US3496497A - High-power harmonic suppression filters - Google Patents

High-power harmonic suppression filters Download PDF

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Publication number
US3496497A
US3496497A US412638A US3496497DA US3496497A US 3496497 A US3496497 A US 3496497A US 412638 A US412638 A US 412638A US 3496497D A US3496497D A US 3496497DA US 3496497 A US3496497 A US 3496497A
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United States
Prior art keywords
waveguide
coaxial
transmission line
harmonic
line
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
US412638A
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English (en)
Inventor
Stanley William Conning
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.)
Alcatel Lucent NV
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International Standard Electric Corp
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Filing date
Publication date
Priority claimed from AU38537/63A external-priority patent/AU279199B2/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
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Assigned to ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS reassignment ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE
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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
    • H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/162—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion absorbing spurious or unwanted modes of propagation

Definitions

  • Absorption type harmonic suppression filters have previously been described using rectangular waveguides for the main transmission, but their operation has been limited to cut-off frequencies above about 500 mc./s.
  • Such prior art devices are described in Price et al., Harmonic Suppression by Leaky-Wall Waveguide Filter, IRE WES- CON Convention Record 1959, part 1, page 112; and Met, Absorptive Filters for Microwave Harmonic Power, proceedings of the IRE, volume 47, 1959, page 762.
  • Coaxial reflection type filters have also been described but these must be so dimensioned that only the TEM mode can propagate up to at least the frequency of the 4th or 5th harmonic.
  • the present invention enables absorption type filters to be designed which have substantially lower operating frequencies than the previously described rectangular waveguide type, and which can have a 4- or 5-fold greater diameter than the coaxial reflection type filter and thus have a greatly increased power-handling capacity.
  • a high-power harmonic suppression filter comprises a coaxial transmission line along which high-frequency electromagnetic energy may be transmitted, a waveguide surrounding part of the length of the coaxial line and formed as a septate coaxial waveguide or lunar line having as one member thereof the outer member of the coaxial line, coupling means between the coaxial line and waveguide, and energy absorption means in the waveguide.
  • FIGURE 1 is a diagrammatic drawing of a coaxial filter according to this invention, with part of an outer member partly broken away,
  • FIGURE 2 is a simplified drawing of a modification
  • FIGURE 3 is a simplified drawing of a second modification.
  • a main coaxial transmission line is provided along which the high-frequency electromagnetic energy is propagated, the line' comprising inner and outer conductors 1 and 2 respectively.
  • the coaxial line is surrounded by a septate coaxial waveguide ice formed by the outer member or tube 2 of the coaxial line, a member or tube 3 which surrounds and is concentric with the tube 2, and one or more septa 4 joining the tubes 2 and 3.
  • Slots 5 are provided in the tube 2 to couple harmonic power from the coaxial line to the waveguide.
  • Other coupling means such as holes, probes or loops could be used.
  • the filter is designed so that at the fundamental frequency only the TEM mode can propagate in the main coaxial line, and no energy can propagate in the septate Waveguides, while the dominant transverseelectric mode can propagate in the waveguides at the second (and higher) harmonic frequencies.
  • the region between tubes 2 and 3 is provided with means such as 6 for absorbing the harmonic power.
  • the absorbing means 6 may take the form of strips, wedges or cylinders of lossy material, such as iron, carbon or water.
  • the members 2, 3 forming the waveguide need not be coaxial, but may be eccentric, as shown in FIGURES 2 and 3, when they are shown as lunar lines.
  • FIGURE 2 one septum 4 is shown.
  • FIGURE 3 the members 2, 3 are in line contact at 7 and this effectively forms a septum.
  • the peak and average power rating of the filter can be made about the same as that of a coaxial transmission line of the same outer diameter as that of member 2.
  • a high power harmonic frequency suppression filter comprising:
  • a coaxial transmission line having an inner and outer conductor, said coaxial transmission line being dimensioned such that at the fundamental frequency of said filter only the TEM modes can propagate therein;
  • connecting means connecting the outer conductor of said coaxial line to said waveguide to prevent the TEM mode at said fundamental frequency from propagating in said waveguide
  • said connecting means including at least one conducting septum coupling the outer conductor of said coaxial transmission line to said waveguide;
  • energy absorption means mounted within said waveguide to absorb harmonic frequencies.
  • a high power harmonic frequency suppression filter according to claim 1 wherein said connecting means includes at least two conducting septa coupling the outer conductor of said coaxial transmission line to said waveguide.
  • a high power harmonic frequency suppression filter comprising:
  • a coaxial transmission line having an inner and outer conductor, said coaxial transmission line being dimensioned such that at the fundamental frequency of said filter only the TEM modes can propagate therein;
  • connecting means including means joining the outer conductor of said coaxial transmission line to said waveguide along a line substantially parallel to the longitudinal axis of said waveguide to form a lunar waveguide;
  • a high power harmonic frequency suppression filter according to claim 3 wherein said waveguide is dimensioned such that it is cut off at the fundamental frequency of said filter.
  • a high power harmonic frequency suppression filter according to claim 3 wherein said electrically coupling means includes slots in the outer conductor of said coaxial transmission line for propagating energy out of said coaxial transmission line and into said Waveguide.
  • a high power harmonic frequency suppression filter according to claim 3 wherein said energy that is propagated out of said coaxial transmission line and into said waveguide is energy at said harmonic frequencies.
  • a high power harmonic frequency suppression filter according to claim 3 wherein said absorbing means includes strips of lossy material mounted within said waveguide for absorbing said harmonic frequencies.

