EP0113818A2 - Blocking device for surface waves - Google Patents

Blocking device for surface waves Download PDF

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Publication number
EP0113818A2
EP0113818A2 EP83110857A EP83110857A EP0113818A2 EP 0113818 A2 EP0113818 A2 EP 0113818A2 EP 83110857 A EP83110857 A EP 83110857A EP 83110857 A EP83110857 A EP 83110857A EP 0113818 A2 EP0113818 A2 EP 0113818A2
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EP
European Patent Office
Prior art keywords
coaxial cable
piece
wave
metal clamp
frequency range
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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.)
Granted
Application number
EP83110857A
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German (de)
French (fr)
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EP0113818A3 (en
EP0113818B1 (en
Inventor
Dieter Dipl.-Phys. Schenkyr
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Richard Hirschmann & Co Te Esslingen Bondsr GmbH
Original Assignee
HIRSCHMANN RADIOTECHNIK
Hirschmann Electronics GmbH and Co KG
Richard Hirschmann Radiotechnisches Werk
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Application filed by HIRSCHMANN RADIOTECHNIK, Hirschmann Electronics GmbH and Co KG, Richard Hirschmann Radiotechnisches Werk filed Critical HIRSCHMANN RADIOTECHNIK
Priority to AT83110857T priority Critical patent/ATE46986T1/en
Publication of EP0113818A2 publication Critical patent/EP0113818A2/en
Publication of EP0113818A3 publication Critical patent/EP0113818A3/en
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Publication of EP0113818B1 publication Critical patent/EP0113818B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/06—Details

