EP0005801A1 - Mikrowellenferritbauteil - Google Patents

Mikrowellenferritbauteil Download PDF

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Publication number
EP0005801A1
EP0005801A1 EP79101597A EP79101597A EP0005801A1 EP 0005801 A1 EP0005801 A1 EP 0005801A1 EP 79101597 A EP79101597 A EP 79101597A EP 79101597 A EP79101597 A EP 79101597A EP 0005801 A1 EP0005801 A1 EP 0005801A1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
set forth
magnetic material
microwave
microwave ferrite
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.)
Withdrawn
Application number
EP79101597A
Other languages
English (en)
French (fr)
Inventor
Shigeru Takeda
Masaharu Kawashima
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.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
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
Priority claimed from JP6246178A external-priority patent/JPS54153550A/ja
Priority claimed from JP6245978A external-priority patent/JPS54153548A/ja
Priority claimed from JP6246078A external-priority patent/JPS54153549A/ja
Priority claimed from JP6246278A external-priority patent/JPS54153551A/ja
Priority claimed from JP6245878A external-priority patent/JPS54153547A/ja
Priority claimed from JP6570578A external-priority patent/JPS54157458A/ja
Priority claimed from JP7064578A external-priority patent/JPS54161864A/ja
Priority claimed from JP14844778A external-priority patent/JPS5925481B2/ja
Priority claimed from JP14844878A external-priority patent/JPS5574208A/ja
Priority claimed from JP14845378A external-priority patent/JPS5574213A/ja
Priority claimed from JP14845478A external-priority patent/JPS5574214A/ja
Priority claimed from JP14845578A external-priority patent/JPS5574216A/ja
Priority claimed from JP14844978A external-priority patent/JPS5574209A/ja
Application filed by Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Publication of EP0005801A1 publication Critical patent/EP0005801A1/de
Withdrawn legal-status Critical Current

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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
    • H01P1/36—Isolators
    • 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
    • H01P1/387—Strip line circulators