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US412638A 1963-12-06 1964-11-20 High-power harmonic suppression filters Expired - Lifetime US3496497A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU38537/63A AU279199B2 (en) 1964-08-03 Improvements in highpower harmonic suppression filters

Publications (1)

Publication Number Publication Date
US3496497A true US3496497A (en) 1970-02-17

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US412638A Expired - Lifetime US3496497A (en) 1963-12-06 1964-11-20 High-power harmonic suppression filters

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US (1) US3496497A (de)
BE (1) BE656711A (de)
CH (1) CH423018A (de)
GB (1) GB1061229A (de)
NL (1) NL6414180A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673522A (en) * 1971-04-05 1972-06-27 Northern Electric Co Microwave balanced external cavity rejection filter
US4017760A (en) * 1975-01-14 1977-04-12 Thomson-Csf Parasitic oscillation suppressor for electronic tubes
US4540960A (en) * 1984-02-09 1985-09-10 The United States Of America As Represented By The United States Department Of Energy Monochromatic radio frequency accelerating cavity
US4926145A (en) * 1988-12-16 1990-05-15 Flam & Russell, Inc. Radial power combiner/divider with mode suppression
EP0772252A1 (de) * 1995-11-03 1997-05-07 Thomson-Csf Hohlleiter-Oberwellenfilter
CN112042049A (zh) * 2018-05-08 2020-12-04 瑞典爱立信有限公司 包括具有插入式滤波器装置的波导管的波导段
WO2023186621A1 (en) * 2022-03-28 2023-10-05 Sweden Quantum Ab A filter arrangement for quantum processors
SE2430303A1 (en) * 2024-05-29 2025-10-14 Sweden Quantum Ab A microwave filter arrangement comprising a frequency selective surface

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106768A (en) * 1934-09-25 1938-02-01 American Telephone & Telegraph Filter system for high frequency electric waves
US2877434A (en) * 1945-11-19 1959-03-10 Harold K Farr Mode filter
US2961619A (en) * 1957-06-21 1960-11-22 Sperry Rand Corp Microwave filter
US3160826A (en) * 1962-03-22 1964-12-08 Bell Telephone Labor Inc Microwave amplifier and oscillator utilizing negative resistance device
US3221205A (en) * 1962-05-23 1965-11-30 Hughes Aircraft Co Traveling-wave tube with trap means for preventing oscillation at unwanted frequencies
US3230481A (en) * 1959-09-30 1966-01-18 David J Lewis Method for segregating harmonic power in a waveguide system
US3353123A (en) * 1965-09-01 1967-11-14 Gen Electric Microwave filter comprising absorbing structures for removing suprious wave energy

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106768A (en) * 1934-09-25 1938-02-01 American Telephone & Telegraph Filter system for high frequency electric waves
US2877434A (en) * 1945-11-19 1959-03-10 Harold K Farr Mode filter
US2961619A (en) * 1957-06-21 1960-11-22 Sperry Rand Corp Microwave filter
US3230481A (en) * 1959-09-30 1966-01-18 David J Lewis Method for segregating harmonic power in a waveguide system
US3160826A (en) * 1962-03-22 1964-12-08 Bell Telephone Labor Inc Microwave amplifier and oscillator utilizing negative resistance device
US3221205A (en) * 1962-05-23 1965-11-30 Hughes Aircraft Co Traveling-wave tube with trap means for preventing oscillation at unwanted frequencies
US3353123A (en) * 1965-09-01 1967-11-14 Gen Electric Microwave filter comprising absorbing structures for removing suprious wave energy

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673522A (en) * 1971-04-05 1972-06-27 Northern Electric Co Microwave balanced external cavity rejection filter
US4017760A (en) * 1975-01-14 1977-04-12 Thomson-Csf Parasitic oscillation suppressor for electronic tubes
US4540960A (en) * 1984-02-09 1985-09-10 The United States Of America As Represented By The United States Department Of Energy Monochromatic radio frequency accelerating cavity
US4926145A (en) * 1988-12-16 1990-05-15 Flam & Russell, Inc. Radial power combiner/divider with mode suppression
EP0772252A1 (de) * 1995-11-03 1997-05-07 Thomson-Csf Hohlleiter-Oberwellenfilter
FR2740909A1 (fr) * 1995-11-03 1997-05-09 Thomson Csf Filtre d'harmoniques en guide d'onde
CN112042049A (zh) * 2018-05-08 2020-12-04 瑞典爱立信有限公司 包括具有插入式滤波器装置的波导管的波导段
CN112042049B (zh) * 2018-05-08 2021-10-22 瑞典爱立信有限公司 包括具有插入式滤波器装置的波导管的波导段
US11611135B2 (en) 2018-05-08 2023-03-21 Telefonaktiebolaget Lm Ericsson (Publ) Waveguide section comprising waveguide tubes with plug-in filter devices
WO2023186621A1 (en) * 2022-03-28 2023-10-05 Sweden Quantum Ab A filter arrangement for quantum processors
SE2430303A1 (en) * 2024-05-29 2025-10-14 Sweden Quantum Ab A microwave filter arrangement comprising a frequency selective surface
SE547552C2 (en) * 2024-05-29 2025-10-14 Sweden Quantum Ab A microwave filter arrangement comprising a frequency selective surface

Also Published As

Publication number Publication date
NL6414180A (de) 1965-06-07
CH423018A (de) 1966-10-31
BE656711A (de) 1965-06-08
GB1061229A (en) 1967-03-08

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AS Assignment

Owner name: ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE;REEL/FRAME:004718/0023

Effective date: 19870311