Definitions

  • the invention relates to a standing wave barrier for antennas with a symmetrical connection dipole and a coaxial cable connected thereto with an outer insulating sleeve, preferably for television reception in the entire UHF range IV / V (470 ... 790 MHz) or in part thereof.
  • Known UHF receiving antennas of this type have a broadband full-wave dipole with a connection resistance of approximately 300 ohms as the connection dipole and a half-wave bypass line acting as a balancing transformer for connecting a coaxial cable with a characteristic impedance of 75 ohms.
  • the antenna gain is thereby reduced and the directional characteristic of the antenna is considerably impaired.
  • the main reception direction can deviate by up to about 20 ° from the target value (squint), the side and back corners become larger and the zero point attenuation is smaller, especially in the directions perpendicular to the main reception direction.
  • Frequency-dependent fluctuations in the common-mode currents can also result in irregularities (dips) in the frequency-dependent gain curve of the useful wave.
  • narrow-band, but not transforming symmetry elements and sheath wave barriers are also known, in which an initial piece of a coaxial cable is enclosed by a quarter-wave blocking pot or with a parallel-connected one at the end shorted coaxial cable piece is equipped, which is also tuned in quarter-wave resonance.
  • the locking pot and the piece of cable at the short-circuited end are conductively connected to the outer conductor of the continuous coaxial cable, as a result of which the insulating sleeve is interrupted and the corrosion protection of the outer conductor is no longer guaranteed.
  • the object of the invention is to create a sheath lock of the type specified at the outset which suppresses common mode currents in a simple and cost-saving manner over a broad band in the entire operating frequency range and does not require a conductive connection to the outer conductor of the coaxial cable.
  • the object is achieved in that an antenna-side initial piece of the coaxial cable is guided at a large distance from a metal carrier part with zero potential and a piece of the coaxial cable adjoining the initial piece is fastened tightly to the metal carrier part with a metal clamp comprising its outer insulating sleeve, in such a way that in the operating frequency range for the jacket shaft has a much smaller resistance in the area of the metal clamp than in the area of the starting piece and that its length is dimensioned such that a high resistance is effective at its input for the jacket shaft in the operating frequency range.
  • the jacket wave barrier according to the invention is thus constructed without any special parts which are not in themselves required for the antenna and is therefore extremely cost-effective. In addition, it does not need a conductive connection with the outer cable, so that its corrosion protection is completely preserved by the outer insulating sleeve.
  • this is equipped with a balun, preferably a half-wave detour line, in order to reduce the dipole connection resistance of approximately 300 ohms into the wave resistance of the coaxial cable (75 ohms ) to transform.
  • the start piece and the cable piece within the metal clamp are so long that there is quarter-wave resonance within or below the operating frequency range, preferably in the vicinity of its lower limit.
  • the outer conductor of the coaxial cable within the metal clamp is the inner conductor of a coaxial cable piece, the outer conductor of which is the metal clamp and the dielectric is the outer cable sheath.
  • this cable piece has a characteristic impedance Zm 2 of approximately 10 ohms and a small attenuation because it is very short.
  • Zm 2 characteristic impedance
  • the resistance R m3 at the end of the cable section inside the metal clamp is indefinite because it depends on the cable routing. However, it is also greater than 10 ohms under unfavorable circumstances, since the following line has a high characteristic impedance and considerable attenuation due to radiation and losses in the steel standpipe.
  • the resistance R m2 at the beginning of the ringed cable section is therefore less than 10 ohms at the resonance frequency and a correspondingly low impedance at the edges of a very wide frequency range. For these reasons, the lengths of the two transforming cable pieces and the resulting size of the resonance frequencies are not critical.
  • the resonance frequency of the half-wave bypass line which is used as a balun, is usually slightly below the upper limit of the operating frequency range, so that the maximum value of the antenna gain that occurs there is as large as possible.
  • the lengths of the two transforming line sections are to be dimensioned such that the input resistance on the coaxial cable is large in the lower part of the operating frequency range.
  • the resonance frequencies calculated from the lengths of the line sections can also be below the lower limit of the operating frequency range, because parts of these line sections compensate capacitive reactive components of the impedances effective at the ends and the desired effects are achieved in a very wide frequency range. This applies not only to the improvement of the characteristic curve, but also to the elimination of the irregularities in the frequency response of the gain mentioned in the lower part of the operating frequency range. This can also result in an increase in antenna gain, since a sufficient resistance adjustment of the antenna to the coaxial cable can also be achieved.
  • the cable piece inside to surround the metal clamp with an insulating material that has very large high-frequency losses and / or a very high dielectric constant.
  • the metal clamp can be so short that the strapped piece of cable acts like a capacitance, which has a small damping resistance in parallel or which is very large due to the high dielectric constant and forms a small reactance even at the lowest operating frequency.
  • the metal clamp with which the coaxial cable is to be attached to an antenna support part has a longitudinal slot, the width of which is smaller than the outer diameter of the coaxial cable, which can be pressed into the sufficiently resilient metal clamp.
  • a further advantageous embodiment of the jacket shaft lock according to the invention consists in that the metal clamp has several legs separated by transverse slots, of which only a part rests under pressure on the assembled coaxial cable. This makes it easier to push the cable in because only the considerably shortened legs have to deflect one after the other.
  • the figures show two exemplary embodiments of the standing wave barrier according to the invention, each on an antenna.
  • FIGS. 1 and 3 are side views of the antenna parts concerned and FIGS. 2 and 4 cross sections through the antenna support with the metal clamp and the coaxial cable.
  • FIG. 1 and 2 is of a longitudinal member made of metal, on which the receiving dipole 1 with the cable junction box 2, and directors, not shown, and Reflectors are attached, only a short piece 3 drawn.
  • a metal clamp 5 with two resilient legs 6 which are symmetrical to one another is attached to the longitudinal beam 3 made of metal tube with a rectangular cross section by means of self-tapping screws 4. These leave a longitudinal slot? free, the width of which is smaller than the diameter of the coaxial cable 8 pressed into the metal clamp 5 through this slot 7, the outer conductor 9 of which is surrounded by a protective insulating sleeve 10.
  • the starting piece 11 of the coaxial cable 6 has a large distance from the side member 3 from the connection (not shown) to a balun in the cable connection box 2 to the metal clamp 5.
  • the starting piece 11 and the metal clamp 5 each have a length at which there is a very high input resistance for the jacket shaft in the operating frequency range.
  • a so - called pre-mast antenna is used, in which a metal clamp 12 is fastened to a support 13 of a reflector screen (not shown) with sheet metal driving screws 14.
  • Resilient clips 16 and 17 are formed on the metal clamp 12 by transverse slots 15.
  • the width of the longitudinal slot 18 through which the coaxial cable 8 is pressed onto the carrier 13 and into the brackets 16 and 17 is smaller in the narrow brackets 16 than the outer diameter of the cable 8 and approximately the same in the wide brackets 17 Diameter to facilitate the insertion of the coaxial cable 8.
  • the lengths of the starting piece 19 and the metal clamp 12 are dimensioned in the same way as in the first exemplary embodiment.

Abstract

1. A blocking device for surface waves for a symmetrical antenna working in the operational frequency range with a connection dipole (1) and, connected to this directly or via a symmetrization element (2), a coaxial cable (8) with an external insulation sheath, preferred use of said antenna being for television reception over the entire UHF range of 470 - 790 MHz, for said blocking device for surface waves the starting section of the coaxial cable on the antenna side being located with clearance by means of a metallic bracket and a section of the coaxial cable connected to the starting section immediately at the metallic bracket, is characterized in that the section of the coaxial cable (8) located immediately at the metallic bracket (3, 13) is encircled by a metallic clip (5, 12) and that the lengths of the starting section on the antenna side (11, 19) as well as that of the section of the coaxial cable (8) encircled by the metallic clip are in each case one quarter of a wavelength within the operational frequency range.

Description

Die Erfindung betrifft eine Mantelwellensperre für Antennen mit symmetrischem Anschlußdipol und einem daran angeschlossenen Koaxialkabel mit einer äußeren Isolierhülle, vorzugsweise zum Fernsehempfang im gesamten UHF-Bereich IV/V (470 ... 790 MHz) oder in einem Teil davon.The invention relates to a standing wave barrier for antennas with a symmetrical connection dipole and a coaxial cable connected thereto with an outer insulating sleeve, preferably for television reception in the entire UHF range IV / V (470 ... 790 MHz) or in part thereof.

