US3778836A - Magnetic antenna having a block or circuit components therein - Google Patents
Magnetic antenna having a block or circuit components therein Download PDFInfo
- Publication number
- US3778836A US3778836A US00137998A US3778836DA US3778836A US 3778836 A US3778836 A US 3778836A US 00137998 A US00137998 A US 00137998A US 3778836D A US3778836D A US 3778836DA US 3778836 A US3778836 A US 3778836A
- Authority
- US
- United States
- Prior art keywords
- magnetic
- receiver
- antenna
- magnetic core
- core
- 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
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 64
- 238000004804 winding Methods 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 40
- 239000000696 magnetic material Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
Definitions
- An antenna for a receiver comprising a magnetic core in the form of a thin layer having a thickness less than 50 microns superposed on a casing of a receiver or on a block of components of the receiver, and a winding wound on said magnetic core and connected electrically to the components in the casing or in the block, the winding serving as the antenna for the receiver.
- a receiver which comprises said antenna.
- This invention relates to an antenna for a receiver for electromagnetic waves such as a radio receiver, and more particularly to an antenna comprising a magnetic core in the form of a thin layer superposed on the casing of the receiver or on a block of components of the receiver.
- a conventional antenna for use in a receiver such as a radio receiver, comprises a magnetic core having a winding thereon.
- the magnetic core consists of, for example, a ferrite material having a high magnetic permeability and is usually in the form of a rod, a plate, or a tube. It is well-known that the ratio of the length to the crosssectional area of a magnetic core is one of the factors which affects the sensitivity of an antenna having said magnetic core. A higher ratio results in a higher sensitivity. As a practical matter, it is not easy to obtain a higher ratio because the maximum length of the magnetic core is limited by the size of the casing containing the radio receiver.
- a tubular core has a higher mechanical strength than a rod core with the same cross-sectional area and length, but the tubular core has a larger outside dimension than a rod core.
- a receiver be small in size.
- Recent developments in the electronic component industry have succeeded in miniaturizing the electronic components by employing various new elements, for example, transistors instead of electron tubes.
- new techniques such as those for making micromodules and integrated circuits have increased the packing density of the components.
- Another object of the invention is to provide an antenna comprising a magnetic core in the form of a thin layer having a thickness less than 50 microns superposed on the casing of a receiver or on a block of components of a receiver.
- a further object of the invention is to provide a receiver, the casing of which has a magnetic core in the form of a thin layer superposed thereon which acts as an antenna.
- a further object of the invention is to provide a receiver in which a block of components are combined with a magnetic core in the form of a thin layer superposed thereon.
- the antenna according to the invention comprises a magnetic core in the form ofa thin layer superposed on a casing of a receiver or on a block of components of a receiver and a winding on said magnetic core.
- FIG. 1 is a perspective view of one embodiment of an antenna according to the invention, partly broken away;
- FIG. 2 is a longitudinal sectional view of the antenna of FIG. 1;
- FIG. 3 is a cross-sectional view taken along the line 3-3 of FIG. 2;
- FIG. 4 is a perspective view, partly broken away, of
- FIG. 5 is a longitudinal sectional view of the antenna of FIG. 4;
- FIG. 6 is a cross-sectional view, similar to FIG. 3, showing an embodiment in which a laminated magentic core is used.
- FIG. 7 is a cross-sectional view similar to FIG. 3 showing an embodiment in which a magnetic core is rolled on the casing.
- the present invention is an antenna for use in a receiver for electromagnetic waves, which antenna comprises a magnetic core in the form ofa thin layer superposed on the cylindrical portion of a casing of the receiver or on a block of components of the receiver, said layer having a thickness less than 50 microns.
- the provision of a magnetic core in the form of a layer superposed on a casing or on a block of components makes the cross-sectional area of the magnetic material of the core smaller and increases the ratio of this length to the cross-sectional area.
- the magnetic core according to this invention is very thin, but the overall assembly has a higher mechanical strength than conventional antenna cores, because the casing or a block of components themselves strengthens said magnetic core.
- reference character 11 designates the right cylindrical portion of a casing of a receiver.
- the portion 11 has a hollow interior 12. All the components of the receiver, for example, resistors, transformers, transistors and speakers (not shown in the FIGS.) are combined together into a receiver network and are positioned in the hollow interior 12 of the casing portion 11.
- a magnetic core 13 in the form of a thin layer having a thickness less than 50 microns is superposed on the casing portion 11.
