US3246262A - Heat sink for a ferrite material employing metal oxides as the dielectric material - Google Patents

Heat sink for a ferrite material employing metal oxides as the dielectric material Download PDF

Info

Publication number
US3246262A
US3246262A US282292A US28229263A US3246262A US 3246262 A US3246262 A US 3246262A US 282292 A US282292 A US 282292A US 28229263 A US28229263 A US 28229263A US 3246262 A US3246262 A US 3246262A
Authority
US
United States
Prior art keywords
ferrite
heat
dielectric material
conductor
cross
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 - Lifetime
Application number
US282292A
Inventor
Wichert Hans Walter
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Application granted granted Critical
Publication of US3246262A publication Critical patent/US3246262A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/24—Terminating devices
    • H01P1/26—Dissipative terminations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices
    • H01P1/38—Circulators
    • H01P1/383—Junction circulators, e.g. Y-circulators
    • H01P1/39—Hollow waveguide circulators

Definitions

  • the present invention relates generally .to ferrite devices and, more particularly, to a broadband arrangement for conducting heat away from a pro-magnetized microwave ferrite, wherein the ferrite is not in direct heat-conducting contact or relationship with the Wall of a surrounding hollow conductor.
  • Another object of the invention is to provide an arrangement for removing heat from ferrites which is simple and inexpensive.
  • the dielectric material can, for example, be the oxides of beryllium, aluminum or magnesium inasmuch as these materials, in addition to having a low dieiectric loss in a microwave region, are very good conductors of heat and have a thermal conductivity which is approximately in the same order of magnitude as the thermal conductivity of the corresponding metals.
  • the dielectric materials at the same time serve for holding or positioning the ferrite part within the hollow conductor and maintain the ferrite element at a predetermined spaced distance from the wall of the hollow conductor.
  • the dielectric material may conduct the heat which is produced to the cooler hollow conductor as quickly as possible, it is expedient that the dielectric material touch the ferrite on two opposite surfaces and itself be in contact with the wall of the hollow conductor over as large a contact surface as possible. It is also possible to surround the ferrite elment on all sides with this dielectric material which itself is in engagement with the respective hollow conductor wall. According to a further feature of the present invention the ferrite can be equipped with at least one bore in which there is a core of the above-mentioned dielectric material, this core being connected to the hollow conductor of the arrange ment.
  • FIGURE 1 is a cross-sectional View through a first embodiment of the present invention with a rectangular wave guide.
  • FIGURE 2 is a cross-sectional view through a second embodiment wherein the elements are circular in cross section.
  • FIGURE 3 is a cross-sectional view of a modification of the embodiment of FIGURE 2.
  • FIGURE 4 is a cross-sectional view of a third embodiment for a Y-circulator.
  • FIGURE 5 is a cross-sectional view of a modification of the embodiment of FIGURE 4.
  • FIGURE 6 is a cross-sectional view of a fourth embodiment wherein a plurality of ferrite bodies are used.
  • FIGURE 7 is a cross-sectional view of a modification of the embodiment of FIGURE 6.
  • FIG- URE 1 illustrates a rectangular hollow conductor 1 in which a ferrite 2 is arranged.
  • a piece of dielectric material 3 is provided which, for example, is made of beryllium oxide and is arranged between the ferrite and the hollow conductor.
  • the ferrite body 22 may have a bore 20 in which a core made of the dielectric material 23 which is a good conductor of heat my be disposed. This material 23 is in good surface-to-surface contact with the wall of the hollow conductor.
  • FIGURE 3 Another form of the invention is shown in FIGURE 3.
  • a pre-magnetized hollow ferrite 32 Arranged within the hollow conductor branching (not shown) is a pre-magnetized hollow ferrite 32 having a bore 30.
  • the space between the ferrite and the hollow conductor wall is, in this embodiment, at least partially occupied by the dielectric material 34.
  • the ferrite bore 30 contains dielectric material 33.
  • the present invention can be used to advantage in Y- circulators, which, in the microwave region, are made up of hollow conductors and possess a pre-magnetized ferrite.
  • Y- circulators which, in the microwave region, are made up of hollow conductors and possess a pre-magnetized ferrite.
  • the ferrite In order to obtain a large bandwidth for such a circulator, it has already been suggested to provide the ferrite with a cross section which is approximately the shape of a three-leaf clover. With this arrangement, too,
  • FIGURE 4 shows such a Y circulator having a suitably cross-sectioned fern'te'42, which is surrounded on all sides by the dielectric material 43 so that the crosssectional configuration of the arrangement is a triangle.
  • FIGURE 5 In lieu of the cross-sectional configuration of the ferrite shown in FIGURE 4, which is difiicult in practice to produce, the arrangement can be made as shown in FIGURE 5.
  • a ferrite body 52 which has a triangular cross section and a-central longitudinal bore 50 is used.
  • the core 53 of dielectric material of good conducting characteristics is inserted into bore 50.
  • FIGURE -6 shows a further embodiment of the present invention in which three cylindrical ferrite bodies 62 are positioned together in sucha manner that they mutually'touch each other.
  • the hollow space which remains in the center between the three ferrite cylinders is, for purposes of draining oifthe deleterious heat losses,
  • FIGURE 7 shows an embodiment of the invention in which the longitudinal bore-70 of the ferrite body' 72
  • FIGURE 5 has a triangular cross section.
  • the bore is filled with the dielectriccore 73 which is in good surface-to-surface contact with the wall ofthe hollow conductor of the Y-circular. If a good deal of heat hasto be drainedoff, it is further possible to provide additional dielectric material between one or moreconduction of. the heat losses, andalso the retention of the usual electrical characteristics, a substantially greater bandwidth,1about 40%, than was the case in heretofore known Y-circulat-ors. The reason for this might be that,
  • the invention can be carried further by building up the ferrite bodyof individual'ferrite' layers,*between which there are arranged suitably'configured discs made of the dielectric material which is a good conductor of heat.
  • the improvement comprising a dielectric material which is a good conductor of heat interposed between the ferrite and the hollow conductor, the dielectric material surrounding the ferrite on all sides, and the dielectric material being one selected from the group'consisting of beryllium oxide, aluminum oxide, and magnesium oxide.
  • the improvement in aubroadband arrangement for removing heat in a pre-magnetized microwave'ferrite in aholl-ow'conductor butwhich is not in direct and heat exchange contact with the wall of the conductor, the improvement'com-prising a dielectric materialwhich is a good conductor of heat interposed between the'ferrite'and the hollow conductor, and a plurality of ferritesbeing'used and defining an opening which is filled with the dielectric material.