Bekannte UHF-Empfangsantennen dieser Art haben als Anschlußdipol einen breitbandigen Ganzwellendipol mit einem Anschlußwiderstand von ungefähr 300 Ohm und zum Anschließen eines Koaxialkabels mit einem Wellenwiderstand von 75 Ohm eine als Symmetrierübertrager wirkende Halbwellen-Umwegleitung. DieseKnown UHF receiving antennas of this type have a broadband full-wave dipole with a connection resistance of approximately 300 ohms as the connection dipole and a half-wave bypass line acting as a balancing transformer for connecting a coaxial cable with a characteristic impedance of 75 ohms. These

ist zwar einfach und kostengünstig, aber schmalbandig(an den Bereichsgrenzen des UHF-Bereiches- IV/V treten gegenüber der Bandmitte Phasendifferenzen von bis.zu 400 auf), so daß beiis simple and inexpensive, but narrow-band (at the area limits of the UHF area IV / V phase differences of up to 40 0 occur compared to the middle of the band), so that at

von ihrer Resonanzfrequenz abweichende Betriebsfrequenzen dem Koaxialkabel nicht nur die durch Gegentaktanregung des Dipols erzeugte Nutzwelle zugeführt wird, sondern auch durch Gleichtaktanregung des Dipols entstehende Gleichtaktströme.Operating frequencies deviating from their resonance frequency are not only fed to the coaxial cable with the useful wave generated by push-pull excitation of the dipole, but also common-mode currents resulting from common-mode excitation of the dipole.

Diese fließen als sogenannte Mantelwellen auf dem Außenleiter des Koaxialkabels und Teilen des Metallträgers und des Standrohres der Antenne als zweitem Leiter. Dadurch wird der Antennengewinn verringert und die Richtkennlinie der Antenne erheblich beeinträchtigt. Die Hauptempfangsrichtung kann bis zu etwa 20° vom Sollwert abweichen (Schielen), die Seiten- und Rückzipfel werden größer und die Nullstellendämpfungen besonders in den Richtungen senkrecht zur Hauptempfangsrichtung kleiner.These flow as so-called jacket waves on the outer conductor of the coaxial cable and parts of the metal support and the standpipe of the antenna as the second conductor. The antenna gain is thereby reduced and the directional characteristic of the antenna is considerably impaired. The main reception direction can deviate by up to about 20 ° from the target value (squint), the side and back corners become larger and the zero point attenuation is smaller, especially in the directions perpendicular to the main reception direction.

Durch frequenzabhängige Schwankungen der Gleichtaktströme können sich außerdem in der frequenzabhängigen Gewinnkurve der Nutzwelle Unregelmäßigkeiten (Einbrüche) ergeben.Frequency-dependent fluctuations in the common-mode currents can also result in irregularities (dips) in the frequency-dependent gain curve of the useful wave.

AuBer der Halbwellen-Umwegleitung, die in einem schmalen Frequenzbereich um die Resonanzfrequenz als Mantelwellensperre wirkt, sind ebenfalls schmalbandige, aber nicht transformierende Symmetrierglieder und Mantelwellensperren bekannt, bei denen ein Anfangsstück eines Koaxialkabels von einem Viertelwellen - Sperrtopf umschlossen oder mit einem parallel geschalteten, am Ende kurzgeschlossenen Koaxialkabelstück ausgestattet ist, das ebenfalls in Viertelwellenresonanz abgestimmt ist. Dabei sind der Sperrtopf und das Kabelstück am kurzgeschlossenen Ende leitend mit dem AuBenleiter des durchlaufenden Koaxialkabels verbunden, wodurch dessen Isolierhülle unterbrochen und damit der Korrosionsschutz des KabelauBenleiters nicht mehr gewährleistet ist.In addition to the half-wave bypass line, which acts as a sheath wave barrier in a narrow frequency range around the resonance frequency, narrow-band, but not transforming symmetry elements and sheath wave barriers are also known, in which an initial piece of a coaxial cable is enclosed by a quarter-wave blocking pot or with a parallel-connected one at the end shorted coaxial cable piece is equipped, which is also tuned in quarter-wave resonance. The locking pot and the piece of cable at the short-circuited end are conductively connected to the outer conductor of the continuous coaxial cable, as a result of which the insulating sleeve is interrupted and the corrosion protection of the outer conductor is no longer guaranteed.

Der Erfindung liegt die Aufgabe zugrunde, eine Mantelsperre der eingangs angegebenen Art zu schaffen, die Gleichtaktströme auf einfache und kostensparende Weise breitbandig im gesamten Be - triebsfrequenzbereich unterdrückt und keine leitende Verbindung mit dem AuBenleiter des Koaxialkabels erfordert.The object of the invention is to create a sheath lock of the type specified at the outset which suppresses common mode currents in a simple and cost-saving manner over a broad band in the entire operating frequency range and does not require a conductive connection to the outer conductor of the coaxial cable.

