[go: up one dir, main page]

US2740094A - Wave-guide impedance elements - Google Patents

Wave-guide impedance elements Download PDF

Info

Publication number
US2740094A
US2740094A US266179A US26617952A US2740094A US 2740094 A US2740094 A US 2740094A US 266179 A US266179 A US 266179A US 26617952 A US26617952 A US 26617952A US 2740094 A US2740094 A US 2740094A
Authority
US
United States
Prior art keywords
aperture
guide
resonant
frequency
partition
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
US266179A
Inventor
Arthur G Fox
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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
Priority to BE468045D priority Critical patent/BE468045A/xx
Priority to NL73887D priority patent/NL73887C/xx
Priority claimed from US452851A external-priority patent/US2432093A/en
Priority to GB22914/45A priority patent/GB578617A/en
Priority to GB18433/43A priority patent/GB578597A/en
Priority to US610957A priority patent/US2434645A/en
Priority to US610956A priority patent/US2607850A/en
Priority to US612680A priority patent/US2503549A/en
Priority to US612681A priority patent/US2422191A/en
Priority to US614935A priority patent/US2432094A/en
Priority to US614937A priority patent/US2434646A/en
Priority to US614936A priority patent/US2530691A/en
Priority to CH265036D priority patent/CH265036A/en
Priority to FR938693D priority patent/FR938693A/en
Priority to US789811A priority patent/US2588226A/en
Priority to DEP28888A priority patent/DE818384C/en
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US266179A priority patent/US2740094A/en
Publication of US2740094A publication Critical patent/US2740094A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters
    • 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
    • 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
    • H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
    • H01P5/024—Transitions between lines of the same kind and shape, but with different dimensions between hollow waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave

Definitions

  • This invention relates to guided electromagnetic wave transmission and more particularly to impedance elements for wave guides.
  • This application is a division of application Serial No. 610,956, filed August 17, 1945, now Patent 2,607,850, issued August 19, 1952, which, in turn, is a division of application Serial No. 452,851, filed July 30, 1942, now Patent 2,432,093, issued December 9, 1947.
  • An object of the invention is to provide series-resonant impedance branches and parallel-resonant impedance branches for use in Wave guides.
  • Another object of the invention is to provide means for tuning such resonant impedance branches.
  • a uniform metallic sheath with or without a dielectric filler will serve as a guide for suitable electromagnetic waves.
  • the sheath may be circular, rectangular, or of other shape.
  • the guide acts like a transmission line and has a specific propagation constant and characteristic impedance. For any particular frequency there are an infinite number of cross-sectional sizes and shapes of guide which will have the same characteristic impedance.
  • Shunt reactive elements are obtained by placing partial obstructions across the wave guide.
  • a shunt reactive element may be provided by a transverse metal partition having a slit therein which extends substantially from one side to the other. If the slit is perpendicular to the direction of polarization of the electric field the element is primarily capacitive, and if parallel with the field the element is primarily inductive.
  • an aperture in a transverse partition in a wave guide is proportioned to provide both inductive and capacitive components in the right amounts to resonate at a particular frequency.
  • the resonance thus produced may be either of the parallel type, offering a high shunt impedance across the guide, or of the series type, offering a low shunt impedance.
  • a rectangular aperture may be proportioned for parallel resonance or, if made sufficiently narrow, for series resonance.
  • the resonance may be sharpened by providing inwardly extending projections on opposite sides of the opening. A wider opening may be used if the opposed edges of the aperture are made thicker, or if the two halves of the partition are made to overlap.
  • the resonant frequency may be controlled by adjusting an effective dimension of the aperture or by controlling its eiiective configuration.
  • Figs. 1 and 2 are perspective views of wave guides having therein partitions with apertures which provide reactive elements;
  • Fig. 3 shows a wave-guide termination employing a parallel-resonant element
  • Fig. 4 shows an impedance element in accordance with the invention that may be adjusted for either parallel or series resonance
  • Figs. 5 and 6 show series-resonant elements in accordance with the invention.
  • Fig. 1 is a perspective view of a section of a metallic wave guide 1 in the form of a rectangular sheath which has, been crosssectioned just ahead of the transverse metallic partition comprising an upper portion 2 and a lower portion 3 with an aperture 4 therebetween extending from one side of the guide to the other.
  • the guide 1 is carrying dominant transverse electric waves with the electric field E polarized in a direction perpendicular to the length of the aperture 4, as indicated by the arrow, the partition will provide a shunt capacitive reactance. The magnitude of this reactance depends upon the width of the aperture 4 in the direction of the electric field E and decreases as the Width is decreased.
  • Fig. 2 is similar to Fig. 1 except that the aperture 4 extends from the top to the bottom of the guide 1 and has its length parallel to the direction of the electric field E.
  • a partition of this type provides a shunt inductive reactance, the magnitude of which also decreases as the width of the aperture 4 decreases.
  • a partition in a wave guide may be made to provide both inductive and capacitive components in the right amounts to resonate at a particular frequency. This may be either a parallel resonance or a series resonance.
  • Fig. 3 shows a parallel-resonant element, that is, one providing a high shunt impedance, in a rectangular wave guide 1.
  • the partition 11 has a symmetrically placed aperture 12 having a height V in a direction parallel to the. electric field E and a width W perpendicular thereto. There are an infinite number of different apertures which will produce parallel resonance but, once either the height V or the width W has been chosen, the other dimension is thereby determined.
  • the line 13 gives the locus of the upper right-hand corner 14 of all possible rectangular apertures that will provide parallel resonance in the. wave guide 1. Such an element placed in the guide. and followed by a solid metallic partition such as 15 placed one-quarter of a wavelength behind the element 11 will serve as a reflectionless termination for the guide 1.
  • Fig. 4 shows a circular guide 7 having therein an impedance element which may be adjusted for either parallel resonance or series resonance.
  • the partition 16 has a rectangular aperture into which project a pair of threaded studs 17 having their axes along a diameter of the guide 7 and parallel to the electric field E.
  • the two internally threaded sleeves 18, each with a circular metal plate 19 fastened to one end, may be screwed onto the studs 17.
  • the separation between the plates 19, and therefore the resonant frequency of the element may thus be adjusted as desired.
  • For series resonance only a small separation is required.
  • parallel resonance the spacing will be greater, and in this case the plates 19 may not be required.
  • Fig. 5 shows an element more particularly adapted for series resonance, providing a low shunt impedance.
  • the partition 16 has a symmetrical aperture 20 having its length perpendicular ot the electric field E and its width constricted toward the center by means of the inwardly extending projections 21 and 22, to which are attached, on opposite sides of the partition 16, two overlapping metal flaps 23 and 24. These flaps 23 and 24 may be bent toward or away from each other to adjust the spacing.
  • Fig. 6 shows a modification'of the series-resonant element of Fig. in which the flaps 23 and 24 are replaced by two opposing metallic plates 25 and 26 which are perpendicular to the partition 16 and attached to the ends of the projections 21 and 22. 7