- the magnetic core according to the invention can be prepared from any available magnetic material having a high magnetic permeability.
- a winding 14 is wound on the magnetic core 13 by a per-se well known method for making an antenna for a receiver and the winding 14 is coupled to the receiver components positioned in the hollow interior 12. It is preferable that the core 13 and the winding 14 be covered by a plastic .film 15, such as vinyl or epoxy, in order to provide the antenna with a high resistance to moisture.
- the casing has a front cover 16 and a back cover 17. These covers 16 and 17 protect the components in the hollow interior 12.
- the controlling components such as tuning or switching components, are positioned nearest to the covers 16 and 17 for easy handling.
- a block 21 of components is made of various components combined together into an electrical circuit and is cast or molded into a simple cylindrical form, such as a circular cylinder, a plate or a parallelepiped by using suitable plastics such as epoxy resin or polyester resin.
- suitable plastics such as epoxy resin or polyester resin.
- the necessary lead wires 22 of the block 21 extend to the casting or molding material and are connected with other components so as to form a receiver network.
- the block 21 has a magnetic core 23 in the form of a thin layer having a thickness less than 50 microns superposed thereon, a winding 24 wound on the core 23, and a protection film 25 which covers the core 23 and the winding 24, as described in connection with the embodiment of FIGS. 1-3.
- Magnetic cores Materials which can be used for said magnetic cores are iron, iron nickel alloys, various ferrites and powder cores.
- the magnetic core in the form of a thin layer can be superposed on the casing 11 or on the block 21 by using per-se well known techniques, such as adhesion of magnetic sheets or magnetic particles, electroless plating, vacuum deposition or applying a magnetic paste containing magnetic powder, such as iron powder, iron alloy powder, or ferrite powder and suitable and available binding material, such as epoxy, polyester and vinyl.
- Metals have very low electrical resistivities. Therefore, when a magnetic sheet made of a metal such as iron or nickel alloys is superposed on the casing 11 (or on the block 21), care should be taken that the magnetic core 13 has at least one gap 18 to prevent an electrically short circuited winding of the core 13, as shown in FIG. 3. In addition, it is desirable for preventing eddy currents that a laminated magnetic core composed of very thin individual layers 13a, 13b, and 130, as shown in FIG. 6, and together having a thickness of 50 microns be employed instead of a magnetic core in one body, such as the layer 13 of FIG. 3 or 23 of FIG. 5.
- a magnetic core in the form of a single thin layer 13d wrapped a plurality of times around the casing 11, as shown in FIG. 7.
- the same wrapping can be placed on block 21 shown in FIG. 5.
- the magnetic core l3d has the same effect when it is in the form of the laminated core in FIG. 7 for the prevention of the eddy current and needs no gap, such as the gap 18 shown in FIG. 3.
- An antenna consisting essentially of a casing for a receiver having at least a portion thereof in the shape of a cylinder, a magnetic core in the form of a thin layer consisting of high magnetic permeability material superposed on the cylindrical portion of the casing, said layer having a thickness less than 50 microns and having substantially no intrinsic strength and a winding wound on said magnetic core, the casing supplying the strength for supporting the winding and the core.
- said magnetic core is of a magnetic metal and has at least one gap therein extending the length of said core parallel to the longitudinal axis thereof.
- said thin layer is a thin sheet of magnetic metal wrapped around said casing a plurality of times the total thickness of the layer being less than 50 microns.
- said thin layer is a plurality of thicknesses of magnetic material having a total thickness of less than 50 mi crons.
- a block of components for a receiver having at least a portion thereof in the shape of a cylinder and an antenna consisting essentially of a magnetic core in the form of a thin layer consisting of high magnetic permeability material superposed on the cylindrical portion of said block of components, said layer having a thickness less than 50 microns and having substantially no intrinsic strength, and a winding on said magnetic core.
- said magnetic core is of a magnetic metal and has at least one gap therein extending the length of said core parallel to the longitudinal axis thereof.
- said thin layer is a thin sheet of magnetic metal wrapped around said block of components a plurality of times, the total thickness of the layer being less than 50 microns.
- said thin layer is a plurality of thicknesses of magnetic material having a total thickness of less than 50 microns.
Landscapes
- Soft Magnetic Materials (AREA)
Abstract
An antenna for a receiver comprising a magnetic core in the form of a thin layer having a thickness less than 50 microns superposed on a casing of a receiver or on a block of components of the receiver, and a winding wound on said magnetic core and connected electrically to the components in the casing or in the block, the winding serving as the antenna for the receiver. A receiver which comprises said antenna.