Die Aufgabe ist dadurch gelöst, daB ein antennenseitiges Anfangsstück des Koaxialkabels in groBem Abstand von einem Metallträgerteil mit Nullpotential geführt und ein an das Anfangsstück anschließendes Stück des Koaxialkabels mit einer dessen äuBere Isolierhülle umfassenden Metallschelle dicht an dem Metallträgerteil befestigt ist, derart, daB im Betriebsfrequenzbereich für die Mantelwelle im Bereich der Metallschelle ein viel kleinerer Widerstand wirksam ist als im Bereich des Anfangsstücks und daB dessen Länge so bemessen ist, daB an seinem Eingang für die Mantelwelle im Betriebsfrequenzbereich ein hoher Widerstand wirksam ist.The object is achieved in that an antenna-side initial piece of the coaxial cable is guided at a large distance from a metal carrier part with zero potential and a piece of the coaxial cable adjoining the initial piece is fastened tightly to the metal carrier part with a metal clamp comprising its outer insulating sleeve, in such a way that in the operating frequency range for the jacket shaft has a much smaller resistance in the area of the metal clamp than in the area of the starting piece and that its length is dimensioned such that a high resistance is effective at its input for the jacket shaft in the operating frequency range.

Der Aufbau der erfindungsgemäBen Mantelwellensperre erfolgt also ohne besondere, nicht für die Antenne an sich schon benötigte Teile und ist damit äußerst kostengünstig. Darüberhinaus kommt sie ohne leitende Verbindung mit dem KabelauBenleiter aus, so daß dessen Korrosionsschutz durch die äuBere Isolierhülle vollständig erhalten bleibt.The jacket wave barrier according to the invention is thus constructed without any special parts which are not in themselves required for the antenna and is therefore extremely cost-effective. In addition, it does not need a conductive connection with the outer cable, so that its corrosion protection is completely preserved by the outer insulating sleeve.

Bei der vorteilhaften Verwendung der erfindungsgemäBen Mantelwellensperre für eine UHF-Empfangsantenne mit einem breitbandigen Ganzwellen-AnschluBdipol ist dieser mit einem Symmetrier - übertrager, vorzugsweise einer Halbwellen-Umwegleitung ausge - stattet, um den Dipolanschlußwiderstand von etwa 300 Ohm in den Wellenwiderstand des Koaxialkabels (75 Ohm) zu transformieren.In the advantageous use of the sheathed wave barrier according to the invention for a UHF receiving antenna with a broadband full-wave connection dipole, this is equipped with a balun, preferably a half-wave detour line, in order to reduce the dipole connection resistance of approximately 300 ohms into the wave resistance of the coaxial cable (75 ohms ) to transform.

Bei einer vorteilhaften Ausführung der erfindungsgemäßen Mantelwellensperre nach Anspruch 3 sind das Anfangsstück und das Kabelstück innerhalb der Metallschelle so lang, daß sich innerhalb oder unterhalb des βetriebsfrequenzbereiches, vorzugsweise in der Nähe von dessen unterer Grenze, Viertelwellenresonanz ergibt.In an advantageous embodiment of the jacket wave barrier according to the invention according to claim 3, the start piece and the cable piece within the metal clamp are so long that there is quarter-wave resonance within or below the operating frequency range, preferably in the vicinity of its lower limit.

Bei praktisch erprobten erfindungsgemäßen Mantelwellensperren für UHF-Fernsehempfangsantennen hat das Anfangsstück des Koaxialkabels für die Mantelwellen einen Wellenwiderstand Zm1 in der Größenordnung von 300 Ohm. Wenn an seinem Ende ein Widerstand Rm2 von etwa 10 Ohm wirksam ist, ergibt sich am Kabelanfang für die Resonanzfrequenz nach der Formel Rm1 . Rm2 = Zm1 ein Widerstand Rm1 von ungefähr 9 kOhm, der mehr als hundertmal so groB ist wie der transformierte Dipolanschlußwiderstand (75 Ohm). Wegen des großen Wellenwiderstandes Zm1 des transformierenden Kabelstücks ergibt sich auch an den Grenzen eines weiten Frequenzbereichs ein hoher, die Mantelwellen ausreichend unter,- bindender Scheinwiderstand.In practice-proven jacket wave barriers according to the invention for UHF television reception antennas, the beginning of the coaxial cable for the jacket waves has a characteristic impedance Z m1 in the order of magnitude of 300 ohms. If a resistance R m2 of approximately 10 ohms is effective at its end, the resonance frequency results from the formula R m1 at the beginning of the cable. Rm2 = Zm1 a resistance R m1 of approximately 9 kOhm, which is more than a hundred times larger than the transformed dipole connection resistance (75 ohms). Because of the large wave resistance Z m1 of the transforming cable section, there is also a high impedance that binds the sheath waves sufficiently at the limits of a wide frequency range.

