US1994905A - Shielded electric system - Google Patents
Shielded electric system Download PDFInfo
- Publication number
- US1994905A US1994905A US632030A US63203032A US1994905A US 1994905 A US1994905 A US 1994905A US 632030 A US632030 A US 632030A US 63203032 A US63203032 A US 63203032A US 1994905 A US1994905 A US 1994905A
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- US
- United States
- Prior art keywords
- frequency
- shield
- conductors
- shielded
- electric system
- 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
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-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0018—Casings with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables
Definitions
- the present invention relates to electric systems, particularly high-frequency systems, and to shields therefor.
- An object of the present invention is to overcome this difiicuty of loss of energy from shielded, high-frequency apparatus along low-frequency, or direct-current, control leads to the shielded apparatus.
- a further object is to provide a new and improved isolating means for electric systems.
- Still another object is to provide a new and improved means for preventing the transfer of high-frequency energy from one point to another.
- a further object is to prevent the carrying of energy from within a shielded container, containing high-frequency apparatus, to the external or surrounding state.
- a shielded container 1 which may be of copper, containing high-frequency apparatus, is shown associated with a battery source 11. It is, of course, understood that this source 11 might also be a low-frequency oscillator, or other control means.
- the low-frequency energy is led into the shielded container 1 by means of conductors 7 and 9, embedded, side by side, so as to be insulated from each other, in an insulated coating 5, shielded by a metallic conductor 3, which may be in the form of braid or solid tubing.
- the conducting shield 3 and the conductors 7 and 9 contained therein are in coiled form, so as to act as a choke coil.
- the convolutions of the conducting shield 3 are insulated from one another by air,
- An electric system having, in combination, an alternating-current circuit, a conductor connected with the circuit, and a shield in which the conductor is disposed, the conductor and the shield being coiled as a unit, the frequency of the alternating current of the circuit being such that the said coiled unit provides sufliciently high impedance at the said frequency substantially to prevent the passage of energy at the said frequency from the said circuit through the said shield of the said coiled unit.
- An electric system having, in combination, an alternating-current circuit, a plurality of conductors connected with the circuit, the conductors being insulated from each other, and a shield in which the conductors are disposed, the conductors and the shield being coiled as a unit, the frequency of the alternating current of the circuit being such that the said coiled unit provides sufliciently high impedance at the said frequency substantially to prevent the passage of energy at the said frequency from the said circuit through the said shield of the said coiled unit.
- An electric system having, in combination, an electrically shielding surface, a high-frequency circuit on one side of the surface, a conductor connected with the high-frequency circuit and extending through the surface, and a shield in which the conductor is disposed, the shield extending to the surface, the conductor and the shield being in coiled form to constitute a choke coil and the convolutions of the coiled shield being insulated from one another.
- An electric system having, in combination, an electrically shielded container, a high-frequency system contained in the container, a plurality of conductors connected with the highfrequency system and extending into the con tainer, the conductors being insulated from each other, and a shield in which the conductors are disposed, the shield extending to the container, the conductors and the shield being in coiled form to constitute a choke coil and the convolutions of the coiled shield being insulated from one another.
Description
March 19, 1935. 9 L, BQWLES SHIELDED ELECTRIC SYSTEM Filed Sept. 7, 1932 I71 venffor E dwa/rd Z. flowes attorney y Mwm Patented Mar. 19, 1935 UNI-TED STATES PATENT OFFICE 4 Claims.
The present invention relates to electric systems, particularly high-frequency systems, and to shields therefor.
It has long been known that it is very difficult to supply low-frequency energy, or direct current, to a high-frequency device, without having some of the high-frequency energy output fed down the leads, and out into space, in spite of the fact that the entire high-frequency system is shielded electrically. In the case of a shortwave, radio-frequency oscillator, for example, considerable high-frequency energy can be propagated from the oscillator along the wires from the battery, or from the low-frequency alternator, and out into space, even though these wires may be shielded by means of metal braid which, in turn, is connected to the main shield of the apparatus.
An object of the present invention is to overcome this difiicuty of loss of energy from shielded, high-frequency apparatus along low-frequency, or direct-current, control leads to the shielded apparatus.
A further object is to provide a new and improved isolating means for electric systems.
Still another object is to provide a new and improved means for preventing the transfer of high-frequency energy from one point to another.
A further object is to prevent the carrying of energy from within a shielded container, containing high-frequency apparatus, to the external or surrounding state.
Other objects will be explained hereinafter and will be particularly pointed out in the appended claims.
The invention will now be explained in connection with the accompanying drawing, the single figure of which is a perspective, diagrammatic view of circuits and apparatus arranged and constructed according to a preferred embodiment of the invention.
A shielded container 1, which may be of copper, containing high-frequency apparatus, is shown associated with a battery source 11. It is, of course, understood that this source 11 might also be a low-frequency oscillator, or other control means. The low-frequency energy is led into the shielded container 1 by means of conductors 7 and 9, embedded, side by side, so as to be insulated from each other, in an insulated coating 5, shielded by a metallic conductor 3, which may be in the form of braid or solid tubing. The conducting shield 3 and the conductors 7 and 9 contained therein are in coiled form, so as to act as a choke coil. The convolutions of the conducting shield 3 are insulated from one another by air,
as shown.
By this simple expedient, it is possible to reduce, to practically any degree desired, the high-frequency energy leaving the shielded container 1 along the supply conductors 7 and 9.
Modifications will obviously occur to persons skilled in the art, and all such are considered to fall within the spirit and scope of the invention, as defined in the appended claims.