  • partitions be secured to the walls of the guide by soldering, welding, or in some other appropriate manner such that a good electrical contact is obtained. It should also be noted that thinner partitions than those shown in the drawings will, under some circumstances, produce more satisfactory results. The partitions have been shown thicker in the drawings only in the interest of clarity. In Figs. 3, 4, 5 and 6 a portion of the wave guide has been cut away to show the partitions more clearly.
  • a conductively sheathed wave guide means for establishing electromagnetic waves therein, a transverse partition within said guide, said partition having an aperture which is resonant at the frequency of said waves, two opposite projections and opposed plates at the inner ends thereof which constrict the width of said aperture and form a comparatively narrow central opening and a wider opening at each end thereof, and means for adjusting the spacing between said plates.
  • a hollow-pipe wave guide a conductive transverse partition therein, said partition containing an aperture which is dimensioned for resonance at a frequency freely transmissible by said guide, a pair of opposed projections extending from opposite sides of said aperture to form a comparatively narrow central opening and a wider opening at each end thereof, means for increasing the capacitance between the inner ends of said projections, and means for adjusting an effective dimension of said aperture to control the frequency at which said aperture is resonant.
  • a conductively sheathed guide for for the transmission of electromagnetic waves, a partition transversely disposed at a point in said guide, said partition containing an aperture dimensioned to provide at said i point a shunt impedance which is resonant at a frequency transmissible by said guide, a pair of opposed projections extending from opposite sides of said aperture in a direction parallel to the electric field of said Waves to form a comparatively narrow central opening and a wider opening at each end thereof, means for increasing the capacitance between the inner ends of said projections, and means for adjusting the effective configuration of said aperture to adjust said resonant frequency.
  • a conductively sheathed guide for the transmission of electromagnetic Waves and a partition transversely disposed in said guide, said partition having an aperture which is resonant at a frequency transmissible by said guide, and said aperture comprising a comparatively narrow, adjustable central opening and a wider opening at each end thereof.
  • a metallic pipe-shaped wave guide means for establishing electromagnetic waves therein, a partition substantially perpendicular to the direction of propagation of said waves, said partition being provided with an aperture which is resonant at the frequency of said waves, a pair of opposite projections and opposed plates at the inner ends thereof which constrict the width of said aperture in a direction parallel to the electric field of said waves and form a comparatively narrow central opening and a wider opening at each end thereof, and means for adjusting the spacing between said plates.
  • a hollow-pipe wave guide means for establishing electromagnetic waves therein, a metallic wall member associated with said guide, said member being positioned transversely to the direction of wave I propagation through said guide and having an opening which is resonant at the frequency of said waves, a pair of opposed projections extending into said opening from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof,
  • a pipe-like wave guide means for establishing electromagnetic waves therein, a wall member substantially perpendicular to the longitudinal axis of said guide, said member having an aperture dimensioned to be resonant at the frequency of said waves, a pair of opposed projections extending into said aperture from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof, a pair of opposed plates connected, respectively, to the inner ends of said projections, and means for controlling an effective dimension of said aperture to control said resonant frequency.
  • a wave guide of the hollow-pipe type exciting means for establishing electromagnetic waves therein, a metallic Wall positioned in said guide, said wall lying in a plane substantially transverse to the direction of propagation of said waves and being provided with an aperture which is resonant at the frequency of said exciting means, a pair of opposed projections extending into said aperture from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof, means at the inner ends of said projections for increasing the capacitance therebetween, and means for adjusting said capacitance to adjust said resonant frequency.
  • a metallic pipe-shaped wave guide means for establishing electromagnetic waves therein, a radiative wall substantially perpendicular to the direction of propagation of said waves, said wall'being pro: vided with an aperture which is resonant at the frequency of said waves, a pair of opposed projections extending into said aperture from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof, a pair of opposed plates connected, respectively, to the inner ends of said projections, and means for adjusting the spacing between said plates to adjust said resonant frequency.
  • a hollow-pipe wave guide a transverse partition therein, said partition having an aperture, and adjustable means for constricting the width of said aperture near its center, said means comprising a pair of oppositely disposed threaded studs projecting into said aperture and a pair of internally threaded sleeves screwed onto said studs.
  • a hollow-pipe wave guide a transverse partition therein, said partition having an aperture, and adjustable means for constricting the width of said aperture near its center comprising a pair of oppositely disposed threaded studs projecting into said aperture, a pair of internally threaded sleeves screwed onto said studs, and a pair of metal plates fastened to the opposed ends of said sleeves.
  • a hollow-pipe wave guide having an aperture
  • adjustable means for constricting the width of said aperture near its center said means comprising a pair of overlapping metallic flaps.
  • a conductively sheathed wave guide means for establishing electromagnetic waves therein, a transverse partition within said guide, said partition having an aperture which is series resonant at the frequency of said waves, two opposite projections and opposed plates at the inner ends thereof which constrict the width of said aperture, and means for adjusting the spacing between said plates.