Definitions

  • the present invention relates to a microwave ferrite component employable in VHF, UHF and microwave bands.
  • Microwave ferrite components for example a circulator-isolator which forms an important part of a microwave apparatus, are used widely in the microwave technical field for the purposes of producing transistors for handling large electric power, of matching between different circuit stages, of eliminating undesirable radiation, etc.
  • microwave ferrite components have become popular by the application of DC magnetic field. Furthermore, the performance of microwave ferrite components is largely developed with the manner of applying said DC magnetic field. For example, in regard to a microwave ferrite component as one of the most important parts of a microwave apparatus, i.e. a circulator-isolator, it is not too much to say that the insertion loss, the band width, the electrical power reistance, the dimensions of all components, etc. may be determined by the application of DC magnetic field.
  • the structure of a conventional microwave component is, for example, such a shown in Fig. 1, wherein two permanent magnets 3a and 3b are mounted at upper and lower portions in a housing 1 to play both roles of constituting a magnetic circuit and an electric field, while in the central space a ferrite core 6 and a central conductor 7 are enclosed by a shield plate 5 and mounted on an earth table 4.
  • the upper permanent magnet 3b can be moved by an adjustment screw 2 so that the magnet field applied to the ferrite core 5 may be finely controlled.
  • this sort of structure has some drawbacks, for example, that the magnetic field is uneven and unsatisfactory because of large insertion loss, that an adjustment screw for fine control of magnetic field is necessary and that the heat radiation can be only smoothly effected.
  • a convenient structure of magnetic circuit was considered in which, as shown in Fig. 2, a permanent magnet 9 is mounted near the center of a metal plate 8, and then a central conductor 13 and at least one ferrite core 12 enclosed by a shield plate 11 are disposed on said permanent magnet 9.
  • This microwave ferrite component structure was excellent in view of miniaturization, cost reduction and improvement of electric power resistance, as compared to the conventional structure shown in Fig. 1.
  • this structure had a drawback that it was difficult to find out the desirable conditions for simultaneously obtaining satisfactory band width and preventing insertion loss because the distribution of magnetic field was inferior in the zone around the ferrite core.
  • the intensity of magnetic field decreases rapidly along the central axis of the permanent magnet 9 in the direction away from the surface of the permanent magnet.
  • a ferrite material of 12.5 ⁇ x 20t in dimensions is employed for the permanent magnet
  • a large magnet field variation as about 64 x 10 3 A/m is found for a thickness of about 3.0 mm of the ferrite core.
  • this ferrite core structure may permit the thickness of the ferrite core 12 to be reduced extremely or the diameter of the permanent magnet 9 to be enlarged in order to improve the distribution of the magnetic field.
  • the thinning of the ferrite core involves a loss of electric power resistance, while the enlargement of the diameter of the permanent magnet prevents miniaturization. Since the ununiformity of magnet field distribution deteriorates a microwave ferrite component in its band width and its insertion loss, this drawback must be remedied by some means.
  • the object of the present invention is to propose a small-sized, high-efficient and low-cost microwave ferrite component which can enhance the conventional technical limit and can withstand high electric power.
  • a circulator-isolator of the present invention is characterized in that an earth plate is placed in close contact on a soft magnet material, and a shield plate containing both at least one ferrite core and at least one central conductor is placed in close contact on the center of said earth plate.
  • the magnetic circuit shown in Fig. 4 is so constructed that a permanent magnet 15 is disposed above a soft magnetic material 14.
  • This soft magnetic material 14 is prepared from an iron plate 1.0 mm thick and the permanent magnet 15 is prepared of a rare earth-alloyed magnet of 12.5 ⁇ x 2.Ot.
  • the iron plate is spaced about 3.5 mm from the rare earth-alloyed magnet.
  • the microwave ferrite component of the present invention is prepared with such a form that a ferrite core is inserted in the gap between said iron plate 14 and said rare -earth alloyed magnet 15.
  • Fig. 5 shows the measurement results of the axial distribution of the magnetic field in the center of said gap. Comparing with Fig. 3 for the earlier proposal, it is evident that the variation of magnetic field strength is about 8 to 16 x 10 3 A/m which is considerably less, and so the uniformity of magnetic field is much improved.
  • Fig. 6 is a cross-sectional view representing a first example of the present invention.
  • An earth plate 17 is placed in close contact on a soft magnetic material 16 (iron plate of 30 mm x 30 mm x 2 mm) and fastened solidly or with an eyelet.