What is claimed is:
1. An electric system having, in combination, an alternating-current circuit, a conductor connected with the circuit, and a shield in which the conductor is disposed, the conductor and the shield being coiled as a unit, the frequency of the alternating current of the circuit being such that the said coiled unit provides sufliciently high impedance at the said frequency substantially to prevent the passage of energy at the said frequency from the said circuit through the said shield of the said coiled unit.
2. An electric system having, in combination, an alternating-current circuit, a plurality of conductors connected with the circuit, the conductors being insulated from each other, and a shield in which the conductors are disposed, the conductors and the shield being coiled as a unit, the frequency of the alternating current of the circuit being such that the said coiled unit provides sufliciently high impedance at the said frequency substantially to prevent the passage of energy at the said frequency from the said circuit through the said shield of the said coiled unit.
3. An electric system having, in combination, an electrically shielding surface, a high-frequency circuit on one side of the surface, a conductor connected with the high-frequency circuit and extending through the surface, and a shield in which the conductor is disposed, the shield extending to the surface, the conductor and the shield being in coiled form to constitute a choke coil and the convolutions of the coiled shield being insulated from one another.
4. An electric system having, in combination, an electrically shielded container, a high-frequency system contained in the container, a plurality of conductors connected with the highfrequency system and extending into the con tainer, the conductors being insulated from each other, and a shield in which the conductors are disposed, the shield extending to the container, the conductors and the shield being in coiled form to constitute a choke coil and the convolutions of the coiled shield being insulated from one another.
EDWARD LINDLEY BOWLES.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US632030A US1994905A (en) | 1932-09-07 | 1932-09-07 | Shielded electric system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US632030A US1994905A (en) | 1932-09-07 | 1932-09-07 | Shielded electric system |
Publications (1)
Publication Number | Publication Date |
---|---|
US1994905A true US1994905A (en) | 1935-03-19 |
Family
ID=24533779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US632030A Expired - Lifetime US1994905A (en) | 1932-09-07 | 1932-09-07 | Shielded electric system |
Country Status (1)
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419907A (en) * | 1940-09-27 | 1947-04-29 | Siemens Brothers & Co Ltd | Means for reducing impedance effects in grounded communication circuits |
US2490329A (en) * | 1944-02-01 | 1949-12-06 | Curtiss Wright Corp | Suppression of radio-frequency noise voltages |
US3283311A (en) * | 1961-11-01 | 1966-11-01 | Sperry Rand Corp | Magnetic element read-out utilizing transmission line sensing circuit |
US4338576A (en) * | 1978-07-26 | 1982-07-06 | Tdk Electronics Co., Ltd. | Ultrasonic atomizer unit utilizing shielded and grounded elements |
FR2585896A1 (en) * | 1985-08-02 | 1987-02-06 | Thomson Csf | DEVICE FOR CONNECTING BETWEEN FARADAY-TYPE CAGE ENCLOSURES |
FR2604594A1 (en) * | 1986-09-25 | 1988-04-01 | Siepel | DEVICE FOR SUPPLYING ELECTRICITY TO DEVICES PLACED WITHIN A FARADAY CAGE |
US4751479A (en) * | 1985-09-18 | 1988-06-14 | Smiths Industries Public Limited Company | Reducing electromagnetic interference |
US6404297B2 (en) * | 1999-07-15 | 2002-06-11 | Hewlett-Packard Company | Electromagnetic interference blocking power bus bar |
-
1932
- 1932-09-07 US US632030A patent/US1994905A/en not_active Expired - Lifetime
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419907A (en) * | 1940-09-27 | 1947-04-29 | Siemens Brothers & Co Ltd | Means for reducing impedance effects in grounded communication circuits |
US2490329A (en) * | 1944-02-01 | 1949-12-06 | Curtiss Wright Corp | Suppression of radio-frequency noise voltages |
US3283311A (en) * | 1961-11-01 | 1966-11-01 | Sperry Rand Corp | Magnetic element read-out utilizing transmission line sensing circuit |
US4338576A (en) * | 1978-07-26 | 1982-07-06 | Tdk Electronics Co., Ltd. | Ultrasonic atomizer unit utilizing shielded and grounded elements |
FR2585896A1 (en) * | 1985-08-02 | 1987-02-06 | Thomson Csf | DEVICE FOR CONNECTING BETWEEN FARADAY-TYPE CAGE ENCLOSURES |
EP0214886A1 (en) * | 1985-08-02 | 1987-03-18 | Thomson-Csf | Connecting device between Faraday cage-type housings |
US4751479A (en) * | 1985-09-18 | 1988-06-14 | Smiths Industries Public Limited Company | Reducing electromagnetic interference |
FR2604594A1 (en) * | 1986-09-25 | 1988-04-01 | Siepel | DEVICE FOR SUPPLYING ELECTRICITY TO DEVICES PLACED WITHIN A FARADAY CAGE |
EP0263010A1 (en) * | 1986-09-25 | 1988-04-06 | SIEPEL - Société Industrielle d'Etudes et Protection Electronique | Device for feeding electrical apparatuses placed inside a Faraday cage |
US4749895A (en) * | 1986-09-25 | 1988-06-07 | SIEPEL-Societe Industrielle de'Etudes et Protection Electronique | Device for feeding electricity to apparatus placed inside a Faraday cage |
US6404297B2 (en) * | 1999-07-15 | 2002-06-11 | Hewlett-Packard Company | Electromagnetic interference blocking power bus bar |
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