US2475829A - High-frequency inductive coupling - Google Patents

High-frequency inductive coupling Download PDF

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Publication number
US2475829A
US2475829A US684087A US68408746A US2475829A US 2475829 A US2475829 A US 2475829A US 684087 A US684087 A US 684087A US 68408746 A US68408746 A US 68408746A US 2475829 A US2475829 A US 2475829A
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Prior art keywords
coils
cylinder
inductive coupling
frequency inductive
groove
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Expired - Lifetime
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US684087A
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Fennema Pieter Harm
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core

Definitions

  • This invention relates to a combination of at least two coils arranged in a cylinder.
  • This invention relates to a combination of at least two coils arranged in a cylinder.
  • the two coils wound on frames are arranged inside the cylinder and in which the portion of the cylinder at the height of the middle between these coils comprised a depressed groove.
  • This groove constitutes somewhat of a diaphragm whereby the field coupling the coils could be reduced. It has been found that the possibility of adjustment in this construction is too small.
  • the coils are mounted displaceably within the shield can or the can consists of two parts, one of which slides with respect to the other, each part carrying one of the coils.
  • This type of construction is relatively complicated and expensive.
  • the object of this invention is to provide a simple and inexpensive coil system in which ample control oi the coupling between coils is provided by'varying the distance between the coils.
  • two coils are each secured at a different location on the wall of a cylinder with the wall separating the coils easily deformable in order to alter the distance between the cells.
  • a metal cylinder 1 In the vicinity of the ends of a metal cylinder 1 are arranged two dish-shaped insulating rings 2 which are, for example, of artificial resin.
  • the cylinder comprises two grooves 4 in the vicinity of the adjacent edges of the insulating rings, whereas at the other side of the dish-shaped rings the cylinder is flanged in 5. These rings are thus firmly secured in the cylinder.
  • Two little tubes 6, for example of pertinax, are clamped in the dish-shaped rings.
  • the coils l are wound on these little tubes, while little rods 8 of high-frequency iron are fastened in the said tubes by means of a small quantity of compound indicated by '9;
  • the lower dish-shaped ring 2 comprises a projecting part II) which is provided with screwthread and carries a nut ll pressed from sheet metal. With the aid of these parts the combination is fastened on a chassis-plate l2.
  • the distance between the two coils is determined by the shape of the cylinder between these coils.
  • This portion of the cylinder comprises not only grooves 4, by means of which the .coils are fastened, but also a third groove IS. The latter is provided when the combination is completed.
  • the groove may also be provided preliminarily in the cylinder and the electrical properties may be changed afterwards by depressing or extending the cylinder.
  • the cylinder could comprise a certain number of apertures l4, placed in a circle, in such manner that the two halves are connected by means of a certain number of narrow metal strips 15 and can be displaced relatively to each other by deforming these strips.
  • apertures are provided, however, it will generally be necessary to provide an additional shield.
  • a coil system comprising a hollow cylindrical member, a plurality of coil members each secured to a separate portion of the inner wall of said cylindrical member, and an easily permanently deformable integral wall portion of said cylindrical member separating each of said coil members for altering the distance between the said coil members.
  • a coil system comprising a hollow cylindrical member, a plurality of coil members each secured to a separation portion of the inner wall of said cylindrical member, and an easily permanently deformable integral wall portion of said cylindrical member provided with an annular groove separating each of said coil members for altering the distance between the said coil members.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