Landscapes

  • Non-Reversible Transmitting Devices (AREA)

Description

Aprll 12, 1966 H. w. WICHERT 3,245,262
HEAT SINK FOR A FERRITE MATERIAL EMPLOYING METAL OXIDES AS THE DIELECTRIC MATERIAL Flled May 22, 1963 2 Sheets-Sheet l yaw/0110111011 llllllll/l/II/M INVENTOR Hans Walter Wichert ATTORNEYS Apnl 12, 1966 H. w. WICHERT 3,246,262
HEAT SINK FOR A FERRITE MA RIAL EMPLOYING METAL OXIDES AS THE DIELE I0 MATERIAL 2 Sheets-Sheet 2 Filed May 22, 1963 FIG.6.
PIC-3.5.
WAVEGUIDE FOR Y-CIRCULATOR INVENTOR Hans Walter Wichert ATTORNEYS United States Patent 8 Claims. 61. ass-1.1
The present invention relates generally .to ferrite devices and, more particularly, to a broadband arrangement for conducting heat away from a pro-magnetized microwave ferrite, wherein the ferrite is not in direct heat-conducting contact or relationship with the Wall of a surrounding hollow conductor.
It has been found that considerable difiiculties are encountered when heat is to be removed from ferrite elements or structural pieces in the microwave art if the power is greater than approximately one kilowatt. In known arrangements of this type, the heat is generally given off to the cooler surroundings by means of convection. In the case of large heat losses, however, this is possible only to a very limited extent. In order that the heat which'is produced nevertheless be carried off, the shape and arrangement of the ferrite, in such microwave structures up to now, has been so selected that the heat which is produced is carried off by means of direct heat contact with the metallic conductor. This, however, means that at the same time the optimal electrical dimensioning of the ferrite structure must be sacrificed. In ferrite arrangements in which, due to special electrical characteristics, there may not be any direct contact with the metallic hollow conductor, it is therefore not possible, when the device is operating at high power, to drain the heat off the ferrite, i.e., it is difficult to remove the heat which is produced.
There also exists an arrangement in which a liquid coolant surrounds the ferrite body and is used for draining off the heat losses of the ferrite. The dielectric coolant is continuously circulated by a pump system. However, the expenses of such an arrangement are inherently very high.
With these defects of the prior art in mind, it is a main object of the present invention to provide a broadband arrangement which overcomes the above drawbacks without adversely affecting the electrical characteristics of the microwave arrangement.
Another object of the invention is to provide an arrangement for removing heat from ferrites which is simple and inexpensive.
These objects and others ancillary thereto are accomplished according to preferred embodiments of the present invention wherein an arrangement for draining the heat off a pre-magnetized microwave ferrite is provided. In this arrangement there is direct heat exchange contact with the wall of the hollow conductor. Between the ferrite and the hollow conductor a dielectric is arranged which itself is a good conductor of heat.
The interposition of a suitable dielectric between the ferrite and the hollow conductor has but little influence on the electrical characteristics of such a microwave structure, While there is a substantial improvement in the removal of the heat losses of the ferrite, i.e., the dielectric which itself is a good conductor of heat will substantially improve the way in which the heat losses are given off to the cooler surroundings of the hollow conductor.
The dielectric material can, for example, be the oxides of beryllium, aluminum or magnesium inasmuch as these materials, in addition to having a low dieiectric loss in a microwave region, are very good conductors of heat and have a thermal conductivity which is approximately in the same order of magnitude as the thermal conductivity of the corresponding metals. The dielectric materials at the same time serve for holding or positioning the ferrite part within the hollow conductor and maintain the ferrite element at a predetermined spaced distance from the wall of the hollow conductor.
