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Types of Bifilar Lines The bifilar lines are usually supported a fixed distance apart. Insulating rods, called spacers, or molded plastics, such as polystyrene, provide the support. The spacers have to be placed at short intervals to prevent the wires from moving apart from each other. The lines are air-insulated, because this is the medium between them. The spacers have little effect on the impedance behavior of the line. Flexible dielectrically separated (molded) lines have several advantages over air-insulated types.
R. E. , New York: McGraw-Hill, 1992. 3. A. W. , The Handbook of Antenna Design, London: Peter Peregrinus, 1986, Vols. 1 and 2. 4. H. Jasik, Antenna Engineering Handbook, New York: McGrawHill, 1961. ANTENNA ARRAYS 5. W. L. Weeks, Antenna Engineering, New York: McGraw-Hill, 1968. 6. S. Ramo, J. R. Whinnery, and T. , New York: Wiley, 1994, pp. 678–682. 7. R. H. Golde, Lightning, New York: Academic Press, 1981, Vols. 1 and 2. 8. D. M. Pozar, Microwave Enginering, Reading, MA: Addison-Wesley, 1990. 9.
The ferrite phase shifter is the result of combining two properties of this medium: the dependency of the velocity of the propagating waves on the direction of propagation and the application of a bias magnetic field. Ferrite is an anisotropic medium. Therefore, the propagation constant (and the velocity of propagation) depends on the bias applied to the sample. The anisotropic properties of ferrites also depend on whether a magnetic field is applied. This is a macroscopic result of the microscopic interaction of the fields with atomic nuclei.