RADAR T/R cell

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The T/R (transmit/receive) cell is used to protect the front-end of a RADAR receiver from the outgoing pulse from the transmitter, which shares the same antenna and transmission line system. This obviously requires a very rapid switch with very high isolation, as the outgoing pulse is many orders of magnitude greater than the return signal, which is received within a fraction of a millisecond.

This is achieved by the outgoing pulse indirectly striking an arc in the waveguide, effectively shorting it and preventing any signal passing it. The adjustment on this example allows the gap size to be altered via a copper bellows.