US2419855A - Arrangement adapted to suppress radio frequency currents on conductors - Google Patents
Arrangement adapted to suppress radio frequency currents on conductors Download PDFInfo
- Publication number
- US2419855A US2419855A US361564A US36156440A US2419855A US 2419855 A US2419855 A US 2419855A US 361564 A US361564 A US 361564A US 36156440 A US36156440 A US 36156440A US 2419855 A US2419855 A US 2419855A
- Authority
- US
- United States
- Prior art keywords
- radio frequency
- conductors
- frequency currents
- arrangement adapted
- suppress radio
- 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
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
Definitions
- This invention relates to means to suppress the flow of radio frequency currents On conductors, especially of the so-called shell waves on the outer surface of cable shielding.
- the conductor which is to be rid of radio frequency waves is built up of portions of dissimilar characteristic impedance, preferably of M4 length rather than by the aid of a short-circuit or rejector system, with the result that the radio frequency waves are gradually attenuated completely as a result of reflections produced at the points of discontinuity of the characteristic impedance.
- outer sheath is composed of several pieces or portions A1, B1, A2, B2 of dissimilar wall thickness, and each of these possesses different characteristic impedance values.
- the length of these components is preferably equal to M4.
- the invention is not confined to the suppression of shell waves, in fact, it may generally be used for the purpose Of suppressing radio frequency waves along conductors. If the length of the component parts is not made equal to M4, then the calculation is somewhat more complicated. However, the attenuation of shell waves also in this instance is practicable in the same Way as above described.
- An arrangement for suppressing the flow of energy along the outer conductor of a concentric transmission line in which said outer conductor is divided into sections of different outside diameters such that the surge impedance of each section differs from that of adjacent sections, each having a length equal to an odd multiple of a quarter of the operating wavelength, the relationship between the impedances of adjacent sections being such as to cause a large reflection of energy at each junction between sections.
Landscapes
- Aerials With Secondary Devices (AREA)
Description
APT!I 1947. 1-1.0. ROOSENSTEIN 2,419,855
ARRANGEMENT ADAPTED To SUPPRESS RADIO FREQUENCY CURRENTS ON CONDUCTORS Filed Oct. 17, 1940 INVENTOR IMMS 0. RL?N$TEIN ATTORNEY Patented Apr. 29, 1947 ARRANGEMENT ADAPTED TO SUPPRESS RADIO FREQUENCY CURRENTS N CON- DUCTORS Hans Otto Roosenstein,
in the Attorney Gener Berlin, Germany; vested al of the United States Application October 17, 1940, Serial No. 361,564 In Germany June 22, 1939 3 Claims.
This invention relates to means to suppress the flow of radio frequency currents On conductors, especially of the so-called shell waves on the outer surface of cable shielding. Contradistinct to prior practice, according to this invention, to the said end, the conductor which is to be rid of radio frequency waves is built up of portions of dissimilar characteristic impedance, preferably of M4 length rather than by the aid of a short-circuit or rejector system, with the result that the radio frequency waves are gradually attenuated completely as a result of reflections produced at the points of discontinuity of the characteristic impedance. The general and broad principle underlying the invention shall now be explained in greater detail by reference to the appended drawing as applied to the feeding of an antenna S by way of a shielded line or cable L. If the outer shell of the line were simply free-ended, this outer surface, in the light of experience, would become excited; in other words, so-called shell waves would arise and these would exercise a harmful effect upon the antenna radiation. In order to avoid the said waves, the
outer sheath is composed of several pieces or portions A1, B1, A2, B2 of dissimilar wall thickness, and each of these possesses different characteristic impedance values. The length of these components is preferably equal to M4. Now,
if the assumption is made that at the juncture of connection points of the cable K itself there still flows a vanishingly small current I, it can be demonstrated that the current at point and the current at point Zn 2 I 4) while the current at point it follows that at point K flows a current equal to one-twenty-seventh that at point 3; in other words, the shell wave has dropped to /27. If, in line with what is being shown in the drawing, there is moreover used an antenna at the base of which only a small current intake is required, in other words, for instance, a 7\/2 antenna, it will be seen that also the shell wave amplitude at the base end of the antenna is extremely small. If the antenna currents at points 0 and a are as 10:1, it follows that the amplitude of the shell waves at point K is /z1o the amplitude at point 3. These shell waves may be taken to be negligible for practical purposes.