In order that the dielectric material may conduct the heat which is produced to the cooler hollow conductor as quickly as possible, it is expedient that the dielectric material touch the ferrite on two opposite surfaces and itself be in contact with the wall of the hollow conductor over as large a contact surface as possible. It is also possible to surround the ferrite elment on all sides with this dielectric material which itself is in engagement with the respective hollow conductor wall. According to a further feature of the present invention the ferrite can be equipped with at least one bore in which there is a core of the above-mentioned dielectric material, this core being connected to the hollow conductor of the arrange ment.
Additional objects and advantages of the present invention will become apparent upon consideration of the following description when taken in conjunction with the accompanying drawings in which:
FIGURE 1 is a cross-sectional View through a first embodiment of the present invention with a rectangular wave guide.
FIGURE 2 is a cross-sectional view through a second embodiment wherein the elements are circular in cross section.
FIGURE 3 is a cross-sectional view of a modification of the embodiment of FIGURE 2.
FIGURE 4 is a cross-sectional view of a third embodiment for a Y-circulator.
FIGURE 5 is a cross-sectional view of a modification of the embodiment of FIGURE 4.
FIGURE 6 is a cross-sectional view of a fourth embodiment wherein a plurality of ferrite bodies are used.
FIGURE 7 is a cross-sectional view of a modification of the embodiment of FIGURE 6.
With more particular reference to the drawings, FIG- URE 1 illustrates a rectangular hollow conductor 1 in which a ferrite 2 is arranged. In order to remove the heat produced in the ferrite and for simultaneously holding or mounting the ferrite, by sticking a piece of dielectric material 3 is provided which, for example, is made of beryllium oxide and is arranged between the ferrite and the hollow conductor.
As shown in FIGURE 2, in order to drain off the deleterious heat loss present in the ferrite and to bring this heat loss to the cooler surroundings, the ferrite body 22 may have a bore 20 in which a core made of the dielectric material 23 which is a good conductor of heat my be disposed. This material 23 is in good surface-to-surface contact with the wall of the hollow conductor.
Another form of the invention is shown in FIGURE 3. Arranged within the hollow conductor branching (not shown) is a pre-magnetized hollow ferrite 32 having a bore 30. The space between the ferrite and the hollow conductor wall is, in this embodiment, at least partially occupied by the dielectric material 34. The ferrite bore 30 contains dielectric material 33.
The present invention can be used to advantage in Y- circulators, which, in the microwave region, are made up of hollow conductors and possess a pre-magnetized ferrite. In order to obtain a large bandwidth for such a circulator, it has already been suggested to provide the ferrite with a cross section which is approximately the shape of a three-leaf clover. With this arrangement, too,
it is possible to use the above-described dielectric material for draining off the heat so that such Y-circulators can be used in connection with substantially greater power.
FIGURE 4 shows such a Y circulator having a suitably cross-sectioned fern'te'42, which is surrounded on all sides by the dielectric material 43 so that the crosssectional configuration of the arrangement is a triangle.
In lieu of the cross-sectional configuration of the ferrite shown in FIGURE 4, which is difiicult in practice to produce, the arrangement can be made as shown in FIGURE 5. Here a ferrite body 52 which has a triangular cross section and a-central longitudinal bore 50 is used. The core 53 of dielectric material of good conducting characteristics is inserted into bore 50.
7 FIGURE -6 shows a further embodiment of the present invention in which three cylindrical ferrite bodies 62 are positioned together in sucha manner that they mutually'touch each other. The hollow space which remains in the center between the three ferrite cylinders is, for purposes of draining oifthe deleterious heat losses,
