US2547411A - Coupling arrangement between an electron discharge device and cavity resonators - Google Patents

Coupling arrangement between an electron discharge device and cavity resonators Download PDF

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Publication number
US2547411A
US2547411A US627047A US62704745A US2547411A US 2547411 A US2547411 A US 2547411A US 627047 A US627047 A US 627047A US 62704745 A US62704745 A US 62704745A US 2547411 A US2547411 A US 2547411A
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grid
discharge device
cathode
coaxial
coupling arrangement
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US627047A
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William R Rambo
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices

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  • This invention relates generally to electrical apparatus and more particularly to cavity type oscillators.
  • Oscillators which utilize tuned. lines or cavities have been extensively used and are well known to those experienced in the art. When cavities have been used, one method of obtaining feedback has been to cut holes in the walls of the cavities between which feedback is desired. This method is unsatisfactory when it is desired to operate the oscillator over a wide frequency range.
  • the inner conductor in of one coaxial cavity resonator in this instance is connected to the cathode K of the oscillator tube.
  • the tubing ii forms the outer conductor of one coaxial cavity resonator and the inner conductor of the other cavity resonator and is larger in diameter than the grid ring i2 of the oscillator tube.
  • the tubing l3 forms the outer conductor of the other coaxial cavity resonator and in this instance is connected to the plate It of the oscillator tube.
  • Glass envelopes are provided forming an airtight space about the cathode K, grid G and plate P of the tube. The cathode heater and conventional lead-out connections therefrom are not shown.
  • the conductor ll extends beyond the usual point of contact with the grid and is then folded back, contacting the grid by means of fingers I6. Bald fingers are arranged concentrically around the grid ring.
  • grid contacting fingers I! are extended and formed into an 8 shape as shown.
  • the upper portion of the 8 passes through a longitudinal slot in the conductor ii and is connected to the conductor II at one end of the aforementioned slot, thus forming two loops, one loop extending into one cavity resonator and the otherin the second cavity resonator.
  • the "grid contacting fingers iii are made of resilient 'rn'ajterial so that they will be held against the grid ring of the tube by spring action, thus assuring electric contact.
  • the quantity of grid contacting fingers which is formed into feedback loops is determined by the amount of feedback required.
  • This method of feedback provides a low-reactance inductive coupling between the plate and grid circuits of the oscillator.
  • the feed-back loop position is close to the grid plane of the oscillator tube both physically and electrically. Proper feedback is thus achieved over a wide range of frequencies.
  • An ultra high frequency arrangement comprising a tube having a cathode, grid, and anode; inner, intermediate, and outer coaxial conductors forming a pair of coaxial cavity resonators, said inner and outer conductors being coupled to said cathode and said anode respectively, said intermediate conductor being spaced from said grid; and a feedback loop connected between said intermediate conductor and said grid extending into the inner one of said coaxial resonators and arranged to extend into the outer one of said coaxial resonators through an aperture in said intermediate conductor adjacent the connection to said grid.
  • An ultra high frequency arrangement comprising a tube having an aligned cathode, grid, and anode, said grid having an extension about said cathode; inner, intermediate, and outer coaxial conductors forming a pair of coaxial cavity resonators, said inner and outer conductors being coupled to said cathode and anode respectively, said intermediate conductor being spaced from said grid: and a.
  • said grid having an extension about said cathode; inner, intermediate, and outer coaxial conductors forming a pair of coaxial cavity resonators, said inner and outer conductors being coupled to said cathode and anode respectively, said intermediate conductor being spaced from said grid; and an S-shaped feedback loop connected at one end to said intermediate conductor on the side of the inner one of said coaxial resonators and at the other end to said intermediate conductor on the side of the outer one of said coaxial resonators, said loop extending through an aperture in said intermediate conductor adjacent said grid and contacting said grid extension at a point remote from said grid.
  • An ultra high frequency arrangement comprising a vacuum tube including a planar aligned cathode, grid, and anode, said grid including a cylindrical extension about said cathode; three coaxial conducting cylinders arranged concentri- 2o cally, the inner and outer ones of said cylinders being connected to said cathode and anode respectively, the intermediate one of said cylinders being terminated at a point adjacent to and spaced from said grid and including an aper ure substantially in the plane of said grid; and resilient conductors connecting said intermediate cylinder and points on said grid extension remote from said grid and extending into the space between said inner and intermediate cylinders, at least one of said conductors forming an S-shaped loop extending through said aperture into the space between said intermediate and outer cylinders and connected to said intermediate cylinder on the side facing said outer cylinder.

