Ferrite Phase Shifter For The Uhf Region
Download Ferrite Phase Shifter For The Uhf Region full books in PDF, epub, and Kindle. Read online free Ferrite Phase Shifter For The Uhf Region ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
| Author | : C. M. Johnson |
| Publisher | : |
| Total Pages | : 1 |
| Release | : 1959 |
| Genre | : Ferrites (Magnetic materials) |
| ISBN | : |
Ferrite properties which influence phase shifter performance have been investigated, and improved versions of the ferrite-loaded, folded-stripline, UHF phase shifter previously described have been constructed. Some theoretical relations have been derived from conventional ferromagnetic theory to explain the performance of this type of phase shifter, but good quantitative agreement with the experimental results was not attained. This disagreement is attributed to demagnetizing effects. A preliminary investigation has been made to determine the nature of these effects and some of the results are included.
| Author | : C. M. Johnson |
| Publisher | : |
| Total Pages | : 42 |
| Release | : 1958 |
| Genre | : Ferrites (Magnetic materials) |
| ISBN | : |
| Author | : N. G. SAKIOTIS |
| Publisher | : |
| Total Pages | : 1 |
| Release | : 1961 |
| Genre | : |
| ISBN | : |
The exploratory development is described of a slow-wave UHF ferrite phase shifter. The real and imaginary parts of the initial permeability are given for a large percentage of the commercially available ferrites and garnets. The frequency range of the spectra is 400 to 1000 megacycles. From the results of the spectra, the materials are categorized into one or more of five possible low-loss phase shifting regions. The adaptability of periodic coaxial, periodic strip, and helical transmission lines for use in UHF ferrite phase shifters is discussed. In general, it was found that the periodic strip transmission line was best suited for use in a UHF ferrite phase shifter. It is also concluded that, even though considerable gains in the phase shift per unit can be realized with slowvelocity structures, it does not necessarily follow that better phase shifters can be realized through their use. A short discussion on the expected behavior of the absorption loss for variations in ambient temperature is presented and experimental data are given to verify the theory. (Author).
| Author | : WILLIAM D. FITZGERALD |
| Publisher | : |
| Total Pages | : 1 |
| Release | : 1961 |
| Genre | : |
| ISBN | : |
UHF ferrite phase shifters are discussed which are unusually compact and require low drive fields. These devices use a dual-mode network with non-linear phase properties. The non-linear phase-multiplier property of this network enables the design and construction of very compact devices. Their operation is based on domainwall resonance. The material chosen has an internal magnetic field large enough for operation above ferromagnetic resonance, so operation is in the low loss region even for zero, or small, applied control fields. The closed path toroidal geometry implies an efficient magnetic circuit and also contributes to the low field requirements. Two ferrite phase shifters were constructed using the dual-mode network. The first, designed for narrow band operation in the 200 to 350 mc range, is composed of eight dual-mode sections arranged to form a concentric square crosssection. The side dimension of this square is 2-1/8 inches; the length of the phase shifter is 3-1/8 inches. The second device, designed to cover the broader band from 225 to 400 mc, is composed of six dual-mode sections set in a concentric triangular cross-section. This triangle is approximately 2-1/2 inches on a side and the strip-line in this case is approximately 2-1/3 inches long. The first device requires 100 oersteds drive field for 360 degrees differential phase shift while the second device requires 130 oersteds for the same phase shift. (Author).
| Author | : F. P. NIFANT'YEVA |
| Publisher | : |
| Total Pages | : 1 |
| Release | : 1962 |
| Genre | : |
| ISBN | : |
A description is giv n of a uhf phase-shifter which varies the phase of an ou put signal from 0 to 360 degrees by varying the longitudinal magnetic field applied to the ferrite from 0 to 250 oersteds. The phase-shifter is of simple design and has comparatively small dimensions. It consists of a coaxial spiral line with the ferrite inside it. The input and output of the line are made in the form of a 75-ohm coaxial cable plug. Inside the spiral line are two ferritic cores. A two-layer winding of PEL-1 25 wire in a water jacket is wound on the outer cylinder of the coaxial spiral line for the purpose of creating a magnetic field. The line attenuation and the phase shift w re measured at a fr uency of 150 Mc. The characteristics of the phase- ifter are such that w en the gnetic field varies from 0 to 250 oersteds, the phase shift of the signal amounts to 360 degrees, and the attenuation decreases from 12 to 3.2 db. (Author).
| Author | : |
| Publisher | : |
| Total Pages | : 76 |
| Release | : 1960 |
| Genre | : Antenna arrays |
| ISBN | : |
The techniques and devices described and illustrated in this collection have been selected from the inventory of the Electromagnetic Radiation Laboratory as suitable for meeting certain operation and system requirements. The resumes describe actual hardware or proved techniques that have evolved from the ideas of the Laboratory scientists and their contractors working separately and together. They are representative of the tangible products of exploratory studies conducted during the period of 1956 to 1958.
| Author | : L. Thourel |
| Publisher | : Elsevier |
| Total Pages | : 115 |
| Release | : 2016-10-27 |
| Genre | : Technology & Engineering |
| ISBN | : 1483164551 |
The Use of Ferrites at Microwave Frequencies describes the applications of ferrites at microwave frequencies and the apparatus involved. Topics covered range from the properties of ferrites to gyromagnetic and non-reciprocal effects, ferrite isolators, circulators, and modulators. The use of ferrites in variable frequency filter cavities is also discussed. Mathematical explanations are reduced to the strict minimum and only the results of calculations are indicated. This book consists of seven chapters and opens with a review of the theory of magnetism, touching on subjects such as the BOHR magneton, diamagnetism and paramagnetism, ferromagnetism and antiferromagnetism, ferrimagnetism, and demagnetizing. The next chapter deals with the elementary theory of gyromagnetic effects and covers the kinetic moment theorem, precession of the spin moment, gyromagnetic resonance, complex permeability, and gyromagnetic effects in the atom. The reader is then introduced to ferrites and their properties; non-reciprocal effects and their applications; and ferrite isolators, circulators, and modulators. The final chapter describes the use of ferrites in the design of cavities whose resonant frequency is controlled by a magnetic field or filters with variable characteristics. This monograph is written primarily for microwave and electronics engineers.
| Author | : M. COHN |
| Publisher | : |
| Total Pages | : 1 |
| Release | : 1962 |
| Genre | : |
| ISBN | : |
The analysis, construction, and performance of compact surface wave ferroelectric phase shifters suitable for operation in the 100 to 1000 mc frequency range are described. Although this ferroelectric loaded parallel plane structure is a very low impedance structure, a satisfactory terminal impedance matching technique has been devised, Kilovolt level voltages are needed; but since the current required to maintain or rapidly shift phase is low, the over-all control power requirements are at least an order of magnitude less than those for comparable ferrite phase shifters. One of these room temperature operable phase shifters provided 348 degrees of phase shift and had an insertion loss which varied from 3.7 to 2.2 db at 207 mc and over a zero to 4000 volt range of applied dc control voltage. (Author).
| Author | : Arthur J. Estin |
| Publisher | : |
| Total Pages | : 472 |
| Release | : 1970 |
| Genre | : Electricity |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 460 |
| Release | : 1970 |
| Genre | : Weights and measures |
| ISBN | : |
