US3509496A - Liquid power-absorbing loads - Google Patents

Liquid power-absorbing loads Download PDF

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Publication number
US3509496A
US3509496A US743211A US3509496DA US3509496A US 3509496 A US3509496 A US 3509496A US 743211 A US743211 A US 743211A US 3509496D A US3509496D A US 3509496DA US 3509496 A US3509496 A US 3509496A
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US
United States
Prior art keywords
power
liquid
insert
tank
waveguide
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
Application number
US743211A
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English (en)
Inventor
Paul Stanley Griffin
David Roy Hill
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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 Marconi Co Ltd filed Critical Marconi Co Ltd
Application granted granted Critical
Publication of US3509496A publication Critical patent/US3509496A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/10—Safety devices, e.g. by-passes
    • B01D27/103—Bypass or safety valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/10—Safety devices, e.g. by-passes
    • B01D27/106—Anti-leakage or anti-return valves

Definitions

  • a light power absorbing load consists of a low loss dielectric insulating insert in a tank.
  • the tank is larger than the insert so that liquid in the tank has access to the surface of the insert.
  • the insert thus serves to guide radio frequency power to the liquid in the tank.
  • This invention relates to liquid power-absorbing loads and whilst primarily concerned with liquid power-absorbing loads for absorbing unwanted power it is also applicable to liquid power-absorbing loads for measuring power by calorimetric effects.
  • the usual liquid power-absorbing load consists of a length of waveguide, normally some two or three feet long, with a glass tube running down the middle of it, power-absorbing liquid (usually water) being pumped through the tube via input and output water connections at its end.
  • power-absorbing liquid usually water
  • the glass tube itself mounted in this position, necessarily fragile but the water connections which pass through the waveguide to its exterior are also liable to be broken.
  • Another defect is that there is a tendency for steam to be evolved in the conduit and if this happens it may seriously impair the powerabsorbing capabilities of the load.
  • the present invention seeks to provide improved liquid power-absorbing loads in which the foregoing disadvantages are overcome or reduced.
  • a liquid power-absorbing load comprises a low loss dielectric insulating insert in a tank the volume of which is large relative to the volume of said insert and the liquid in which has free access to the surface of the insert inside the tank, said insert serving to guide radio frequency power to the liquid in the tank.
  • the insert is within a length of perforated waveguide which is inside the tank, the perforations providing the liquid in the tank with free access to the surface of the insert in said tank.
  • said body is of tapered form to provide a suitable shape for boundary of the liquid to which the power to be absorbed is applied.
  • the body extends into the tank from Within a choke waveguide section which is sealed into one wall of the liquid container.
  • a transformer wave guide section is preferably interposed between the choke waveguide section and the rectangular waveguide in order to achieve good matching.
  • the liquid container may be open to the atmosphere but in practice the container pefeably is sealed and a vapour condenser is provided to condense any vapour evolved as a result of a rise in temperature of the liquid and return the vapour as liquid to said container.
  • the load may be employed simply to abesorb unwanted power or it may be used as a calorimetric power measuring device.
  • the load consists of a Cheby cheff waveguide transformer section 1 which is stepped in its E dimension only.
  • the input end 2 of the transformer section 1 is provided with a rectangular flange to which a rectangular waveguide (not shown) transmitting radiofrequency power to be absorbed in the load may be attached.
  • the waveguide transformer section 1 feeds into a dielectric filled choke section 3 which is sealed into the wall of a water-filled tank 4. Extending into the tank 4 form within the choke section 3 is a generally rectangular sectioned tapered insert 5 of P.T.F.E. or other low loss dielectric insulating material which reduces in cross-section, as shown, along its length from the choke section 3 to maintain a suitable shape for the boundary of the water to which the RF.
  • the insert 5 is surrounded by a length of rectangular waveguide 6 all four walls of which are perforated to provide the water in the tank with free access to the surface of the insert 5. Sealing against water from the tank 4 entering the transformer section 1 along the tapered insert 5 is provided by O-rings shown at 7.
  • the tank 4 may be open to the air so that any steam evolved may freely escape or it may be sealed and a steam condenser 8 provided to condense any steam and return it to the tank as water.
  • a power absorbing load arrangement comprising a container, a liquid within said container, a low loss dielectric insert in said container, and a length of perforated waveguide inside said container and surrounding said insert, the volume of asid container being large relative to the volume of said insert, and said liquid having free access to the surface of the insert inside the container through said length of perforated waveguide, whereby the insert serves to guide radio frequency power to the liquid in the container.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Non-Reversible Transmitting Devices (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US743211A 1967-07-10 1968-07-08 Liquid power-absorbing loads Expired - Lifetime US3509496A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31686/67A GB1176952A (en) 1967-07-10 1967-07-10 Improvements in or relating to Liquid Power-Absorbing Loads

