Broadcasting Telecasting (Jul-Sep 1956)

ItlUTES-a milestone in communications engineering! In today's communications engineering, ferrites are ranked with transistors in importance. Ferrites, modern cousins of the ancient lodestone, have more than doubled the efficiency of radar and microwave operations. The ferrites are magnetic but, unlike natural ferromagnetic materials they resist electrical current. Replacing one of the iron oxide molecules in the lodestone formula with the oxide of any one of a number of metals results in a product which is similar in chemical and crystal structure to the lodestone but is resistant to electric current A few of the achievements for these strange new substances are : 1. Simultaneous sending and receiving on a single microwave antenna. 2. Full-potver transmission in microivave ranges with no power loss or interference. 3. Elimination of frequency drifts in microioave transmission. This new group of solid state materials makes possible the continuous search by radar, instead of the intermittent "pulse" sending and receiving of World War II. To fully understand all the implications and probable uses for ferrites, reserve your copy of this special October Proceedings of the IRE ferrites issue. It will take its place in the history of radio-electronics along with the transistor issue of November, 1952, and the solid-state electronic issue of December, 1955. You will want to read and refer to it for years to come! OCTOBER ISSUE CONTAINS 27 IMPORTANT ARTICLES ON FERRITES: "Resonance Loss Properties of Ferrites in the 9KMC Region" by S. Sensiper, Hughes Aircraft Co. "Magnetic Resonance in Ferrites" by N. Bloembergen, Harvard Univ. "Methods of Preparation and Crystal Chemistry of Ferrites" by Donald Fresh, Bureau of Mines "Topics in Guided Wave Propagation in Magnetized Ferrites" by Morris L. Kales, Naval Research Lab. "Frequency and Loss Characteristics of Microwave Ferrite Devices" by Benjamin Lax, Lincoln Lab., MIT "The Non-Linear Behavior of Ferrites at High Microwave Signal Levels" by H. Suhl, Bell Telephone Laboratories "Dielectric Properties and Conductivity in Ferrites" by L. G. Van Uitert, Bell Telephone Laboratories "The Elements of Non-Reciprocal Microwave Devices" by C. L. Hogan, Harvard Univ. "Fundamental Theory of Ferro and Ferri-Magnetism" by J. H. Van Vleck, Harvard "Ferrites as Microwave Circuit Elements" by G. S. Heller, MIT "Radiation from Ferrite-Filled Apertures" by D. J. Angelakos, Univ. of Calif., Berkeley, Calif. "Anisotropy of Cobalt-Substituted Mn Ferrite Single Crystals" by P. E. Tannenwald and M. H. Seavey, MIT "Birefringence of Ferrites in Circular Waveguide" by N. Karayianis and J. C. Cacheris, Diamond Ordnance Fuze Labs., Washington, D. C. . "Ferrite-Tuned Resonant Cavities" by C. E. Fay, Bell Telephone Laboratories "Ferrite Tunable Microwave Cavities and the Introduction of a New Reflectionless Tunable Microwave Filter" by Conrad E. Nelson, Hughes Aircraft Co. "Permeability Tensor Values from Waveguide Measurements" by E. B. Mullen, G. E., Syracuse "A New Ferrite Isolator" by B. N. Enander, RCA Labs. "Ferrite Directional Couplers" by A. D. Berk and E. Strumwasser, Hughes Aircraft Co. "Intrinsic Tensor Permeabilities on Ferrite Rods, Spheres, and Disks" by E. G. Spencer, L. A. Ault, R. C. LeCraw, Diamond Ordnance Fuze Labs., Washington, D. C. "Magnetic Tuning of Resonant Cavities and Wideband Frequency Modulation of Klystrons" by G. Jones, J. C. Cacheris, C. Morrison, Diamond Ordnance Fuze Labs. "Microwave Resonance Relations in Anisotropic Single Crystal Ferrites" by J. O. Ortman, Harvard Univ. "Anomolous Propagation in Ferrite Loaded Waveguide" by H. Seidel, Bell Telephone Laboratories I PROCEEDINGS OF THE IRE 1 East 79th Street, New York 21, N. Y. □ Enclosed is $3.00 □ Enclosed is company purchase order for the October, 1956 issue on FERRITES. Send to: Name. ® Radio Engineers New York 22, N. Y. Company Address City & State. All IRE members will receive this October issue as usual. Extra copies to members, $1.25 each (only one to a member). STING September 24, 1956 • Page