  • a shield plate 20 containing two ferrite cores 18 of round disc type and three reticulate central conductors 19 is attached by solder to the approximate center of the upper part of said earth plate 17.
  • a permanent magnet 21 (rare-earth alloyed magnet of 18 ⁇ x 25t) is tightly attached by adhesive, etc. to the upper part of said ferrite core 18 through the shield plate 20.
  • the mentioned structure was employed to prepare a circulator-isolator of broad band concentration constant count type for 30 0 and a band of 800 MHz. It is evident by comparing the mentioned structure (Fig. 6) of the present invention with the structure of conventional technique (Fig. 1) that not only a permanent magnet is saved but also a case 1 of complicate shape and a screw 2 for adjusting the magnetic field are replaced by a soft magnetic plate 16. It is obvious that this means a simplification in structure.
  • a magnetic regulating material 23 is effectively placed on the permanent magnet 21 (Fig. 7).
  • a magnetic regulating material 23 having a Curie point of 50°C is so designed that the small temperature coefficient of the rare-earth alloyed magnet, i.e. 0.05%/°C, may be enhanced to nearly the temperature coefficient of the ferrite core, i.e. 0.3%/ C, as close as possible.
  • the application of this system could realize a circulator-isolator of broad band concentration constant count type for an 800 MHz band which can work stably within a broad temperature range from -30 to +80°C.
  • the microwave ferrite component of the present invention which is constructed as mentioned above is exposed to high electric power, the heat generated from the ferrite core 18 flows through the soft magnetic material 16 by the shortest way into a radiator plate 22 such as an aluminum table so that the temperature difference between the ferrite core 18 and other parts becomes small, and so the behaviour under high electric power is much stabilized.
  • a radiator plate 22 such as an aluminum table
  • the magnet itself has a heat-radiating effect so that the thermal resisting effect is more remarkable.
  • Figs. 8 to 11 show other realization examples for the present invention.
  • the permanent magnet 21 is fixed only with adhesive, there is a danger that the magnet may come off and drop after a long time because of vibration, heat or other factors.
  • a part of the field plate is employed to fix the permanent magnet.
  • FIG. 9 is a cross-sectional view of the example shown in Fig. 8.
  • a metal plate 25 can be added to fasten the permanent magnet 21 by soldering, etc. as shown in Fig. 10. If desired, a magnetic field-regulating material 26 may be inserted under this metal plate 25 to improve the temperature characteristic. If a magnetic regulating material is employed to prepare said metal plate 25, a single plate of magnetic regulating material can meet with both said functions.
  • said metal plate 25 may be provided with three through holes 25a, 25b and 25c as shown in Fig. 11, through which said L-shaped elbows 24a, 24b and 24c are passed and then bent to fasten themselves, thus realizing a very reliable microwave ferrite component.
  • FIG. 12 Other examples of realization for the present invention are shown in Figs. 12 and 13.
  • the structure as shown in Fig. 6 has a disadvantage that the shield plate 20 containing both ferrite cores 18 and the central conductor 19, after having been finished, must be fastened onto the earth plate 17 by soldering, etc.
  • This manner of preparation requires not only many processes but also two shield plates, while the permanent magnet 21 is too distant from the soft magnetic material 16 to have a desirable structure for the characteristic of the microwave component.
  • the present invention may take the structure of Fig. 12 to overcome said difficulties.
  • Fig. 12 the part of shield plate 27 in contact with earth plate 28 is omitted, and the shield plate is combined with the earth plate 28.
  • Fig. 13 shows the process for combining the shield plate 27 with the earth plate 28.
  • the earth plate 28 is mounted with L -fixtures 29 for gripping the ferrite core 18 with its central conductor 19.
  • the shield plate 27 prepared of a single plate covers the ferrite core 18 from above and is soldered to the vertical fingers of the L-fixtures 29.
  • This sort of structure works with a single shield plate 27 instead of the two shield plates 20 required in the structure of Fig. 6. It has the further advantage of shortening the process steps of construction.
  • the space between the permanent magnet 21 and the soft magnetic material 16 can be reduced by the thickness of shield plate 20, both the distribution of magnetic shield and the characteristic of circulator-isolator are improved.
  • Fig. 14 is a schematic assembly view of an isolator for 30°, 800 MHz according to the present invention.
  • numerals 30a and 30b denote terminals of strip line, 31 a condenser, 32 a coil, 33 a printed wiring plate, 34a and 34b earth terminals incorporated with an earth plate 36, 37 a dummy of a flat plate type for high electric power, 38 and 39 fixtures incorporated with the earth plate 36, 40 an insulating material and 41 a hole for mounting the isolator.
  • Figs. 15 and 16 are aspects of a realization example of a soft magnetic material for use in said isolator.
