GB674874A - Improvements in electromagnetic devices - Google Patents

Improvements in electromagnetic devices

Info

Publication number
GB674874A
GB674874A GB3693/49A GB369349A GB674874A GB 674874 A GB674874 A GB 674874A GB 3693/49 A GB3693/49 A GB 3693/49A GB 369349 A GB369349 A GB 369349A GB 674874 A GB674874 A GB 674874A
Authority
GB
United Kingdom
Prior art keywords
field
circuit
curve
magnetic
polarizing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3693/49A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB674874A publication Critical patent/GB674874A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/22—Attenuating devices
    • H01P1/23—Attenuating devices using ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas
    • H03C7/022—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas using ferromagnetic devices, e.g. ferrites
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Amplitude Modulation (AREA)

Abstract

674,874. Magnetic amplifiers. PHILIPS ELECTRICAL, Ltd. Feb. 10, 1949 [Feb. 13, 1948; Oct. 16, 1948], Nos. 3693/49 and 3694/49. Class 40 (iv). [Also in Groups XXXV, XL(b) and XL (c)] A signal is amplified by amplitude (or phase) modulating with it a carrier oscillation which produces after detection the amplified signal in a circuit in which the modulator is an inductance 1 as described with reference to Fig. 1. This has a ferromagnetic core 2 (preferably of ferrite with high permeability and resistance) to which is applied in a direction at right angles to a component of the A.C. field H, a polarizing magnetic field Ho the value of which is constant or varies slowly relative to H and is of an intensity such that the electrons to'which the magnetic properties are due precess about the polarizing field vector with substantially the frequency of the A.C. field. The polarizing field H is produced in a magnetic circuit 6 by a current in winding 5. When coil 1 forms part of a tuned circuit, curve #1f of Fig. 17 shows the relationship between field strength and the amount of detuning suffered by the circuit from the resonant frequency it has when the field value is fr such that the electrons precess in synchronism. Curve #2f shows the losses measured as the half-value width of the tuned circuit characteristic. Amplitude and phase modulation may be obtained by operating on a steeply sloping part of curve #2f whereby the attenuation suffered by the wave as it passes through the core is varied (see Group XL (c)). The invention may take the form not only of a wound inductance but also of a Lecher system, a wave-guide, a coaxial cable, or a cavity resonator.
GB3693/49A 1948-02-13 1949-02-10 Improvements in electromagnetic devices Expired GB674874A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL272407X 1948-02-13
NL161048X 1948-10-16

Publications (1)

Publication Number Publication Date
GB674874A true GB674874A (en) 1952-07-02

Family

ID=26643476

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3693/49A Expired GB674874A (en) 1948-02-13 1949-02-10 Improvements in electromagnetic devices

Country Status (6)