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguide Aerials (AREA)

Description

March 27, 1956 A. G. FOX
WAVE-GUIDE IMPEDANCE ELEMENTS Original Filed July 30, 1942 1 FIG. 6
INVENTOR By A. 6. FOX
fia /Z i.
A TTORNEY haired States Patent WAVE-GUmE MEDAN CE ELEMENTS Arthur G. Fox, Eatontown, N. 3., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Original application July 30, 1942, Serial No. 452,851, now Patent No. 2,432,093, dated December 9, 1947. Divided and this application January 12, 1952, Serial No. 266,179
24 Claims. (Cl. 33373) This invention relates to guided electromagnetic wave transmission and more particularly to impedance elements for wave guides. This application is a division of application Serial No. 610,956, filed August 17, 1945, now Patent 2,607,850, issued August 19, 1952, which, in turn, is a division of application Serial No. 452,851, filed July 30, 1942, now Patent 2,432,093, issued December 9, 1947.
An object of the invention is to provide series-resonant impedance branches and parallel-resonant impedance branches for use in Wave guides.
Another object of the invention is to provide means for tuning such resonant impedance branches.
A uniform metallic sheath with or without a dielectric filler will serve as a guide for suitable electromagnetic waves. In cross section the sheath may be circular, rectangular, or of other shape. For all frequencies above a minimum, known as the cut-off frequency, the guide acts like a transmission line and has a specific propagation constant and characteristic impedance. For any particular frequency there are an infinite number of cross-sectional sizes and shapes of guide which will have the same characteristic impedance.
Shunt reactive elements are obtained by placing partial obstructions across the wave guide. For dominant transverse electric waves a shunt reactive element may be provided by a transverse metal partition having a slit therein which extends substantially from one side to the other. If the slit is perpendicular to the direction of polarization of the electric field the element is primarily capacitive, and if parallel with the field the element is primarily inductive. v
In accordance with the present invention an aperture in a transverse partition in a wave guide is proportioned to provide both inductive and capacitive components in the right amounts to resonate at a particular frequency. Depending upon the shape of the aperture the resonance thus produced may be either of the parallel type, offering a high shunt impedance across the guide, or of the series type, offering a low shunt impedance. For example, a rectangular aperture may be proportioned for parallel resonance or, if made sufficiently narrow, for series resonance. The resonance may be sharpened by providing inwardly extending projections on opposite sides of the opening. A wider opening may be used if the opposed edges of the aperture are made thicker, or if the two halves of the partition are made to overlap. The resonant frequency may be controlled by adjusting an effective dimension of the aperture or by controlling its eiiective configuration.
The nature of the invention will be more fully understood from the following detailed description and by reference to the accompanying drawings, in which like ref erence characters refer to like parts and in which:
Figs. 1 and 2 are perspective views of wave guides having therein partitions with apertures which provide reactive elements;
Fig. 3 shows a wave-guide termination employing a parallel-resonant element;
ICC
Fig. 4 shows an impedance element in accordance with the invention that may be adjusted for either parallel or series resonance; and
Figs. 5 and 6 show series-resonant elements in accordance with the invention.
Taking up the figures in more detail, Fig. 1 is a perspective view of a section of a metallic wave guide 1 in the form of a rectangular sheath which has, been crosssectioned just ahead of the transverse metallic partition comprising an upper portion 2 and a lower portion 3 with an aperture 4 therebetween extending from one side of the guide to the other. If the guide 1 is carrying dominant transverse electric waves with the electric field E polarized in a direction perpendicular to the length of the aperture 4, as indicated by the arrow, the partition will provide a shunt capacitive reactance. The magnitude of this reactance depends upon the width of the aperture 4 in the direction of the electric field E and decreases as the Width is decreased.
Fig. 2 is similar to Fig. 1 except that the aperture 4 extends from the top to the bottom of the guide 1 and has its length parallel to the direction of the electric field E. A partition of this type provides a shunt inductive reactance, the magnitude of which also decreases as the width of the aperture 4 decreases. A By properly proportioning the aperture, a partition in a wave guide may be made to provide both inductive and capacitive components in the right amounts to resonate at a particular frequency. This may be either a parallel resonance or a series resonance. For example, Fig. 3 shows a parallel-resonant element, that is, one providing a high shunt impedance, in a rectangular wave guide 1. The partition 11 has a symmetrically placed aperture 12 having a height V in a direction parallel to the. electric field E and a width W perpendicular thereto. There are an infinite number of different apertures which will produce parallel resonance but, once either the height V or the width W has been chosen, the other dimension is thereby determined. The line 13 gives the locus of the upper right-hand corner 14 of all possible rectangular apertures that will provide parallel resonance in the. wave guide 1. Such an element placed in the guide. and followed by a solid metallic partition such as 15 placed one-quarter of a wavelength behind the element 11 will serve as a reflectionless termination for the guide 1.
Fig. 4 shows a circular guide 7 having therein an impedance element which may be adjusted for either parallel resonance or series resonance. The partition 16 has a rectangular aperture into which project a pair of threaded studs 17 having their axes along a diameter of the guide 7 and parallel to the electric field E. The two internally threaded sleeves 18, each with a circular metal plate 19 fastened to one end, may be screwed onto the studs 17. The separation between the plates 19, and therefore the resonant frequency of the element, may thus be adjusted as desired. For series resonance, only a small separation is required. For parallel resonance the spacing will be greater, and in this case the plates 19 may not be required. An advantage of using an aperture with one or more inwardly extending projections, as shown in Fig. 4,
is that sharper resonances may be obtained.
Fig. 5 shows an element more particularly adapted for series resonance, providing a low shunt impedance. The partition 16 has a symmetrical aperture 20 having its length perpendicular ot the electric field E and its width constricted toward the center by means of the inwardly extending projections 21 and 22, to which are attached, on opposite sides of the partition 16, two overlapping metal flaps 23 and 24. These flaps 23 and 24 may be bent toward or away from each other to adjust the spacing.
therebetween and thereby the resonant frequency of the element.
Fig. 6 shows a modification'of the series-resonant element of Fig. in which the flaps 23 and 24 are replaced by two opposing metallic plates 25 and 26 which are perpendicular to the partition 16 and attached to the ends of the projections 21 and 22. 7
Since a metallic obstruction in a wave guide usually produces a point of lowpotential and high current, it is preferable that the partitions be secured to the walls of the guide by soldering, welding, or in some other appropriate manner such that a good electrical contact is obtained. It should also be noted that thinner partitions than those shown in the drawings will, under some circumstances, produce more satisfactory results. The partitions have been shown thicker in the drawings only in the interest of clarity. In Figs. 3, 4, 5 and 6 a portion of the wave guide has been cut away to show the partitions more clearly.
It is to be understood that the above-described arrangements are illustrative of the application of the principles of the invention. Numerous other arrangements may be devised by those skilled in the art without departing from the spirit and scope of the invention.
What is claimed is:
1. In combination, a conductively sheathed wave guide, means for establishing electromagnetic waves therein, a transverse partition within said guide, said partition having an aperture which is resonant at the frequency of said waves, two opposite projections and opposed plates at the inner ends thereof which constrict the width of said aperture and form a comparatively narrow central opening and a wider opening at each end thereof, and means for adjusting the spacing between said plates.
2. The combination in accordance with claim 1 in which said projections extend in a direction parallel to the electric field of said waves.