Description
Related US. Application Data Continuation-in-part of Ser. No. 679,351, Oct. 31, 1967, abandoned.
Umted States Patent 1 111 3,778,836 Tanaka Dec. 11, 1973 [54] MAGNETIC ANTENNA'HAVING A BLOCK 3,271,718 9/1966 Shaw 336/234 x 3,372,395 3/1968 Kline 0R CIRCUIT COMPONENTS THEREIN 3,538,441 11/1970 Tanaka 343 702 X [76] Inventor: Takashi Tanaka, 340 Oaza Kisaichi,
Katano-cho, Kitakawachi-gun, FOREIGN PATENTS OR APPLICATIONS Osaka-f, Japan 1,090,140 6/1958 Germany 343/787 [2 Filed: p 27, 1971 OTHER PUBLICATIONS [21] App]. No.: 137,998 Polydoroff, W. .1 R.E.E.Ferromagnetic Loop Antennas, Radio-Electronic Eng. Edition of Radio & TV News, 11-1951, pp. 11-13, 24.
Polydoroff, W. J High-Frequency Magnetic Materials John Wiley & Sons, 1960, pp. 1-3.
Burgess, R. E., Iron-Cored Loop Receiving Aerial Wireless Engineer, 6-1946, pp. 172-178.
Primary Examiner-Rudolph V. Rolinec Assistant ExaminerWm. H. Punter Atz0rneyWenderoth, Lind & Ponack 5 7 ABSTRACT An antenna for a receiver comprising a magnetic core in the form of a thin layer having a thickness less than 50 microns superposed on a casing of a receiver or on a block of components of the receiver, and a winding wound on said magnetic core and connected electrically to the components in the casing or in the block, the winding serving as the antenna for the receiver. A receiver which comprises said antenna.
10 Claims, 7 Drawing Figures MAGNETIC ANTENNA HAVING A BLOCK OR CIRCUIT COMPONENTS THEREIN This is a continuation-in-part of application Ser. No. 679,351, filed Oct. 31, 1967, now abandoned.
BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an antenna for a receiver for electromagnetic waves such as a radio receiver, and more particularly to an antenna comprising a magnetic core in the form of a thin layer superposed on the casing of the receiver or on a block of components of the receiver.
2. Prior Art A conventional antenna for use in a receiver, such as a radio receiver, comprises a magnetic core having a winding thereon. The magnetic core consists of, for example, a ferrite material having a high magnetic permeability and is usually in the form of a rod, a plate, or a tube. It is well-known that the ratio of the length to the crosssectional area of a magnetic core is one of the factors which affects the sensitivity of an antenna having said magnetic core. A higher ratio results in a higher sensitivity. As a practical matter, it is not easy to obtain a higher ratio because the maximum length of the magnetic core is limited by the size of the casing containing the radio receiver. It is also difficult to reduce the cross-sectional area of the magnetic core of a ferrite because the ferrite has poor mechanical strength. For example, a thin rod or plate which is long is easily broken, if the receiver is dropped carelessly on the ground during handling. A tubular core has a higher mechanical strength than a rod core with the same cross-sectional area and length, but the tubular core has a larger outside dimension than a rod core.
It is desirable that a receiver be small in size. Recent developments in the electronic component industry have succeeded in miniaturizing the electronic components by employing various new elements, for example, transistors instead of electron tubes. Moreover, new techniques such as those for making micromodules and integrated circuits have increased the packing density of the components. On the other hand, it has not been possible to reduce the size of the antenna without decreasing the sensitivity and/or the mechanical strength thereof. Therefore, the conventional antenna occupies quite a large space in a radio receiver in comparison with the other miniaturized components and limits miniaturization of a receiver.
SUMMARY OF THE INVENTION It is an object of the present invention to provide an antenna having a high sensitivity, a high mechanical strength and/or a small volume.
Another object of the invention is to provide an antenna comprising a magnetic core in the form of a thin layer having a thickness less than 50 microns superposed on the casing of a receiver or on a block of components of a receiver.
A further object of the invention is to provide a receiver, the casing of which has a magnetic core in the form of a thin layer superposed thereon which acts as an antenna.
A further object of the invention is to provide a receiver in which a block of components are combined with a magnetic core in the form of a thin layer superposed thereon.
