US3038133A - Non-reciprocal electric coupling device - Google Patents

Non-reciprocal electric coupling device Download PDF

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Publication number
US3038133A
US3038133A US690384A US69038457A US3038133A US 3038133 A US3038133 A US 3038133A US 690384 A US690384 A US 690384A US 69038457 A US69038457 A US 69038457A US 3038133 A US3038133 A US 3038133A
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United States
Prior art keywords
frequency
coupling device
electric coupling
core
reciprocal electric
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Expired - Lifetime
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US690384A
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English (en)
Inventor
Vries Gerrit De
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3038133A publication Critical patent/US3038133A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/002—Gyrators

Definitions

  • This invention relates to non-reciprocal electric coupling devices, in which the transmission of energy in one direction is nil.
  • Such devices are used, for example, as a microwave insulator, for example in a connection between a generator and a load in order to suppress the reaction of the load upon the generator.
  • a plurality of devices of this kind are already known in which a piece of pre-polarized high-frequency magnetic material, for example of ferrite, is arranged at a given area in a wave guide so that waves in the wave guide are passed substantially unhindered in one direction and materially damped in the other direction.
  • a piece of pre-polarized high-frequency magnetic material for example of ferrite
  • Such devices are not usable for comparatively low frequencies, for example of the order of 500 mc./s., since the dimensions of the wave guide would become too large for practical use.
  • a non-reciprocal electric coupling device which comprises two crossing coils having their winding surfaces arranged at right angles to each other and surrounding a common core of high-frequency magnetic material which is pre-polarized in a direction parallel to the intersecting line of the winding surfaces.
  • Such a coupling device is indicated in certain cases by the name of gyrator.
  • transmission of energy from one coil to the other may be eliminated by means of an external resistance coupling between the two coils.
  • transmission of energy can take place.
  • This device is not particularly suitable for waves having a wavelength of the order of 50 cms.
  • the non-reciprocal electric coupling device likewise comprises two crossing windings surrounding a common core of high-frequency magnetic material which is pro-polarized in a direction parallel to the intersecting line of the winding surfaces.
  • the winding surfaces are at an angle between and 90 and the prepolarization has a value such that for a given frequency the transmission coeificient between the windings is nil. This device thus has no external coupling between the windings.
  • the windings may each comprise a single turn.
  • FIG. 1 shows two crossing Lecher lines 1 and 2, which are each short-circuited at one end to form a single turn and which surround a core 3 of high-frequency magnetic material.
  • the planes in which the conductors of the Lecher lines 1 and 2 are situated are at an angle of (p to each other.
  • the core is pro-polarized in a direction parallel to the intersecting line of said planes, as indicated by arrow H, by means (not shown), for example an electromagnet.
  • an angle (p between 0 and 90 corresponds to a field strength H, with which at a given frequency there is no transmission of energy from coil 1 to coil 2, but such transmission is possible in the reverse direction.
  • FIG. 2 shows the relationship between the coupling factor S between the coils 1 and 2 and the frequency f for different values H H H and H; of the pre-polarizing field. From the figure it may be seen that the coupling factor S corresponding to the field strength H becomes nil for a frequency of 250 mc./s.
  • 0 indicates the angular frequency, co the angular frequency at which for the given value of the prepolarizing field H magnetic resonance of the high-frequency material occurs, and w the angular frequency at which the magnetic material is in anti-resonance, that is to say at which the real part of the permeability ,u which indicates the relationship between a component of the mag netic inductance in a direction at right angles to the prepolarization and the component of the magnetic field in the same direction, is nil.
  • ,8 indicates a magnitude which is proportional to the magnetic losses of the material, and j is equal to the root of 1.
  • a non-reciprocal electrical coupling device comprising a core of high-frequency magnetic material, a first winding positioned to surround said core and lying substantially in a first plane, a second winding positioned to surround said core and lying substantially in a second plane, said windings being oriented with respect to each other so that said first and second planes intersect each other at an angle lying between the values of zero and ninety degrees, and means for pre-polarizing said core in a direction parallel to the line of intersection of said first and second planes, said pre-polarization having a value to cause said core material to be substantially in magnetic anti-resonance at a predetermined frequency whereby the signal transmission coefiicient between said windings is substantially zero in one direction at said frequency determined by the value of said pre-polarization.

