US2248787A - High frequency apparatus - Google Patents
High frequency apparatus Download PDFInfo
- Publication number
- US2248787A US2248787A US242913A US24291338A US2248787A US 2248787 A US2248787 A US 2248787A US 242913 A US242913 A US 242913A US 24291338 A US24291338 A US 24291338A US 2248787 A US2248787 A US 2248787A
- Authority
- US
- United States
- Prior art keywords
- screening
- stages
- walls
- high frequency
- box
- 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
- 238000012216 screening Methods 0.000 description 17
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000003534 oscillatory effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
Images
Classifications
-
- 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
- H05K9/0064—Earth or grounding circuit
Definitions
- the invention relates to high frequency apparatus, especially transmitters and receivers. More particularly the invention is concerned with apparatus operating on Very short waves, namely waves of the order of magnitude of a few meters or still shorter.
- the invention proposes to avoid a direct electric interconnection of these screening walls and the screening box by interposing capacities therebetween.
- These capacities and the inductance of the intermediate screening walls constitute a se- 7 ries circuit the impedance of which is variable by calculating the capacities accordingly and may thus be given a desired value. For instance, the series circuit if tuned to a predetermined frequency forms a short circuit, mutual coupling between the individual stages then not being possible.
- Fig 1 is a diagrammatic and partially perspective View of one embodiment of the invention, while Fig. 2 shows a sectional diagram that serves to explain the function of this embodiment.
- a metallic screening box I, Fig. 1 contains two tube stages 2, 3.
- the circuit arrangement of these stages is not completely represented, being immaterial to the invention. Only the oscillatory circuit inductances or coupling inductances 4, 5, 6, "I, 8 are diagrammatically indicated.
- a metallic wall 9 is disposed between them. This wall is along its edge I0 electrically connected with box I while the opposite edge thereof is joined thereto through capacities II, I2, I3.
- Fig. 2 the walls of screening box I and the wall 9 are represented as inductances. This wall is at I0 electrically connected with one wall of the box I, While the opposite or upper edge there- ⁇ of is through condenser II joined to the upper wall of box 'I. If condenser II were not provided then the two cases into which box I is subdivided by wall 9 would be magnetically coupled to each other by the inductance of wall 9, whereby voltages would be able to pass from one circuit into the other. By varying condenser II such undesired coupling may be altered, assuming the zero value in the case of resonance, for instance.
- the invention is applicable to apparatus comprising any number of tube stages and accordingly any number of screening walls of the kind here represented by wall 9.
- the novel arrangement is of special advantage e if employed in high frequency transmitters, is
- High frequency apparatus comprising a metallic screening box, a number of tube stages contained in said box, said stages having a predetermined voperating frequency, metallic screening walls between said stages and capacities interconnecting said screening box and said screening walls, each of said walls and its associated capacity together forming a series resonant circuit at the predetermined operating frequency.
Description
July 8, 1941- M. scHRuMP'F HIGH FREQUENCQ APPARATUS Filed Nov. 29, 1938 l-'IA .1.
INVENTOR MAX SC/RUMPF ATTORNEY Patented July 8, 1941 HIGH FREQUENCY APPARATUS Max Schrumpf, Berlin, Germany, assigner to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof,
Germany, a company Application November 29, 1938, Serial No. 242,913 In Germany November 9, 1938 (Cl. Z50-16) 1 Claim.
The invention relates to high frequency apparatus, especially transmitters and receivers. More particularly the invention is concerned with apparatus operating on Very short waves, namely waves of the order of magnitude of a few meters or still shorter.
In connection with apparatus of this kind it is customary to dispose the entire arrangement, which comprises amplifying stages or oscillator stages, in a metallic screening box and to provide metallic screening walls between these stages. This however in the case 0f the said short waves entails the drawback that the walls of the screening box and these intermediate screening walls constitute circuits in which the inductance of such intermediate walls acts as a coupling member between the respective circuits. If in the screening case of a stage the oscillatory circuit voltages are induced, then the induced voltage will be effective in the other screening cases through the inductance of the intermediate screening walls. The individual stages are therefore not electrically independent of each other but are coupled to one another.
In order to overcome this disadvantage the invention proposes to avoid a direct electric interconnection of these screening walls and the screening box by interposing capacities therebetween. These capacities and the inductance of the intermediate screening walls constitute a se- 7 ries circuit the impedance of which is variable by calculating the capacities accordingly and may thus be given a desired value. For instance, the series circuit if tuned to a predetermined frequency forms a short circuit, mutual coupling between the individual stages then not being possible.
In the accompanying drawing Fig 1 is a diagrammatic and partially perspective View of one embodiment of the invention, while Fig. 2 shows a sectional diagram that serves to explain the function of this embodiment.
.A metallic screening box I, Fig. 1, contains two tube stages 2, 3. The circuit arrangement of these stages is not completely represented, being immaterial to the invention. Only the oscillatory circuit inductances or coupling inductances 4, 5, 6, "I, 8 are diagrammatically indicated. In order to prevent the stages 2, 3 from influencing one another a metallic wall 9 is disposed between them. This wall is along its edge I0 electrically connected with box I while the opposite edge thereof is joined thereto through capacities II, I2, I3.
In Fig. 2 the walls of screening box I and the wall 9 are represented as inductances. This wall is at I0 electrically connected with one wall of the box I, While the opposite or upper edge there-` of is through condenser II joined to the upper wall of box 'I. If condenser II were not provided then the two cases into which box I is subdivided by wall 9 would be magnetically coupled to each other by the inductance of wall 9, whereby voltages would be able to pass from one circuit into the other. By varying condenser II such undesired coupling may be altered, assuming the zero value in the case of resonance, for instance.
The invention is applicable to apparatus comprising any number of tube stages and accordingly any number of screening walls of the kind here represented by wall 9.
The novel arrangement is of special advantage e if employed in high frequency transmitters, is
however intended also for use in connection with receivers.
What is claimed is:
High frequency apparatus comprising a metallic screening box, a number of tube stages contained in said box, said stages having a predetermined voperating frequency, metallic screening walls between said stages and capacities interconnecting said screening box and said screening walls, each of said walls and its associated capacity together forming a series resonant circuit at the predetermined operating frequency.
MAX SCHRUMPF.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2248787X | 1938-11-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2248787A true US2248787A (en) | 1941-07-08 |
Family
ID=7992267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US242913A Expired - Lifetime US2248787A (en) | 1938-11-09 | 1938-11-29 | High frequency apparatus |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2248787A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2554087A (en) * | 1947-02-26 | 1951-05-22 | Hartford Nat Bank & Trust Co | High-frequency oscillator with a back-coupled electron tube |
| US2696554A (en) * | 1945-10-16 | 1954-12-07 | Andrew V Haeff | Microwave signal generator |
| US2799008A (en) * | 1956-04-30 | 1957-07-09 | Rca Corp | Signal coupling system |
| US4901043A (en) * | 1987-07-02 | 1990-02-13 | Andrew F. Tresness | Compact filter having a multi-compartment housing |
-
1938
- 1938-11-29 US US242913A patent/US2248787A/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2696554A (en) * | 1945-10-16 | 1954-12-07 | Andrew V Haeff | Microwave signal generator |
| US2554087A (en) * | 1947-02-26 | 1951-05-22 | Hartford Nat Bank & Trust Co | High-frequency oscillator with a back-coupled electron tube |
| US2799008A (en) * | 1956-04-30 | 1957-07-09 | Rca Corp | Signal coupling system |
| US4901043A (en) * | 1987-07-02 | 1990-02-13 | Andrew F. Tresness | Compact filter having a multi-compartment housing |
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