US3786371A - Means for coupling a cavity resonator to a conductor circuit and/or a further cavity resonator - Google Patents

Means for coupling a cavity resonator to a conductor circuit and/or a further cavity resonator Download PDF

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Publication number
US3786371A
US3786371A US00287031A US3786371DA US3786371A US 3786371 A US3786371 A US 3786371A US 00287031 A US00287031 A US 00287031A US 3786371D A US3786371D A US 3786371DA US 3786371 A US3786371 A US 3786371A
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Prior art keywords
tongue
coupling
cavity resonator
coupling window
resonator
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Expired - Lifetime
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US00287031A
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English (en)
Inventor
J Hadbavny
P Fuglister
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Siemens Schweiz AG
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Siemens Albis AG
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    • 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

  • the coupling window or opening possesses a cross-section which at least approaches a U- or V- shape having a tongue, the axis of symmetry of which is at least approximately parallel to the vector of the electrical field of the resonator at the region of the coupling window or opening.
  • the length of the tongue is chosen such that the tongue together with the coupling window forms a 7 ⁇ /4 resonant circuit working with the. TEM-mode.
  • the method of tuning the coupling according to the invention contemplates bending or rotating the tongue so as to change the coupling factor.
  • the present invention relates to a new and improved means for coupling a cavity resonator to an energy transmission device, such as a conductor circuit or a further cavity resonator and to a method of tuning such coupling.
  • this constructional embodiment has the drawback that owing to the coupling there are energized different undesired modes.
  • Another and more specific object of the present invention aims at the provision of a coupling between a cavity resonator and a conductor circuit or a further cavity resonator which does not transmit any undesired modes.
  • the inventive coupling is manifested by the features that the coupling window or opening possesses a cross-section which at least approaches a substantially U- or V-shaped configuration and has a tongue, the axis of symmetry of which is directed at least approximately parallel to the vector of the electrical field of the resonator at the region of the coupling window or opening.
  • the length of the tongue is selected such that the tongue together with the coupling window forms a M4 resonant circuit operating with the TEM-mode.
  • the transmission to a coaxialor strip-line can be realized in a very simple manner in that between the tongue and the internal conductor of the line there is produced a hybrid coupling or a galvanic connection.
  • the technique for tuning the coupling contemplates displacing the tongue, namely bending or rotating same, so as to change the coupling factor.
  • FIG. I illustrates a cavity resonator coupled to a strip-line or conductor as viewed substantially along the line [-1 of FIG. IA;
  • FIG. IA illustrates the cavity resonator arrangement depicted in FIG. 1;
  • FIG. 2 illustrates a cavity resonator coupled to a coaxial line as viewed substantially along the line IIII of FIG. 2A;
  • FIG. 2A illustrates the cavity resonator arrangement depicted in FIG. 2;
  • FIG. 3 illustrates a cavity resonator coupled to a waveguide as viewed substantially along the line III-III of FIG. 3;
  • FIG. 3A illustrates the cavity resonator arrangement depicted in FIG. 3
  • FIG. 4 illustrates a cavity resonator coupled with a diode as viewed substantially along the line IV-IV of FIG. 4A;
  • FIG. 4A illustrates the cavity resonator arrangement of FIG. 4
  • FIGS. 5 to 8 inclusive respectively illustrate on an enlarged scale different coupling windows or openings
  • FIG. 9 illustrates a cavity resonator coupled with a diode and constituting a hybrid coupler and as viewed substantially along the line IX-IX of FIG. 9A;
  • FIG. 9A illustrates the cavity resonator arrangement of FIG. 9
  • FIG. I0 illustrates a modified arrangement of cavity resonator coupled with a semiconductor element or microwave detector element as viewed substantially along the line X)( of FIG. 10A;
