By Topic

# Proceedings of the IEE - Part B: Radio and Electronic Engineering

## Filter Results

Displaying Results 1 - 25 of 27
• ### A survey of the theory and applications of ferrites at microwave frequencies

Publication Year: 1957, Page(s):267 - 282
Cited by:  Papers (1)
| | PDF (2361 KB)

The paper opens with a brief review of gyromagnetic media in general, followed by a more detailed description of the microwave behaviour of a ferromagnetic medium, of which ferrites form a suitable class of material. The general physical properties of ferrites are outlined briefly, together with a description of several of the mechanisms to account for the dispersion which occurs in their r.f. per... View full abstract»

• ### Discussion at the Microwave Introductory Session at the Convention on Ferrites, 1st November, 1956

Publication Year: 1957, Page(s):283 - 285
| PDF (389 KB)
• ### The authors' reply to the discussion at the Microwave Introductory Session

Publication Year: 1957
| PDF (60 KB)
• ### Some properties of circular waveguides containing ferrites

Publication Year: 1957, Page(s):286 - 295
Cited by:  Papers (2)
| | PDF (1295 KB)

The paper describes some results of an experimental investigation of the propagation behaviour of circular waveguides containing longitudinally magnetized ferrite rods. Measurements have been made at 9.250kMc/s using nickelÂ¿zinc ferrite. Reasonable correlation is obtained between experimental and theoretical results for the limiting cases of the thin ferrite rod and the waveguide completely fille... View full abstract»

• ### The measurement of complex permittivity and complex tensor permeability of ferrite materials at microwave frequencies

Publication Year: 1957, Page(s):296 - 306
| | PDF (1483 KB)

A review is given of the techniques available for measuring the properties of ferrite materials at microwave frequencies. A detailed account is given of permeability and permittivity measurements in the 3 cm band using a cavity technique. The input impedance of an H11-mode cavity loaded with a ferrite disc or sphere is derived by a perturbation calculation. The equivalence between this impedance a... View full abstract»

• ### Theory of the measurement of the elements of the permeability tensor of a ferrite by means of a resonant cavity

Publication Year: 1957, Page(s):307 - 315
Cited by:  Papers (2)
| | PDF (1150 KB)

The intrinsicÂ¿ and externalÂ¿ permeabilities of a ferrite are defined, and the relationship between the elements of these tensors is discussed. The derivation from Maxwell's equations is given of the magnetic field in a ferrite sphere when this is placed in a uniform microwave field perpendicular to the polarizing field. This result is used in the calculation of the frequency shift which takes ... View full abstract»

• ### Non-reciprocal network theory applied to ferrite microwave devices

Publication Year: 1957, Page(s):316 - 319
Cited by:  Papers (1)
| | PDF (333 KB)

First Page of the Article
View full abstract»

• ### Discussion on "Microwave theory and measurements" at the Convention on Ferrites, 1st November, 1956

Publication Year: 1957, Page(s):320 - 322
| PDF (423 KB)
• ### The authors' replies to the discussion on "Microwave theory and measurements"

Publication Year: 1957, Page(s):322 - 323
| PDF (271 KB)
• ### Microwave Faraday effect and conductivity in nickel ferrites and ferrite-aluminates

Publication Year: 1957, Page(s):324 - 330
Cited by:  Papers (1)
| | PDF (847 KB)

Nickel ferrite was prepared from pure ferric and nickel oxides by firing at temperatures between 1090 and 1350Â°C. The influence of the firing temperature on the Faraday effect at 3cm wavelength was studied. Results are reported for nickel ferrites with excess and deficiency of iron oxide, and for nickel ferrite-aluminates. It is shown that low loss combined with high rotation may be obtained by u... View full abstract»

• ### Some properties and applications of ferrites at 3 cm wavelength

Publication Year: 1957, Page(s):331 - 337
Cited by:  Papers (2)
| | PDF (864 KB)

The effect of temperature on some of the properties of ferrites in WG16 rectangular waveguide has been studied between 20 and 300Â°C. The properties investigated were the zero-field loss, the absorption at ferromagnetic resonance and the external applied magnetic field required for ferromagnetic resonance. For thin samples the variation of the properties can be explained, at least qualitatively, o... View full abstract»

• ### Measurement of ferrite properties in a rectangular cavity at 10,000 Mc/s

Publication Year: 1957, Page(s):338 - 341
| | PDF (504 KB)

Two methods for the determination of tensor susceptibility components of ferrites, based on an exact solution of the field equations in contrast to the existing perturbation technique, have been developed. They have the advantage of enabling a larger amount of material to be introduced in the cavity, thereby producing a more accurate measurement of the properties of very low-loss ferrites. Also a ... View full abstract»

