US2730678A - Improvements in interdigital delay lines - Google Patents

Improvements in interdigital delay lines Download PDF

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Publication number
US2730678A
US2730678A US326552A US32655252A US2730678A US 2730678 A US2730678 A US 2730678A US 326552 A US326552 A US 326552A US 32655252 A US32655252 A US 32655252A US 2730678 A US2730678 A US 2730678A
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United States
Prior art keywords
line
fingers
comb
width
combs
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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
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US326552A
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English (en)
Inventor
Dohler Oscar
Epsztein Bernard
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Thales SA
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CSF Compagnie Generale de Telegraphie sans Fil SA
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Application filed by CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P9/00—Delay lines of the waveguide type
    • H01P9/04—Interdigital lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/28—Interdigital slow-wave structures; Adjustment therefor

Definitions

  • the delay rate of such lines is a function solely of the length of'the fingers and of the pitch of the line, that is to say of the distance between the axes of two adjacent fingers. Iffitfis desired to obtain high power from a tube of the type specified hereinabove, it is necessary to provide an electron'be'ani of great width and intensity.
  • a delay line as shown in Fig. 2 is most unsatisfactory United States.
  • Patent 0 ice if not actually useless in the type of tube specified above, for the following reasons: (11)
  • Such a delay line involves troubles as regards lack of uniformity of the direct current electric field between the delay line and a negative electrode parallel thereto, which is usual in the tubes of the crossed-fields type. It will be observed that in the middle part the distance between two consecutive metal surfaces, which corresponds to the surface-to-surface distance from one finger 3 of a comb 1 to an adjacent finger 4 of the other comb 2, is small, while in the side parts there are, along the width b, relatively considerable distances between adjacent fingers 3 of the comb 1 and also between adjacent fingers 4 of the comb 2.
  • the present invention provides improved interdigital delay lines having slight interdigitated fingers but which is nevertheless free from these disadvantages.
  • an interdigital delay line of the above defined slightly interdigitated type, has fingers which are all identical, but which have, in the plane of the combs, stepwise or progressively decreasing width from their extremity which is secured to a comb, to their second extremity which is free.
  • the fingers of an interdigital line are formed from a comb body of afirst prismatic part of rectangular cross-section, and from a second, likewise prismatic part of substantially the same length and of rectangular cross-section, but having a subl stantially smaller area, these two parts having a common face perpendicular to the trajectory of the electrons and the two faces parallel to the trajectory of the electrons.
  • the fingers are in the form of triangular prisms, the base of the prism being carried by the body of the comb, and are inter- 3 leaved in one another in such manner that the distance between two consecutive metal surfaces is substantially constant.
  • Fig. 3 1 and 2 are the bodies of the two combs, one of which carries the fingers 3 and the other the fingers 4.
  • the fingers 3 instead of having a rectangular prismatic shape as shown in Fig. 1, have a first part 6 carried directly by the body of the comb, followed by a second part 7 likewise in the shape of the rectangular prism, substantially of the same length, and the width in the plane of the combs of which is substantially half the width of the part 6.
  • These two prisms have a common face, and two faces which are respectively in line with one another.
  • Such a line is able, like the line shown in Fig. 2, to be coupled with a beam of substantially increased width for the same delay rate, as compared to a line as shown in Fig. 1.
  • experience shows that, contrarily to what happens in the case of the line illustrated in Fig. 2, the high frequency energy is transported, over practically the whole of the width of the line, by waves having abnormal dispersion and the same negative phase velocity.
  • the electron-wave exchange of energy is effected over the entire width of the line under suitable conditions for use in a backwardwave oscillator, which has the result that the output is high, which, as has been seen, is not the case for the line illustrated in Fig. 2.
  • Fig. 4 illustrates another delay line according to the invention.
  • the same references designate the same parts as in Fig. 3.
  • the fingers 3, as in the preceding case, have two parts 6 and 7 substantially of the same length, and likewise in the shape of a rectangular prism, the width in the plane of the combs of the second part being substantially smaller than the width of the first part. But in this case the two faces of the two prisms perpendicular to the electronic trajectories are not in line with one another, but are stepped on both sides. Two shoulders are thus formed.
  • an identical shoulder of a finger of the other comb constructed in identical fashion so that one of the faces perpendicular to the trajectory of the electrons of the second part of this second finger is in line with one of the faces of the first part of the first finger, a zig-zag shaped passage 8 of slight thickness remaining between the two fingers.
  • This delay line has substantially the same advantages as that illustrated in Fig. 3, and behaves towards the direct current electric field of the interaction space substantially in the same manner.
  • the fingers have the shape of triangular prisms, the base of which rests on the body of the corresponding comb.
  • each finger 3 of the comb 1 forms a pair with a finger 4 of the comb 2, said fingers being separated by an oblique passage 9 of constant thickness, whilst the distance between two consecutive pairs 3, 4 is subtantially constant over the entire width of the line.
  • the dimension a is substantially equal to dimension b.
  • Lines according to this invention retain the advantages of not causing disturbance to the lines of force of the electric field in the interaction space while energy is transported by a wave of abnormal dispersion over the entire width of the line.
  • a delay line for a travelling wave tube comprising two combs, each having a series of parallel fingers having a first extremity secured thereto and a second free extremity, the fingers of both combs being reciprocally interdigitated, the distance between said free extremity of each finger of one of said combs and the other comb being of the order of one-third of the total distance between said combs, said fingers having, in the plane of said combs, decreasing width from said first extremity to said second extremity.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Particle Accelerators (AREA)
US326552A 1951-12-29 1952-12-17 Improvements in interdigital delay lines Expired - Lifetime US2730678A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR931294X 1951-12-29