The invention is not confined to the suppression of shell waves, in fact, it may generally be used for the purpose Of suppressing radio frequency waves along conductors. If the length of the component parts is not made equal to M4, then the calculation is somewhat more complicated. However, the attenuation of shell waves also in this instance is practicable in the same Way as above described.
I claim:
1. An arrangement for suppressing the flow of radio frequency energy along a conductor in which said conductor is divided into a series of sections, each having a length equal to an odd multiple of a quarter of the operating wavelength, the outside diameter of said sections so varying that the surge impedance of each section so differs from that of adjacent sections that a maximum reflection of energy occurs at each junction between sections.
2. An arrangement for suppressing the flow of energy along the outer conductor of a concentric transmission line in which said outer conductor is divided into sections of different outside diameters such that the surge impedance of each section differs from that of adjacent sections, each having a length equal to an odd multiple of a quarter of the operating wavelength, the relationship between the impedances of adjacent sections being such as to cause a large reflection of energy at each junction between sections.
3. An arrangement for suppressing the flow of radio frequency energy along the outer conductor of a concentric transmission line in which said outer conductor i divided into sections of difierent diameter such that the surge impedance of each section differs from that of adjacent sec- UNITED STATES PATENTS tions whereby reflection of energy occurs at each Number Name Date junction between Sections, each section having a 2 Danenbach t length equal to an odd multiple, including unity, 2205874 Buschbeck Julie 1940 a quarter the length the Wanting Wave- 5 2 131,108 Lindenbladtjj jj Sept. 2'? 193a HANS OTTO ROOSENSTEIN' 1,859,390 Green May 24, 1932 2,236,102 Kolster Mar. 25, 1941 REFERENCES CITED 2,184,729 Bailey Dec, 26, 1939 The following references are of record in the 10 2,127,088 Percival et a1 Aug. 16, 1938 file of this patent: 2,038,240 Schelkunoff Apr. 21, 1936
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2419855X | 1939-06-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2419855A true US2419855A (en) | 1947-04-29 |
Family
ID=7995850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US361564A Expired - Lifetime US2419855A (en) | 1939-06-22 | 1940-10-17 | Arrangement adapted to suppress radio frequency currents on conductors |
Country Status (1)
Country | Link |
---|---|
US (1) | US2419855A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2594854A (en) * | 1945-12-10 | 1952-04-29 | Us Sec War | Aerial cable with external radio signal reflection correction |
US2663847A (en) * | 1950-05-20 | 1953-12-22 | Int Standard Electric Corp | Phase changer |
US2736866A (en) * | 1950-03-27 | 1956-02-28 | Int Standard Electric Corp | Filter for transmission line |
US3411111A (en) * | 1965-11-05 | 1968-11-12 | Army Usa | Mast for loop direction finding system |
US6023201A (en) * | 1996-09-09 | 2000-02-08 | Alcatel Cit | Electrical signal transmission device protected against electromagnetic interference |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1859390A (en) * | 1929-05-23 | 1932-05-24 | American Telephone & Telegraph | Concentric conductor system |
US2038240A (en) * | 1934-11-14 | 1936-04-21 | Bell Telephone Labor Inc | Transmission system |
US2127088A (en) * | 1934-02-15 | 1938-08-16 | Emi Ltd | Feeder and the like for electric currents of high frequency |
