KR20150028372A - Ceramic Resonator and Filter using thereof - Google Patents

Ceramic Resonator and Filter using thereof Download PDF

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Publication number
KR20150028372A
KR20150028372A KR20130103097A KR20130103097A KR20150028372A KR 20150028372 A KR20150028372 A KR 20150028372A KR 20130103097 A KR20130103097 A KR 20130103097A KR 20130103097 A KR20130103097 A KR 20130103097A KR 20150028372 A KR20150028372 A KR 20150028372A
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KR
South Korea
Prior art keywords
resonator
hole
substrate
ceramic
resonators
Prior art date
Application number
KR20130103097A
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Korean (ko)
Inventor
박종철
Original Assignee
(주)웨이브텍
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Publication date
Application filed by (주)웨이브텍 filed Critical (주)웨이브텍
Priority to KR20130103097A priority Critical patent/KR20150028372A/en
Publication of KR20150028372A publication Critical patent/KR20150028372A/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00Resonators of the waveguide type
    • H01P7/10Dielectric resonators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/201Filters for transverse electromagnetic waves
    • H01P1/205Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2056Comb filters or interdigital filters with metallised resonator holes in a dielectric block
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/207Hollow waveguide filters
    • H01P1/208Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2084Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/15Constructional features of resonators consisting of piezo-electric or electrostrictive material

Abstract

A U-shaped portion of a ceramic resonator of a high frequency filter and a filter using the U-shaped portion are plated on the inner and outer surfaces of the ceramic resonator, And a metal rod is moved up and down into the shape to facilitate tuning of the resonance frequency, and a filter using the ceramic resonator.
Conventional resonators have a structure in which a through hole is formed in the longitudinal direction of a rectangular parallelepiped made of ceramic having a high dielectric constant and a copper core is inserted into the through hole to remove a part of the conductive film formed on the inner and outer surfaces of the body, A cutout groove is formed in the longitudinal direction on at least two side surfaces of the through hole, and the metal bar is inserted by removing the coating on the inner circumferential inlet of the through hole.
However, in the conventional resonators as described above, since the conductive film on one side is completely removed, energy loss radiated to the outside is large, and at least two cut-out grooves are formed on the side surface of the resonator, There is a problem that it becomes higher. Another problem is that when a plurality of resonators are connected, the conductive coating on the surface of the resonator must be peeled off little by using a cutting tool or the like or a separate tuning means for coupling between the multiple resonators must be provided have.

