US2546742A - High-frequency electrical filter for use in wave guides - Google Patents

High-frequency electrical filter for use in wave guides Download PDF

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Publication number
US2546742A
US2546742A US740844A US74084447A US2546742A US 2546742 A US2546742 A US 2546742A US 740844 A US740844 A US 740844A US 74084447 A US74084447 A US 74084447A US 2546742 A US2546742 A US 2546742A
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United States
Prior art keywords
guide
resonators
wave
frequency electrical
wave guides
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Expired - Lifetime
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US740844A
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English (en)
Inventor
Gutton Henri
Ortusi Antoine Jean
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Thales SA
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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
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure

Definitions

  • This invention relates to high frequency electrical filters for use in wave guides and more particularly though not exclusively to band pass filters for use on decimetre waves in a wave guide employed, for example, for connecting a transmitter with a radiating horn.
  • An arrangement in accordance with this invention comprises at least two resonators coupled in the guide by one or more spaces.
  • the trans mission curve'of an assembly thus constituted presents aflattoppedcurve characteristic of a band pass filter.
  • An arrangement in accordance with this invention can, however, comprise more than two resonators inter-coupled by intervening adjustable spaces and be arranged to give a transmis sion curveofalmost any form desired.
  • Figure 1 is a diagrammatic showing of the wave guide having two spaced cavity resonators
  • Figure 1a is a view of the same wave guide partly in perspective and partly in section;
  • Figure 2 shows a transmission curve of each resonator taken alone
  • Figure 3a to Figure 3d are diagrams of transmission curves based on varying relations of length of the resonator chambers and of the space therebetween;
  • Figure 4 is a view partly in diagram and partly in section of an adjustable metallic insert
  • Figure 5 shows a typical curve connecting the length values of the resonator and the intervening space
  • Figure 6 is a transverse sectional view of a sliding arrangement for the resonator chamber.
  • Figure 7 is a longitudinal sectional view of the arrangement shown in Figure 6.
  • R1 and R2 are two identical resonators formed with apertures F1, F'1 and FaF'z, and arranged in a wave guide C with an adjustable space E between them.
  • Each resonator considered alone, has a transmission curve of the form represented in Fig. 2, where co-eificients of transmission T are plotted as ordinates against frequency f. flhe width of the band passed by such a resonator may be retransmission is of the form illustrated by Fig 3a; if I is equal to the curve of transmission is of the form illus trated in Fig. 32;; if Z is substantially equal to the curve of transmission isas represented by Fig. 30; while for values of Z notably greater than 20 the curve of transmission reverts to a form as shown in Fig. 3d.
  • a band pass filter in accordance with this invention may be made and adjusted without touching the resonators R1 and R2 once positioned, for the length I may be, in effect, varied (without actually moving R1 or R2) by providing one or more adjustable metallic inserts such as rods or screws V (Fig. 4) positioned with respect to the apertures F'1 or F2 of the resonators R1 and R2 at a distance equal to one quarter of the wave length A in the guide.
  • Fig. 5 is a typical curve connecting values of ZZ0 expressed in centimetres as a function of the extent of entry e (also expressed in centimetres) for a rectangular sectioned guide 5 cm. x 16 cm. operating on a wave length (A) of 20 cm.
  • resonators where movableresonators are required they may be constituted by suitably sectioned boxes (corresponding with the wave guide section) of dimension a little less than the interior dimensions of the guide so that they can slide easily therein, electrical contact with the guide being ensured by suitable metallic contacts and handles sliding in longitudinal slots formed in the guide wall being provided.
  • the metallic contacts should be located along nodal lines of the electric current circulating in the plane of the section of the guide.
  • the regulating rod or other insert of each resonator is situated in a transverse plane different from that of the handles thereof and also slides freely in a wall slot formed in the guide.
  • Fig. 6 shows in transverse sectional view and Fig. '7 in longitudinal sectional view a sliding arrangement of the nature described in the last paragraph for the case of a rectangular guide dealing with an H01 wave.
  • E represents a box which slides in the guide G between friction contacts Q, P, P represent the handles fixed to E and which slide in longitudinal slots L in the Walls of the guide G and V represents the tuning insert of the resonator.
  • a filter device comprising, in the interior of a wave guide provided with longitudinal slots constructed in its wall, two cavity resonator elements positioned in series in said guide and tuned to the same frequency, one of said resonator elements comprising a box slidable in the interior of the guide and provided with contacts for establishing electrical contact with the guide and with handles extending out from the guide through said slots.
  • a filter device comprising, in the interior of a guide provided with longitudinal slots constructed in its walls, two cavity resonator ele' ments positioned in series in said guide and tuned to the same frequency, one of said resonator elements comprising a box slidable in the interior of the guide and provided with contacts for establishing electrical contact with the guideand with handles extending out from the guide through said slots, a conductive rod positioned in the interior of said guide in the space between said resonators, and means connected to the 4 guide for adjusting the depth of entry of said rod into the guide.
  • a filter device in which said cavity resonators are mutually positioned at a distance substantially equal to lo being the length of one of said cavity resonators and i being the length of the wave in the guide. 4. A filter device according to claim 2 in which said resonators are mutually positioned at a distance substantially equal to Zn being the length of one of said cavity resonators and A being the length of a wave in the guide.
  • a band-pass filter device comprising, in the interior of a wave guide, two cavity resonator elements positioned in series in said guide and tuned to the same frequency, one of said resonator elements being a slidable element so as to vary the physical distance separating the two' resonators from one another and to thereby adjust the width of the pass band of said filter.
  • a band-pass filter device as claimed in cl'aini' 5 including a conductive rod positioned in the: interior of said guide in the space between said resonators, and means connected to the guide for adjusting the depth of entry of said rod into the guide. 4 V

