. Airborne radar. Airplanes; Guided missiles. 10-16] MICROWAVE FERRITE DEVICES AND THEIR APPLICATION 561 Switches. There are numerous ways in which ferrites can be used for microwave switching. For example, reversing the direction of the magnetic biasing field applied to a circulator will reverse the direction of circulation in the device ( the direction of the arrow in Fig. 10-33 reverses with direction of applied field). In this manner a four-port circulator can be used as a reversing switch for such applications as lobe switching. A solenoid-controlled 90° Faraday rotator can be used to
. Airborne radar. Airplanes; Guided missiles. 10-16] MICROWAVE FERRITE DEVICES AND THEIR APPLICATION 561 Switches. There are numerous ways in which ferrites can be used for microwave switching. For example, reversing the direction of the magnetic biasing field applied to a circulator will reverse the direction of circulation in the device ( the direction of the arrow in Fig. 10-33 reverses with direction of applied field). In this manner a four-port circulator can be used as a reversing switch for such applications as lobe switching. A solenoid-controlled 90° Faraday rotator can be used to switch an input signal between two orthogonal output ports of a dominant mode circular waveguide. With a slightly different geometry, a reversible 45° rotator can accomplish the same thing. The first switch type is bidirectional, but has the property of a gyrator when the magnetic field is applied. The second type functions as a reversible three-port circulator and as such is not bidirectional. It should be evident that in applying a ferrite component it is important to consider whether or not it is a reciprocal device. Fig. 10-35 shows an experimental four-port reversible ferrite switch which is. Fig. 10-35 Experimental Model of a Four-Port, Reciprocal Ferrite Switch. Two Faraday Rotation Gyrators are Used, and Switching is Accomplished by Reversing the Current in One of Them. ( Naval Reasearch Laboratory.) reciprocal, and consequently bidirectional. Two 90° Faraday rotators are used with two magic-tee hybrids in a symmetrical bridge circuit. Switching is accomplished by electronically reversing just one of the 90° rotators. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Povejsil, Donald J. Princeton, N. J. , Van Nostrand
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