3. The combination in accordance with claim 1 in which said aperture is series resonant at said frequency.
4. In combination, a hollow-pipe wave guide, a conductive transverse partition therein, said partition containing an aperture which is dimensioned for resonance at a frequency freely transmissible by said guide, a pair of opposed projections extending from opposite sides of said aperture to form a comparatively narrow central opening and a wider opening at each end thereof, means for increasing the capacitance between the inner ends of said projections, and means for adjusting an effective dimension of said aperture to control the frequency at which said aperture is resonant.
5. The combination in accordance with claim 4 in which said aperture is series resonant at said frequency.
6. In combination, a conductively sheathed guide for for the transmission of electromagnetic waves, a partition transversely disposed at a point in said guide, said partition containing an aperture dimensioned to provide at said i point a shunt impedance which is resonant at a frequency transmissible by said guide, a pair of opposed projections extending from opposite sides of said aperture in a direction parallel to the electric field of said Waves to form a comparatively narrow central opening and a wider opening at each end thereof, means for increasing the capacitance between the inner ends of said projections, and means for adjusting the effective configuration of said aperture to adjust said resonant frequency.
7. The combination in accordance with claim 6 in which said aperture is series resonant at said frequency.
8. In combination, a conductively sheathed guide for the transmission of electromagnetic Waves and a partition transversely disposed in said guide, said partition having an aperture which is resonant at a frequency transmissible by said guide, and said aperture comprising a comparatively narrow, adjustable central opening and a wider opening at each end thereof.
9. The combination in accordance with claim 8 in which said aperture is series resonant at said frequency.
10. In combination, a metallic pipe-shaped wave guide, means for establishing electromagnetic waves therein, a partition substantially perpendicular to the direction of propagation of said waves, said partition being provided with an aperture which is resonant at the frequency of said waves, a pair of opposite projections and opposed plates at the inner ends thereof which constrict the width of said aperture in a direction parallel to the electric field of said waves and form a comparatively narrow central opening and a wider opening at each end thereof, and means for adjusting the spacing between said plates.
. 11. The combination in accordance with claim 10 in which said aperture is series resonant at said frequency.
12. In combination, a hollow-pipe wave guide, means for establishing electromagnetic waves therein, a metallic wall member associated with said guide, said member being positioned transversely to the direction of wave I propagation through said guide and having an opening which is resonant at the frequency of said waves, a pair of opposed projections extending into said opening from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof,
means at the inner ends of said projections for increasing the capacitance therebetween, and means for adjusting said capacitance to adjust said resonant frequency.
13. The combination in accordance with claim 12 in which said opening is series resonant at said frequency.
14. In combination, a pipe-like wave guide, means for establishing electromagnetic waves therein, a wall member substantially perpendicular to the longitudinal axis of said guide, said member having an aperture dimensioned to be resonant at the frequency of said waves, a pair of opposed projections extending into said aperture from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof, a pair of opposed plates connected, respectively, to the inner ends of said projections, and means for controlling an effective dimension of said aperture to control said resonant frequency.
15. The combination in accordance with claim 14 in which said aperture is series resonant at said frequency.
16. In combination, a wave guide of the hollow-pipe type, exciting means for establishing electromagnetic waves therein, a metallic Wall positioned in said guide, said wall lying in a plane substantially transverse to the direction of propagation of said waves and being provided with an aperture which is resonant at the frequency of said exciting means, a pair of opposed projections extending into said aperture from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof, means at the inner ends of said projections for increasing the capacitance therebetween, and means for adjusting said capacitance to adjust said resonant frequency.
17. The combination in accordance with claim 16 in which said aperture is series resonant at said frequency.
18. In combination, a metallic pipe-shaped wave guide, means for establishing electromagnetic waves therein, a radiative wall substantially perpendicular to the direction of propagation of said waves, said wall'being pro: vided with an aperture which is resonant at the frequency of said waves, a pair of opposed projections extending into said aperture from opposite sides thereof in a direction parallel to the electric field of said waves to form a comparatively narrow central opening and a wider opening at each end thereof, a pair of opposed plates connected, respectively, to the inner ends of said projections, and means for adjusting the spacing between said plates to adjust said resonant frequency.
19. The combination in accordance with claim 18 in which said aperture is series resonant at said frequency. H
20. In combination, a hollow-pipe wave guide, a transverse partition therein, said partition having an aperture, and adjustable means for constricting the width of said aperture near its center, said means comprising a pair of oppositely disposed threaded studs projecting into said aperture and a pair of internally threaded sleeves screwed onto said studs.
21. In combination, a hollow-pipe wave guide, a transverse partition therein, said partition having an aperture, and adjustable means for constricting the width of said aperture near its center comprising a pair of oppositely disposed threaded studs projecting into said aperture, a pair of internally threaded sleeves screwed onto said studs, and a pair of metal plates fastened to the opposed ends of said sleeves.
22. In combination, a hollow-pipe wave guide, a transverse partition therein, said partition having an aperture, and adjustable means for constricting the width of said aperture near its center, said means comprising a pair of overlapping metallic flaps.
23. The combination in accordance with claim 22 in which the spacing between said flaps and the area of overlap are selected to make said aperture series resonant at a frequency freely transmissible by said guide.
24. In combination, a conductively sheathed wave guide, means for establishing electromagnetic waves therein, a transverse partition within said guide, said partition having an aperture which is series resonant at the frequency of said waves, two opposite projections and opposed plates at the inner ends thereof which constrict the width of said aperture, and means for adjusting the spacing between said plates.
References (Iited in the file of this patent UNITED STATES PATENTS 2,106,771 Southworth Feb. 1, 1938 2,210,636 Schelkunotf Aug. 6, 1940 2,270,416 Cork Jan. 20, 1942 2,368,031 Llewellyn Jan. 23, 1945 2,408,435 Mason Oct. 1, 1946
US266179A 1942-07-30 1952-01-12 Wave-guide impedance elements Expired - Lifetime US2740094A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
BE468045D BE468045A (en) 1942-07-30
NL73887D NL73887C (en) 1942-07-30
GB22914/45A GB578617A (en) 1942-07-30 1943-11-05 Improvements in or relating to systems for transmitting guided electromagnetic waves
GB18433/43A GB578597A (en) 1942-07-30 1943-11-05 Improvements in or relating to systems for transmitting guided electromagnetic waves
US610957A US2434645A (en) 1942-07-30 1945-08-17 Wave guide bend
US610956A US2607850A (en) 1942-07-30 1945-08-17 Wave guide impedance element
US612681A US2422191A (en) 1942-07-30 1945-08-25 Impedance transformer for wave guides
US612680A US2503549A (en) 1942-07-30 1945-08-25 Impedance matching in wave guides
US614935A US2432094A (en) 1942-07-30 1945-09-07 Impedance transformer for wave guides
US614937A US2434646A (en) 1942-07-30 1945-09-07 Wave guide branching arrangement
US614936A US2530691A (en) 1942-07-30 1945-09-07 Wave filter
CH265036D CH265036A (en) 1942-07-30 1946-09-12 Filter for guided electromagnetic waves.
FR938693D FR938693A (en) 1942-07-30 1946-10-24 System for the transmission of guided electromagnetic waves
US789811A US2588226A (en) 1942-07-30 1947-12-05 Wave filter
DEP28888A DE818384C (en) 1942-07-30 1948-12-31 Filter for the transmission of a band in waveguides of guided electrical micro waves
US266179A US2740094A (en) 1942-07-30 1952-01-12 Wave-guide impedance elements