Der Außenleiter des Koaxialkabels ist innerhalb der Metall - schelle der Innenleiter eines koaxialen Kabelstücks, dessen Außenleiter die Metallschelle und dessen Dielektrikum die äußere Kabelhülle ist. Dieses Kabelstück hat bei-für Antennen gebräuchlichen Koaxialkabeln mit ungefähr 5 mm Außenleiterdurchmesser einen Wellenwiderstand Zm2 von ungefähr 10 Ohm und eine kleine Dämpfung, weil es sehr kurz ist. An seinem Ende folgt für die Mantelwelle wieder eine Leitung mit hohem Wellenwiderstand, weil der Außenleiter in großem Abstand vom Antennenträger und vom Standrohr verläuft, oder in das Standrohr mit großem lichtem Durch-messer eingezogen ist. Der Widerstand Rm3 am Ende des Kabel - stücks innerhalb der Metallschelle ist unbestimmt, weil er von der Kabelführung abhängig ist. Er ist aber auch unter ungünstigen Umständen größer als 10 Ohm, da die folgende Leitung einen hohen Wellenwiderstand und eine erhebliche Dämpfung durch Strahlung und Verluste im Stahlstandrohr aufweist. Der Widerstand Rm2 am Anfang des angeschellten Kabelstücks ist demnach bei der Resonanzfrequenz kleiner als 10 Ohm und an den Rändern eines sehr weiten Frequenzbereichs ein entsprechend kleiner Schein - widerstand. Aus diesen Gründen sind die Längen der beiden transformierenden Kabelstücke und die dadurch bedingten Größen der Resonanzfrequenzen nicht kritisch.The outer conductor of the coaxial cable within the metal clamp is the inner conductor of a coaxial cable piece, the outer conductor of which is the metal clamp and the dielectric is the outer cable sheath. In the case of coaxial cables which are customary for antennas and have an outer conductor diameter of approximately 5 mm, this cable piece has a characteristic impedance Zm 2 of approximately 10 ohms and a small attenuation because it is very short. At the end there is again a line with a high wave resistance for the jacket shaft, because the outer conductor runs at a large distance from the antenna carrier and from the standpipe, or into the standpipe with a large clear diameter. knife has moved in. The resistance R m3 at the end of the cable section inside the metal clamp is indefinite because it depends on the cable routing. However, it is also greater than 10 ohms under unfavorable circumstances, since the following line has a high characteristic impedance and considerable attenuation due to radiation and losses in the steel standpipe. The resistance R m2 at the beginning of the ringed cable section is therefore less than 10 ohms at the resonance frequency and a correspondingly low impedance at the edges of a very wide frequency range. For these reasons, the lengths of the two transforming cable pieces and the resulting size of the resonance frequencies are not critical.

Die Resonanzfrequenz der als Symmetrierübertrager gebräuchlichen Halbwellenumwegleitung liegt meistens wenig unterhalb der oberen Grenze des Betriebsfrequenzbereiches, damit der dort auftretende Höchstwert des Antennengewinns möglichst groß wird. Dabei sind die Längen der beiden transformierenden Leitungsstücke so zu bemessen, daß der Eingangswiderstand am Koaxialkabel im unteren Teil des Betriebsfrequenzbereiches groß ist. Die aus den Längen der Leitungsstücke errechneten Resonanzfrequenzen können auch unterhalb der unteren Grenze des Betriebsfrequenzbereiches liegen, weil Teile dieser Leitungsstücke kapazitive Blindanteile der an den Enden wirksamen Scheinwiderstände kompensieren und die angestrebten Wirkungen in einem sehr weiten Frequenzbereich erreicht werden. Das gilt nicht nur für die Verbesserung der Richtkennlinie, sondern auch für die Beseitigung der bereits erwähnten Unregelmäßigkeiten im Frequenzgang des Gewinns im unteren Teil des Betriebsfrequenzbereichs. In diesem kann sich auch eine Zunahme des Antennengewinns ergeben, da auch eine dafür ausreichende Widerstandsanpassung der Antenne an das Koaxialkabel zu erreichen ist.The resonance frequency of the half-wave bypass line, which is used as a balun, is usually slightly below the upper limit of the operating frequency range, so that the maximum value of the antenna gain that occurs there is as large as possible. The lengths of the two transforming line sections are to be dimensioned such that the input resistance on the coaxial cable is large in the lower part of the operating frequency range. The resonance frequencies calculated from the lengths of the line sections can also be below the lower limit of the operating frequency range, because parts of these line sections compensate capacitive reactive components of the impedances effective at the ends and the desired effects are achieved in a very wide frequency range. This applies not only to the improvement of the characteristic curve, but also to the elimination of the irregularities in the frequency response of the gain mentioned in the lower part of the operating frequency range. This can also result in an increase in antenna gain, since a sufficient resistance adjustment of the antenna to the coaxial cable can also be achieved.