' filled with a suitably configured dielectric material 63.
FIGURE 7 shows an embodiment of the invention in which the longitudinal bore-70 of the ferrite body' 72,
shown in FIGURE 5, has a triangular cross section.
Again, the bore is filled with the dielectriccore 73 which is in good surface-to-surface contact with the wall ofthe hollow conductor of the Y-circular. If a good deal of heat hasto be drainedoff, it is further possible to provide additional dielectric material between one or moreconduction of. the heat losses, andalso the retention of the usual electrical characteristics, a substantially greater bandwidth,1about 40%, than was the case in heretofore known Y-circulat-ors. The reason for this might be that,
Ldue .to the central bore in the ferrite, the disturbing inherent'resonances' are shifted out of'the operating region.
'Intorder'that the above-described ferrite arrangements be as independent of temperature fluctuations as possible, the invention can be carried further by building up the ferrite bodyof individual'ferrite' layers,*between which there are arranged suitably'configured discs made of the dielectric material which is a good conductor of heat.
It will be understood that the above description of the present inventionis susceptible to variousmodifications, changes, and adaptations, and thesame are intended to be comprehended within the meaning and range of equivalents of the appended claims.
What is claimed is: 1. In a broadband arrangement for removing heat in a pre-magnetized microwave ferrite in a hollow conduc tor but which is not indirect and heat exchange contact with the wall of the conductor, the improvement comprising a dielectric material which is a good conductor of heat interposed between the ferrite and the hollow conductor, the dielectric material surrounding the ferrite on all sides, and the dielectric material being one selected from the group'consisting of beryllium oxide, aluminum oxide, and magnesium oxide.
2. The improvement as defined in claim 1 wherein the ferrite has at least one opening defined-therethrough which is filled with the dielectric material.
3. The improvement as defined in claim 2 wherein the ferrite is used for a Y-circulator and is triangular in cross section,.said opening extending longitudinally through the ferrite and being triangular in cross section.
4. The improvement as defined in claim 2 wherein the cross sections of the dielectric material and theferrite are circular.
5. The improvement as defined in claim 2 wherein the ferrite is clover shaped in cross section.
6. In aubroadband arrangement for removing heat in a pre-magnetized microwave'ferrite in aholl-ow'conductor butwhich is not in direct and heat exchange contact with the wall of the conductor, the improvement'com-prising a dielectric materialwhich is a good conductor of heat interposed between the'ferrite'and the hollow conductor, and a plurality of ferritesbeing'used and defining an opening which is filled with the dielectric material.
7. The improvement as defined in claim 6'wherein the ferrites are circular in cross section.
8. In a broadband arrangement forremoving'heat' in a pre-rnagnetized microwave ferrite in a'hollow conductor but which is 'notindirect and "heat-exchange contact with the wall of the-conductor, the improvement compris ing a dielectric materal 'whch is a good conductor of heat interposed between the ferrite and thehollow'con- -ductor, said ferrite 'being'used for a -Y-circulator and 1 being triangular in cross==sec'tion, said'ferrite having at least one opening defined 'therethrough which extends longitudinally through the ferrite and is triangular in cross section and "which-is filled with the dielectric Chait et al.: New Micr'owave Circulators, Electronics,
Dec. 18, l959, pages 81-83 relied upon.
Lax et al.: Microwave Ferrites and Ferrimagnetics, Lincoln Lab. Publication, McGraw-Hill, received'Sci. Library, Jan. 7, 1962, pages 620-623 relied on.
HERMAN KARL SAALBACH, Primary Examiner, ELI LIEBERMAN, Examiner,

