EP0113793B1 - Résonateur coaxial - Google Patents

Résonateur coaxial Download PDF

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Publication number
EP0113793B1
EP0113793B1 EP19830100388 EP83100388A EP0113793B1 EP 0113793 B1 EP0113793 B1 EP 0113793B1 EP 19830100388 EP19830100388 EP 19830100388 EP 83100388 A EP83100388 A EP 83100388A EP 0113793 B1 EP0113793 B1 EP 0113793B1
Authority
EP
European Patent Office
Prior art keywords
coaxial resonator
electrode
rotor
main body
face
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
Application number
EP19830100388
Other languages
German (de)
English (en)
Other versions
EP0113793A1 (fr
Inventor
Hideyuki Miyake
Tosiaki Nakamura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to EP19830100388 priority Critical patent/EP0113793B1/fr
Priority to DE8383100388T priority patent/DE3373596D1/de
Publication of EP0113793A1 publication Critical patent/EP0113793A1/fr
Application granted granted Critical
Publication of EP0113793B1 publication Critical patent/EP0113793B1/fr
Expired 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

Definitions

  • the present invention relates to a coaxial resonator which comprises: a coaxial resonator main body including a cylindrical dielectric member, an electrode layer continuously formed over an inner peripheral surface, an outer peripheral surface and one end face of said dielectric member.
  • Such a coaxial resonator is known from DE-C-816 428 for use in a resonant circuit to be applied to UHF technics.
  • This known coaxial resonator is compact in size and especially adapted to be used for very short waves and consists of a main body including a cylindrical dielectric member and an electrode layer which is continuously formed over an inner peripheral surface, an outer peripheral surface and one end face of the cylindrical dielectric member.
  • coaxial resonators With respect to coaxial resonators to be used for electrical and electronic equipment which operate, for example, in UHF ranges, it has been a recent trend that a 1/4 wavelength coaxial resonator (referred to as a A/4 coaxial resonator hereinbelow) compact in size and composed of a dielectric member having a high unloaded Q begins to be adopted.
  • a 1/4 wavelength coaxial resonator referred to as a A/4 coaxial resonator hereinbelow
  • its resonance frequency can not be readily altered, thus requiring much time for the adjustments thereof.
  • a coaxial resonator 2 constituted by the cylindrical dielectric member, and having electrode layers formed on inner and outer peripheral surfaces and also on one end face of the dielectric member by a metallizing process or the like, is mounted on a printed circuit board 1, while a trimmer capacitor 3 is disposed in the vicinity of the coaxial resonator 2, with a ground terminal 4 of the trimmer capacitor 3 being connected to the electrode formed on the inner peripheral surface of the coaxial resonator 2.
  • the coaxial resonator according to the present invention is characterized by a stator electrode formed on one of the end faces of said dielectric member, and a rotor member of a dielectric material rotatably held in close contact with said end face of said coaxial resonator main body on which said stator electrode is formed, and provided with a rotor electrode confronting said stator electrode, said coaxial resonator being arranged to vary capacity between said stator electrode and said rotor electrode by rotating said rotor member.
  • the coaxial resonator in accordance with the present invention is capable of efficiently varying the resonance frequency with a minimum deterioration of the unloaded Q.
  • the coaxial resonator 5 generally includes a cylindrical dielectric member 6 (Fig. 5) composed, for example, of a ceramic material or the like as a resonator main body, and formed with a central axial bore 6h extending therethrough, an electrode layer 7 including an inner electrode or conductor 7a formed on an inner peripheral surface of the axial bore 6h of the dielectric member 6, an outer electrode or conductor 7b formed on an outer peripheral surface of the dielectric member 6, and an end face electrode or conductor 7c formed on one end face of the dielectric member 6, all of which electrodes are continuously applied onto said dielectric member 6 by a metallizing process and the like, a pair of opposed stator electrode layers 8a and 8b (Fig.
  • annular rotor 10 of a dielectric material provided with a sector-shaped rotor electrode 9 formed on its one surface along a peripheral edge of a central opening 10h thereof so as to correspond to the stator electrodes 8a and 8b of the dielectric member 6, and disposed in close contact with the end face 6e of the dielectric member 6, and a shaft 14 with a head portion 13, inserted into the inner electrode 7a formed in the axial bore 6h of the dielectric member 6 through a spring member 12 having a pair of holes 11 to receive an adjusting tool 16 (Fig.