  • FIG. 10A illustrates the cavity resonator arrangement of FIG. I0.
  • the cavity resonator 3 illustrated in FIG. 1 is provided for the excitation of a TEOlnmode, wherein the electrical field ER extends concentrically with respect to the wall of the cavity.
  • the jacket of the circular cavity resonator 3 is provided at its outside with a flat surface 3a which, for instance, can be produced by milling or otherwise suitably machining the jacket until reaching a lesser thickness of the wall.
  • the wall is pierced by a substantially U- shaped coupling window or opening 1.
  • the U-shape of this coupling opening 1 is formed by a rectangular opening having an inwardly protruding tongue 2, as such has been illustrated on an enlarged scale in FIG. 5.
  • the coupling window or opening 1 is arranged such that the symmetry axis A of the tongue 2 is disposed parallel to the vector of the electrical field ER which is present at the resonator at the region of the coupling window 1.
  • the length of the tongue 2 is chosen such that together with the coupling window it forms a M4- resonant circuit operating with the TEM-mode.
  • a non-symmetrical strip line 4 is arranged relative to the tongue 2 such that the strip-shaped line or conductor of the strip-line 4 extends at a small spacing parallel to the axis of symmetry A of the tongue 2.
  • the strip-line 4 together with the tongue 2 forms a hybrid coupler.
  • the surface conductor 8 defined by the strip-line 4 is galvanically connected with the resonator mass or body.
  • the conductor 5 is galvanically connected with the tongue 2.
  • the resonator 3 depicted in the embodiment of FIG. 2 corresponds to that of FIG. 1. However, it possesses a circular coupling window or opening 1 with the inwardly protruding or projecting tongue 2, as such has been shown on an enlarged scale in FIG. 8.
  • a coaxial line 10 with an internal conductor 12 and an outer sleeve or jacket 11 is coupled to the resonator 3.
  • the internal conductor 12 is welded to the tongue 2 and the outer sleeve or jacket 11 is welded to the surface 6.
  • the internal conductor 12 of the coaxial line 10 is arranged at a slight spacing from the tongue 2 parallel to the axis of symmetry A of such tongue.
  • the internal conductor 12 together with the tongue 2 forms a hybrid coupler.
  • the resonator 3 illustrated in the exemplary embodiment of FIG. 3 corresponds to that of FIG. 1. However, in this case it possesses a V-shaped coupling window or opening 1, as such has been illustrated in FIG. 7 on an enlarged scale.
  • the resonator 3 is coupled with a rectangular waveguide 21.
  • the waveguide 21 is mounted at the end at the jacket or wall of the resonator 3 and suitably connected therewith.
  • the cross-section of the waveguide 21 is directed such that the vector of the electrical field EW of the HlO-mode at the waveguide 21 is disposed parallel to the vector of the resonator field ER at the coupling window or opening 1.
  • FIG. 4 there is illustrated the coupling of a diode 31 at the cavity resonator 3.
  • the coupling window or opening 1 possesses a circular-shaped cross-section with an inwardly protruding tongue 2.
  • the axis of symmetry A of the tongue 2 is again directed parallel to the vector of the electrical field ER in the resonator 3 at the coupling window or opening 1.
  • a crystal diode 31 At the edge of the window opposite the tongue 2 there is mounted a crystal diode 31, as best seen by referring to FIG. 4.
  • the one diode connection or terminal consisting of a wire 32, is connected in a high-frequency manner with the tongue 2.
  • the second connection or terminal is formed by a metal coating or layer 33 vapor deposited at the diode body. This metal coating or layer 33 bears against the edge of the window or opening 1, so that there is produced the contact with the resonator mass.
  • FIGS. 9 and 9A a different coupling arrangement wherein coupling of the semiconductor, here in the form of a diode 31, occurs by means of a so-called hybrid coupler, in other words a coupler wherein the coupling action occurs partially inductively and partially capacitively.
  • a connection or terminal 36 of the diode 31 is guided at a small spacing from the tongue 2 parallel to the axis of symmetry thereof.
  • an insulating plate 35 In order to maintain such spacing there is bonded to the outside surface of the resonator 3 an insulating plate 35.