Country Link
BE (1) BE487331A (en)
CH (1) CH272407A (en)
DE (1) DE806150C (en)
FR (1) FR980648A (en)
GB (1) GB674874A (en)
NL (1) NL138838B (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834945A (en) * 1955-04-25 1958-05-13 Bell Telephone Labor Inc Field displacement isolator
US2907964A (en) * 1955-09-22 1959-10-06 Bell Telephone Labor Inc Gyromagnetic polarizing device
US2908878A (en) * 1955-05-27 1959-10-13 Robert F Sullivan Microwave switching device
US2918572A (en) * 1956-05-08 1959-12-22 Decca Record Co Ltd Variable impedance microwave apparatus
US2920292A (en) * 1956-08-30 1960-01-05 Bell Telephone Labor Inc Power saturable wave guide components
US2922129A (en) * 1953-07-08 1960-01-19 Bell Telephone Labor Inc Hall effect device for electromagnetic waves
US2924794A (en) * 1957-12-19 1960-02-09 Bell Telephone Labor Inc Nonreciprocal attenuator
US2941168A (en) * 1954-02-23 1960-06-14 Monogram Prec Ind Inc Unidirectional transmission line
US2944232A (en) * 1953-04-29 1960-07-05 Philips Corp Device comprising a cavity resonator
US2965863A (en) * 1956-06-19 1960-12-20 Bell Telephone Labor Inc Magnetic tuned cavity resonator
US2970274A (en) * 1958-03-21 1961-01-31 Bell Telephone Labor Inc Solid state amplifier
US2972122A (en) * 1958-04-25 1961-02-14 Bell Telephone Labor Inc Nonreciprocal wave transmission
US2989709A (en) * 1955-09-16 1961-06-20 Bell Telephone Labor Inc Magnetically controlled wave guide switch
US2993180A (en) * 1953-12-31 1961-07-18 Bell Telephone Labor Inc Non-reciprocal wave transmission
US2994842A (en) * 1959-02-20 1961-08-01 Polytechnic Inst Brooklyn Coupled-coil wave circulator
US3004153A (en) * 1957-01-04 1961-10-10 Alford Andrew Circuit for use with a plurality of antennas
US3013266A (en) * 1957-04-18 1961-12-12 Westinghouse Electric Corp Beam steering apparatus employing ferrites
US3038133A (en) * 1956-11-09 1962-06-05 Philips Corp Non-reciprocal electric coupling device
US3072869A (en) * 1959-04-29 1963-01-08 Bell Telephone Labor Inc Reciprocal gyromagnetic loss device
US3078425A (en) * 1956-07-12 1963-02-19 Sperry Rand Corp Non-reciprocal tm mode transducer
US3221276A (en) * 1961-04-27 1965-11-30 Gen Electric Microwave variable reactance device operating about a resonant condition
WO2014207453A1 (en) * 2013-06-25 2014-12-31 Bae Systems Plc Non-linear transmission line device

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL92837C (en) * 1951-05-26
US2798207A (en) * 1951-08-17 1957-07-02 Reggia Frank Magnetic microwave attenuators
DE910671C (en) * 1951-09-18 1954-05-06 Oskar Vierling Dr Circuit arrangement for magnetic modulators, modulators, relays, amplifiers, etc.
BE517412A (en) * 1952-02-05
DE949242C (en) * 1952-03-16 1956-09-13 Blaupunkt Werke G M B H Zweign Overlay receiver for frequency-modulated oscillations with automatic focusing
US2784382A (en) * 1952-04-05 1957-03-05 Thompson Prod Inc Magnetic high frequency attenuator
US2832938A (en) * 1952-08-18 1958-04-29 George T Rado Polarization plane rotator for microwave energy
DE977200C (en) * 1953-02-01 1965-06-10 Siemens Ag Gyrator device
US2820951A (en) * 1953-03-17 1958-01-21 Thompson Prod Inc Attenuator
US2951220A (en) * 1953-06-17 1960-08-30 Bell Telephone Labor Inc Wave guide with polarized ferrite element
US3076946A (en) * 1953-06-17 1963-02-05 Bell Telephone Labor Inc Nonreciprocal rectangular wave guide device
US2850701A (en) * 1953-08-07 1958-09-02 Bell Telephone Labor Inc Nonreciprocal wave transmission component
US2980870A (en) * 1954-02-15 1961-04-18 Gen Precision Inc Microwave field rotator
US2954535A (en) * 1954-03-09 1960-09-27 Bell Telephone Labor Inc Non-reciprocal wave transmission
US2922125A (en) * 1954-10-20 1960-01-19 Bell Telephone Labor Inc Nonreciprocal single crystal ferrite devices
BE549727A (en) * 1955-07-22
US2866165A (en) * 1955-08-05 1958-12-23 Gen Precision Lab Inc Microwave duplexer
US2844799A (en) * 1955-09-15 1958-07-22 Bell Telephone Labor Inc Guided wave transmission system
US2951215A (en) * 1956-02-02 1960-08-30 Hughes Aircraft Co Waveguide coupling device with switching arrangement
US3095546A (en) * 1956-03-01 1963-06-25 Sylvania Electric Prod Gyromagnetic isolator using a nonuniform magnetic bias
DE1180847B (en) * 1956-03-28 1964-11-05 Siemens Ag Device for changing the apparent resistance of a capacitor
US2848688A (en) * 1956-04-09 1958-08-19 Gen Precision Lab Inc Microwave switching circuit
NL217093A (en) * 1956-05-12
US2951216A (en) * 1956-12-17 1960-08-30 Hughes Aircraft Co Reflectionless microwave filter
BE563967A (en) * 1957-01-26
NL105047C (en) * 1957-02-15
NL226155A (en) * 1957-05-09
US2979675A (en) * 1957-08-22 1961-04-11 Bell Telephone Labor Inc Non-reciprocal wave transmission
DE1085934B (en) * 1958-01-03 1960-07-28 Hughes Aircraft Co Device for the transmission of electromagnetic waves
DE1055624B (en) * 1958-04-24 1959-04-23 Dr Rer Nat Hans Severin Magnetically changeable? for coaxial lines
NL265707A (en) * 1960-06-09
DE1163927B (en) * 1961-02-13 1964-02-27 Siemens Ag Non-reciprocal gyromagnetic arrangement for devices of the high frequency technology
DE1259422B (en) * 1963-03-14 1968-01-25 Philips Patentverwaltung Reciprocal phase shifter for the transmission of large powers