Publications (1)

Publication Number Publication Date
US2730678A true US2730678A (en) 1956-01-10

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US326552A Expired - Lifetime US2730678A (en) 1951-12-29 1952-12-17 Improvements in interdigital delay lines

Country Status (5)

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US (1) US2730678A (fr)
BE (1) BE516428A (fr)
DE (1) DE931294C (fr)
FR (1) FR1047386A (fr)
GB (1) GB738405A (fr)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872650A (en) * 1956-02-16 1959-02-03 Monogram Prec Ind Inc Waveguide
US2876373A (en) * 1956-03-01 1959-03-03 Siemens Ag Magnet system for the focusing of electron beams
US2881348A (en) * 1952-12-19 1959-04-07 Csf Delay line for traveling wave tubes
US2889488A (en) * 1954-05-13 1959-06-02 Csf Delay lines for crossed field tubes
US2896117A (en) * 1955-02-28 1959-07-21 Hughes Aircraft Co Linear magnetron traveling wave tube
US2919375A (en) * 1955-06-10 1959-12-29 Csf Backward wave traveling wave tubes
US2925516A (en) * 1956-06-28 1960-02-16 Gen Electric Traveling wave tube
US2926280A (en) * 1956-04-23 1960-02-23 Raytheon Co Traveling wave structures
US2951964A (en) * 1955-09-13 1960-09-06 Bell Telephone Labor Inc Electron beam systems
US2993143A (en) * 1955-12-30 1961-07-18 High Voltage Engineering Corp Waveguide structure for microwave linear electron accelerator
US3005128A (en) * 1957-10-18 1961-10-17 Edgerton Germeshausen And Grie Electron-beam deflection system
US3064159A (en) * 1958-05-09 1962-11-13 Patelhold Patentverwertung Microwave tube with interdigital electrode construction
US3086180A (en) * 1958-02-27 1963-04-16 Csf Delay line for travelling wave tubes
US3099766A (en) * 1960-11-02 1963-07-30 Siemens Ag High capacity travelling wave tube for amplifying ultra high frequencies
US3169210A (en) * 1958-05-05 1965-02-09 Raytheon Co Traveling wave tube with notched interdigital slow wave structure
US3387234A (en) * 1961-09-27 1968-06-04 Csf Delay line structure
US3953759A (en) * 1975-03-20 1976-04-27 Varian Associates Interdigital slow wave circuit for electron tubes
US4381475A (en) * 1979-10-13 1983-04-26 Thomson - Csf Variable coupling resistance delay line for crossed field tube
DE19944331B4 (de) * 1999-09-15 2006-03-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Mikrosensoranordnung zur Positionsmessung von Flüssigkeiten in Kapillaren
CN107910238A (zh) * 2017-11-24 2018-04-13 电子科技大学 一种适用于多注集成梳齿型慢波结构的能量过渡系统
CN111276779A (zh) * 2020-02-19 2020-06-12 中天宽带技术有限公司 微带低通滤波器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL286727A (fr) * 1962-01-03
US5150436A (en) * 1991-09-06 1992-09-22 The University Of British Columbia Slow-wave electrode structure
CN109300753B (zh) * 2018-10-08 2021-01-26 电子科技大学 一种介质支撑的慢波结构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532545A (en) * 1945-03-08 1950-12-05 Everhart Edgar Magnetron oscillator
US2617936A (en) * 1949-01-11 1952-11-11 Sperry Corp Delay lens for microwaves

