. Airborne radar. Airplanes; Guided missiles. 10-16] MICROWAVE FERRITE DEVICES AND THEIR APPLICATION 559. control of polarization, is utilized in a number of different types of ferrite devices. The Microwave Gyrator. One of the most fundamentally important nonreciprocal ferrite elements is the microwave gyrator.^"^ The gyrator is a two-port circuit element, ideally lossless, having an electrical length which is greater by 180° in one di- rection of transmission through it than in the other. It can be repre- sented schematically as in Fig. 10- 31. A 90° Faraday rotator has the nonreciproca
. Airborne radar. Airplanes; Guided missiles. 10-16] MICROWAVE FERRITE DEVICES AND THEIR APPLICATION 559. control of polarization, is utilized in a number of different types of ferrite devices. The Microwave Gyrator. One of the most fundamentally important nonreciprocal ferrite elements is the microwave gyrator.^"^ The gyrator is a two-port circuit element, ideally lossless, having an electrical length which is greater by 180° in one di- rection of transmission through it than in the other. It can be repre- sented schematically as in Fig. 10- 31. A 90° Faraday rotator has the nonreciprocal property required of a gyrator, while another form of gyrator is based on a direct differential phase shift of 180° obtainable in a rectangular waveguide ferrite component. Several other microwave gyrator elements are known. The Circulator. One of the most important and valuable applications of the gyrator is in a nonreciprocal network called a circulator. This multiport network is characterized by nonreciprocal coupling properties such that a signal entering one port is coupled out a second port, a signal entering the second port is coupled out a succeeding port, etc., while a signal entering the last or «-th port couples to the first port. This coupling property is illustrated schematically in Fig. 10-32. Ideally there is no Fig. 10-31 Schematic Representation ot 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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