The antenna according to the invention comprises a magnetic core in the form ofa thin layer superposed on a casing of a receiver or on a block of components of a receiver and a winding on said magnetic core.
BRIEF DESCRIPTION OF THE FIGURES The invention will now be described in connection with the accompanying drawings, in which:
FIG. 1 is a perspective view of one embodiment of an antenna according to the invention, partly broken away;
FIG. 2 is a longitudinal sectional view of the antenna of FIG. 1;
FIG. 3 is a cross-sectional view taken along the line 3-3 of FIG. 2;
FIG. 4 is a perspective view, partly broken away, of
another embodiment;
FIG. 5 is a longitudinal sectional view of the antenna of FIG. 4;
FIG. 6 is a cross-sectional view, similar to FIG. 3, showing an embodiment in which a laminated magentic core is used; and
FIG. 7 is a cross-sectional view similar to FIG. 3 showing an embodiment in which a magnetic core is rolled on the casing.
DESCRIPTION OF PREFERRED EMBODIMENTS The present invention is an antenna for use in a receiver for electromagnetic waves, which antenna comprises a magnetic core in the form ofa thin layer superposed on the cylindrical portion of a casing of the receiver or on a block of components of the receiver, said layer having a thickness less than 50 microns. The provision of a magnetic core in the form of a layer superposed on a casing or on a block of components makes the cross-sectional area of the magnetic material of the core smaller and increases the ratio of this length to the cross-sectional area. The magnetic core according to this invention is very thin, but the overall assembly has a higher mechanical strength than conventional antenna cores, because the casing or a block of components themselves strengthens said magnetic core. A magnetic core in the form of a thin layer superposed on the casing or the block of components requires no special space for the antenna and miniaturizes the receiver in accordance with this invention. Referring to FIGS. 1, 2 and 3, reference character 11 designates the right cylindrical portion of a casing of a receiver. The portion 11 has a hollow interior 12. All the components of the receiver, for example, resistors, transformers, transistors and speakers (not shown in the FIGS.) are combined together into a receiver network and are positioned in the hollow interior 12 of the casing portion 11.
A magnetic core 13 in the form of a thin layer having a thickness less than 50 microns is superposed on the casing portion 11. The magnetic core according to the invention can be prepared from any available magnetic material having a high magnetic permeability.
A winding 14 is wound on the magnetic core 13 by a per-se well known method for making an antenna for a receiver and the winding 14 is coupled to the receiver components positioned in the hollow interior 12. It is preferable that the core 13 and the winding 14 be covered by a plastic .film 15, such as vinyl or epoxy, in order to provide the antenna with a high resistance to moisture.
The casing has a front cover 16 and a back cover 17. These covers 16 and 17 protect the components in the hollow interior 12. The controlling components, such as tuning or switching components, are positioned nearest to the covers 16 and 17 for easy handling.
Referring to FIGS. 4 and 5, a block 21 of components is made of various components combined together into an electrical circuit and is cast or molded into a simple cylindrical form, such as a circular cylinder, a plate or a parallelepiped by using suitable plastics such as epoxy resin or polyester resin. The necessary lead wires 22 of the block 21 extend to the casting or molding material and are connected with other components so as to form a receiver network.
The block 21 has a magnetic core 23 in the form of a thin layer having a thickness less than 50 microns superposed thereon, a winding 24 wound on the core 23, and a protection film 25 which covers the core 23 and the winding 24, as described in connection with the embodiment of FIGS. 1-3.
Materials which can be used for said magnetic cores are iron, iron nickel alloys, various ferrites and powder cores. The magnetic core in the form of a thin layer can be superposed on the casing 11 or on the block 21 by using per-se well known techniques, such as adhesion of magnetic sheets or magnetic particles, electroless plating, vacuum deposition or applying a magnetic paste containing magnetic powder, such as iron powder, iron alloy powder, or ferrite powder and suitable and available binding material, such as epoxy, polyester and vinyl.
Metals have very low electrical resistivities. Therefore, when a magnetic sheet made of a metal such as iron or nickel alloys is superposed on the casing 11 (or on the block 21), care should be taken that the magnetic core 13 has at least one gap 18 to prevent an electrically short circuited winding of the core 13, as shown in FIG. 3. In addition, it is desirable for preventing eddy currents that a laminated magnetic core composed of very thin individual layers 13a, 13b, and 130, as shown in FIG. 6, and together having a thickness of 50 microns be employed instead of a magnetic core in one body, such as the layer 13 of FIG. 3 or 23 of FIG. 5. It is preferable to use a magnetic core in the form of a single thin layer 13d wrapped a plurality of times around the casing 11, as shown in FIG. 7. The same wrapping can be placed on block 21 shown in FIG. 5. The magnetic core l3d has the same effect when it is in the form of the laminated core in FIG. 7 for the prevention of the eddy current and needs no gap, such as the gap 18 shown in FIG. 3.