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US452851A US2432093A (en) 1942-07-30 1942-07-30 Wave transmission network
US610956A US2607850A (en) 1942-07-30 1945-08-17 Wave guide impedance element
US612680A US2503549A (en) 1942-07-30 1945-08-25 Impedance matching in wave guides
US614937A US2434646A (en) 1942-07-30 1945-09-07 Wave guide branching arrangement
US614936A US2530691A (en) 1942-07-30 1945-09-07 Wave filter
US789811A US2588226A (en) 1942-07-30 1947-12-05 Wave filter
US266179A US2740094A (en) 1942-07-30 1952-01-12 Wave-guide impedance elements

Publications (1)

Publication Number Publication Date
US2740094A true US2740094A (en) 1956-03-27

Family

ID=27569520

Family Applications (6)

Application Number Title Priority Date Filing Date
US610956A Expired - Lifetime US2607850A (en) 1942-07-30 1945-08-17 Wave guide impedance element
US612680A Expired - Lifetime US2503549A (en) 1942-07-30 1945-08-25 Impedance matching in wave guides
US614936A Expired - Lifetime US2530691A (en) 1942-07-30 1945-09-07 Wave filter
US614937A Expired - Lifetime US2434646A (en) 1942-07-30 1945-09-07 Wave guide branching arrangement
US789811A Expired - Lifetime US2588226A (en) 1942-07-30 1947-12-05 Wave filter
US266179A Expired - Lifetime US2740094A (en) 1942-07-30 1952-01-12 Wave-guide impedance elements

Family Applications Before (5)

Application Number Title Priority Date Filing Date
US610956A Expired - Lifetime US2607850A (en) 1942-07-30 1945-08-17 Wave guide impedance element
US612680A Expired - Lifetime US2503549A (en) 1942-07-30 1945-08-25 Impedance matching in wave guides
US614936A Expired - Lifetime US2530691A (en) 1942-07-30 1945-09-07 Wave filter
US614937A Expired - Lifetime US2434646A (en) 1942-07-30 1945-09-07 Wave guide branching arrangement
US789811A Expired - Lifetime US2588226A (en) 1942-07-30 1947-12-05 Wave filter

Country Status (6)

Country Link
US (6) US2607850A (en)
BE (1) BE468045A (en)
CH (1) CH265036A (en)
DE (1) DE818384C (en)
FR (1) FR938693A (en)
GB (1) GB578597A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479622A (en) * 1966-04-11 1969-11-18 Gen Instrument Corp Multi-compartment tuner constructtion facilitating electromagnetic high-frequency coupling and minimizing electrostatic low-frequency coupling
US3577104A (en) * 1968-12-26 1971-05-04 Microwave Dev Lab Inc Waveguide filter having sequence of thick capacitive irises
US4028651A (en) * 1976-05-06 1977-06-07 Hughes Aircraft Company Coupled-cavity microwave filter

Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE464876A (en) * 1945-06-02
US2666903A (en) * 1945-09-20 1954-01-19 Clarence W Jones Cavity coupling to wave guide
US2531447A (en) * 1947-12-05 1950-11-28 Bell Telephone Labor Inc Hybrid channel-branching microwave filter
GB655146A (en) * 1948-10-01 1951-07-11 Emi Ltd Improvements relating to electrical-wave band pass circuits
US2744242A (en) * 1950-01-04 1956-05-01 Sperry Rand Corp Wave guide delay line
DE975422C (en) * 1950-01-06 1961-11-23 Siemens Ag Electrical filter arrangement consisting of coaxial resonance circuits
US2639371A (en) * 1950-01-25 1953-05-19 Bell Telephone Labor Inc Wave-guide isolation coupling system
BE500946A (en) * 1950-02-03
US2739287A (en) * 1950-03-17 1956-03-20 Henry J Riblet Waveguide hybrid junctions
US2686902A (en) * 1950-07-24 1954-08-17 Bell Telephone Labor Inc Microwave branching arrangement
GB696394A (en) * 1951-05-18 1953-08-26 Gen Electric Co Ltd Improvements in or relating to electric filter circuits
US2816270A (en) * 1951-06-26 1957-12-10 Bell Telephone Labor Inc Microwave channel dropping filter pairs
US2762986A (en) * 1951-08-24 1956-09-11 Raytheon Mfg Co Low pass filters
US2758282A (en) * 1952-03-28 1956-08-07 Gen Precision Lab Inc Transforming microwave energy from rectangular air filled wave guide
US2832054A (en) * 1952-05-16 1958-04-22 Bell Telephone Labor Inc Gyrating wave transmission networks
US3010082A (en) * 1952-07-25 1961-11-21 Bell Telephone Labor Inc Hybrid ring network
US2785381A (en) * 1953-04-23 1957-03-12 Burton P Brown Electromagnetic wave filter
US2814777A (en) * 1953-11-23 1957-11-26 Jr Philip H Peters Noise generating system
US2783348A (en) * 1954-03-26 1957-02-26 Nat Cylinder Gas Co High-frequency heating applicators
DE969969C (en) * 1955-01-14 1958-08-14 Siemens Ag Coupling device for microwaves
FR1123310A (en) * 1955-01-21 1956-09-20 Thomson Houston Comp Francaise Selective switching device for electromagnetic waveguide
US2951221A (en) * 1955-08-01 1960-08-30 Hughes Aircraft Co Phase shifter
US2956247A (en) * 1956-01-26 1960-10-11 Sperry Rand Corp Broad band microwave phase shifter
US3058072A (en) * 1956-11-15 1962-10-09 Raytheon Co Microwave filters
DE1222177B (en) * 1956-12-07 1966-08-04 Siemens Ag Switch arrangement for very short electromagnetic waves
DE1220948B (en) * 1958-07-30 1966-07-14 Siemens Ag Filter arrangement for very short electromagnetic waves
US3093733A (en) * 1960-07-08 1963-06-11 John P Blewett Resonator particle separator
GB970933A (en) * 1960-10-11 1964-09-23 Nat Res Dev Improvements in waveguide junctions
BE631498A (en) * 1962-04-25
US3200352A (en) * 1962-05-11 1965-08-10 Motorola Inc Waveguide directional filter employing quarter-wave spaced parallel tuned cavities
US3210693A (en) * 1962-12-20 1965-10-05 Automatic Elect Lab Waveguide branching filter having compensating cavities
US3360750A (en) * 1965-07-23 1967-12-26 Varian Associates High frequency waveguide load comprising a dielectric window in contact with lossy coolant fluid
US3428918A (en) * 1966-05-26 1969-02-18 Us Army Multiplexer channel units
US3579153A (en) * 1967-09-07 1971-05-18 Bell Telephone Labor Inc Microwave filter
US3593155A (en) * 1968-12-27 1971-07-13 Bendix Corp Resonant ring varactor circuit
US3600711A (en) * 1969-08-13 1971-08-17 Varian Associates Coaxial filter having harmonic reflective and absorptive means
US3611214A (en) * 1969-08-18 1971-10-05 Varian Associates Waveguide reflective harmonic filter
US3731235A (en) * 1971-11-03 1973-05-01 Gte Sylvania Inc Dual polarized diplexer
US4124830A (en) * 1977-09-27 1978-11-07 Bell Telephone Laboratories, Incorporated Waveguide filter employing dielectric resonators
DE3208029A1 (en) * 1982-03-05 1983-09-15 Siemens AG, 1000 Berlin und 8000 München Frequency separating filter for separating two frequency bands with a different frequency position
US4602229A (en) * 1983-12-30 1986-07-22 Motorola, Inc. Resonant bandpass T filter and power splitter
US4725796A (en) * 1985-03-13 1988-02-16 The Boeing Company Millimeter and infra-red wavelength separating device
CA1259676A (en) * 1986-12-04 1989-09-19 Chuck K. Mok 14/12 ghz duplexer
DE3729402A1 (en) * 1987-09-03 1989-03-16 Licentia Gmbh Waveguide filter arrangement
US5805033A (en) * 1996-02-26 1998-09-08 Allen Telecom Inc. Dielectric resonator loaded cavity filter coupling mechanisms
RU2739969C1 (en) * 2020-07-14 2020-12-30 федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") Rejection waveguide microwave filter
RU2745591C1 (en) * 2020-08-17 2021-03-29 федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") Device for measuring the inherent quality of a dielectric resonator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106771A (en) * 1935-09-11 1938-02-01 American Telephone & Telegraph Ultrahigh frequency signaling
US2210636A (en) * 1937-09-18 1940-08-06 Bell Telephone Labor Inc Guided wave transmission
US2270416A (en) * 1936-12-23 1942-01-20 Emi Ltd Electrical wave system
US2368031A (en) * 1940-03-15 1945-01-23 Bell Telephone Labor Inc Electron discharge device
US2408435A (en) * 1941-03-01 1946-10-01 Bell Telephone Labor Inc Pipe antenna and prism