• ### The quantum theory of spontaneous magnetization of ferrites at low temperatures

Publication Year: 1957
| | PDF (135 KB)

First Page of the Article
View full abstract»

• ### Discussion on "Microwave measurements and properties" at the Convention on Ferrites, 1st November, 1956

Publication Year: 1957, Page(s):343 - 345
| PDF (416 KB)
• ### The authors' replies to the discussion on "Microwave measurements and properties"

Publication Year: 1957
| PDF (178 KB)
• ### Ferrite structures for millimetre wavelengths

Publication Year: 1957, Page(s):346 - 354
Cited by:  Papers (2)
| | PDF (1305 KB)

The paper gives the results of the extension to higher frequencies than heretofore of work already performed on ferrites and outlines the applications to which these results pertain. The dispersion and absorption occurring in ferrite materials in the presence of an applied magnetic field is briefly mentioned. A description is then given of measurements on typical ferrites with both longitudinal an... View full abstract»

• ### Applications of ferrites at 3 cm wavelength

Publication Year: 1957, Page(s):355 - 361
Cited by:  Papers (1)
| | PDF (841 KB)

A consideration of the desirable properties in ferrites for microwave purposes is followed by an examination of some ferrites normally used at low frequencies to assess their suitability at 3cm wavelength. The transverse-field and Faraday-rotation effects are then discussed, and work resulting in the design of practical medium-power isolators and circulators for 3Â¿cm wavelength utilizing standard... View full abstract»

• ### Development of a rotation isolator for 6 cm wavelength

Publication Year: 1957, Page(s):362 - 363
| | PDF (312 KB)

Constructional data on an isolator using Faraday rotation in a circular waveguide are given. The use of a reactive element for matching of the ferrite makes the use of a tapered rod unnecessary for this purpose, although short tapers are retained in order to get a more homogenous magnetization. Performance data for the device are given for frequencies between 4400 and 5000 Mc/s. View full abstract»

• ### A resonance absorption isolator in microstrip for 4 Gc/s

Publication Year: 1957, Page(s):364 - 365
Cited by:  Papers (1)
| | PDF (162 KB)

First Page of the Article
View full abstract»

• ### Discussion on "Microwave apparatus"I-at the Convention on Ferrites, 2nd November, 1956

Publication Year: 1957, Page(s):366 - 369
| PDF (639 KB)
• ### The authors' replies to the discussion on "Microwave apparatus-I"

Publication Year: 1957, Page(s):369 - 370
| PDF (258 KB)
• ### Notes on microwave ferromagnetics research

Publication Year: 1957, Page(s):371 - 378
Cited by:  Papers (3)
| | PDF (1244 KB)

The paper is a report on several of the research projects undertaken in the Radio Research Department of the Bell Laboratories. Ceramic Ferroxdure has been studied at 9, 24 and 48kMc/s, and it has been established that the strong absorption at 48kMc/s is due to resonance caused by a crystalline-anisotropy field of 18000 oersteds. This material has been used as a filter, as the active element in mi... View full abstract»

• ### Some measurements and applications of the microwave properties of a magnesium-manganese ferrite in the 8ߝ9 mm waveband

Publication Year: 1957, Page(s):379 - 382
| | PDF (383 KB)

An investigation has been made of the effect of an axial magnetic field on the microwave properties of a magnesium¿¿manganese ferrite in the 8ߝ9 mm waveband. Using cylindrical ferrite samples in circular guide propagating plane polarization, measurements were made of the insertion loss, reflection coefficients, Faraday rotation and ellipticity produced by the ferrite. On the basis of these m... View full abstract»

• ### The 45Â° Faraday-rotation ferrite isolator

Publication Year: 1957, Page(s):383 - 387
| | PDF (692 KB)

The wave propagation in a dielectric rod is used to explain the behaviour of ferrite rods in 45Â° Faraday-rotation isolators. The influence of the diameter of the rod and of variations in wavelength upon the Faraday rotation are considered. View full abstract»

• ### Some applications of ferrites to microwave directional couplers, switches, and cavity filters

Publication Year: 1957, Page(s):388 - 394
| | PDF (963 KB)

The paper reviews some of the research and development projects which led to the designs for a ferrite directional coupler, a ferrite microwave switch and ferrite-loaded cavity filters. Directional coupling is accomplished at microwave frequencies by extending a ferrite cylinder through the common wall of two rectangular waveguides joined at the broad face. Experimental data for coupling and direc... View full abstract»