  • the configuration of the dielectric member 6 is not limited to the cylindrical shape as described in the foregoing embodiment, but may be modified into various shapes, for example, into a square tube-like configuration, etc.
  • the coaxial resonator 5 as described so far may be represented by the equivalent circuit surrounded by dotted lines in Fig. 7, in which a capacity C formed between the outer peripheral surface and inner peripheral surface of the dielectric member 6 for the electrode 7, and inductance L of the electrode layer 7 are coupled in parallel relation with each other.
  • a variable capacity C T obtained by the stator electrodes 8a and 8b of the coaxial resonator 5 and the rotor electrode 9 of the rotor 10 forms a circuit to be connected in parallel with the above parallel circuit, thus a resonance circuit capable of varying the resonance frequency is constituted.
  • the arrangement of the embodiment described so far may be further modified, for example, in such a manner that, with the spring member 12 omitted, by forming the adjusting tool receiving holes 11 directly in the rotor 10, the rotor 10 is held in pressure contact with the end face 6e of the dielectric coaxial resonator 5 through the head portion 13 of the shaft 14.
  • the coaxial resonator 5B also includes the cylindrical dielectic member 6B composed, for example, of a ceramic material or the like as a resonator main body, and formed with the central axial bore 6Bh extending therethrough, the electrode layer 7B including the inner electrode or conductor 7Ba formed on the inner peripheral surface of the axial bore 6Bh of the dielectric members 6B, the outer electrode or conductor 7Bb formed on the outer peripheral surface of the dielectric member 6B, and the end face electrode or conductor 7Bc formed on one end face of the dielectric member 6B, all of which are continuously applied onto said dielectric member 6B by a metallizing process and the like generally in the similar manner as in the embodiment of Figs. 2 through 8 so far.
  • the cylindrical dielectic member 6B composed, for example, of a ceramic material or the like as a resonator main body, and formed with the central axial bore 6Bh extending therethrough
  • the electrode layer 7B including the inner electrode or conductor 7Ba formed on the inner
  • an annular internal electrode 7B1 concentrically formed around the peripheral edge of the axial bore 6Bh and connected to the inner electrode 7Ba of the electrode 7B, and a sector-shaped stator electrode 8B formed around the outer peripheral edge of the dielectric member 6B and connected to the outer electrode layer 7Bb of the electrode 7B are respectively provided.
  • a groove 13B2 is formed for receiving therein an end of an adjusting tool or screw driver and the like (not particularly shown) for capacity adjustment.
  • a spring member S having a pair of terminal lugs t extending outwardly therefrom is fixed, for example, by staking or threading engagement, and thus, the rotor 10B is held in close contact with the end face 6Be of the coaxial resonator 5B through proper resiliency, with the contact electrode 10B1 (Fig. 13) of the rotor 10B electrically contacting the annular internal electrode 7B1 of the resonator 5B.
  • the spring member S is electrically connected with the rotor electrode 9B of the rotor 10B through the terminal lugs t thereof.
  • the coaxial resonator 5B described so far with reference to Figs. 9 through 14 may be represented by the equivalent circuit as shown in Fig. 7, in the similar manner as in the embodiment of Figs. 2 to 8, and upon rotation of the rotor 10B through the shaft 13B, the capacity at the open side of the coaxial resonator 5B may be varied, thereby to change the resonance frequency thereof as desired.
  • the coaxial resonator of the present invention only parts required for functioning as a trimmer capacitor are the resonator main body, rotor and shaft, and thus, the coaxial resonator capable of varying resonance frequency may be constituted by the extremely small number of parts involved, with a consequent simplification of assembly and reduction in cost, while, owing to the arrangement in which the stator electrode is continued to the electrode of the coaxial resonator main body, not only loss is very small as a coaxial resonator dealing with high frequencies, but alterations of resonance frequency may be positively effected in a simple manner, with substantial elimination of disadvantages inherent in the conventional coaxial resonators of this kind.