What is claimed is:
1. An antenna consisting essentially of a casing for a receiver having at least a portion thereof in the shape of a cylinder, a magnetic core in the form of a thin layer consisting of high magnetic permeability material superposed on the cylindrical portion of the casing, said layer having a thickness less than 50 microns and having substantially no intrinsic strength and a winding wound on said magnetic core, the casing supplying the strength for supporting the winding and the core.
2. An antenna as claimed in claim 1 wherein said magnetic core is of a magnetic metal and has at least one gap therein extending the length of said core parallel to the longitudinal axis thereof.
3. An antenna as claimed in claim 1 wherein said thin layer is a thin sheet of magnetic metal wrapped around said casing a plurality of times the total thickness of the layer being less than 50 microns.
4. The combination as claimed in claim 1 in which said thin layer is a single layer of magnetic material.
5. The combination as claimed in claim 1 in which said thin layer is a plurality of thicknesses of magnetic material having a total thickness of less than 50 mi crons.
6. In combination, a block of components for a receiver having at least a portion thereof in the shape of a cylinder and an antenna consisting essentially of a magnetic core in the form of a thin layer consisting of high magnetic permeability material superposed on the cylindrical portion of said block of components, said layer having a thickness less than 50 microns and having substantially no intrinsic strength, and a winding on said magnetic core.
7. The combination as claimed in claim 6 wherein said magnetic core is of a magnetic metal and has at least one gap therein extending the length of said core parallel to the longitudinal axis thereof.
8. The combination as claimed in claim 6 wherein said thin layer is a thin sheet of magnetic metal wrapped around said block of components a plurality of times, the total thickness of the layer being less than 50 microns.
9. The combination as claimed in claim 6 in which said thin layer is a single layer of magnetic material.
10. The combination as claimed in claim 6 in which said thin layer is a plurality of thicknesses of magnetic material having a total thickness of less than 50 microns.
Claims (10)
1. An antenna consisting essentially of a casing for a receiver having at least a portion thereof in the shape of a cylinder, a magnetic core in the form of a thin layer consisting of high magnetic permeability material superposed on the cylindrical portion of the casing, said layer having a thickness less than 50 microns and having substantially no intrinsic strength and a winding wound on said magnetic core, the casing supplying the strength for supporting the winding and the core.
2. An antenna as claimed in claim 1 wherein said magnetic core is of a magnetic metal and has at least one gap therein extending the length of said core parallel to the longitudinal axis thereof.
3. An antenna as claimed in claim 1 wherein said thin layer is a thin sheet of magnetic metal wrapped around said casing a plurality of times the total thickness of the layer being less than 50 microns.
4. The combination as claimed in claim 1 in which said thin layer is a single layer of magnetic material.
5. The combination as claimed in claim 1 in which said thin layer is a plurality of thicknesses of magnetic material having a total thickness of less than 50 microns.
6. In combination, a block of components for a receiver having at least a portion thereof in the shape of a cylinder and an antenna consisTing essentially of a magnetic core in the form of a thin layer consisting of high magnetic permeability material superposed on the cylindrical portion of said block of components, said layer having a thickness less than 50 microns and having substantially no intrinsic strength, and a winding on said magnetic core.
7. The combination as claimed in claim 6 wherein said magnetic core is of a magnetic metal and has at least one gap therein extending the length of said core parallel to the longitudinal axis thereof.
8. The combination as claimed in claim 6 wherein said thin layer is a thin sheet of magnetic metal wrapped around said block of components a plurality of times, the total thickness of the layer being less than 50 microns.
