US2920295A - Device for ventilating wave-guide systems - Google Patents

Device for ventilating wave-guide systems Download PDF

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Publication number
US2920295A
US2920295A US649733A US64973357A US2920295A US 2920295 A US2920295 A US 2920295A US 649733 A US649733 A US 649733A US 64973357 A US64973357 A US 64973357A US 2920295 A US2920295 A US 2920295A
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wave
waveguide
ventilating
guide
guide systems
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US649733A
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Allaries Hans
Calon Arnold Edmond Marie
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/30—Auxiliary devices for compensation of, or protection against, temperature or moisture effects ; for improving power handling capability

Definitions

  • This invention relates to devices for Ventilating waveguid, systems.
  • Wave-guide systems in permanent arrangements such as, for example, in radar installations or beam transmitter stations, it is frequently necessary to take steps in order that dried and/or heated air or a neutral gas, for example nitrogen, may be blown into the waveguide system to avoid corrosion and condensation of Water vapour.
  • the gas container or the drying and/or heating installations of the air to be blown into the system must be connected somewhere at the beginning or the end of the wave-guide system.
  • the couplings concerned are required to affect the electric field configurations as little as possible. This may be achieved in known manner by choosing the coupling holes or slots to be comparatively small with respect to the wavelength of the waves in the wave-guide. For very high frequencies such, for example, as correspond to millimetre waves, the coupling holes must, however, be so small as to constitute a considerable resistance to flow, so that insufiicient gas or air can flow through the wave-guide.
  • a directional coupling known per se is provided, at least one coupling opening being provided in the adjacent side-walls of the wave guides such that wave energy supplied via a given extremity of one wave guide is discharged completely through a given extremity of the other wave guide, and conversely.
  • the other extremity of one Wave guide is coupled to guides G1 and G2 has provided in it a coupling opening KG, which is so proportioned that wave energy supplied via the end A is transferred completely via the coupling opening KG to the wave guide G2 and may be discharged via the end B.
  • the coupling factor of such a directional coupling may be equal to unity in a comparatively broad frequency range, for example a relatve variation of 15%, that is to say that substantially no energy is transferred vto .the arms C and D of the direc- Patented Jan. 5, 1960 ICC tional coupling and these arms thus are electrically neutral.
  • the wave-guide system for example a gas ycontainer or an air pump, if desired further means being provided for drying and/or heating the blow air.
  • the arm D of wave guide G1 is shut off in a gas-tight manner by means of a wall or piston Z, which wall also prevents escapement of any high-frequency energy via the arm D.
  • the blow air is thus led via the arm B to the aerial and via the coupling opening KG and the arm A of wave-guide G1 to the transmitter.
  • the coupling opening KG has only a very small resistance with respect to the air ow.
  • the wave pipe C is preferably not narrowed, but a thin metallic partition S is arranged at the centre thereof, as shown in the drawing.
  • a device for Ventilating a waveguide system comprising first and second hollow pipe waveguides, means for supplying electrical wave energy into an end of said first waveguide, means providing at least one hollow electrical coupling from a side of said first waveguide to a side of said second waveguide thereby providing a directional coupling whereby said wave energy is discharged at an end of said second waveguide, means connected to the remaining end of said second waveguide for inducing gas into said system, means closing the remaining end of said first waveguide in a gas-tight manner, and means preventing escape of said wave energy through said remaining end of said second waveguide comprising a metallic partition centrally disposed in said remaining end of said second waveguide and extending longitudinally therewith.
  • a device for Ventilating a waveguide system comprising first and second hollow pipe waveguides positioned side-by-side along at least a portion of the lengths thereof thereby providing a common sidewall, means for supplying electrical wave energy into an end of said first waveguide, means connected to a corresponding end of said second waveguide for inducing gas into said system, said common sidewall containing at least one aperture thereby providing a directional coupling whereby said wave energy is discharged at the remaining end of said second waveguide, means closing the remaining end of said first waveguide in a gas-tight manner, and means preventing escape of said wave energy through said corresponding end of said second waveguide comprising a metallic partition centrally disposed in said corresponding end of said second waveguide and extending longitudinally therewith.

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  • Constitution Of High-Frequency Heating (AREA)

