Many RF test and measurement applications require the use of directional couplers, whether standalone or as an integral part of test instruments such as directional wattmeters. Typically, a directional coupler is a four-port device; the ports might be labeled input, output, forward and reverse. A four-port coupler also is called a bidirectional coupler. Important specifications for directional couplers are main line insertion loss, frequency range, coupling factor, directivity, coupling ...

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