9. The combination as claimed in claim 6 in which said thin layer is a single layer of magnetic material.
10. The combination as claimed in claim 6 in which said thin layer is a plurality of thicknesses of magnetic material having a total thickness of less than 50 microns.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP92266 | 1966-12-27 | ||
JP1066 | 1966-12-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3778836A true US3778836A (en) | 1973-12-11 |
Family
ID=26332915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00137998A Expired - Lifetime US3778836A (en) | 1966-12-27 | 1971-04-27 | Magnetic antenna having a block or circuit components therein |
Country Status (1)
Country | Link |
---|---|
US (1) | US3778836A (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4004228A (en) * | 1974-04-29 | 1977-01-18 | Integrated Electronics, Ltd. | Portable transmitter |
US4123756A (en) * | 1976-09-24 | 1978-10-31 | Nippon Electric Co., Ltd. | Built-in miniature radio antenna |
FR2528644A1 (en) * | 1982-06-10 | 1983-12-16 | Sensormatic Electronics Corp | FLOW GUIDING WINDING ASSEMBLY, IN PARTICULAR FOR A COMMUNICATION DEVICE |
US4679233A (en) * | 1985-08-30 | 1987-07-07 | Motorola, Inc. | Microphone |
US4740794A (en) * | 1986-01-03 | 1988-04-26 | Motorola, Inc. | Connectorless antenna coupler |
EP0382130A2 (en) * | 1989-02-10 | 1990-08-16 | Junghans Uhren Gmbh | Small radio-controlled clock with an antenna coil |
EP0630068A1 (en) * | 1993-06-21 | 1994-12-21 | Raytheon Company | Radar system and components therefor for transmitting an electromagnetic signal underwater |
DE19854160A1 (en) * | 1998-11-24 | 2000-06-08 | Koepenick Funkwerk Gmbh | Longwave radio receiver for distance remote-control has ferrite core of ferrite antenna formed as hollow body for acting as Faraday cage for receiver components inserted in its interior |
US6400330B1 (en) * | 2000-06-13 | 2002-06-04 | Aisin Seiki Kabushiki Kaisha | Bar antenna and method of manufacturing the same |
US20040201536A1 (en) * | 2003-04-08 | 2004-10-14 | Masahiro Ohara | Antenna device for vehicles and vehicle antenna system and communication system using the antenna device |
WO2005086282A1 (en) * | 2004-02-27 | 2005-09-15 | Societe De Technologie Michelin | Transmission and/or reception device which is intended to be mounted to a vehicle wheel and a housing for one such device |
US20050237254A1 (en) * | 2004-04-27 | 2005-10-27 | Nec Tokin Corporation | Coil antenna |
EP1592085A1 (en) * | 2004-04-27 | 2005-11-02 | Nec Tokin Corporation | Coil Antenna |
US20060195036A1 (en) * | 2005-02-25 | 2006-08-31 | Hisao Nakamura | Heartbeat measuring device |
US7167140B2 (en) | 2003-07-02 | 2007-01-23 | Nec Tokin Corporation | Coil antenna |
US20070091007A1 (en) * | 2005-08-04 | 2007-04-26 | Murata Manufacturing Co., Ltd. | Coil antenna |
US20140057686A1 (en) * | 2011-11-02 | 2014-02-27 | Pong Research Corporation | Protective cover for a wireless device |
US9065169B2 (en) | 2013-06-25 | 2015-06-23 | University Of New Hampshire | High frequency magnetic field antenna |
US9172134B2 (en) | 2008-11-06 | 2015-10-27 | Antenna79, Inc. | Protective cover for a wireless device |
US9287915B2 (en) | 2008-11-06 | 2016-03-15 | Antenna79, Inc. | Radiation redirecting elements for portable communication device |
US20160093953A1 (en) * | 2014-09-30 | 2016-03-31 | Fujitsu Limited | Frequency characteristic adjusting jig, antenna testing apparatus and antenna testing method, and loop antenna |
US9472841B2 (en) | 2008-11-06 | 2016-10-18 | Antenna79, Inc. | RF radiation redirection away from portable communication device user |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1550889A (en) * | 1924-09-15 | 1925-08-25 | James A Doran | Induction device and magnetic circuits for the same |
US2256803A (en) * | 1939-08-17 | 1941-09-23 | Hauser Eric | Antenna system for radio receiving sets |
US2538525A (en) * | 1947-06-10 | 1951-01-16 | Rca Corp | Metal-case portable receiver |
