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===Duplexer=== In [[radar]], circulators are used as a type of [[duplexer]], to route signals from the [[transmitter]] to the [[antenna (radio)|antenna]] and from the antenna to the [[radio receiver|receiver]], without allowing signals to pass directly from transmitter to receiver. The alternative type of duplexer is a ''transmit-receive switch'' (''TR switch'') that alternates between connecting the antenna to the transmitter and to the receiver. The use of chirped pulses and a high dynamic range may lead to temporal overlap of the sent and received pulses, however, requiring a circulator for this function.
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