  • the part 16 of soft magnetic material corresponding to the terminals of strip line in the schematic view of the isolator for 30° 800 MHz band as shown in Fig. 14 is provided with notches 42 (Fig. 15) or portions 43 of reduced thickness clearance (Fig. 16) to interrupt the short circuit of the strip line terminals 30a and 30b with the soft magnetic material 16.
  • holses 44 for mounting the isolator are. provided.
  • the earth plate 36 is mounted with the fixtures 38 and 39, the fixture 38 being bent to thrust the dummy 37 against the soft magnetic material 16 through the insulator 40.
  • the fixture 39 is employed to ground one terminal of the dummy of flat plate type and to fasten the same simultaneously.
  • the dummy load 37 is disposed on the soft magnetic material 16.
  • the dummy load 37 employed in the present realization example is a resistor of flat plate type for high electric power and pasted on one side of an aluminum magnetic plate with a resistor membrane.
  • the surface opposite the membrane surface is bonded to the metal plate 16 with a heat sinker, etc. so as to enhance the thermal conductivity. Since this structure permits the heat generated from the dummy load 37 by the absorption of reverse electric power to flow directly to the soft magnetic material 16 and then to the heat radiation plate 22, considerable electric power can be absorbed.
  • An isolator with the soft magnetic material 16 employed in the experiment of the present realization example and dimensioned at 30 0 for 800 MHz band, could work steadily for a long time even when having absorbed a reflection electric power of about 30 W.
  • the conventional dummy load of 30 W class was placed outside and separately from the circulator, it is evident that an isolator of the present invention containing a dummy for high electric power may greatly reduce the volume share of entire microwave apparatus.
  • This exposure occasionally may cause the operator to touch the coil 32 by mistake to deform it thus changing its electric characteristics.
  • the coil 32 is exposed occasionally to interact with circuits other than the circulator-isolator.
  • This casing may be prepared from metal, non- metal, ferromagnetic material or nonmagnetic material, but was prepared from copper in the present realization example to achieve both objects of protection in handling and of electric interruption.
  • the above-mentioned structure of microwave ferrite component has one more difficulty. This difficulty is that the structure has no mechanism for fine adjustment of the magnetic field as shown in the conventional structure of Fig. 1 and should be replaced by some other means.
  • a permanent magnet 21 for use to this purpose is required as follows: The magnet must be easy magnetizable (first requirement) or must be stably maintained in magnetized condition against heat or other external disturbances (second requirement). A magnet of minimum coercive force I Hc is desirable for the first requirement, while a magnet of maximum coercive force is desirable for the second requirement. For example, a certain sort of rare earth-alloyed magnet having a particular stability has a coercive- force of more than 2.4 x 10 6 A/m, though some sorts of electromagnets are hardly demagnetizable. According to the structure of Fig.
  • the upper limit of coercive force I Hc should be determined from the fact that it must be a permanent magnet for a coercive force less than the magnetic field obtained with a broadly usable electromagnet.
  • the intensity of magnetic field for a broadly usable electromagnet depends on its dimensions, this intensity has a limit of 2 x 10 6 A/m for such dimensions that an ordinary microwave ferrite component manufacturer can possess. An apparatus which can generate a magnetic field stronger than this limit will be extremely complicate in its usage and also extraordinarily expensive in its installation cost.
  • the coercive force of a magnetizable and demagnetizable permanent magnet of this sort may be as follows:
  • the permeance for the magnetic circuit of Fig. 6 will be approximately unity, though it depends on the thickness of the permanent magnet.
  • the intensity of demagnetizing field is at a level of 0.4 x 10 6 A/m.
  • the demagnetization will be very difficult to control and the productivity will be reduced very much.
  • the upper limit of the coervice force of a permanent magnet according to the present invention should be 1.6 x 10 A/m.
  • the stability of a permanent magnet or the stability of microwave ferrite component is very important for the lower limit.
  • the structure of Fig. 6 according to the present invention is an open magnet circuit and is employed under condition of lower permeance, it must work under different conditions.
  • 'magnets of the ferrite group of lower coercive force were investigated to obtain the following value of the lower limit for I Hc.
  • a ferrite magnet of such dimensions that the permeance may be at a level of 4.0 was employed. Since the intensity of saturation magnetic flux of the ferrite magnet is approximately 0.32 x 10 6 A/m, the intensity of demagnetizing field in the magnetic circuit of Fig. 6 is approximately 80 x 10 3 A/m.
