GB979768A - Improvements in or relating to microwave filters - Google Patents

Improvements in or relating to microwave filters

Info

Publication number
GB979768A
GB979768A GB2903760A GB2903760A GB979768A GB 979768 A GB979768 A GB 979768A GB 2903760 A GB2903760 A GB 2903760A GB 2903760 A GB2903760 A GB 2903760A GB 979768 A GB979768 A GB 979768A
Authority
GB
United Kingdom
Prior art keywords
cavities
waveguide
cavity
screw
brass
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
GB2903760A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of GB979768A publication Critical patent/GB979768A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer
    • 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
    • H01P1/207—Hollow waveguide filters

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

979,768. Waveguide filters. GENERAL ELECTRIC CO. Ltd., and L. D. TEBBENHAM. Sept. 18, 1961 [Aug. 22, 1960], No. 29037/60. Heading H1W. The cavities of a multiple-cavity waveguide filter are tuned by capacitive elements extending into the cavities at right-angles to the direction of propagation, the dimensions and materials of the elements and their supports being selected to provide a temperature-dependent degree of penetration of the elements whereby changes in dimensions of the cavities with temperature are compensated. As shown, a waveguide cavity 1, made of brass, is tuned by means of a screw 4 made of " Invar " (Registered Trade Mark). The screw is surrounded by conductors 5, 6, made respectively of brass and aluminium, which together with the screw form a half-wavelength coaxial line whereby the short-circuit formed by plate 7 is transferred to the wall of the cavity. The cavities are bounded by shunt susceptances in the form of rows of transverse conductive posts connecting the broad walls of the waveguide. The susceptances are graded to impart desired band-pass characteristics to the filter. The Specification contains a detailed mathematical analysis of the invention.
GB2903760A 1958-11-19 1960-08-22 Improvements in or relating to microwave filters Expired GB979768A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3726458A GB879768A (en) 1958-11-19 1958-11-19 Improvements in or relating to the production of lithographic plates

Publications (1)

Publication Number Publication Date
GB979768A true GB979768A (en) 1965-01-06

Family

ID=10395054

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3726458A Expired GB879768A (en) 1958-11-19 1958-11-19 Improvements in or relating to the production of lithographic plates
GB2903760A Expired GB979768A (en) 1958-11-19 1960-08-22 Improvements in or relating to microwave filters

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB3726458A Expired GB879768A (en) 1958-11-19 1958-11-19 Improvements in or relating to the production of lithographic plates

Country Status (1)

Country Link
GB (2) GB879768A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613989A (en) * 1984-09-28 1986-09-23 Cincinnati Microwave, Inc. Police radar warning receiver
US4686499A (en) * 1984-09-28 1987-08-11 Cincinnati Microwave, Inc. Police radar warning receiver with cantilevered PC board structure
RU2771297C2 (en) * 2017-08-17 2022-04-29 Крео Медикал Лимитед Isolating device for electrosurgical device

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963594A (en) 1975-06-03 1976-06-15 Aluminum Company Of America Electrochemical treatment of aluminum surfaces with an aqueous solution of hydrochloric acid and gluconic acid
US4315806A (en) * 1980-09-19 1982-02-16 Sprague Electric Company Intermittent AC etching of aluminum foil
US4319972A (en) 1980-12-12 1982-03-16 Sprague Electric Company AC Etching of aluminum capacitor foil
DE3217552A1 (en) * 1982-05-10 1983-11-10 Hoechst Ag, 6230 Frankfurt METHOD FOR ELECTROCHEMICALLY Roughening ALUMINUM FOR PRINTING PLATE CARRIERS
DE3217499A1 (en) * 1982-05-10 1983-11-10 Hoechst Ag, 6230 Frankfurt METHOD FOR ELECTROCHEMICALLY Roughening ALUMINUM FOR PRINTING PLATE CARRIERS
DE3503927A1 (en) * 1985-02-06 1986-08-07 Hoechst Ag, 6230 Frankfurt METHOD FOR ELECTROCHEMICALLY Roughening ALUMINUM FOR PRINTING PLATE CARRIERS
DE3503926A1 (en) * 1985-02-06 1986-08-07 Hoechst Ag, 6230 Frankfurt METHOD FOR ELECTROCHEMICALLY Roughening ALUMINUM FOR PRINTING PLATE CARRIERS
DE3533532A1 (en) * 1985-09-20 1987-04-02 Hoechst Ag METHOD FOR ELECTROCHEMICALLY Roughening ALUMINUM FOR PRINTING PLATE CARRIERS
DE3635304A1 (en) * 1986-10-17 1988-04-28 Hoechst Ag METHOD FOR ELECTROCHEMICALLY Roughening ALUMINUM FOR PRINTING PLATE CARRIERS
DE3717654A1 (en) * 1987-05-26 1988-12-08 Hoechst Ag METHOD FOR ELECTROCHEMICALLY Roughening ALUMINUM FOR PRINTING PLATE CARRIERS
DE4001466A1 (en) * 1990-01-19 1991-07-25 Hoechst Ag Electrochemical roughening of aluminium for printing plate mfr. - using combination of mechanical and electrochemical roughening before and/or after main electrochemical roughening stage
DE4129909A1 (en) * 1991-09-09 1993-03-11 Hoechst Ag METHOD FOR Roughening ALUMINUM OR. FROM ALUMINUM ALLOYS AS CARRIER MATERIAL FOR PRINTING PLATES AND A PRINTING PLATE
JPH0939431A (en) * 1995-07-31 1997-02-10 Fuji Photo Film Co Ltd Method of roughening support body for lithographic printing plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613989A (en) * 1984-09-28 1986-09-23 Cincinnati Microwave, Inc. Police radar warning receiver
US4686499A (en) * 1984-09-28 1987-08-11 Cincinnati Microwave, Inc. Police radar warning receiver with cantilevered PC board structure
RU2771297C2 (en) * 2017-08-17 2022-04-29 Крео Медикал Лимитед Isolating device for electrosurgical device

Also Published As

Publication number Publication date
GB879768A (en) 1961-10-11

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