Description

DEVICE FOR VENTILATING WAVE-GUIDE SYSTEMS Filed April 1. 1957 AGEN United States Patent DEVICE FOR VENTILATING WAVE-GUIDE SYSTEMS Application April 1, 1957, Serial No. 649,733
Claims priority, application Netherlands April 19, 1956 2 Claims. (Cl. S33-98) This invention relates to devices for Ventilating waveguid, systems.
For Wave-guide systems in permanent arrangements such as, for example, in radar installations or beam transmitter stations, it is frequently necessary to take steps in order that dried and/or heated air or a neutral gas, for example nitrogen, may be blown into the waveguide system to avoid corrosion and condensation of Water vapour. The gas container or the drying and/or heating installations of the air to be blown into the system must be connected somewhere at the beginning or the end of the wave-guide system. The couplings concerned are required to affect the electric field configurations as little as possible. This may be achieved in known manner by choosing the coupling holes or slots to be comparatively small with respect to the wavelength of the waves in the wave-guide. For very high frequencies such, for example, as correspond to millimetre waves, the coupling holes must, however, be so small as to constitute a considerable resistance to flow, so that insufiicient gas or air can flow through the wave-guide.
In the device according to the invention for Ventilating wave-guide systems, a directional coupling known per se is provided, at least one coupling opening being provided in the adjacent side-walls of the wave guides such that wave energy supplied via a given extremity of one wave guide is discharged completely through a given extremity of the other wave guide, and conversely. Furthermore,
the other extremity of one Wave guide is coupled to guides G1 and G2 has provided in it a coupling opening KG, which is so proportioned that wave energy supplied via the end A is transferred completely via the coupling opening KG to the wave guide G2 and may be discharged via the end B. The coupling factor of such a directional coupling may be equal to unity in a comparatively broad frequency range, for example a relatve variation of 15%, that is to say that substantially no energy is transferred vto .the arms C and D of the direc- Patented Jan. 5, 1960 ICC tional coupling and these arms thus are electrically neutral. taining a gas flow in the wave-guide system, for example a gas ycontainer or an air pump, if desired further means being provided for drying and/or heating the blow air. The arm D of wave guide G1 is shut off in a gas-tight manner by means of a wall or piston Z, which wall also prevents escapement of any high-frequency energy via the arm D. The blow air is thus led via the arm B to the aerial and via the coupling opening KG and the arm A of wave-guide G1 to the transmitter. As a matter of fact, the coupling opening KG has only a very small resistance with respect to the air ow. In order to prevent wave energy from escaping via the arm C or leaking in via the pump, it may be desirable for the dimensions of the pipe concerned to be chosen such that travelling waves cannot occur therein, which on the other hand has the disadvantage that the resistance to ow s increased. Consequently, the wave pipe C is preferably not narrowed, but a thin metallic partition S is arranged at the centre thereof, as shown in the drawing.
What is claimed is:
l. A device for Ventilating a waveguide system, comprising first and second hollow pipe waveguides, means for supplying electrical wave energy into an end of said first waveguide, means providing at least one hollow electrical coupling from a side of said first waveguide to a side of said second waveguide thereby providing a directional coupling whereby said wave energy is discharged at an end of said second waveguide, means connected to the remaining end of said second waveguide for inducing gas into said system, means closing the remaining end of said first waveguide in a gas-tight manner, and means preventing escape of said wave energy through said remaining end of said second waveguide comprising a metallic partition centrally disposed in said remaining end of said second waveguide and extending longitudinally therewith.
2. A device for Ventilating a waveguide system, comprising first and second hollow pipe waveguides positioned side-by-side along at least a portion of the lengths thereof thereby providing a common sidewall, means for supplying electrical wave energy into an end of said first waveguide, means connected to a corresponding end of said second waveguide for inducing gas into said system, said common sidewall containing at least one aperture thereby providing a directional coupling whereby said wave energy is discharged at the remaining end of said second waveguide, means closing the remaining end of said first waveguide in a gas-tight manner, and means preventing escape of said wave energy through said corresponding end of said second waveguide comprising a metallic partition centrally disposed in said corresponding end of said second waveguide and extending longitudinally therewith.
References Cited in the file of this patent UNITED STATES PATENTS 2,709,241 Ribiet May 24, 1955 2,721,309 Seidel oct. is, s 2,783,449 Loviek Peb. 26, 1951 The arm C is connected to a device for mainv
US649733A 1956-04-19 1957-04-01 Device for ventilating wave-guide systems Expired - Lifetime US2920295A (en)

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NL2920295X 1956-04-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124357A2 (en) * 1983-04-28 1984-11-07 Kabushiki Kaisha Toshiba Open waveguide electromagnetic wave radiator for heating a plasma
US20110006854A1 (en) * 2008-03-17 2011-01-13 Takayuki Oyama Waveguide coupler

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709241A (en) * 1950-02-28 1955-05-24 Raytheon Mfg Co Hybrid directional coupler
US2721309A (en) * 1951-06-18 1955-10-18 Itt Directional couplers for microwave transmission systems
US2783440A (en) * 1955-01-26 1957-02-26 Lockheed Aircraft Corp Light weight wave guide construction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709241A (en) * 1950-02-28 1955-05-24 Raytheon Mfg Co Hybrid directional coupler
US2721309A (en) * 1951-06-18 1955-10-18 Itt Directional couplers for microwave transmission systems
US2783440A (en) * 1955-01-26 1957-02-26 Lockheed Aircraft Corp Light weight wave guide construction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124357A2 (en) * 1983-04-28 1984-11-07 Kabushiki Kaisha Toshiba Open waveguide electromagnetic wave radiator for heating a plasma
EP0124357A3 (en) * 1983-04-28 1986-04-16 Kabushiki Kaisha Toshiba Open waveguide electromagnetic wave radiator for heating a plasma
US4735764A (en) * 1983-04-28 1988-04-05 Kabushiki Kaisha Toshiba Open waveguide electromagnetic wave radiator for secondary heating a plasma in a nuclear fusion reactor
US20110006854A1 (en) * 2008-03-17 2011-01-13 Takayuki Oyama Waveguide coupler

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