Description

Technical Field [0001] The present invention relates to a ceramic resonator and a filter using the ceramic resonator.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic resonator structure of a RF (Radio Frequency) filter and a filter using the ceramic resonator structure. The U-shaped portion of the ceramic resonator is plated with inner and outer surfaces thereof, And a metal rod is vertically moved into the U-shaped portion to facilitate tuning of the resonance frequency, and a filter using the ceramic resonator.
A resonator of a filter (a dielectric filter, a cavity filter, a waveguide filter, etc.) for resonating in a specific frequency band is a circuit element resonating at a specific frequency by a combination of an inductor L and a capacitor C in an equivalent circuit. The resonator is provided in a receiving space such as a metallic cylinder or a rectangular parallelepiped surrounded by a conductor so that only an electromagnetic field having a natural frequency exists so that resonance is possible at a desired frequency.
1, a through hole 112 is formed in a longitudinal direction of a rectangular parallelepiped made of ceramic having a high dielectric constant, a conductive coating 111a is formed on the inner and outer surfaces of the body 111, One side of the body is constituted of a coating agent rejection 113 in which plating is completely removed. The conventional ceramic resonator 110 is connected to a transmission line of the substrate 115 through a copper core 114 inserted in the through hole and is separately connected to an additional circuit using a plurality of chip type capacitors or inductor elements .
However, in the conventional ceramic resonator 110 as shown in FIG. 1, the conductive coating on one side is completely removed and the loss of energy radiated to the outside is large, and when a plurality of resonators are connected, It is difficult to adjust the bonding amount because the conductive film must be adjusted using a tool such as a grinder to peel off the conductive film little by little, and the productivity of the product is also low because the conductive film once removed is difficult to regenerate.
As a technique for improving the prior art resonator shown in FIG. 1, Korean Patent No. 10-0368035 (name: small-sized unit ceramic resonator with easy multi-stage coupling) and No. 10-0354850 A band-pass filter using a small-sized ceramic resonator).
In this conventional resonator, a cutout groove 123a123d is formed in at least two sides of four sides of a ceramic resonator 120 having a through hole 122 formed at the center thereof, and a cut- 124 are formed so that the metal rod 125 is inserted into the through hole of the ceramic body 121 to adjust the resonance frequency by electromagnetic coupling with the resonator. In addition, a band-pass filter is formed by further including a metal case of a square shape and a cover 126 for accommodating therein a plurality of such ceramic resonators.
However, in the conventional ceramic resonator 120 as shown in FIG. 2, there is still a problem of removing the conductive coating at the inner peripheral portion of the through hole, and at least two cut-out grooves must be formed on the side surface of the resonator There is another problem that the manufacturing process is complicated and the cost is increased. In addition, when a band-pass filter is formed by connecting a plurality of resonators, a separate tuning means is required for coupling between the resonators, which complicates the structure.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the related art as described above, and it is an object of the present invention to provide a U-shaped portion of a ceramic resonator having a U- And a metal rod is vertically moved into the cavity to facilitate tuning of the resonance frequency, and a filter using the ceramic resonator.
In order to attain the above object, the present invention provides a ceramic resonator having a high dielectric constant ceramic resonator in which a through hole is formed in a central portion of a hexahedron and a conductive coating is formed on the inner and outer surfaces of the body, And a second substrate is connected to the upper portion of the resonator by a method such as soldering. A first substrate having the same structure and size as the second substrate after the U-shaped portion of the metal material is inserted into the hole of the second substrate, And a metal cover having a threaded hole formed at its center so as to move the metal rod up and down by a fixing nut is coupled to the upper portion of the first substrate, And the resonance frequency can be tuned by moving the metal rod up and down.
In addition, the present invention is characterized in that a plurality of the resonators are mounted on a metal housing divided into rectangular sections, and a cover made of a metal material having holes having threaded portions corresponding to the through holes of the resonators is coupled, Th resonator and the last resonator are respectively coupled to the input / output contactors, thereby providing a filter using a ceramic resonator.
As described above, the ceramic resonator according to the present invention is easier to fabricate, can reduce the manufacturing cost, and has an effect of easily tuning the resonance frequency as compared with the prior art. In addition, when a plurality of ceramic resonators are combined to form a filter, a modulated resonator assembly is mounted at a predetermined position of the housing, thereby facilitating the coupling of resonance periods.
1 is a structural view of a conventional ceramic resonator.
2 is a structural view of another ceramic resonator according to the prior art;
3 is a structural view of a ceramic resonator according to the present invention.
4 is a view showing an assembled state of the ceramic resonator according to the present invention.
5 is a cross-sectional view of a filter using a ceramic resonator according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 3 is a structural view of a ceramic resonator according to the present invention, and FIG. 4 is a view showing an assembled state of the ceramic resonator according to the present invention.
3 and 4, a ceramic resonator 200 according to the present invention includes a ceramic resonator 200 having a through hole 202 formed in the center of a hexahedron in the longitudinal direction thereof and a high- A second substrate 209 having a hole having the same diameter as that of the through hole formed at the center thereof and connected to the upper portion of the resonator by soldering or the like; A first substrate 207 having the same structure and size as the second substrate and coupled to cover the U-shaped portion inserted into the second substrate; And a metal cover 206 having a structure and a size and a threaded hole formed in the center of the metal substrate 206 so that the metal rod 206 is moved up and down by the fixing nut 204.
With this structure, the ceramic resonator according to the present invention has a ceramic body 201 having a hexagonal high dielectric constant ceramic body 201 having a through hole 202 formed in its longitudinal direction at its central portion and a conductive film formed on the inner and outer surfaces thereof, Shaped portion 208 is inserted into the hole of the second substrate and then a U-shaped portion having the same structure and size as the second substrate is connected to the second substrate 209, The first substrate 207 is coupled to the first substrate 207 to cover the first substrate 207.
Then, a cover 206 is coupled to an upper portion of the first substrate 210 having the same structure and size as those of the first and second substrates. At this time, a hole having a screw thread is formed at the center of the cover, So that the resonance frequency tuning becomes possible by moving the metal rod 206 coupled by the up and down movement.
5 is a cross-sectional view of a filter using the ceramic resonator according to the present invention. 5, a plurality of resonators are mounted on a metal housing 210 divided into rectangular sections, and a plurality of holes are formed in the metal housing 210 to correspond to the through holes of the resonators. (206) are coupled. In addition, the first resonator and the last resonator of the resonator are configured to be coupled to the input / output contactor 211, respectively, so that the filter is assembled using a plurality of ceramic resonators.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be apparent to those of ordinary skill in the art.
110, 120, 200. Ceramic resonator 111, 121, 201. Body
112, 122, 202. Through holes 113, 124. Rejection
114. Copper core 115. Substrate
123a-123d. Cutting grooves 125, 205. Metal rods
126. 206. Cover 203. Plating part
204. Fixing nut 207. First substrate
208. U-shaped portion 209. Second substrate
210. Housing 211. Connector

