EP0084311B1 - Dispositif de protection d'un câble coaxial contre les impulsions parasites de basse fréquence et de forte puissance - Google Patents

Dispositif de protection d'un câble coaxial contre les impulsions parasites de basse fréquence et de forte puissance Download PDF

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Publication number
EP0084311B1
EP0084311B1 EP83100010A EP83100010A EP0084311B1 EP 0084311 B1 EP0084311 B1 EP 0084311B1 EP 83100010 A EP83100010 A EP 83100010A EP 83100010 A EP83100010 A EP 83100010A EP 0084311 B1 EP0084311 B1 EP 0084311B1
Authority
EP
European Patent Office
Prior art keywords
coaxial
ground plate
high power
low frequency
coaxial cable
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
Application number
EP83100010A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0084311A1 (fr
Inventor
Joel Boby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cables de Lyon SA
Original Assignee
Cables de Lyon SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cables de Lyon SA filed Critical Cables de Lyon SA
Publication of EP0084311A1 publication Critical patent/EP0084311A1/fr
Application granted granted Critical
Publication of EP0084311B1 publication Critical patent/EP0084311B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20363—Linear resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/2039—Galvanic coupling between Input/Output

Definitions

  • the present invention relates to a device for protecting a coaxial cable against parasitic pulses of low frequency and high power, in particular electrical discharges from disturbing effects whose frequency is between a few hertz and a few megahertz while the frequencies of use of the coaxial cable can be between around thirty megahertz and a few gigahertz.
  • FIG. 1 A classic example of embodiment with coaxial lines is represented in FIG. 1.
  • each of the lateral arms and the transverse arms have for length a quarter of the wavelength at the frequency of use.
  • a short circuit 3 between the outer sheath of the tee and the central conductor brings back to the center 4 of the tee between the central conductor and the outer sheath an infinite impedance at the frequency of use and an impedance practically zero for the signals at the disturbance frequency.
  • the lateral arms of the tee having a half wavelength of total length at the frequency of use cause a coupling between the two coaxial plugs 1 and 2.
  • Tees and traps of the prior art made of rigid conductive metal such as copper are heavy and bulky because their largest mechanical dimension is half a wavelength.
  • the device according to the present invention overcomes this drawback. This in fact makes it possible to provide effective protection against parasitic power pulses while having more compact dimensions in order to reduce the bulk and the weight.
  • the subject of the present invention is a device for protecting a coaxial cable against low frequency and high power parasitic pulses comprising quarter-wave transmission line impedance transformers, in which said lines of transmission are made in folded microstrip to reduce the size of the device.
  • the device comprising coaxial input and output plugs for the use signals and a Tee whose lateral arms and the transverse arm form a quarter wavelength at the frequency of the signals d use is characterized by the fact that said conductive microstrip arranged on a dielectric substrate secured to a ground plate comprises the two lateral arms and the transverse arm folded back in an E shape, each of the lateral arms being folded back so as to be connected to said conductor central of said coaxial plug whose outer sheath is connected to said ground plate, and the transverse arm or horizontal central bar of the E being folded over said substrate to be connected to said ground plate.
  • the device comprising coaxial input and output plugs for the usage signals and a trap consisting of a quarter wave transmission line at the frequency of the usage signals, connected to a circuit break connecting the central conductors of said coaxial plugs characterized in that two folded microstrips are disposed respectively between a first and a third dielectric substrate, a first ground plate and a second ground plate respectively covering the outside of said first and third substrates.
  • the outer sheaths of said coaxial plugs being connected to at least one of said ground plates, said plugs being arranged substantially symmetrically with respect to two portions facing the two microstrips, these portions having a length equal to a quarter of wave the folded parts of each of the two microstrips being connected to each of said central conductors of said coaxial plugs.
  • said mass and / or microstrip plates are produced by screen printing or by chemical attack, metallization by projection or electrolytic deposition.
  • said substrates are made of a dielectric material from the group of charged or uncharged polymers (for example glass-polymer), ceramics (for example alumina, beryllium oxide, titanium dioxide), enamels , etc ...
  • charged or uncharged polymers for example glass-polymer
  • ceramics for example alumina, beryllium oxide, titanium dioxide
  • enamels etc ...
  • a quarter wave Tee is used to decouple the parasitic signals coming for example from electromagnetic pulses of low frequency and high power.
  • the Tee has a conductive microstrip trice 5, which can be either a conductive ink deposited by screen printing or a conductive metal whose shape is obtained by chemical attack.
  • the microstrip 5 is supported by one face of the dielectric substrate 6. On the opposite face of the substrate 6 is disposed a ground plate 7 covering all of this face and obtained by the same methods as the microstrip 5.
  • the outer sheaths 11 and 21 of the coaxial plugs 1 and 2 are secured to the ground plate 7, for example by welding.
  • the central conductors 12 and 22 of the coaxial plugs 1 and 2 are connected to the E-shaped microstrip 5 respectively at the lower and upper horizontal ribs of the E.
  • the length between the apex A of the tee and the central conductors 12 or 22 is equal to Ag / 4.
  • the horizontal central bar of the E is extended and folded towards a point B arranged on the side of the substrate 6 to connect it to the ground plate 7.
  • the length AB is also equal to ⁇ g / 4.
  • the guided wavelength ⁇ g is obtained from the wavelength in a vacuum ⁇ o by the relation
  • the dimensions of the device are greatly reduced compared to the Tee device of the known art.
  • the width of the microstrip determines the characteristic impedance thereof and makes it possible to increase, by a judicious choice thereof, the bandwidth of the device which can be contained in a metal enclosure forming a Faraday cage.
  • FIG. 3 shows an example of a quarter-wave trap arranged between two coaxial plugs 1 and 2.
  • Three dielectric substrates 61, 62, 63 which may be of the same materials as in FIG. 2 are superimposed between two ground plates 71 and 72.
  • Two microstrips 51 and 52 are disposed respectively between the substrates 61 and 62 and between the substrates 62 and 63 either on the substrate 61 and the substrate 63 or on the opposite faces of the substrate 62.
  • the metallizations are carried out in the same way as in FIG. 2.
  • the microstrips 51 and 52 are respectively connected to the central conductors 12 and 22 of the coaxial plugs 1 and 2.
  • the opposite parts of the microstrips 51 and 52 constitute a portion of quarter of a guided wavelength.
  • the open circuit C brings back in D a circuit of zero impedance at the frequency of use and a trap for the continuous signals or lower frequencies.
  • the protection device according to the present invention is in the field of microstrip resonant circuits.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Communication Cables (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Waveguides (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Details Of Aerials (AREA)
EP83100010A 1982-01-05 1983-01-04 Dispositif de protection d'un câble coaxial contre les impulsions parasites de basse fréquence et de forte puissance Expired EP0084311B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8200032A FR2519474B1 (fr) 1982-01-05 1982-01-05 Dispositif de protection d'un cable coaxial contre les impulsions parasites de basse frequence et de forte puissance
FR8200032 1982-01-05