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2030178A (en) * 1933-01-19 1936-02-11 American Telephone & Telegraph Electrical circuit arrangement
US2129711A (en) * 1933-03-16 1938-09-13 American Telephone & Telegraph Guided transmission of ultra high frequency waves
US2129712A (en) * 1933-12-09 1938-09-13 American Telephone & Telegraph Transmission of energy effects by guided electric waves in a dielectric medium
US2206923A (en) * 1934-09-12 1940-07-09 American Telephone & Telegraph Short wave radio system
US2106768A (en) * 1934-09-25 1938-02-01 American Telephone & Telegraph Filter system for high frequency electric waves
US2106769A (en) * 1935-08-23 1938-02-01 American Telephone & Telegraph Transmission of guided waves
DE970327C (en) * 1936-03-07 1958-09-11 Pintsch Bamag Ag Device for bundling ultra-short electromagnetic waves
US2200023A (en) * 1936-09-10 1940-05-07 Julius Pintsch Kommandit Ges Ultra-high-frequency oscillation apparatus
FR826605A (en) * 1936-09-15 1938-04-06 Pintsch Julius Kg Power conduction for devices used to generate, amplify or receive ultra-short waves
US2197123A (en) * 1937-06-18 1940-04-16 Bell Telephone Labor Inc Guided wave transmission
US2238770A (en) * 1938-03-07 1941-04-15 Emi Ltd High frequency electrical conductor or radiator
US2253503A (en) * 1938-08-06 1941-08-26 Bell Telephone Labor Inc Generation and transmission of high frequency oscillations
US2253589A (en) * 1938-08-06 1941-08-26 George C Southworth Generation and transmission of high frequency oscillations
US2323201A (en) * 1939-01-07 1943-06-29 Rca Corp Tuned circuit and associated devices therefor
US2284529A (en) * 1939-08-04 1942-05-26 Bell Telephone Labor Inc Wave transmission network
US2375223A (en) * 1939-08-24 1945-05-08 Univ Leland Stanford Junior Dielectric guide signaling
FR874433A (en) * 1940-05-11 1942-08-06 Pintsch Julius Kg Electronic tube device for ultra-short electric waves, in particular for waves of the order of decimeter and centimeter
US2288030A (en) * 1941-01-10 1942-06-30 Farnsworth Television & Radio Transmission line structure
US2321521A (en) * 1941-01-10 1943-06-08 Farnsworth Television & Radio Frequency band filter
US2402184A (en) * 1941-05-03 1946-06-18 Bell Telephone Labor Inc Ultra high frequency electronic device contained within wave guides
US2406402A (en) * 1941-09-03 1946-08-27 Bell Telephone Labor Inc Frequency adjustment of resonant cavities
US2403025A (en) * 1941-09-24 1946-07-02 Bell Telephone Labor Inc Electron beam device
US2438913A (en) * 1941-10-31 1948-04-06 Sperry Corp High-frequency filter structure
US2460401A (en) * 1941-11-28 1949-02-01 Bell Telephone Labor Inc Directive microwave radio antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106771A (en) * 1935-09-11 1938-02-01 American Telephone & Telegraph Ultrahigh frequency signaling
US2270416A (en) * 1936-12-23 1942-01-20 Emi Ltd Electrical wave system
US2210636A (en) * 1937-09-18 1940-08-06 Bell Telephone Labor Inc Guided wave transmission
US2368031A (en) * 1940-03-15 1945-01-23 Bell Telephone Labor Inc Electron discharge device
US2408435A (en) * 1941-03-01 1946-10-01 Bell Telephone Labor Inc Pipe antenna and prism

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479622A (en) * 1966-04-11 1969-11-18 Gen Instrument Corp Multi-compartment tuner constructtion facilitating electromagnetic high-frequency coupling and minimizing electrostatic low-frequency coupling
US3577104A (en) * 1968-12-26 1971-05-04 Microwave Dev Lab Inc Waveguide filter having sequence of thick capacitive irises
US4028651A (en) * 1976-05-06 1977-06-07 Hughes Aircraft Company Coupled-cavity microwave filter

Also Published As

Publication number Publication date
GB578597A (en) 1946-07-04
DE818384C (en) 1951-10-25
US2530691A (en) 1950-11-21
US2588226A (en) 1952-03-04
US2434646A (en) 1948-01-20
US2607850A (en) 1952-08-19
BE468045A (en)
CH265036A (en) 1949-11-15
FR938693A (en) 1948-10-21
US2503549A (en) 1950-04-11

Similar Documents

Publication Publication Date Title
US2740094A (en) Wave-guide impedance elements
US2432093A (en) Wave transmission network
US2155508A (en) Wave guide impedance element and network
US2749523A (en) Band pass filters
US3462713A (en) Waveguide-stripline transducer
US4138652A (en) Dielectric resonator capable of suppressing spurious mode
US2964718A (en) Microwave circuits
US2627571A (en) Choke joint high-frequency heater
US3159803A (en) Dual coaxial cavity resonators with variable coupling therebetween
US2729794A (en) High frequency apparatus
US3936778A (en) Microstrip device having mode suppressing means
US2476034A (en) Conformal grating resonant cavity
US2549511A (en) Apparatus for uniform heating with electromagnetic fields
US4167715A (en) Wideband polarization coupler
US2432094A (en) Impedance transformer for wave guides
US10615474B2 (en) Apparatuses and methods for mode suppression in rectangular waveguide
US2630492A (en) High-frequency phase shifting apparatus
US2560353A (en) Cavity resonator
US3175218A (en) Variable electronic slot coupler
US2931992A (en) Microwave impedance branch
US2510288A (en) Microwave band reflection filter
US3184695A (en) Circular electric mode filter
US4104558A (en) Tunable radio frequency pulse generators
US2800632A (en) Wave guide mode transformer
US3548348A (en) Dielectric resonator mode suppressor