Claims (1)

1. IN A BROADBAND ARRANGEMENT FOR REMOVING HEAT IN A PRE-MAGNETIZED MICROWAVE FERRITE IN A HOLLOW CONDUCTOR BUT WHICH IS NOT IN DIRECT AND HEAT EXCHANGE CONTACT WITH THE WALL OF THE CONDUCTOR, THE IMPROVEMENT COMPRISING A DIELECTRIC MATERIAL WHICH IS A GOOD CONDUCTOR OF HEAT INTERPOSED BETWEEN THE FERRITE AND THE HOLLOW CONDUCTOR, THE DIELECTRIC MATERIAL SURROUNDING THE FERRITE ON ALL SIDES, AND THE DIELECTRIC MATERIAL BEING ONE SELECTED FROM THE GROUP CONSISTING OF BERYLLIUM OXIDE, ALUMINUM OXIDE, AND MAGNESIUM OXIDE.
US282292A 1962-05-22 1963-05-22 Heat sink for a ferrite material employing metal oxides as the dielectric material Expired - Lifetime US3246262A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET22155A DE1165695B (en) 1962-05-22 1962-05-22 Broadband Y-circulator in hollow tube construction

Publications (1)

Publication Number Publication Date
US3246262A true US3246262A (en) 1966-04-12

Family

ID=7550418

Family Applications (1)

Application Number Title Priority Date Filing Date
US282292A Expired - Lifetime US3246262A (en) 1962-05-22 1963-05-22 Heat sink for a ferrite material employing metal oxides as the dielectric material

Country Status (3)

