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US2553313A - Band stop filter for electromagnetic waves - Google Patents

Band stop filter for electromagnetic waves Download PDF

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Publication number
US2553313A
US2553313A US638371A US63837145A US2553313A US 2553313 A US2553313 A US 2553313A US 638371 A US638371 A US 638371A US 63837145 A US63837145 A US 63837145A US 2553313 A US2553313 A US 2553313A
Authority
US
United States
Prior art keywords
frame
guide
axis
electromagnetic waves
stop filter
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
US638371A
Other languages
English (en)
Inventor
Gutton Henri
Ortusi Jean
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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 CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Application granted granted Critical
Publication of US2553313A publication Critical patent/US2553313A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators
    • 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
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • This invention relates to band stop filters for electromagnetic waves propagated in the interior of a dielectric conductor and has for its object the provision of an apparatus which, arranged in a conductor of any shape traversed by a suitable wave, permits the transmission of electromagnetic waves over a definite width of band embracing a fixed frequency to be stopped, whilst fully ensuring the transmission of the other frequencies.
  • the width of band passing through the filter determines the selectivity of the filter.
  • the invention consists essentially in arranging in the interior of the conductor a conductor frame the section and the angular setting or orientation of which may be modified as desired from the exterior, means for adjusting the section and the orientation being, furthermore, provided.
  • FIG. 1 illustrates in elevation and in section an apparatus constructed in accordance with the present invention
  • Figure 2 is a plan view of Figure 1;
  • Figures 3a and 3b are are transmission curves of a conductor provided with an apparatus constructed in accordance with the invention; the curve in Figure 3a is drawn corresponding to the angle of orientation of the frame and the curve in Figure 3b is drawn corresponding to the length of the frame.
  • a conductor frame of rectangular profile ABCD is arranged in the interior of the conductor G ( Figures 1 and 2).
  • the longitudinal axis of the frame is coaxial with longitudinal symmetrical axis ZOZ' of the upright section of the conductor.
  • the frame is carried by rods E and F arranged coaxially with the said axis ZOZ'.
  • the upper rod E is provided with a disc N, of a thickness corresponding to that of the wall, and confined, with a certain lateral play, between two other bored discs M and M between which it can rotate and slide slightly.
  • the lower rod F is provided with a terminal swivel joint U fitted in a spherical recess carried by the extremity of a threaded rod L constituting an extension of the rod F, and screwing into and through the wall of the conductor G where it terminates outside in a knob B1.
  • the length of the frame may be made variable by telescoping the lower part of the frame (whichmay be made of a hollow tube) over the upper fixed part. This sliding action is effected without any change in the orientation of the plane of the frame by means of the threaded screw actuated through the medium of the knob B1.
  • a spring K arranged in the interior of the sliding tube, connects the lower and upper parts of the frame, and permits of a displacement corresponding to the threaded length of the screw L.
  • the whole of the frame as far as the spherical head U is rotatable about the axis thereof by means of the two toothed wheels 01 and C2.
  • the wheel C2 is rotatable about an axis 0' through the medium of a rod L connected to a knob B2 and is operable to rotate the wheel C1 which is connected to the rod E.
  • the angle of rotation of the knob 31 which can be read on a scale, denotes the length Z of the frame.
  • the indications read on the scales of the said length and angle, together with the curves of variation of the coefiicient of transmission corresponding with the angle of the frame or its length, are employed to determine according to the values chosen, the corresponding coefficient and the band width or, conversely, to determine the angle and the length according to the coefiicient of transmission and the width of band desired.
  • a frame having the same cross-sectional shape as the guide taken in a plane perpendicular' to the walls thereof, said frame being tuned to admit the frequency of a given wave among those carried by the guide, and means for varying the angular setting of said frame about an axis contained in the plane thereof and perpendicular tothe wall of the guide.
  • a rectangular frame tuned to admit the frequency of a given wave among those carried by the guide, and means for varying, the angular setting of said frame about an axis contained in the plane thereof, parallel to two of the sides thereof andperpendicular tothe walls of the guide.
  • a rectangular frame comprising two substantially U-shaped members, one of said members having hollow arms adapted to accommodate telescopically the arms of the other of said members, one of said members being held against translational movement but rotatable about its own axis and having a stem rigid therewith and prolonging said axis through a wall of the guide, an adjustment knob outside the guide opposite said first-mentioned stem, a rotary joint connecting said threaded stem to said other member, internally threaded means connected to the wall. of the guide and threadedly engaging saidthreaded stem,an adjustment knob on the outer. extremity of said threaded stem rotation of which will effect said translational movement and a ust the telescopic relationship of said members, and return springs in said hollow arms yieldablyurging. said members apart in all adjustedxpositions to prevent back-lash.
  • a band stopfilteras claimed in claim 7, arranged for a rectangular guide excited in Hot waves comprising a. rectangular frame, one of the symmetrical axes of which is arranged ma normal" section of the guide and according to the axis of this section normal to the electric vector, means mounting the said frame for rotation about the said axis, the two sides of said framewhich are parallel to the said axis being extensible';

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  • Waveguides (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Aerials With Secondary Devices (AREA)
US638371A 1943-12-14 1945-12-29 Band stop filter for electromagnetic waves Expired - Lifetime US2553313A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR870588X 1943-12-14

Publications (1)

Publication Number Publication Date
US2553313A true US2553313A (en) 1951-05-15

Family

ID=9350483

Family Applications (1)

Application Number Title Priority Date Filing Date
US638371A Expired - Lifetime US2553313A (en) 1943-12-14 1945-12-29 Band stop filter for electromagnetic waves

Country Status (6)

Country Link
US (1) US2553313A (de)
BE (1) BE459108A (de)
CH (1) CH250785A (de)
DE (1) DE870588C (de)
FR (1) FR986934A (de)
GB (1) GB594368A (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197123A (en) * 1937-06-18 1940-04-16 Bell Telephone Labor Inc Guided wave transmission
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197123A (en) * 1937-06-18 1940-04-16 Bell Telephone Labor Inc Guided wave transmission
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network

Also Published As

Publication number Publication date
BE459108A (de)
FR986934A (fr) 1951-08-07
GB594368A (en) 1947-11-10
CH250785A (fr) 1947-09-15
DE870588C (de) 1953-03-16

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