  • the magnetized condition at ambient temperature can be stabilized with an I Hc value at least 80 x 10 A/m, but this value of I Hc is insufficient for the stability in the presence of external disturbance such as the temperature variation or the access of other ferromagnetic material. This is because the intensity of saturation magnetic flux of the ferrite magnet or the intensity of the demagnetizing field increases at a rate of 0.2%/°C as the temperature falls, and the coercive force decreases at a rate of 0.4%/°C. Since the value of I Hc at ambient temperature should be at least 160 x 10 3 A/m, this value may be the lower limit for the present invention.
  • a rare earth-alloyed magnet of about 0.64 x 10 6 A/m in I Hc value was employed.
  • the present microwave ferrite component is free from instability against external disturbance or from irreversible changes by heat or by access of another ferromagnetic material, thus presenting an excellent performance. This proves that the effect of the present invention is remarkable.
  • Fig. 20 indicates the electric characteristics of a circulator of the concentration constant value type for the 800 MHz band having the structure of the present invention in the case of employing a rare earth-alloyed magnet of about 0.64 x 10 A/m in I Hc value. It was revealed that VSWR was less than 1.2, the isolation loss more than 20 dB and the insertion loss less than 0.6 dB in a broad range from 800 - 900 MHz, these characteristics being sufficient for high performance of the circulator.
  • the temperature rise in every part of the circulator was measured with an infrared thermometer.
  • the temperature rise of the conventional ferrite core amounted to as much as 10 to 20°C higher than that of the environment.
  • the temperature rise in the circulator of the structure according to the present invention was only 0 to 10°C, i.e. substantially the same as that of the environment.
  • FIG. 22 shows the system of the present invention applied to the circulator of the waveguide type, wherein numeral 18 denotes a ferrite core, 36 an earth conductor, 19 a central conductor, 144 a waveguide, 21 a permanent magnet and 16 a soft magnet material.
  • Fig. 23 shows another realization example for fine adjustment of the magnetic field according to the present invention.
  • a ferrite core 18 provided with a central conductor 19 is enveloped with a shield plate 20, and a permanent magnet 21 is mounted on a soft magnetic material 45 arranged above said core 18.
  • Said soft magnetic material 45 is bonded to the permanent magnet 21 with adhesive, etc. Since this structure permits the soft magnetic material to absorb the magnetic flux, the magnetic field is so uniformly distributed that the electric symmetry is excellent to provide a microwave ferrite component substantially free from insertion loss.
  • the regulation of the magnet field in the present invention is easily achieved by the control of dimensions such as diameter and thickness of the soft magnetic material.
  • the permeance of the employed magnet is increased by bonding the soft magnetic material to the permanent magnet. It is advantageous that even a material having the tendency of low temperature demagnetization such as a ferrite magnet can work steadily.
  • the working effect of the present invention is enhanced, because the distribution of magnetic field is regulated to become more uniform.
  • Fig. 24 is a schematic cross-sectional view elucidating another realization example of the present invention.
  • numeral 19 denotes a central conductor, 18 a ferrite core shielded outside electrically with a shield material 20 and held by the central conductor 19, said ferrite core 18 being mounted to the substantial center of a soft magnetic material 16 by a suitable means, for example, solder or adhesive and, if desired, through an earth plate 17.
  • a permanent magnet 21 is mounted to the other side of the ferrite core 18 through a magnetic flux-regulating material 46, and a magnetic field-regulating soft magnetic material 47 is disposed on the surface of the magnet 21 opposite the plane facing the soft magnetic material 16.
  • the DC magnetic field applied to the ferrite core 18 by the magnet 21 is extensively homogenized in the presence of the magnetic field regulating material 47 and also works to compensate the temperature variation of the magnetic flux generated from the magnet 21. Especially the latter effect is enchanced in the presence of the magnetic field regulating soft magnetic material 47.
  • the permeance of the magnetic circuit is enlarged in the presence of the magnetic field regulating material 46 and the soft magnetic material 47, while the temperature characteristic, particularly the characteristic at lower temperature, is improved. Furthermore, in the present realization example, since the magnetic field is finely regulated by controlling the thickness of the soft magnetic material 47, the position of permanent magnet is never changed by vibration or other different effects of the conventional technique, and the stability of the magnetic field after completion of the regulation is excellent.
  • Fig. 25 is a schematic cross-sectional view elucidating another realization example of the present invention.
  • numeral 19 denotes a central conductor, 18 a ferrite core shielded outside electrically with a shield material 20 and held by the central conductor 19, said ferrite core 18 being mounted to the substantial center of a soft magnetic material 16 by a suitable means, for example, solder or adhesive and, if desired, through an earth plate 17.