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  • Coils Or Transformers For Communication (AREA)
US690384A 1956-11-09 1957-10-15 Non-reciprocal electric coupling device Expired - Lifetime US3038133A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL863866X 1956-11-09

Publications (1)

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US3038133A true US3038133A (en) 1962-06-05

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US690384A Expired - Lifetime US3038133A (en) 1956-11-09 1957-10-15 Non-reciprocal electric coupling device

Country Status (5)

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US (1) US3038133A (nl)
DE (1) DE1050408B (nl)
FR (1) FR1185887A (nl)
GB (1) GB863866A (nl)
NL (2) NL212081A (nl)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286201A (en) * 1966-04-29 1966-11-15 Melabs Ferrite circulator having three mutually coupled coils coupled to the ferrite material
US3310759A (en) * 1963-05-09 1967-03-21 Nippon Electric Co High frequency circulator comprising a plurality of non-reciprocal ferromagnetic circuits
US3334318A (en) * 1964-12-05 1967-08-01 Mitsubishi Electric Corp Stripline circulator having means causing electrostatic capacitance between adjacent pairs of terminals to be substantially equal to each other
US3531747A (en) * 1969-03-07 1970-09-29 Melabs Tunable inductor
US4210886A (en) * 1978-09-18 1980-07-01 Motorola, Inc. Isolator having reactive neutralizing means and predetermined angle between input-output windings
EP1246292A3 (en) * 2001-03-30 2003-12-10 Hitachi Metals, Ltd. Two-port isolator and method for evaluating it

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2131627B (en) * 1982-12-03 1987-08-26 Raytheon Co A magnetically tuned resonant circuit

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561489A (en) * 1946-12-23 1951-07-24 Bloch Felix Method and means for chemical analysis by nuclear inductions
US2589494A (en) * 1948-07-20 1952-03-18 Rca Corp Stabilizing method and system utilizing nuclear precession
GB674874A (en) * 1948-02-13 1952-07-02 Philips Nv Improvements in electromagnetic devices
GB716257A (en) * 1950-09-28 1954-09-29 Philips Electrical Ind Ltd Improvements in or relating to electric impedance networks
US2755447A (en) * 1954-10-29 1956-07-17 Itt Radio frequency coupling devices
US2757359A (en) * 1954-12-30 1956-07-31 Ibm Spin echo storage systems
US2798205A (en) * 1952-05-28 1957-07-02 Bell Telephone Labor Inc Magnetically controllable transmission system
US2834943A (en) * 1953-09-16 1958-05-13 Bell Telephone Labor Inc Mechanically coupled electromechanical and magnetomechanical transducers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561489A (en) * 1946-12-23 1951-07-24 Bloch Felix Method and means for chemical analysis by nuclear inductions
GB674874A (en) * 1948-02-13 1952-07-02 Philips Nv Improvements in electromagnetic devices
US2589494A (en) * 1948-07-20 1952-03-18 Rca Corp Stabilizing method and system utilizing nuclear precession
GB716257A (en) * 1950-09-28 1954-09-29 Philips Electrical Ind Ltd Improvements in or relating to electric impedance networks
US2798205A (en) * 1952-05-28 1957-07-02 Bell Telephone Labor Inc Magnetically controllable transmission system
US2834943A (en) * 1953-09-16 1958-05-13 Bell Telephone Labor Inc Mechanically coupled electromechanical and magnetomechanical transducers
US2755447A (en) * 1954-10-29 1956-07-17 Itt Radio frequency coupling devices
US2757359A (en) * 1954-12-30 1956-07-31 Ibm Spin echo storage systems

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310759A (en) * 1963-05-09 1967-03-21 Nippon Electric Co High frequency circulator comprising a plurality of non-reciprocal ferromagnetic circuits
US3334318A (en) * 1964-12-05 1967-08-01 Mitsubishi Electric Corp Stripline circulator having means causing electrostatic capacitance between adjacent pairs of terminals to be substantially equal to each other
US3286201A (en) * 1966-04-29 1966-11-15 Melabs Ferrite circulator having three mutually coupled coils coupled to the ferrite material
US3531747A (en) * 1969-03-07 1970-09-29 Melabs Tunable inductor
US4210886A (en) * 1978-09-18 1980-07-01 Motorola, Inc. Isolator having reactive neutralizing means and predetermined angle between input-output windings
EP1246292A3 (en) * 2001-03-30 2003-12-10 Hitachi Metals, Ltd. Two-port isolator and method for evaluating it
US6940360B2 (en) 2001-03-30 2005-09-06 Hitchi Metals, Ltd. Two-port isolator and method for evaluating it
KR100862962B1 (ko) * 2001-03-30 2008-10-13 히타치 긴조쿠 가부시키가이샤 2단자쌍 절연장치 및 그 평가 방법

Also Published As

Publication number Publication date
GB863866A (en) 1961-03-29
FR1185887A (fr) 1959-08-07
NL212081A (nl)
DE1050408B (nl)
NL94713C (nl)

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