Claims (4)

  1. A ceramic resonator having a high dielectric constant with a through hole formed in the center of a hexahedron in the longitudinal direction and a conductive coating formed on the inner and outer surfaces of the body,
    A second substrate having a hole in the center thereof and having the same diameter as the through hole and connected to an upper portion of the resonator;
    A U-shaped portion that is inserted into the hole of the second substrate as a metal material;
    A first substrate having the same structure and size as the second substrate and coupled to cover the U-shaped portion inserted into the second substrate;
    And a metal cover having the same structure and size as those of the first and second substrates and having a threaded hole formed at the center thereof so as to be coupled to an upper portion of the first substrate and to move the metal rod up and down by a fixing nut Features a ceramic resonator with high frequency filter.
  2. And a second substrate having a hole with a diameter equal to that of the through hole is connected to the upper portion of the ceramic resonator, and the second substrate is connected to the upper portion of the ceramic resonator, wherein the through hole is formed in the center of the hexahedron, The U-shaped portion of the metal is inserted into the hole of the substrate, and then the first substrate is coupled to cover the U-shaped portion,
    A plurality of resonators are mounted on a metal housing divided into rectangular sections,
    A cover made of a metal material is formed which has holes having threaded portions corresponding to the through holes of the resonators,
    Wherein the first resonator and the last resonator of the resonator are connected to the input / output contactor, respectively.
  3. The method according to any one of claims 1 to 3,
    And the second substrate and the resonator are connected by soldering.
  4. The method according to any one of claims 1 to 3,
    And the U-shaped portion is coupled between the first and second substrates, and is electrically connected to the conductive coating in the through-hole of the resonator.
KR20130103097A 2013-08-29 2013-08-29 Ceramic Resonator and Filter using thereof KR20150028372A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108535852A (en) * 2018-04-18 2018-09-14 电子科技大学 A kind of resonator and preparation method thereof
CN111370816A (en) * 2019-12-23 2020-07-03 瑞声科技(新加坡)有限公司 Ceramic dielectric filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108535852A (en) * 2018-04-18 2018-09-14 电子科技大学 A kind of resonator and preparation method thereof
CN111370816A (en) * 2019-12-23 2020-07-03 瑞声科技(新加坡)有限公司 Ceramic dielectric filter

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