Application of Radio Frequency Circulator

　　In various RF circuit design applications, RF circulators have multiple applications. Usually they tend to be used at microwave frequencies, so they are commonly referred to as microwave circulators.

　　Duplex: One of the most obvious and common applications of RF circulators is in radar systems or wireless communication systems, where the transmitter and receiver use a common antenna.

　　For example, the transmitter output is connected to port 1, the antenna is connected to port 2, and the receiver is connected to port 3. Therefore, the transmitter power will loop to the antenna instead of the receiver, and the signal received by the antenna will loop to the receiver In this way, the receiver is isolated from the transmitter, but the antenna has power from the transmitter and transmits the received signal to the receiver without any mechanical switching.

　　RF isolator: RF circulators can be used as RF isolators. These are very useful for protecting transmitter output amplifiers that must operate at high VSWR levels. If directly connected to the antenna in these situations, the power amplifier may withstand high voltage or current levels, so the amplifier may be damaged by them. Usually, transmitters need to operate over a wide bandwidth, and in these cases, it is not possible to maintain good impedance matching across the entire bandwidth, and the destructive level of VSWR may be observed. To overcome this problem, a circulator can be used to protect PA from the influence of reflected power.

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