Publications (1)

Publication Number Publication Date
US3509496A true US3509496A (en) 1970-04-28

Family

ID=10326886

Family Applications (1)

Application Number Title Priority Date Filing Date
US743211A Expired - Lifetime US3509496A (en) 1967-07-10 1968-07-08 Liquid power-absorbing loads

Country Status (5)

Country Link
US (1) US3509496A (de)
DE (1) DE1766722B1 (de)
FR (1) FR1574348A (de)
GB (1) GB1176952A (de)
SE (1) SE347601B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597708A (en) * 1969-12-31 1971-08-03 Raytheon Co Broadband radio frequency transmission line termination
US4638268A (en) * 1983-11-08 1987-01-20 Ngk Spark Plug Co., Ltd. Microwave absorber comprised of a dense silicon carbide body which is water cooled
US4799031A (en) * 1986-12-02 1989-01-17 Spinner Gmbh, Elektrotechnische Fabrik Waveguide device for producing absorption or attenuation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432094A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Impedance transformer for wave guides
US2958830A (en) * 1954-10-04 1960-11-01 Bird Electronic Corp Coaxial line load device
GB908808A (en) * 1959-09-24 1962-10-24 Ass Elect Ind Waveguide coupling arrangement
US3360750A (en) * 1965-07-23 1967-12-26 Varian Associates High frequency waveguide load comprising a dielectric window in contact with lossy coolant fluid

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB491794A (en) * 1937-03-06 1938-09-06 Joseph Lade Pawsey Improvements in or relating to load resistances or the like for high frequency alternating currents
GB695166A (en) * 1950-07-25 1953-08-05 Bird Electronic Corp Improvements relating to high-frequency line termination devices
US3289109A (en) * 1965-07-23 1966-11-29 Varian Associates High frequency waveguide waterload for electromagnetic wave energy with flow channel having wedge shaped internal geometry

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432094A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Impedance transformer for wave guides
US2958830A (en) * 1954-10-04 1960-11-01 Bird Electronic Corp Coaxial line load device
GB908808A (en) * 1959-09-24 1962-10-24 Ass Elect Ind Waveguide coupling arrangement
US3360750A (en) * 1965-07-23 1967-12-26 Varian Associates High frequency waveguide load comprising a dielectric window in contact with lossy coolant fluid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597708A (en) * 1969-12-31 1971-08-03 Raytheon Co Broadband radio frequency transmission line termination
US4638268A (en) * 1983-11-08 1987-01-20 Ngk Spark Plug Co., Ltd. Microwave absorber comprised of a dense silicon carbide body which is water cooled
US4799031A (en) * 1986-12-02 1989-01-17 Spinner Gmbh, Elektrotechnische Fabrik Waveguide device for producing absorption or attenuation

Also Published As

Publication number Publication date
DE1766722B1 (de) 1970-11-26
SE347601B (de) 1972-08-07
FR1574348A (de) 1969-07-11
GB1176952A (en) 1970-01-07

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