DE1090140B (en) * | 1957-06-26 | 1960-09-29 | Autophon Ag | Portable one-antenna pager for paging systems |
US3104364A (en) * | 1957-05-07 | 1963-09-17 | Porter Co Inc H K | Magnetic core construction |
US3153214A (en) * | 1962-04-26 | 1964-10-13 | Westinghouse Electric Corp | Wound magnetic core structure for inductive apparatus |
US3271718A (en) * | 1962-08-06 | 1966-09-06 | Tyco Laboratories Inc | Magnetic cores for electrical devices and method of manufacture |
US3372395A (en) * | 1963-11-13 | 1968-03-05 | Gen Electric | Vlf antenna |
US3538441A (en) * | 1966-02-24 | 1970-11-03 | Matsushita Electric Ind Co Ltd | Antenna having a receiver therein |
-
1971
- 1971-04-27 US US00137998A patent/US3778836A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1550889A (en) * | 1924-09-15 | 1925-08-25 | James A Doran | Induction device and magnetic circuits for the same |
US2256803A (en) * | 1939-08-17 | 1941-09-23 | Hauser Eric | Antenna system for radio receiving sets |
US2538525A (en) * | 1947-06-10 | 1951-01-16 | Rca Corp | Metal-case portable receiver |
US3104364A (en) * | 1957-05-07 | 1963-09-17 | Porter Co Inc H K | Magnetic core construction |
DE1090140B (en) * | 1957-06-26 | 1960-09-29 | Autophon Ag | Portable one-antenna pager for paging systems |
US3153214A (en) * | 1962-04-26 | 1964-10-13 | Westinghouse Electric Corp | Wound magnetic core structure for inductive apparatus |
US3271718A (en) * | 1962-08-06 | 1966-09-06 | Tyco Laboratories Inc | Magnetic cores for electrical devices and method of manufacture |
US3372395A (en) * | 1963-11-13 | 1968-03-05 | Gen Electric | Vlf antenna |
US3538441A (en) * | 1966-02-24 | 1970-11-03 | Matsushita Electric Ind Co Ltd | Antenna having a receiver therein |
Non-Patent Citations (3)
Title |
---|
Burgess, R. E., Iron Cored Loop Receiving Aerial Wireless Engineer, 6 1946, pp. 172 178. * |
Polydoroff, W. J., High Frequency Magnetic Materials John Wiley & Sons, 1960, pp. 1 3. * |
Polydoroff, W. J., R.E.E. Ferromagnetic Loop Antennas , Radio Electronic Eng. Edition of Radio & TV News, 11 1951, pp. 11 13, 24. * |
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4004228A (en) * | 1974-04-29 | 1977-01-18 | Integrated Electronics, Ltd. | Portable transmitter |
US4123756A (en) * | 1976-09-24 | 1978-10-31 | Nippon Electric Co., Ltd. | Built-in miniature radio antenna |
FR2528644A1 (en) * | 1982-06-10 | 1983-12-16 | Sensormatic Electronics Corp | FLOW GUIDING WINDING ASSEMBLY, IN PARTICULAR FOR A COMMUNICATION DEVICE |
US4679233A (en) * | 1985-08-30 | 1987-07-07 | Motorola, Inc. | Microphone |
US4740794A (en) * | 1986-01-03 | 1988-04-26 | Motorola, Inc. | Connectorless antenna coupler |
EP0382130A2 (en) * | 1989-02-10 | 1990-08-16 | Junghans Uhren Gmbh | Small radio-controlled clock with an antenna coil |
EP0382130A3 (en) * | 1989-02-10 | 1992-01-15 | Junghans Uhren Gmbh | Small radio-controlled clock with an antenna coil |
EP0630068A1 (en) * | 1993-06-21 | 1994-12-21 | Raytheon Company | Radar system and components therefor for transmitting an electromagnetic signal underwater |
DE19854160A1 (en) * | 1998-11-24 | 2000-06-08 | Koepenick Funkwerk Gmbh | Longwave radio receiver for distance remote-control has ferrite core of ferrite antenna formed as hollow body for acting as Faraday cage for receiver components inserted in its interior |
US6400330B1 (en) * | 2000-06-13 | 2002-06-04 | Aisin Seiki Kabushiki Kaisha | Bar antenna and method of manufacturing the same |
US6965352B2 (en) * | 2003-04-08 | 2005-11-15 | Matsushita Electric Industrial Co., Ltd. | Antenna device for vehicles and vehicle antenna system and communication system using the antenna device |
US20040201536A1 (en) * | 2003-04-08 | 2004-10-14 | Masahiro Ohara | Antenna device for vehicles and vehicle antenna system and communication system using the antenna device |
US7167140B2 (en) | 2003-07-02 | 2007-01-23 | Nec Tokin Corporation | Coil antenna |