Eine andere vorteilhafte Maßnahme zum Erreichen des erforder-lichen kleinen Widerstands am Ende des Anfangsstücks des Koaxialkabels besteht gemäß Anspruch 4 darin, das Kabelstück innerhalb der Metallschelle mit einem Isoliermaterial zu umgeben, das sehr große Hochfrequenzverluste und/oder eine sehr hohe Di - elektrizitätskonstante hat. Dabei kann die Metallschelle so kurz sein, daß das angeschellte Kabelstück wie eine Kapazität wirkt, der ein kleiner Dämpfungswiderstand parallel liegt oder die durch die hohe Dielektrizitätskonstante sehr groß ist und auch bei der tiefsten Betriebsfrequenz noch einen kleinen Blindwiderstand bildet.Another advantageous measure for achieving the required small resistance at the end of the start piece of the coaxial cable is, according to claim 4, the cable piece inside to surround the metal clamp with an insulating material that has very large high-frequency losses and / or a very high dielectric constant. The metal clamp can be so short that the strapped piece of cable acts like a capacitance, which has a small damping resistance in parallel or which is very large due to the high dielectric constant and forms a small reactance even at the lowest operating frequency.

Bei einer vorteilhaften Ausgestaltung der erfindungsgemäßen Mantelwellensperre nach Anspruch 5 hat die Metallschelle, mit der das Koaxialkabel an einem Antennenträgerteil zu befestigen ist, einen Längsschlitz, dessen Breite kleiner ist als der Außendurchmesser des Koaxialkabels, das in die ausreichend federnde Metallschelle eindrückbar ist. Dadurch wird der Vorteil erreicht, daß die Metallschelle schon bei der Antennenfertigung fest am Antennenträger angebracht werden kann und das Koaxialkabel bei der Antennenmontage in einfacher Weise nur noch in diese einzudrücken ist.In an advantageous embodiment of the jacket shaft lock according to the invention according to claim 5, the metal clamp with which the coaxial cable is to be attached to an antenna support part has a longitudinal slot, the width of which is smaller than the outer diameter of the coaxial cable, which can be pressed into the sufficiently resilient metal clamp. This has the advantage that the metal clamp can already be attached to the antenna carrier during antenna manufacture and the coaxial cable can only be pressed into the antenna assembly in a simple manner.

Eine weitere vorteilhafte Ausgestaltung der erfindungsgemäßen Mantelwellensperre besteht gemäß Anspruch 6. darin, daß die Metallschelle mehrere durch Querschlitze getrennte Schenkel aufweist, von denen nur ein Teil unter Druck am montierten Koaxialkabel anliegt. Dadurch wird das Eindrücken des Kabels erleichtert, weil dabei nur die erheblich verkürzten Schenkel einzeln nacheinander federnd ausweichen.müssen.A further advantageous embodiment of the jacket shaft lock according to the invention consists in that the metal clamp has several legs separated by transverse slots, of which only a part rests under pressure on the assembled coaxial cable. This makes it easier to push the cable in because only the considerably shortened legs have to deflect one after the other.

Die Figuren zeigen zwei Ausführungsbeispiele der erfindungs - gemäßen Mantelwellensperre jeweils an einer Antenne.The figures show two exemplary embodiments of the standing wave barrier according to the invention, each on an antenna.

Die Fig. 1 und 3 sind Seitenansichten der betroffenen Antennenteile und die Fig. 2 und 4 Querschnitte durch den Antennenträger mit der Metallschelle und dem Koaxialkabel.1 and 3 are side views of the antenna parts concerned and FIGS. 2 and 4 cross sections through the antenna support with the metal clamp and the coaxial cable.

Bei dem Ausführungsbeispiel nach den Figuren 1 und 2 ist von einem Längsträger aus Metall, an dem der Empfangsdipol 1 mit der Kabelanschlußdose 2, sowie nicht dargestellte Direktoren und Reflektoren befestigt sind, nur ein kurzes Stück 3 gezeichnet. An dem Längsträger 3 aus Metallrohr mit rechteckigem Quer - schnitt ist mit Blechtreibschrauben 4 eine Metallschelle 5 mit zwei zueinander symmetrischen federnden Schenkeln 6 angebracht. Diese lassen einen Längsschlitz ? frei, dessen Breite kleiner ist als der Durchmesser des durch diesen Schlitz 7 in die Metallschelle 5 eingedrückten Koaxialkabels 8, dessen Außenleiter 9 von einer Schutzisolierhülle 10 umgeben ist.In the embodiment of Figures 1 and 2 is of a longitudinal member made of metal, on which the receiving dipole 1 with the cable junction box 2, and directors, not shown, and Reflectors are attached, only a short piece 3 drawn. A metal clamp 5 with two resilient legs 6 which are symmetrical to one another is attached to the longitudinal beam 3 made of metal tube with a rectangular cross section by means of self-tapping screws 4. These leave a longitudinal slot? free, the width of which is smaller than the diameter of the coaxial cable 8 pressed into the metal clamp 5 through this slot 7, the outer conductor 9 of which is surrounded by a protective insulating sleeve 10.