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532545A (en) * 1945-03-08 1950-12-05 Everhart Edgar Magnetron oscillator
US2617936A (en) * 1949-01-11 1952-11-11 Sperry Corp Delay lens for microwaves

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881348A (en) * 1952-12-19 1959-04-07 Csf Delay line for traveling wave tubes
US2889488A (en) * 1954-05-13 1959-06-02 Csf Delay lines for crossed field tubes
US2896117A (en) * 1955-02-28 1959-07-21 Hughes Aircraft Co Linear magnetron traveling wave tube
US2919375A (en) * 1955-06-10 1959-12-29 Csf Backward wave traveling wave tubes
US2951964A (en) * 1955-09-13 1960-09-06 Bell Telephone Labor Inc Electron beam systems
US2993143A (en) * 1955-12-30 1961-07-18 High Voltage Engineering Corp Waveguide structure for microwave linear electron accelerator
US2872650A (en) * 1956-02-16 1959-02-03 Monogram Prec Ind Inc Waveguide
US2876373A (en) * 1956-03-01 1959-03-03 Siemens Ag Magnet system for the focusing of electron beams
US2926280A (en) * 1956-04-23 1960-02-23 Raytheon Co Traveling wave structures
US2925516A (en) * 1956-06-28 1960-02-16 Gen Electric Traveling wave tube
US3005128A (en) * 1957-10-18 1961-10-17 Edgerton Germeshausen And Grie Electron-beam deflection system
US3086180A (en) * 1958-02-27 1963-04-16 Csf Delay line for travelling wave tubes
US3169210A (en) * 1958-05-05 1965-02-09 Raytheon Co Traveling wave tube with notched interdigital slow wave structure
US3064159A (en) * 1958-05-09 1962-11-13 Patelhold Patentverwertung Microwave tube with interdigital electrode construction
US3099766A (en) * 1960-11-02 1963-07-30 Siemens Ag High capacity travelling wave tube for amplifying ultra high frequencies
US3387234A (en) * 1961-09-27 1968-06-04 Csf Delay line structure
US3953759A (en) * 1975-03-20 1976-04-27 Varian Associates Interdigital slow wave circuit for electron tubes
US4381475A (en) * 1979-10-13 1983-04-26 Thomson - Csf Variable coupling resistance delay line for crossed field tube
DE19944331B4 (de) * 1999-09-15 2006-03-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Mikrosensoranordnung zur Positionsmessung von Flüssigkeiten in Kapillaren
CN107910238A (zh) * 2017-11-24 2018-04-13 电子科技大学 一种适用于多注集成梳齿型慢波结构的能量过渡系统
CN111276779A (zh) * 2020-02-19 2020-06-12 中天宽带技术有限公司 微带低通滤波器

Also Published As

Publication number Publication date
BE516428A (fr)
FR1047386A (fr) 1953-12-14
DE931294C (de) 1955-08-04
GB738405A (en) 1955-10-12

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