frequencies. A triplexer is ideally used in smartphones, radar and other wireless transmitter and receiver systems.

For example, a triplexer can be used for a multi-band wireless system, which has three channels - 0.8 to 1 GHz for GSM/CDMA, 1.5 - 1.6 GHz for GPS and  2.4 to 2.5 GHz for WLAN. A single antenna can receive the signal and route the 0.8 to 1 GHz signal to port 1 of the triplexer, the 1.5 - 1.6 GHz signal to port 2 and the 2.4-2.5 GHz signal to port 3. This way a single broadband antenna can be used to receive three different signals.

When selecting a triplexer it is important to evaluate signal isolation between each of the three ports.

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