The coupling/decoupling network consists of two parts: coupling and decoupling. The function of decoupling is primarily to prevent useful signals from leaking to the power supply end (AE port) while also preventing interference from the power supply end from affecting useful signals. The function of coupling is to transmit the disturbance signals from the equipment under test (EUT port) to the signal port (RF port) for measurement by the test instrument, or to transmit the electromagnetic disturbance signals from the radio frequency transmitter to the equipment under test.
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