Principal Engineer Ian Graham
explores a common question in
radio system design: whether
to deploy duplexers or to use
separate transmit and receive
TO USE A
What is a duplexer?
A duplexer is a three port filtering device which allows transmitters and
receivers operating at different frequencies to share the same antenna.
A duplexer typically consists of two band pass filters connected in parallel.
One filter provides a path between the transmitter and the antenna, the
other provides a path between the antenna and the receiver. No direct
path between the transmitter and receiver exists.
On the face of it, using a duplexer to reduce
the number of antennas required by the
system sounds like a great idea. But, as usual
with RF, it is never quite that simple…Let’s
examine the technicalities of both approaches.