US20080088516A1 (en) * | 2004-02-27 | 2008-04-17 | Michelin Recherche Et Technique S.A. | Transmission And/Or Reception Device Which Is Intended To Be Mounted To A Vehicle Wheel And A Housing For One Such Device |
WO2005086282A1 (en) * | 2004-02-27 | 2005-09-15 | Societe De Technologie Michelin | Transmission and/or reception device which is intended to be mounted to a vehicle wheel and a housing for one such device |
US7679570B2 (en) | 2004-02-27 | 2010-03-16 | Michelin Recherche Et Technique S.A. | Transmission and/or reception device which is intended to be mounted to a vehicle wheel and a housing for one such device |
US20050237254A1 (en) * | 2004-04-27 | 2005-10-27 | Nec Tokin Corporation | Coil antenna |
EP1592085A1 (en) * | 2004-04-27 | 2005-11-02 | Nec Tokin Corporation | Coil Antenna |
US7030828B2 (en) | 2004-04-27 | 2006-04-18 | Nec Tokin Corporation | Coil antenna |
US20060195036A1 (en) * | 2005-02-25 | 2006-08-31 | Hisao Nakamura | Heartbeat measuring device |
US7425929B2 (en) * | 2005-08-04 | 2008-09-16 | Murata Manufacturing Co., Ltd. | Coil antenna |
US20070091007A1 (en) * | 2005-08-04 | 2007-04-26 | Murata Manufacturing Co., Ltd. | Coil antenna |
US9172134B2 (en) | 2008-11-06 | 2015-10-27 | Antenna79, Inc. | Protective cover for a wireless device |
US9287915B2 (en) | 2008-11-06 | 2016-03-15 | Antenna79, Inc. | Radiation redirecting elements for portable communication device |
US9350410B2 (en) | 2008-11-06 | 2016-05-24 | Antenna79, Inc. | Protective cover for a wireless device |
US9472841B2 (en) | 2008-11-06 | 2016-10-18 | Antenna79, Inc. | RF radiation redirection away from portable communication device user |
US20140057686A1 (en) * | 2011-11-02 | 2014-02-27 | Pong Research Corporation | Protective cover for a wireless device |
US9838060B2 (en) * | 2011-11-02 | 2017-12-05 | Antenna79, Inc. | Protective cover for a wireless device |
US9065169B2 (en) | 2013-06-25 | 2015-06-23 | University Of New Hampshire | High frequency magnetic field antenna |
US20160093953A1 (en) * | 2014-09-30 | 2016-03-31 | Fujitsu Limited | Frequency characteristic adjusting jig, antenna testing apparatus and antenna testing method, and loop antenna |
US9614284B2 (en) * | 2014-09-30 | 2017-04-04 | Fujitsu Limited | Frequency characteristic adjusting jig, antenna testing apparatus and antenna testing method, and loop antenna |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3778836A (en) | Magnetic antenna having a block or circuit components therein | |
JP3160685B2 (en) | Inductor | |
US3603902A (en) | Miniature broad band low pass filters with multiturn tape wound inductors | |
US6919788B2 (en) | Low profile high current multiple gap inductor assembly | |
US10079089B1 (en) | Coil electronic component and board having the same | |
CA2645771C (en) | Inductive device including permanent magnet and associated methods | |
GB2044550A (en) | Case inductive circuit components | |
US6353375B2 (en) | Magnetostatic wave device | |
CN111986896B (en) | Coil component | |
US11688541B2 (en) | Integrated magnetic component | |
US2981950A (en) | Electrostatically-shielded loop antenna | |
JP2004319985A (en) | Transformer or inductor (namely "transductor") and antenna manufactured from conductive filler-charged resin-based material | |
US3336662A (en) | Shielding a magnetic core | |
US11569024B2 (en) | Coil component | |
JPS60233904A (en) | Antenna system | |
US3538441A (en) | Antenna having a receiver therein | |
JP2005260073A (en) | Inductance element and its manufacturing method | |
US3824515A (en) | Screening cage | |
JP3340146B2 (en) | Magnetic shield type inductance element | |
JPH08264343A (en) | Chip common mode choke and its manufacture | |
US20230402222A1 (en) | Coil device | |
EP0005801A1 (en) | Microwave ferrite component | |
Haspers | Ferrites: Their properties and applications | |
JPH06267746A (en) | Noise eliminating element | |
JPH07220948A (en) | Chip inductance part and its manufacturing method |