EP0113818A2 - Dispositif de blocage d'ondes de surface - Google Patents

Dispositif de blocage d'ondes de surface 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
Authority
EP
European Patent Office
Prior art keywords
coaxial cable
piece
wave
metal clamp
frequency range
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.)
Granted
Application number
EP83110857A
Other languages
German (de)
English (en)
Other versions
EP0113818B1 (fr
EP0113818A3 (en
Inventor
Dieter Dipl.-Phys. Schenkyr
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.)
Richard Hirschmann & Co Te Esslingen Bondsr GmbH
Original Assignee
HIRSCHMANN RADIOTECHNIK
Hirschmann Electronics GmbH and Co KG
Richard Hirschmann Radiotechnisches Werk
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 HIRSCHMANN RADIOTECHNIK, Hirschmann Electronics GmbH and Co KG, Richard Hirschmann Radiotechnisches Werk filed Critical HIRSCHMANN RADIOTECHNIK
Priority to AT83110857T priority Critical patent/ATE46986T1/de
Publication of EP0113818A2 publication Critical patent/EP0113818A2/fr
Publication of EP0113818A3 publication Critical patent/EP0113818A3/de
Application granted granted Critical
Publication of EP0113818B1 publication Critical patent/EP0113818B1/fr
Expired legal-status Critical Current

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Classifications

    • 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.
EP83110857A 1982-12-22 1983-10-29 Dispositif de blocage d'ondes de surface Expired EP0113818B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110857T ATE46986T1 (de) 1982-12-22 1983-10-29 Mantelwellensperre.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3247389 1982-12-22
DE19823247389 DE3247389A1 (de) 1982-12-22 1982-12-22 Mantelwellensperre

Publications (3)

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

Family

ID=6181341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110857A Expired EP0113818B1 (fr) 1982-12-22 1983-10-29 Dispositif de blocage d'ondes de surface

Country Status (5)

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

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

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