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Description

April 3, 1951 w. R. RAMBO 2 547 411 COUPLING ARRANGEMENT BETWEEN AN ELECTRON DISCHARGE DEVICE AND CAVITY RESONATORS Filed Nov. 6, 1945 I FEEDBACK LOOP INVENTOR WILLIAM R. RAMBO ATTORNEY Patented Apr. 3, 1951 COUPLING ARRANGEMENT BETWEEN AN ELECTRON DISCHARGE DEVICE AND CAVITY RESONATORS William R. Rambo, Cambridge, Mass assignor to the United States of America as represented by the Secretary of War Application November 6, 145,'s'eria1No. 627,047
4 Claims. 1
This invention relates generally to electrical apparatus and more particularly to cavity type oscillators.
Oscillators which utilize tuned. lines or cavities have been extensively used and are well known to those experienced in the art. When cavities have been used, one method of obtaining feedback has been to cut holes in the walls of the cavities between which feedback is desired. This method is unsatisfactory when it is desired to operate the oscillator over a wide frequency range.
It is an object of this invention to provide a means for external feedback in a cavity type oscillator.
It is a further object of this invention to provide feedback means in a cavity type oscillator which operates over a wide frequency range.
Other objects, features and advantage of this invention will suggest themselves to those skilled in the art and will become apparent from the following description of the invention taken in connection with the accompanying drawing in which the single figure is a cross-sectional view of a cavity type oscillator embodying the principles of this invention.
Referring now more particularly to the drawing, a cross section of the coaxial cavity resonator and feedback system is shown. The inner conductor in of one coaxial cavity resonator in this instance is connected to the cathode K of the oscillator tube. The tubing ii forms the outer conductor of one coaxial cavity resonator and the inner conductor of the other cavity resonator and is larger in diameter than the grid ring i2 of the oscillator tube. The tubing l3 forms the outer conductor of the other coaxial cavity resonator and in this instance is connected to the plate It of the oscillator tube. Glass envelopes are provided forming an airtight space about the cathode K, grid G and plate P of the tube. The cathode heater and conventional lead-out connections therefrom are not shown.
The conductor ll extends beyond the usual point of contact with the grid and is then folded back, contacting the grid by means of fingers I6. Bald fingers are arranged concentrically around the grid ring.
Several of the grid contacting fingers I! are extended and formed into an 8 shape as shown. The upper portion of the 8 passes through a longitudinal slot in the conductor ii and is connected to the conductor II at one end of the aforementioned slot, thus forming two loops, one loop extending into one cavity resonator and the otherin the second cavity resonator. The "grid contacting fingers iii are made of resilient 'rn'ajterial so that they will be held against the grid ring of the tube by spring action, thus assuring electric contact. The quantity of grid contacting fingers which is formed into feedback loops is determined by the amount of feedback required.
This method of feedback provides a low-reactance inductive coupling between the plate and grid circuits of the oscillator. The feed-back loop position is close to the grid plane of the oscillator tube both physically and electrically. Proper feedback is thus achieved over a wide range of frequencies.
While there has been described what is at present considered to be the preferred embodiment of this invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention.
What is claimed is:
1. An ultra high frequency arrangement comprising a tube having a cathode, grid, and anode; inner, intermediate, and outer coaxial conductors forming a pair of coaxial cavity resonators, said inner and outer conductors being coupled to said cathode and said anode respectively, said intermediate conductor being spaced from said grid; and a feedback loop connected between said intermediate conductor and said grid extending into the inner one of said coaxial resonators and arranged to extend into the outer one of said coaxial resonators through an aperture in said intermediate conductor adjacent the connection to said grid.
2. An ultra high frequency arrangement comprising a tube having an aligned cathode, grid, and anode, said grid having an extension about said cathode; inner, intermediate, and outer coaxial conductors forming a pair of coaxial cavity resonators, said inner and outer conductors being coupled to said cathode and anode respectively, said intermediate conductor being spaced from said grid: and a. plurality of coupling means and anode, said grid having an extension about said cathode; inner, intermediate, and outer coaxial conductors forming a pair of coaxial cavity resonators, said inner and outer conductors being coupled to said cathode and anode respectively, said intermediate conductor being spaced from said grid; and an S-shaped feedback loop connected at one end to said intermediate conductor on the side of the inner one of said coaxial resonators and at the other end to said intermediate conductor on the side of the outer one of said coaxial resonators, said loop extending through an aperture in said intermediate conductor adjacent said grid and contacting said grid extension at a point remote from said grid.
4. An ultra high frequency arrangement comprising a vacuum tube including a planar aligned cathode, grid, and anode, said grid including a cylindrical extension about said cathode; three coaxial conducting cylinders arranged concentri- 2o cally, the inner and outer ones of said cylinders being connected to said cathode and anode respectively, the intermediate one of said cylinders being terminated at a point adjacent to and spaced from said grid and including an aper ure substantially in the plane of said grid; and resilient conductors connecting said intermediate cylinder and points on said grid extension remote from said grid and extending into the space between said inner and intermediate cylinders, at least one of said conductors forming an S-shaped loop extending through said aperture into the space between said intermediate and outer cylinders and connected to said intermediate cylinder on the side facing said outer cylinder.
WILLIAM R. RAMBO.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PA'IEN'iIPS
US627047A 1945-11-06 1945-11-06 Coupling arrangement between an electron discharge device and cavity resonators Expired - Lifetime US2547411A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902654A (en) * 1955-09-27 1959-09-01 W L Maxson Corp Uhf oscillator
US3027514A (en) * 1951-05-05 1962-03-27 Bird Electronic Corp Electrical wave indicator for high frequency lines

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2287845A (en) * 1939-03-08 1942-06-30 Univ Leland Stanford Junior Thermionic vacuum tube and circuits
US2298949A (en) * 1940-04-20 1942-10-13 Int Standard Electric Corp Radial form ultra-high frequency tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2287845A (en) * 1939-03-08 1942-06-30 Univ Leland Stanford Junior Thermionic vacuum tube and circuits
US2298949A (en) * 1940-04-20 1942-10-13 Int Standard Electric Corp Radial form ultra-high frequency tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027514A (en) * 1951-05-05 1962-03-27 Bird Electronic Corp Electrical wave indicator for high frequency lines
US2902654A (en) * 1955-09-27 1959-09-01 W L Maxson Corp Uhf oscillator

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