Das Anfangsstück 11 des Koaxialkabels 6 hat vom nicht darge - stellten Anschluß an einem Symmetrierübertrager in der Kabelanschlußdose 2 bis zur Metallschelle 5 einen groBen Abstand vom Längsträger 3.The starting piece 11 of the coaxial cable 6 has a large distance from the side member 3 from the connection (not shown) to a balun in the cable connection box 2 to the metal clamp 5.

Das Anfangsstück 11 und die Metallschelle 5 haben jeweils eine Länge, bei der sich für die Mantelwelle im Betriebsfrequenzbereich ein sehr hoher Eingangswiderstand ergibt.The starting piece 11 and the metal clamp 5 each have a length at which there is a very high input resistance for the jacket shaft in the operating frequency range.

Beim Ausführungsbeispiel nach den Fig. 3 und 4 ist eine soge - nannte Vormastantenne verwendet, bei der eine Metallschelle 12 an einem Träger 13 eines nicht gezeichneten Reflektorschirms mit Blechtreibschrauben 14 befestigt ist. An der Metallschelle 12 sind durch Querschlitze 15 federnde.Klammern 16 und 17 gebil-det. Die Breite des Längsschlitzes 18, durch den das Koaxialkabel 8 auf den Träger 13 und in die Klammern 16 und 17 eingedrückt ist, ist bei den schmalen Klammern 16 kleiner als der AuBendurch - messer des Kabels 8 und bei den breiten Klammern 17 ungef ähr gleich diesem Durchmesser, um das Einschieben des Koaxialkabels 8 zu erleichtern.In the exemplary embodiment according to FIGS. 3 and 4, a so - called pre-mast antenna is used, in which a metal clamp 12 is fastened to a support 13 of a reflector screen (not shown) with sheet metal driving screws 14. Resilient clips 16 and 17 are formed on the metal clamp 12 by transverse slots 15. The width of the longitudinal slot 18 through which the coaxial cable 8 is pressed onto the carrier 13 and into the brackets 16 and 17 is smaller in the narrow brackets 16 than the outer diameter of the cable 8 and approximately the same in the wide brackets 17 Diameter to facilitate the insertion of the coaxial cable 8.

Die Längen des Anfangsstücks 19 und der Metallschelle 12 sind in der gleichen Weise bemessen wie beim ersten Ausführungsbei - spiel.The lengths of the starting piece 19 and the metal clamp 12 are dimensioned in the same way as in the first exemplary embodiment.

Claims (6)