Country Link
US (1) US3246262A (en)
DE (1) DE1165695B (en)
GB (1) GB1042004A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356967A (en) * 1965-04-15 1967-12-05 William M Honig Microwave limiter comprising a thin conductor in the transmission means located in proximity to ferrite material
US3408597A (en) * 1966-05-11 1968-10-29 Bell Telephone Labor Inc Nonreciprocal gyromagnetic waveguide device with heat transfer means forming a unitary structure
US3452298A (en) * 1967-10-17 1969-06-24 Communications Satellite Corp Temperature compensated three-port stripline circulator
US4016509A (en) * 1974-11-06 1977-04-05 National Research Development Corporation Waveguide circulators
US4365215A (en) * 1981-01-21 1982-12-21 Rca Corporation High power coaxial power divider
US4369415A (en) * 1981-02-09 1983-01-18 Rca Corporation Space-loaded coaxial coupler
US4542357A (en) * 1983-07-27 1985-09-17 The United States Of America As Represented By The Secretary Of The Army Dielectric waveguide ferrite resonance isolator
EP0263242A1 (en) * 1986-10-04 1988-04-13 ANT Nachrichtentechnik GmbH Microwave junction-circulator
EP0263240A1 (en) * 1986-10-04 1988-04-13 ANT Nachrichtentechnik GmbH High-power high-frequency junction circulator
EP0263241A1 (en) * 1986-10-04 1988-04-13 ANT Nachrichtentechnik GmbH High-power high frequency junction circulator
US5285174A (en) * 1992-12-23 1994-02-08 Hughes Aircraft Company Temperature-compensated waveguide isolator
US20070139131A1 (en) * 2005-12-20 2007-06-21 Ems Technologies, Inc. Ferrite waveguide circulator with thermally-conductive dielectric attachments
US8217730B1 (en) 2011-04-13 2012-07-10 Raytheon Canada Limited High power waveguide cluster circulator
US20130058045A1 (en) * 2011-09-01 2013-03-07 International Business Machines Corporation Heatsink with substance embedded to suppress electromagnetic interference
WO2016187691A1 (en) * 2015-05-27 2016-12-01 Apollo Microwaves Ltd. E-plane waveguide circulator for operation above magnetic resonance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943274A (en) * 1956-07-10 1960-06-28 Sperry Rand Corp Microwave isolator
US3079570A (en) * 1961-01-25 1963-02-26 Aritron Inc Nonreciprocal wave guide junction
US3094676A (en) * 1959-12-21 1963-06-18 Raytheon Co Reciprocal microwave switching device using non-reciprocal components

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1118286B (en) * 1959-09-30 1961-11-30 Siemens Ag Non-reciprocal quadrupole

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943274A (en) * 1956-07-10 1960-06-28 Sperry Rand Corp Microwave isolator
US3094676A (en) * 1959-12-21 1963-06-18 Raytheon Co Reciprocal microwave switching device using non-reciprocal components
US3079570A (en) * 1961-01-25 1963-02-26 Aritron Inc Nonreciprocal wave guide junction