July 12, 1949. 59,, H FE 2,475,829
HIGH-FREQUENCY INDUGTIVE COUPLING Filed July 16, 1946 Patented July 12, 1949 2,475,829 HIGH-FREQUENCY INDUCTIVE COUPLING Pieter Harm Fennema, Eindhoven, Netherlands, assignor to Hartford National Bank and Trust Company,
Application July Hartford, Conn, as trustee 16, 1946, Serial No. 684,087
In the Netherlands January 28, 1943 Section 1, Public Law .690, August 8, 1946 Patent expires January 28, 1963 3 Claims. (Cl. 171-119) This invention relates to a combination of at least two coils arranged in a cylinder. When such combinations are manufactured in large quantities, it is in most cases necessary for the properties of the combinations to be made exactly equal to one another. In order to be able to adjust the relative inductance of these coils, a construction was previously suggested in which the two coils wound on frames are arranged inside the cylinder and in which the portion of the cylinder at the height of the middle between these coils comprised a depressed groove. This groove constitutes somewhat of a diaphragm whereby the field coupling the coils could be reduced. It has been found that the possibility of adjustment in this construction is too small.
In another known construction the coils are mounted displaceably within the shield can or the can consists of two parts, one of which slides with respect to the other, each part carrying one of the coils. This type of construction is relatively complicated and expensive.
The object of this invention is to provide a simple and inexpensive coil system in which ample control oi the coupling between coils is provided by'varying the distance between the coils.
According to the invention two coils are each secured at a different location on the wall of a cylinder with the wall separating the coils easily deformable in order to alter the distance between the cells.
The invention will be explained more fully by reference to the accompanying drawing showing, by way of example, a section of a combination according to the invention. a
In the vicinity of the ends of a metal cylinder 1 are arranged two dish-shaped insulating rings 2 which are, for example, of artificial resin. The cylinder comprises two grooves 4 in the vicinity of the adjacent edges of the insulating rings, whereas at the other side of the dish-shaped rings the cylinder is flanged in 5. These rings are thus firmly secured in the cylinder. Two little tubes 6, for example of pertinax, are clamped in the dish-shaped rings. The coils l are wound on these little tubes, while little rods 8 of high-frequency iron are fastened in the said tubes by means of a small quantity of compound indicated by '9; The lower dish-shaped ring 2 comprises a projecting part II) which is provided with screwthread and carries a nut ll pressed from sheet metal. With the aid of these parts the combination is fastened on a chassis-plate l2. As can be seen from the drawing, the distance between the two coils is determined by the shape of the cylinder between these coils. This portion of the cylinder comprises not only grooves 4, by means of which the .coils are fastened, but also a third groove IS. The latter is provided when the combination is completed. To this end it is placed on a device which is constituted by a combination of a lathe by means of which the groove may be provided and a measuring device by means of which the electrical properties of the combination may be ascertained. During the depression of groove l3, the changes in the electrical properties of the coils may thus be followed.
The groove may also be provided preliminarily in the cylinder and the electrical properties may be changed afterwards by depressing or extending the cylinder.
It is evident that methods of deformation of the cylinder other than by means of a depressed groove are also possible. The cylinder could comprise a certain number of apertures l4, placed in a circle, in such manner that the two halves are connected by means of a certain number of narrow metal strips 15 and can be displaced relatively to each other by deforming these strips. When such apertures are provided, however, it will generally be necessary to provide an additional shield.
What I claim is: 1. A coil system comprising a hollow cylindrical member, a plurality of coil members each secured to a separate portion of the inner wall of said cylindrical member, and an easily permanently deformable integral wall portion of said cylindrical member separating each of said coil members for altering the distance between the said coil members.
2. A coil system comprising a hollow cylindrical member, a plurality of coil members each secured to a separation portion of the inner wall of said cylindrical member, and an easily permanently deformable integral wall portion of said cylindrical member provided with an annular groove separating each of said coil members for altering the distance between the said coil members.
PIETER HARM FENNEMA.
anrmancns crrnn The following references are of record in the file of this patent:
5 UNITED STATES PATENTS Number Name Date 2,914,820 Snider Sept. 17, 1935 R0 FOREIGN PATENTS Number Country Date 139,211 Great Britain Sept. 23, 1920
US684087A 1943-01-28 1946-07-16 High-frequency inductive coupling Expired - Lifetime US2475829A (en)

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NL2475829X 1943-01-28

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850709A (en) * 1954-04-28 1958-09-02 Int Standard Electric Corp High frequency electric transformers
US2958930A (en) * 1956-06-12 1960-11-08 Jr Vincent M Heazel Receiver input transformer and method of making the same
US3662306A (en) * 1971-03-24 1972-05-09 Gen Instrument Corp Adjustably coupled radio frequency transformer
US4523147A (en) * 1981-07-31 1985-06-11 Consiglio Nazionale Delle Ricerche Fine balancing second derivative gradiometer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB139211A (en) * 1918-07-01 1920-09-23 Siemens Ag Improvements in pressure gauges
US2014820A (en) * 1932-09-23 1935-09-17 Rca Corp Variometer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB139211A (en) * 1918-07-01 1920-09-23 Siemens Ag Improvements in pressure gauges
US2014820A (en) * 1932-09-23 1935-09-17 Rca Corp Variometer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850709A (en) * 1954-04-28 1958-09-02 Int Standard Electric Corp High frequency electric transformers
US2958930A (en) * 1956-06-12 1960-11-08 Jr Vincent M Heazel Receiver input transformer and method of making the same
US3662306A (en) * 1971-03-24 1972-05-09 Gen Instrument Corp Adjustably coupled radio frequency transformer
US4523147A (en) * 1981-07-31 1985-06-11 Consiglio Nazionale Delle Ricerche Fine balancing second derivative gradiometer

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