  • the extended connection or terminal 36 of the diode 31 is secured to this insulating plate 35.
  • the coupling does not occur exclusively via the connection or terminal 36, rather partially by means of the diode 31 itself because such is located at the field 37 concentrated about the tip of the tongue 2.
  • FIGS. 10 and 10A illustrate a cavity resonator arrangement wherein a microwave detector element 31 such as a conventional diode, bolometer, thermistor, is arranged in the region of the concentrated field at the neighborhood of the tip of the tongue 2 wherein such microwave detector element is influenced in known manner by such field.
  • a microwave detector element 31 such as a conventional diode, bolometer, thermistor
  • This arrangement can be employed whenever a small coupling action is sufficient.
  • the tongue 2 possesses a semi-circular shaped end portion 41 and side or end surfaces 42 and 43 parallel to the axis of symmetry A. Both side surfaces 42, 43 transform at the root of the tongue 2 in the form of cylindrical jacket or wall surfaces 44, 45, respectively, into the circular-shaped window or opening 1.
  • the spacing d2 of the end portion 41 of the tongue 2 with regard to the oppositely situated edge of the window 1 and the diameter d3 of the respective cylindrical jackets 44 and 45 are equal to the width d1 of the tongue 2.
  • the sum from the diameter D of the window or opening 1 and one-half of the width done-half of the tongue 2 is equal to or smaller than one-quarter of the wavelength (A4).
  • the tongue 2 must be accordingly selected to be shorter than the theoretical length M4. The reason for such shortening appears to be that as the effective capacitance there is also present the stray capacitance of the tongue 2.
  • FIG. 6 there is disclosed a coupling or window opening 1 having a substantially oval cross-section and equipped with the inwardly protruding tongue 2.
  • the invention also provides the possibility of tuning the coupling by changing the positional orientation of the tongue so as to alter the coupling factor, for instance by bending or rotating such tongue.
  • Means for coupling a cavity resonator to an at least two terminal semiconductor element wherein a coupling window is present at the wall between the cavity resonator and the semiconductor element, said coupling window possessing a predetermined cross-section and having a tongue, the axis of symmetry of the tongue extending at least approximately parallel to the vector of the electrical field of the resonator at the region of the coupling window, the length of said tongue being selected such that the tongue together with the coupling window forms a M4 resonant circuit operating with the TEM-mode, and wherein at least one terminal of said semiconductor element is located at a small spacing from the tongue at least approximately parallel to the axis of symmetry of the tongue and forms therewith a hybrid coupler.
  • Means for coupling a cavity resonator to an at least two terminal semiconductor element wherein a cou pling window is present at the wall between the cavity resonator and the semiconductor element, said coupling window possessing a predetermined cross-section and having a tongue, the axis of symmetry of the tongue extending at least approximately parallel to the vector of the electrical field of the resonator at the region of the coupling window, the length of said tongue being selected such that the tongue together with the coupling window forms a M4 resonant circuit operating with the TEM-mode, and wherein at least one terminal of said semiconductor element is galvanically connected with the tongue.
  • a coupling window is present at the wall between the cavity resonator and the microwave detector element, said coupling window possessing a predetermined cross-section and having a tongue, the axis of symmetry of the tongue extending at least approximately parallel to the vector of the electrical field of the resonator at the region of the coupling window, the length of said tongue being selected such that the tongue together with the coupling window forms a ) ⁇ /4 resonant circuit operating with the TEM- mode, and wherein said microwave detector element is arranged at and energized by the near field about the tip of the tongue.
  • Patent No. 3,786,371 Dated January 15, 1974 Invent-(5) Jozef Hadbavny and Peter Fuglister It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as. shown below:

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US00287031A 1971-10-14 1972-09-07 Means for coupling a cavity resonator to a conductor circuit and/or a further cavity resonator Expired - Lifetime US3786371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1508071A CH533368A (de) 1971-10-14 1971-10-14 Schaltungsanordnung mit einem Hohlraumresonator

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US3786371A true US3786371A (en) 1974-01-15

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US00287031A Expired - Lifetime US3786371A (en) 1971-10-14 1972-09-07 Means for coupling a cavity resonator to a conductor circuit and/or a further cavity resonator

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US (1) US3786371A (enrdf_load_stackoverflow)
CH (1) CH533368A (enrdf_load_stackoverflow)
DE (1) DE2154657C3 (enrdf_load_stackoverflow)
FR (1) FR2156641B1 (enrdf_load_stackoverflow)
GB (1) GB1403423A (enrdf_load_stackoverflow)
IT (1) IT968710B (enrdf_load_stackoverflow)
NL (1) NL7213917A (enrdf_load_stackoverflow)
SE (1) SE387010B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211987A (en) * 1977-11-30 1980-07-08 Harris Corporation Cavity excitation utilizing microstrip, strip, or slot line
WO1992013371A1 (en) * 1991-01-17 1992-08-06 Valtion Teknillinen Tutkimuskeskus Assembly and method for coupling a microstrip circuit to a cavity resonator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528343C2 (de) * 1995-08-02 1997-05-22 Markus Muehleisen Vorrichtung zur reflexionsarmen Absorption von Mikrowellen
DE19807593A1 (de) * 1997-07-31 1999-02-04 Mikrowellen Technologie Und Se Abstandsmeßvorrichtung und Verfahren zur Bestimmung eines Abstands
US6452141B1 (en) * 2001-06-30 2002-09-17 Samsung Electronics Co., Ltd. Microwave oven with magnetic field detecting device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423130A (en) * 1944-03-25 1947-07-01 Bell Telephone Labor Inc Switching device in wave guide transmission system
US2560353A (en) * 1945-03-16 1951-07-10 Bell Telephone Labor Inc Cavity resonator
GB655045A (en) * 1947-12-04 1951-07-11 Mini Of Supply Improvements in aerial systems
FR1015163A (fr) * 1950-02-06 1952-08-28 Sadir Carpentier Système d'antenne encastrée
US2877429A (en) * 1955-10-06 1959-03-10 Sanders Associates Inc High frequency wave translating device
US3160826A (en) * 1962-03-22 1964-12-08 Bell Telephone Labor Inc Microwave amplifier and oscillator utilizing negative resistance device
US3448414A (en) * 1967-05-16 1969-06-03 Us Army Fast recovery switch limiter circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE482709A (enrdf_load_stackoverflow) * 1944-02-14
DE1112593B (de) * 1959-11-14 1961-08-10 Philips Patentverwaltung HF-Strahler fuer Diathermie- und Therapiezwecke

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423130A (en) * 1944-03-25 1947-07-01 Bell Telephone Labor Inc Switching device in wave guide transmission system
US2560353A (en) * 1945-03-16 1951-07-10 Bell Telephone Labor Inc Cavity resonator
GB655045A (en) * 1947-12-04 1951-07-11 Mini Of Supply Improvements in aerial systems
FR1015163A (fr) * 1950-02-06 1952-08-28 Sadir Carpentier Système d'antenne encastrée
US2877429A (en) * 1955-10-06 1959-03-10 Sanders Associates Inc High frequency wave translating device
US3160826A (en) * 1962-03-22 1964-12-08 Bell Telephone Labor Inc Microwave amplifier and oscillator utilizing negative resistance device
US3448414A (en) * 1967-05-16 1969-06-03 Us Army Fast recovery switch limiter circuit

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Allen et al., On the Theory of Strongly Coupled Cavity Chains MTT 8, 5 1960 pp. 362 372. *
Ragen, G. L. Microwave Transmission Circuits, McGraw Hill, 1948, pp. 688 690. *
Southworth, G. C. Principles & Applications of Waveguide Transmission, D. Van Nostrand, 1950, pp. 254 255. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211987A (en) * 1977-11-30 1980-07-08 Harris Corporation Cavity excitation utilizing microstrip, strip, or slot line
WO1992013371A1 (en) * 1991-01-17 1992-08-06 Valtion Teknillinen Tutkimuskeskus Assembly and method for coupling a microstrip circuit to a cavity resonator

Also Published As

Publication number Publication date
SE387010B (sv) 1976-08-23
FR2156641A1 (enrdf_load_stackoverflow) 1973-06-01
CH533368A (de) 1973-01-31
DE2154657B2 (de) 1974-10-24
NL7213917A (enrdf_load_stackoverflow) 1973-04-17
FR2156641B1 (enrdf_load_stackoverflow) 1975-06-13
IT968710B (it) 1974-03-20
DE2154657A1 (de) 1973-04-19
GB1403423A (en) 1975-08-28
DE2154657C3 (de) 1975-06-05

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