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356967A (en) * 1965-04-15 1967-12-05 William M Honig Microwave limiter comprising a thin conductor in the transmission means located in proximity to ferrite material
US3408597A (en) * 1966-05-11 1968-10-29 Bell Telephone Labor Inc Nonreciprocal gyromagnetic waveguide device with heat transfer means forming a unitary structure
US3452298A (en) * 1967-10-17 1969-06-24 Communications Satellite Corp Temperature compensated three-port stripline circulator
US4016509A (en) * 1974-11-06 1977-04-05 National Research Development Corporation Waveguide circulators
US4365215A (en) * 1981-01-21 1982-12-21 Rca Corporation High power coaxial power divider
US4369415A (en) * 1981-02-09 1983-01-18 Rca Corporation Space-loaded coaxial coupler
US4542357A (en) * 1983-07-27 1985-09-17 The United States Of America As Represented By The Secretary Of The Army Dielectric waveguide ferrite resonance isolator
EP0263242A1 (en) * 1986-10-04 1988-04-13 ANT Nachrichtentechnik GmbH Microwave junction-circulator
EP0263240A1 (en) * 1986-10-04 1988-04-13 ANT Nachrichtentechnik GmbH High-power high-frequency junction circulator
EP0263241A1 (en) * 1986-10-04 1988-04-13 ANT Nachrichtentechnik GmbH High-power high frequency junction circulator
US4794352A (en) * 1986-10-04 1988-12-27 Ant Nachrichtentechnik Gmbh High power junction circulator for high frequencies
US4810979A (en) * 1986-10-04 1989-03-07 Ant Nachrichtentechnik Gmbh Microwave junction circulator
US5285174A (en) * 1992-12-23 1994-02-08 Hughes Aircraft Company Temperature-compensated waveguide isolator
US20070139131A1 (en) * 2005-12-20 2007-06-21 Ems Technologies, Inc. Ferrite waveguide circulator with thermally-conductive dielectric attachments
EP1997184A2 (en) * 2005-12-20 2008-12-03 EMS Technologies, Inc. Ferrite waveguide circulator with thermally-conductive dielectric attachments
EP1997184A4 (en) * 2005-12-20 2009-09-09 Ems Technologies Inc Ferrite waveguide circulator with thermally-conductive dielectric attachments
US7683731B2 (en) 2005-12-20 2010-03-23 Ems Technologies, Inc. Ferrite waveguide circulator with thermally-conductive dielectric attachments
US8217730B1 (en) 2011-04-13 2012-07-10 Raytheon Canada Limited High power waveguide cluster circulator
US20130058045A1 (en) * 2011-09-01 2013-03-07 International Business Machines Corporation Heatsink with substance embedded to suppress electromagnetic interference
US8634195B2 (en) * 2011-09-01 2014-01-21 International Business Machines Corporation Heatsink with substance embedded to suppress electromagnetic interference
WO2016187691A1 (en) * 2015-05-27 2016-12-01 Apollo Microwaves Ltd. E-plane waveguide circulator for operation above magnetic resonance

Also Published As

Publication number Publication date
DE1165695B (en) 1964-03-19
GB1042004A (en) 1966-09-07

Similar Documents

Publication Publication Date Title
US3246262A (en) Heat sink for a ferrite material employing metal oxides as the dielectric material
US2812501A (en) Transmission line
US3205462A (en) Low-loss waveguide for propagation of h10 wave
US2749545A (en) Electromagnetic horn
US2926317A (en) Transmission line
US3739302A (en) Miniaturized ferrimagnetic circulator for microwaves
US3303439A (en) Strip transmission line interboard connection
US20180153046A1 (en) Apparatus for installing high and low voltage conversion circuit, high and low voltage conversion system and power source
US3205501A (en) Closely spaced stocked waveguide antenna array employing reciprocal ridged wageguide phase shifters
US3123782A (en) Around the mast rotary coupling having shielded stator
US3359510A (en) Microwave strip transmission line circulator having stepwise changes incenter conductor width for impedance matching purroses
US3036280A (en) Waveguide load
US3904993A (en) High power solid microwave load
US3178659A (en) Microwave switch having diodes situated in the waveguide channels to control coupling between common and branch channels
US3573681A (en) Helical waveguide formed from dielectric ribbon having symmetrically disposed conductive strips on opposite sides
US3309634A (en) Transmission line attenuators for high power
US3509495A (en) Strip transmission line termination device
US3324418A (en) Switching circulator having slots extending from the pole pieces to the exterior of the housing to overcome the shorted-turn effect
US3810048A (en) Resistive power load
US3212028A (en) Gyromagnetic isolator with low reluctance material within single ridge and fluid coolant adjacent waveguide
US3534296A (en) Tandem connected circulators
US2951999A (en) Constant impedance attenuator
US3072867A (en) Internal magnet coaxial line device
US3225318A (en) Heat transfer member for coaxial waveguide device
US3360750A (en) High frequency waveguide load comprising a dielectric window in contact with lossy coolant fluid