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Claims (5)

1. Résonateur coaxial (5) comprenant un corps principal constitué par un élément diélectrique cylindrique (6), ainsi qu'une couche à électrodes (7) s'étendant de façon continue sur une surface latérale interne, une surface latérale externe et une face terminale de l'élément diélectrique (6), caractérisé par une électrode de stator (8a, 8b), formée sur l'autre face terminale (6e) de l'élément diélectrique (6), et par un rotor (10) en matériau diélectrique, qui est maintenu intimement en contact avec l'autre face terminale (6e) du corps principal, sur laquelle est formée l'électrode de stator (8a, 8b), tout en étant rotatif par rapport à cette autre face, le rotor étant muni d'une électrode de rotor (9) faisant face à l'électrode de stator (8a, 8b), avec laquelle elle forme une capacité qui est variable par la rotation du rotor (10) par rapport au corps principal du résonateur (5).
2. Résonateur selon la revendication 1, dans lequel le rotor (10) est monté rotatif sur le corps principal du résonateur au moyen d'un axe (14) qui traverse le corps principal et le rotor (10).
3. Résonateur selon la revendication 1 ou 2, dans lequel le rotor (10) est maintenu pressé contre le corps principal du résonateur par une ressort (12).
4. Résonateur selon la revendication 2, dans lequel l'axe (14) est accouplé en rotation au rotor (10) et est pourvu d'un creux (11) pour l'engagement d'un outil (16) servant au réglage de la capacité.
5. Résonateur selon la revendication 1, dans lequel l'autre face terminale (6Be) du corps principal du résonateur présente en outre une électrode intérieure (7B1) qui est reliée à l'électrode interne formée par la couche à électrodes (7B) sur la surface latérale interne du corps principal du résonateur, le rotor (10B) étant muni d'une électrode de contact (1 OB1 ) reliée à ladite électrode de rotor (9B) et servant à l'établissement d'un contact électrique avec ladite électrode interne (7B1) du corps principal du résonateur coaxial.
EP19830100388 1983-01-18 1983-01-18 Résonateur coaxial Expired EP0113793B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19830100388 EP0113793B1 (fr) 1983-01-18 1983-01-18 Résonateur coaxial
DE8383100388T DE3373596D1 (en) 1983-01-18 1983-01-18 Coaxial resonator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830100388 EP0113793B1 (fr) 1983-01-18 1983-01-18 Résonateur coaxial

Publications (2)

Publication Number Publication Date
EP0113793A1 EP0113793A1 (fr) 1984-07-25
EP0113793B1 true EP0113793B1 (fr) 1987-09-09

Family

ID=8190239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830100388 Expired EP0113793B1 (fr) 1983-01-18 1983-01-18 Résonateur coaxial

Country Status (2)

Country Link
EP (1) EP0113793B1 (fr)
DE (1) DE3373596D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0338101A (ja) * 1989-07-04 1991-02-19 Murata Mfg Co Ltd 高周波同軸共振器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL62431C (fr) * 1944-05-24 1949-01-15
DE816428C (de) * 1949-07-24 1951-10-11 Siemens & Halske A G Topfkreis und koaxialer Resonator
US4223287A (en) * 1977-02-14 1980-09-16 Murata Manufacturing Co., Ltd. Electrical filter employing transverse electromagnetic mode coaxial resonators
IT1131598B (it) * 1980-07-16 1986-06-25 Telettra Lab Telefon Cavita' per microonde stabili in temperatura
JPS57124902A (en) * 1981-01-26 1982-08-04 Toyo Commun Equip Co Ltd Filter for semicoaxial cavity resonator

Also Published As

Publication number Publication date
DE3373596D1 (en) 1987-10-15
EP0113793A1 (fr) 1984-07-25

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