US2131108A (en) * | 1936-04-28 | 1938-09-27 | Rca Corp | Short wave communication system |
US2178299A (en) * | 1934-04-27 | 1939-10-31 | Meaf Mach En Apparaten Fab Nv | Conductor line for ultra-short electromagnetic waves |
US2184729A (en) * | 1937-04-15 | 1939-12-26 | Bell Telephone Labor Inc | Antenna system |
US2205874A (en) * | 1936-12-24 | 1940-06-25 | Telefunken Gmbh | Arrangement for matching a high frequency radiator to a transmission line |
US2236102A (en) * | 1938-04-28 | 1941-03-25 | Internat Telephone Dev Co Inc | High frequency wave transmission system |
-
1940
- 1940-10-17 US US361564A patent/US2419855A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1859390A (en) * | 1929-05-23 | 1932-05-24 | American Telephone & Telegraph | Concentric conductor system |
US2127088A (en) * | 1934-02-15 | 1938-08-16 | Emi Ltd | Feeder and the like for electric currents of high frequency |
US2178299A (en) * | 1934-04-27 | 1939-10-31 | Meaf Mach En Apparaten Fab Nv | Conductor line for ultra-short electromagnetic waves |
US2038240A (en) * | 1934-11-14 | 1936-04-21 | Bell Telephone Labor Inc | Transmission system |
US2131108A (en) * | 1936-04-28 | 1938-09-27 | Rca Corp | Short wave communication system |
US2205874A (en) * | 1936-12-24 | 1940-06-25 | Telefunken Gmbh | Arrangement for matching a high frequency radiator to a transmission line |
US2184729A (en) * | 1937-04-15 | 1939-12-26 | Bell Telephone Labor Inc | Antenna system |
US2236102A (en) * | 1938-04-28 | 1941-03-25 | Internat Telephone Dev Co Inc | High frequency wave transmission system |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2594854A (en) * | 1945-12-10 | 1952-04-29 | Us Sec War | Aerial cable with external radio signal reflection correction |
US2736866A (en) * | 1950-03-27 | 1956-02-28 | Int Standard Electric Corp | Filter for transmission line |
US2663847A (en) * | 1950-05-20 | 1953-12-22 | Int Standard Electric Corp | Phase changer |
US3411111A (en) * | 1965-11-05 | 1968-11-12 | Army Usa | Mast for loop direction finding system |
US6023201A (en) * | 1996-09-09 | 2000-02-08 | Alcatel Cit | Electrical signal transmission device protected against electromagnetic interference |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2207845A (en) | Propagation of waves in a wave guide | |
US2530691A (en) | Wave filter | |
US3040278A (en) | Broad-band single-wire transmission line | |
US2155508A (en) | Wave guide impedance element and network | |
GB464185A (en) | High frequency electric wave transmission system | |
DE3369228D1 (en) | Line with divided low-pass filter | |
US2297512A (en) | Arrangement for supressing waves along cable casings | |
US9257955B2 (en) | Common mode noise reduction circuit | |
US2321521A (en) | Frequency band filter | |
US2322971A (en) | Shielded antenna feeder lead or line | |
US2877433A (en) | Coaxial filter | |
US2297513A (en) | Transmission line | |
US2332952A (en) | Means to suppress radio frequency waves upon the inside of tubular conductors | |
US2413608A (en) | Time-delay network | |
US2419855A (en) | Arrangement adapted to suppress radio frequency currents on conductors | |
US20060137891A1 (en) | Apparatus and methods for unshielded twisted wire pair radiated emission suppression | |
GB1157730A (en) | Transmission Line Termination Circuit | |
US2950454A (en) | Helix wave guide | |
US2419577A (en) | Antenna system | |
US2485606A (en) | Protective coupling circuit | |
US2879318A (en) | Shield for electric current apparatus | |
US2288030A (en) | Transmission line structure | |
US2605356A (en) | Radio-frequency power divider circuit | |
US2925566A (en) | Broad band balun transformer | |
US2503952A (en) | Traveling wave antenna |