  • a permanent magnet 21 is mounted to the other side of ferrite core 18 through a magnetic flux-regulating nonmagnetic material 48.
  • Fig. 26 is a schematic cross-sectional view elucidating another realization example of the present invention.
  • a soft magnetic disc 49 is attached onto the magnet 21 with adhesive, etc., and the mounting point of said iron disc 49 is so shifted that the intensity of the magnetic shield may be controlled.
  • Iron discs of different dimensions were employed, though other soft magnetic pieces may be employed.
  • the soft magnetic piece is not required to be a disc but may have different shapes. In this manner, the diameter and thickness of iron disc 49 were changed in so many ways that the intensity of magnetic field applied to the ferrite core 18 could be changed. At lower temperatures, a permanent magnet is generally demagnetized, though a soft magnetic material piece can be attached to a permanent magnet according to the present invention so that the magnet may have a high permeance and becomes difficult to demagnetize.
  • Fig. 27 is a schematic cross-sectional view elucidating a further realization example of the present invention.
  • numeral 18 denotes a ferrite core holding a central conductor 19 and being shielded outside with a shielding material 20.
  • This ferrite core 18 is fastened to the approximate center of a soft magnetic material 16 by a suitable means such as solder or adhesive, etc. and, if desired, through an earth plate 17.
  • a permanent magnet 21 is mounted on the other side of ferrite core 18 through a soft magnetic material 50, and a magnetic field-regulating soft magnetic material 51 is disposed on the surface of the magnet 21 opposite the plane facing the soft magnetic material 16.
  • the DC magnetic field applied to the ferrite core 18 by the magnet 21 is extensively homogenized in the presence of the magnetic field-regulating materials 47, 51, so that a microwave ferrite component excellent in electric symmetry may be obtained. Furthermore in the present invention, the permeance of the magnetic circuit is enhanced by the presence of the soft magnetic materials 50, 51, and the temperature characteristic, particularly the lower temperature characteristic, is improved. Also in the present invention, since the magnetic field is finely regulated by controlling the thickness of soft magnetic material 51 and the dimensions such as diameter, etc., the position of the permanent magnet is never shifted even under the influence of vibration, etc. contrary to the conventional technique. Thus an excellent stability of the magnetic field is obtained after completion of the regulating process.
  • Fig. 28 is a schematic cross-sectional view elucidating a realization example of the present invention.
  • numeral 18 denotes a ferrite core holding a central conductor 19 and being shielded outside with a shielding material 20.
  • This ferrite core 18 is fastened to the ' approximate center of a soft magnetic material 16 by a suitable means such as solder or adhesive, etc. and, if desired, through an earth plate 17.
  • a permanent magnet 21 is mounted on the other side of the ferrite core 2 0 through a soft magnetic material 52, and a magnetic field regulating soft magnetic material 53 is disposed on the surface of the magnet 21 opposite the plane facing the soft magnetic material 16.
  • a magnetic field-regulating material 54 is wound annully about said permanent magnet 21.
  • the DC magnetic field applied to the ferrite core 18 by the magnet 21 is extensively homogenized in the presence of the magnetic field-regulating materials 52, 53, so that a microwave ferrite component excellent in electric symmetry may be obtained.
  • the presence of the soft magnetic materials 52, 53 and the magnetic field-regulating material 54 permits this material 54 to work in parallel with the magnetic circuit and enhance the permeance of the magnetic circuit, thus improving the temperature characteristic, particularly the lower temperature characteristic.
  • the magnetic field is finely regulated by controlling the thickness of the soft magnetic material 53, the position of the permanent magnet is never shifted even under the' influence of vibration etc. contrary to the conventional technique. Thus an excellent stability of the magnetic field is assured after completion of the regulating process.
  • the actual regulation of the magnetic field assures excellent workability when several magnetic materials of different shapes and techniques are prepared and an optimal magnetic material is selected among them.
  • certain conventional parts such as a casing of complicate shape can be saved so that the apparatus may be miniaturized. For example, a 30° circulator could be miniaturized to about half size comparing with the conventional circulator.
  • the microwave ferrite component of the present invention is not only miniaturized and prepared at reduced cost but also excellent in electric symmetry and thermal stability. According to such minaturi- zation, the apparatus may be installed in automobiles, airplanes and artificial satellites, and may develop new application fields. Its industrial effects will be extensive.