1. Mantelwellensperre für Antennen mit symmetrischem AnschluBdipol und daran angeschlossenem Koaxialkabel mit einer äußeren Isolierhülle, vorzugsweise zum Fernsehempfang im gesamten UHF-Bereich von 470 ... 790 MHz oder in einem Teil davon, dadurch gekennzeichnet,
daß ein antennenseitiges Anfangsstück (11, 19) des Koaxialkabels (8) in großem Abstand von einem Metallträgerteil (3, 13) mit Nullpotential geführt und ein an das Anfangs - stück (11, 19) anschlieBendes Stück des Koaxialkabels (8) mit einer dessen äußere Isolierhülle (10) umfassenden Metallschelle (5, 12) dicht an dem Metallträgerteil (3, 13) be - festigt ist, derart daß im Betriebsfrequenzbereich für die Mantelwelle im Bereich der Metallschelle (5, 12) ein viel kleinerer Widerstand wirksam ist, als im Bereich des Anfangsstücks (11, 19) und daß dessen Länge so bemessen ist, daß an seinem Eingang für die Mantelwelle im Betriebsfrequenzbe - reich ein hoher Widerstand wirksam ist.1. Sheath wave barrier for antennas with a symmetrical connection dipole and connected coaxial cable with an outer insulating sleeve, preferably for television reception in the entire UHF range from 470 ... 790 MHz or in part thereof, characterized in that
that an antenna - side starting piece (11, 19) of the coaxial cable (8) is guided at a great distance from a metal support part (3, 13) with zero potential and a piece of the coaxial cable (8) connecting to the starting piece (11, 19) with one of them outer insulating sleeve (10) comprising metal clamp (5, 12) is fastened tightly to the metal carrier part (3, 13), so that in the operating frequency range for the jacket shaft in the area of the metal clamp (5, 12) a much smaller resistance is effective than in the area of the starting piece (11, 19) and that its length is dimensioned such that a high resistance is effective at its input for the jacket shaft in the operating frequency range. 2. Mantelwellensperre nach Anspruch 1, dadurch gekennzeichnet, daß zur Verbindung mit dem Anschlußdipol (1) ein vorzugsweise als Halbwellenumwegleitung ausgebildeter Symmetrierübertrager vorgesehen ist.2. Sheathed wave barrier according to claim 1 , characterized in that a preferably formed as a half-wave bypass line is provided for connection to the connection dipole ( 1 ). 3. Mantelwellensperre nach Anspruch 1 oder 2, dadurch gekenn - zeichnet, daß das Anfangsstück (11, 19) und das Koaxialkabelstück innerhalb der Metallschelle (5, 12) so lang sind, daß sich innerhalb oder unterhalb des Betriebsfrequenzbereiches, vorzugsweise in der Nähe von dessen unterer Grenze, Viertelwellenresonanz ergibt.3. Sheath wave barrier according to claim 1 or 2, characterized - characterized in that the starting piece (11, 19) and the coaxial cable piece within the metal clamp (5, 12) are so long that within or below the operating frequency range, preferably in the vicinity of whose lower limit gives quarter-wave resonance. 4. Mantelwellensperre nach einem der Ansprüche 1 bis 3, da - durch gekennzeichnet, daß das Koaxialkabelstück innerhalb der Metallschelle (5, 12) mit einem Isoliermaterial umgeben ist, das sehr große Hochfrequenzverluste und/oder eine sehr hohe Dielektrizitätskonstante aufweist.4. jacket wave barrier according to one of claims 1 to 3, characterized in that the coaxial cable piece within the metal clamp (5, 12) is surrounded with an insulating material which has very large high-frequency losses and / or a very high dielectric constant. 5. Mantelwellensperre nach einem der Ansprüche 1 bis 4, da - durch gekennzeichnet, daß das Koaxialkabel (8) durch einen Längsschlitz (7, 18), dessen Breite kleiner ist als der Außendurchmesser des Koaxialkabels (6), in die am Metallträgerteil (3, 13) befestigte, ausreichend federnde Metallschelle (5, 12) eindrückbar ist.5. Sheathed wave lock according to one of claims 1 to 4, since - characterized in that the coaxial cable (8) through a longitudinal slot (7, 18), the width of which is smaller than the outer diameter of the coaxial cable (6), in which on the metal support part (3 , 13) fastened, sufficiently resilient metal clamp (5, 12) can be pressed in. 6. Mantelwellensperre nach einem der Ansprüche 1 bis 5, da - durch gekennzeichnet, daß die Metallschelle (12) mehrere durch Querschlitze (15) voneinander getrennte Klammern (16, 17) aufweist, von denen nur ein Teil (16) unter Druck am montierten Koaxialkabel (8) anliegt.6. jacket shaft lock according to one of claims 1 to 5, characterized in that the metal clamp (12) has a plurality of brackets (16, 17) separated from one another by transverse slots (15), of which only a part (16) is mounted under pressure on Coaxial cable (8) is present.
EP83110857A 1982-12-22 1983-10-29 Blocking device for surface waves Expired EP0113818B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110857T ATE46986T1 (en) 1982-12-22 1983-10-29 TUBE BARRIER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3247389 1982-12-22
DE19823247389 DE3247389A1 (en) 1982-12-22 1982-12-22 SHAFT SHAFT LOCK

Publications (3)

Publication Number Publication Date
EP0113818A2 true EP0113818A2 (en) 1984-07-25
EP0113818A3 EP0113818A3 (en) 1986-03-26
EP0113818B1 EP0113818B1 (en) 1989-10-04

Family

ID=6181341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110857A Expired EP0113818B1 (en) 1982-12-22 1983-10-29 Blocking device for surface waves

Country Status (5)

Country Link
EP (1) EP0113818B1 (en)
AT (1) ATE46986T1 (en)
DE (2) DE3247389A1 (en)
DK (1) DK162667C (en)
FI (1) FI76450C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347792A (en) * 1999-03-10 2000-09-13 Andrew Jesman Antenna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2018320A (en) * 1932-06-29 1935-10-22 Rca Corp Radio frequency transmission line
US3320556A (en) * 1963-05-23 1967-05-16 Bell Telephone Labor Inc Impedance transformer
US3680146A (en) * 1970-03-02 1972-07-25 Jerrold Electronics Corp Antenna system with ferrite radiation suppressors mounted on feed line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2018320A (en) * 1932-06-29 1935-10-22 Rca Corp Radio frequency transmission line
US3320556A (en) * 1963-05-23 1967-05-16 Bell Telephone Labor Inc Impedance transformer
US3680146A (en) * 1970-03-02 1972-07-25 Jerrold Electronics Corp Antenna system with ferrite radiation suppressors mounted on feed line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347792A (en) * 1999-03-10 2000-09-13 Andrew Jesman Antenna
GB2347792B (en) * 1999-03-10 2001-06-06 Andrew Jesman Antenna

Also Published As

Publication number Publication date
DK162667C (en) 1992-04-13
ATE46986T1 (en) 1989-10-15
DE3247389C2 (en) 1987-09-03
DK588683A (en) 1984-06-23
DE3380679D1 (en) 1989-11-09
DK588683D0 (en) 1983-12-21
FI834685A (en) 1984-06-23
FI76450B (en) 1988-06-30
FI834685A0 (en) 1983-12-20
DK162667B (en) 1991-11-25
FI76450C (en) 1988-10-10
EP0113818A3 (en) 1986-03-26
DE3247389A1 (en) 1984-07-05
EP0113818B1 (en) 1989-10-04

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