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944232A (en) * 1953-04-29 1960-07-05 Philips Corp Device comprising a cavity resonator
US2922129A (en) * 1953-07-08 1960-01-19 Bell Telephone Labor Inc Hall effect device for electromagnetic waves
US2993180A (en) * 1953-12-31 1961-07-18 Bell Telephone Labor Inc Non-reciprocal wave transmission
US2941168A (en) * 1954-02-23 1960-06-14 Monogram Prec Ind Inc Unidirectional transmission line
US2834945A (en) * 1955-04-25 1958-05-13 Bell Telephone Labor Inc Field displacement isolator
US2908878A (en) * 1955-05-27 1959-10-13 Robert F Sullivan Microwave switching device
US2989709A (en) * 1955-09-16 1961-06-20 Bell Telephone Labor Inc Magnetically controlled wave guide switch
US2907964A (en) * 1955-09-22 1959-10-06 Bell Telephone Labor Inc Gyromagnetic polarizing device
US2918572A (en) * 1956-05-08 1959-12-22 Decca Record Co Ltd Variable impedance microwave apparatus
US2965863A (en) * 1956-06-19 1960-12-20 Bell Telephone Labor Inc Magnetic tuned cavity resonator
US3078425A (en) * 1956-07-12 1963-02-19 Sperry Rand Corp Non-reciprocal tm mode transducer
US2920292A (en) * 1956-08-30 1960-01-05 Bell Telephone Labor Inc Power saturable wave guide components
US3038133A (en) * 1956-11-09 1962-06-05 Philips Corp Non-reciprocal electric coupling device
US3004153A (en) * 1957-01-04 1961-10-10 Alford Andrew Circuit for use with a plurality of antennas
US3013266A (en) * 1957-04-18 1961-12-12 Westinghouse Electric Corp Beam steering apparatus employing ferrites
US2924794A (en) * 1957-12-19 1960-02-09 Bell Telephone Labor Inc Nonreciprocal attenuator
US2970274A (en) * 1958-03-21 1961-01-31 Bell Telephone Labor Inc Solid state amplifier
US2972122A (en) * 1958-04-25 1961-02-14 Bell Telephone Labor Inc Nonreciprocal wave transmission
US2994842A (en) * 1959-02-20 1961-08-01 Polytechnic Inst Brooklyn Coupled-coil wave circulator
US3072869A (en) * 1959-04-29 1963-01-08 Bell Telephone Labor Inc Reciprocal gyromagnetic loss device
US3221276A (en) * 1961-04-27 1965-11-30 Gen Electric Microwave variable reactance device operating about a resonant condition
WO2014207453A1 (en) * 2013-06-25 2014-12-31 Bae Systems Plc Non-linear transmission line device
US10263565B2 (en) 2013-06-25 2019-04-16 Bae Systems Plc Non-linear transmission line device

Also Published As

Publication number Publication date
FR980648A (en) 1951-05-16
NL138838B (en)
CH272407A (en) 1950-12-15
BE487331A (en)
DE806150C (en) 1951-06-11

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