Publications (2)

Publication Number Publication Date
EP0084311A1 EP0084311A1 (fr) 1983-07-27
EP0084311B1 true EP0084311B1 (fr) 1988-06-01

Family

ID=9269704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100010A Expired EP0084311B1 (fr) 1982-01-05 1983-01-04 Dispositif de protection d'un câble coaxial contre les impulsions parasites de basse fréquence et de forte puissance

Country Status (6)

Country Link
US (1) US4542358A (ko)
EP (1) EP0084311B1 (ko)
JP (1) JPS58121801A (ko)
CA (1) CA1193677A (ko)
DE (1) DE3376931D1 (ko)
FR (1) FR2519474B1 (ko)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610032A (en) * 1985-01-16 1986-09-02 At&T Bell Laboratories Sis mixer having thin film wrap around edge contact
GB8623178D0 (en) * 1986-09-26 1987-01-14 Raychem Ltd Circuit protection device
US4985800A (en) * 1989-10-30 1991-01-15 Feldman Nathan W Lighting protection apparatus for RF equipment and the like
CA2182827A1 (en) * 1995-08-11 1997-02-12 Albert Zaretsky Apparatus for and method of suppressing power surges utilizing electrical striplines
GB2326766A (en) * 1996-03-06 1998-12-30 Central Research Lab Ltd Apparatus for blocking unwanted components of a signal
GB2358533A (en) * 2000-01-21 2001-07-25 Dynex Semiconductor Ltd Antenna; feed; alarm sensor
SE523526C2 (sv) * 2000-07-07 2004-04-27 Smarteq Wireless Ab Adapterantenn avsedd att samverka elektromagnetiskt med en antenn inbyggd i en mobiltelefon
DE10133359A1 (de) * 2001-07-10 2003-01-23 Rohde & Schwarz Breitbandige Blitzschutzvorrichtung
CA2447094A1 (en) * 2003-10-28 2005-04-28 Mladen Marko Kekez Explosively driven radio frequency pulse generating apparatus
CA2447187A1 (en) * 2003-10-28 2005-04-28 Mladen Marko Kekez Radio frequency pulse generating apparatus
JP4706861B2 (ja) * 2006-11-28 2011-06-22 大同特殊鋼株式会社 バンドパスフィルタ
DE102014105594A1 (de) * 2014-04-17 2015-10-22 Conti Temic Microelectronic Gmbh Elektronisches system
CN104078726B (zh) * 2014-06-04 2016-07-06 中国电子科技集团公司第十研究所 并联型单侧椭圆函数传输线滤波器
US10791656B1 (en) * 2019-11-01 2020-09-29 Advanced Fusion Systems Llc Method and device for separating high level electromagnetic disturbances from microwave signals

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643296A (en) * 1949-09-28 1953-06-23 Betsy R Hansen High-frequency energy dividing apparatus
US3164790A (en) * 1963-02-12 1965-01-05 Boeing Co Sinuously folded quarter wave stripline directional coupler
US3534301A (en) * 1967-06-12 1970-10-13 Bell Telephone Labor Inc Temperature compensated integrated circuit type narrowband stripline filter
US3617955A (en) * 1969-04-08 1971-11-02 Bell Telephone Labor Inc Temperature compensated stripline filter
FR2171996B1 (ko) * 1972-02-18 1980-06-06 Thomson Csf
FR2254864B1 (ko) * 1973-12-18 1976-10-08 Cables De Lyon Geoffroy Delore
US3976959A (en) * 1974-07-22 1976-08-24 Gaspari Russell A Planar balun
US4424500A (en) * 1980-12-29 1984-01-03 Sperry Corporation Beam forming network for a multibeam antenna

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Reinmut K. Hoffmann "Integrierte Mikrowellenschaltungen" Springer Verlag Berlin *

Also Published As

Publication number Publication date
EP0084311A1 (fr) 1983-07-27
FR2519474A1 (fr) 1983-07-08
CA1193677A (fr) 1985-09-17
JPS58121801A (ja) 1983-07-20
FR2519474B1 (fr) 1985-09-20
JPH0259641B2 (ko) 1990-12-13
US4542358A (en) 1985-09-17
DE3376931D1 (en) 1988-07-07

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