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EP79101597A 1978-05-25 1979-05-23 Mikrowellenferritbauteil Withdrawn EP0005801A1 (de)

Applications Claiming Priority (26)

Application Number Priority Date Filing Date Title
JP6245978A JPS54153548A (en) 1978-05-25 1978-05-25 Microwave ferrite element
JP62459/78 1978-05-25
JP6246078A JPS54153549A (en) 1978-05-25 1978-05-25 Microwave ferrite element
JP6246278A JPS54153551A (en) 1978-05-25 1978-05-25 Microwave ferrite element
JP62461/78 1978-05-25
JP62460/78 1978-05-25
JP62462/78 1978-05-25
JP6245878A JPS54153547A (en) 1978-05-25 1978-05-25 Microwave ferrite element
JP6246178A JPS54153550A (en) 1978-05-25 1978-05-25 Microwave ferrite element
JP62458/78 1978-05-25
JP65705/78 1978-06-02
JP6570578A JPS54157458A (en) 1978-06-02 1978-06-02 Circulator and isolator
JP70645/78 1978-06-12
JP7064578A JPS54161864A (en) 1978-06-12 1978-06-12 Isolator
JP14844778A JPS5925481B2 (ja) 1978-11-30 1978-11-30 サ−キユレ−タおよびアイソレ−タ
JP14844878A JPS5574208A (en) 1978-11-30 1978-11-30 Circulator and isolator
JP148455/78 1978-11-30
JP14845378A JPS5574213A (en) 1978-11-30 1978-11-30 Microwave ferrite element
JP14845478A JPS5574214A (en) 1978-11-30 1978-11-30 Microwave ferrite element
JP14845578A JPS5574216A (en) 1978-11-30 1978-11-30 Isolator
JP148453/78 1978-11-30
JP14844978A JPS5574209A (en) 1978-11-30 1978-11-30 Circulator and isolator
JP148454/78 1978-11-30
JP148448/78 1978-11-30
JP148447/78 1978-11-30
JP148449/78 1978-11-30

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EP0005801A1 true EP0005801A1 (de) 1979-12-12

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EP79101597A Withdrawn EP0005801A1 (de) 1978-05-25 1979-05-23 Mikrowellenferritbauteil

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984003392A1 (en) * 1983-02-28 1984-08-30 Motorola Inc Circulator having an image magnet
EP0860891A1 (de) * 1997-02-22 1998-08-26 Philips Patentverwaltung GmbH Mikrowellen-Bauelement
EP1303000A1 (de) * 2001-10-10 2003-04-16 Marconi Communications GmbH Zirkulator
EP1619744A1 (de) * 2004-07-20 2006-01-25 M/A-Com, Inc. Ferritzirkulator mit Ausrichteinrichtungen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1518671A (fr) * 1965-10-24 1968-03-29 Motorola Inc Circulateur hyperfréquence
DE1280354B (de) * 1965-12-23 1968-10-17 Telefunken Patent Breitbandig angepasster, verlustarmer Verzweigungs-Zirkulator
DE1282754B (de) * 1966-03-28 1968-11-14 Siemens Ag Zirkulator mit konzentrierten Schaltelementen fuer kurze elektromagnetische Wellen
US3621476A (en) * 1969-10-02 1971-11-16 Tdk Electronics Co Ltd Circulator having heat dissipating plate
US3739302A (en) * 1971-06-01 1973-06-12 Trak Microwave Corp Miniaturized ferrimagnetic circulator for microwaves
DE2226509A1 (de) * 1972-05-31 1973-12-13 Philips Patentverwaltung Breitbandzirkulator
FR2204986A5 (de) * 1972-10-26 1974-05-24 Creusot Loire

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1518671A (fr) * 1965-10-24 1968-03-29 Motorola Inc Circulateur hyperfréquence
DE1280354B (de) * 1965-12-23 1968-10-17 Telefunken Patent Breitbandig angepasster, verlustarmer Verzweigungs-Zirkulator
DE1282754B (de) * 1966-03-28 1968-11-14 Siemens Ag Zirkulator mit konzentrierten Schaltelementen fuer kurze elektromagnetische Wellen
US3621476A (en) * 1969-10-02 1971-11-16 Tdk Electronics Co Ltd Circulator having heat dissipating plate
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984003392A1 (en) * 1983-02-28 1984-08-30 Motorola Inc Circulator having an image magnet
EP0860891A1 (de) * 1997-02-22 1998-08-26 Philips Patentverwaltung GmbH Mikrowellen-Bauelement
EP1303000A1 (de) * 2001-10-10 2003-04-16 Marconi Communications GmbH Zirkulator
US7196593B2 (en) 2001-10-10 2007-03-27 Marconi Communications Gmbh Microwave circulator with deformable membrane
EP1619744A1 (de) * 2004-07-20 2006-01-25 M/A-Com, Inc. Ferritzirkulator mit Ausrichteinrichtungen
US7170362B2 (en) 2004-07-20 2007-01-30 M/A-Com, Inc. Ferrite circulator having alignment members

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