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US740844A 1945-06-02 1947-04-11 High-frequency electrical filter for use in wave guides Expired - Lifetime US2546742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR996742T 1945-06-02

Publications (1)

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US2546742A true US2546742A (en) 1951-03-27

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US740844A Expired - Lifetime US2546742A (en) 1945-06-02 1947-04-11 High-frequency electrical filter for use in wave guides

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US (1) US2546742A (de)
BE (1) BE464876A (de)
FR (1) FR996742A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668191A (en) * 1949-06-30 1954-02-02 Sperry Corp Wave energy polarization converter
US2697209A (en) * 1951-07-13 1954-12-14 Itt Tunable band pass filter
US2770784A (en) * 1952-06-25 1956-11-13 Robert H Hatch Metal painted aperture or window for waveguides
US3035236A (en) * 1958-08-15 1962-05-15 Henry J Riblet Microwave filters
US3137828A (en) * 1961-08-01 1964-06-16 Scope Inc Wave guide filter having resonant cavities made of joined parts
US3153208A (en) * 1960-05-06 1964-10-13 Henry J Riblet Waveguide filter having nonidentical sections resonant at same fundamental frequency and different harmonic frequencies
US3205460A (en) * 1961-09-18 1965-09-07 Elwin W Seeley Dielectric gap miniaturized microwave filter
US3544927A (en) * 1967-07-13 1970-12-01 Gen Electric Co Ltd Band-pass waveguide filters employing transmission type resonant irises
DE3617203A1 (de) * 1986-05-22 1987-11-26 Kathrein Werke Kg Hohlleiterfilter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407267A (en) * 1943-03-05 1946-09-10 Sperry Gyroscope Co Inc Ultra high frequency attenuator
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network
US2434646A (en) * 1942-07-30 1948-01-20 Bell Telephone Labor Inc Wave guide branching arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network
US2434646A (en) * 1942-07-30 1948-01-20 Bell Telephone Labor Inc Wave guide branching arrangement
US2407267A (en) * 1943-03-05 1946-09-10 Sperry Gyroscope Co Inc Ultra high frequency attenuator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668191A (en) * 1949-06-30 1954-02-02 Sperry Corp Wave energy polarization converter
US2697209A (en) * 1951-07-13 1954-12-14 Itt Tunable band pass filter
US2770784A (en) * 1952-06-25 1956-11-13 Robert H Hatch Metal painted aperture or window for waveguides
US3035236A (en) * 1958-08-15 1962-05-15 Henry J Riblet Microwave filters
US3153208A (en) * 1960-05-06 1964-10-13 Henry J Riblet Waveguide filter having nonidentical sections resonant at same fundamental frequency and different harmonic frequencies
US3137828A (en) * 1961-08-01 1964-06-16 Scope Inc Wave guide filter having resonant cavities made of joined parts
US3205460A (en) * 1961-09-18 1965-09-07 Elwin W Seeley Dielectric gap miniaturized microwave filter
US3544927A (en) * 1967-07-13 1970-12-01 Gen Electric Co Ltd Band-pass waveguide filters employing transmission type resonant irises
DE3617203A1 (de) * 1986-05-22 1987-11-26 Kathrein Werke Kg Hohlleiterfilter

Also Published As

Publication number Publication date
BE464876A (de)
FR996742A (fr) 1951-12-26

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