Transmit-Isolating Receive (TIRx™) RF Front-End
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The TIRx™ RF Front-End is a patented
four-port devices that permits high-isolation
routing of transmit and receive signals provided
to and retrieved from the bi-directional port to
which an antenna element is connected, as well as
to and from a second, identical, bi-directional
port to which the user connects an impedance that
replicates the antenna impedance versus frequency.
The presence of this second bi-directional
port – which PSI calls the “ANTENNA BALANCE” port
(2B) – is one important characteristic that
distinguishes a TIRx™ from conventional
ferrite circulators.
At any frequency where the impedance
presented to ports 2A and 2B equal to one another,
the transmit signal at port 1 will be routed to
the antenna connected to port 2A, and the signal
received by the antenna will be routed to port 3,
but port 3 will be substantially isolated from
port 1 –
i.e., the front end will have excellent “T/R
isolation”. |
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TIRx™
has bandwidth and isolation of a broad
bandwidth switch and the simultaneous T/R
capability of a circulator.
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Measured Isolation Over Frequency of Broadband TIRx™
* US Patents 7,555,219;
7,809,216; 7,826,751.
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