So basically a circulator is a ferrite device that has a multiport junction and in it, a wave can travel from one port to the next in one direction. A circulator is passive equipment that is used in RF and microwave equipment. This device can be used to improve the stability, performance, and reliability of the system. The function of the circulator is to absorb the energy entering the port and to pass it to the next port.
The circulator has three or more ports and in this device, the power will be transmitted from one port to the other. Note that the more bandwidth you ask for, the crummier the insertion loss and isolation will be. A really cool type of circulator is a switchable circulator , in which an electrical signal is used to switch the orientation of the circulator from CW to CCW and vice versa.
The way the circulator is constructed it latches into a particular orientation and will stay there in the absence of the electrical signal, say, for instance your power supply goes off. The means for switching the orientation is a single high-current DC pulse that is provided by the driver circuit. This in an expensive technology, but it makes an unbelievably low-loss RF switch with high power handling. Got any good material on circulators and isolators?
Toggle navigation Menu. Filter by alphabets Filter by categories. Circulators Click here to go to our main page on ferrite devices Click here to go to our page on switchable circulators Search for circulators and isolators on EverythingRF. In addition to the ferrite substrate, a magnet is required to make a circulator. Here's a WR Ku-band waveguide circulator we found on Ebay: WR42 waveguide circulator A circulator is sometimes called a " duplexer ", meaning that is duplexes two signals into one channel e.
The loss from port-1 to port-3 is known as Isolation which is quite high about 20 to 25 dB. RF circulator becomes Isolator when one of its port is loaded with matched impedance. For example, if port 3 in the figure-1 is loaded, then power at port-1 is available at port All the reflections from port-2 will go to load at port-3 and port-1 does not get any reflections back. If there is a difference at port-B, the signal can be reproduced from port-B that will be directed toward port C.
The circulators are classified into two types namely ferrite circulators and non-ferrite circulators. This revolving can depend on the communication of the electromagnetic signal by magnetized ferrite. The transmitter energy turns in an anticlockwise direction toward the antenna port.
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