WO2021182668A1 - Filtre à cavité haute fréquence et dispositif de communication le comprenant - Google Patents

Filtre à cavité haute fréquence et dispositif de communication le comprenant Download PDF

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Publication number
WO2021182668A1
WO2021182668A1 PCT/KR2020/004712 KR2020004712W WO2021182668A1 WO 2021182668 A1 WO2021182668 A1 WO 2021182668A1 KR 2020004712 W KR2020004712 W KR 2020004712W WO 2021182668 A1 WO2021182668 A1 WO 2021182668A1
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WO
WIPO (PCT)
Prior art keywords
resonator
filter body
filter
frequency cavity
cavity filter
Prior art date
Application number
PCT/KR2020/004712
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English (en)
Korean (ko)
Inventor
여선구
Original Assignee
주식회사 엘트로닉스
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Publication of WO2021182668A1 publication Critical patent/WO2021182668A1/fr

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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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
    • 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

Definitions

  • An embodiment of the present invention relates to a high frequency cavity filter.
  • a high-frequency filter is used in most transmission/reception communication equipment such as a mobile communication base station or a repeater.
  • a cavity filter having a cavity structure is mainly used for devices requiring high power, such as a mobile communication base station.
  • a cavity filter is a filter in which a plurality of cavities are formed inside the filter, a resonator is installed in the cavity, and filtering is performed through resonance in each cavity.
  • Conventional high-frequency cavity filters have problems in that they are difficult to assemble due to many parts, consume a lot of manufacturing cost and manufacturing time, and are not suitable for mass production due to many tuning points.
  • An embodiment of the present invention is to provide a high-frequency cavity filter having a novel structure and a communication device including the same.
  • a high frequency cavity filter is a high frequency cavity filter including a filter body made of a conductive material and one or more resonators provided in the filter body, wherein the filter body is a base forming an upper surface of the filter body plate; a first side plate provided downward from one side of the base plate; a second side plate provided downward from the other side of the base plate; a front plate connected to one end of the first side plate and one end of the second side plate, respectively, at the front end of the base plate; a rear plate connected to the other end of the first side plate and the second side plate at the rear end of the base plate, respectively; and a resonator hole provided at a position corresponding to the resonator of the base plate and provided through the base plate, wherein the resonator is provided to protrude downward from an edge of the resonator hole.
  • the resonator may have an empty inside, and the inside of the resonator may be provided in communication with the outside through the resonator hole.
  • the high-frequency cavity filter may include: a tuning part provided at an end of the resonator to be spaced apart from an inner wall of the resonator; and a plurality of tuning connection units provided to connect the inner wall of the resonator to the tuning unit.
  • the tuning part may have a diameter smaller than the inner diameter of the resonator, and may be provided such that a gap is formed between the inner walls of the resonator at a portion except for a point connected by the tuning connection part.
  • the high-frequency cavity filter may include a cover part made of a conductive material, coupled to the filter body at a lower portion of the filter body, and provided to cover an open lower surface of the filter body; and a frequency control unit coupled to an end of the resonator and provided to face the cover unit.
  • the resonator may include a frequency adjusting coupling unit provided at an end of the resonator and coupled to the frequency adjusting unit, wherein the frequency adjusting unit includes: a frequency adjusting body having an insertion hole provided in the center and facing the cover; And it protrudes from the edge of the insertion hole toward the resonator, may include a fitting coupling portion is fitted to the outside of the frequency control coupling portion.
  • the high frequency cavity filter may include: an edge portion provided along a lower edge of the filter body; a plurality of press protrusions provided on the surface of the edge portion; a cover part made of a conductive material, coupled to the filter body at a lower portion of the filter body, and provided to cover an open lower surface of the filter body; and a plurality of first coupling holes provided along the edge of the cover part and configured to perform a pressing process by inserting the plurality of press protrusions.
  • the high frequency cavity filter may include: a partition wall provided in the filter body along a width direction of the filter body and provided between the resonators; a coupling protrusion extending and protruding from an end of the partition wall; and a second coupling hole provided on the cover part and into which the coupling protrusion is inserted and coupled.
  • the high-frequency cavity filter may include a cover part made of a conductive material, coupled to the filter body at a lower portion of the filter body, and provided to cover an open lower surface of the filter body; an input terminal unit protruding downward from one side of the filter body; an output terminal unit protruding downward from the other side inside the filter body; a first terminal insertion hole provided in the cover portion and exposed to the outside through which the input terminal portion is inserted; and a second terminal insertion hole provided in the cover portion and exposed to the outside through which the output terminal portion is inserted.
  • the input terminal part and the output terminal part are provided to protrude lower than the lower end of the filter body, and the diameter of the first terminal insertion hole and the second terminal insertion hole is greater than the diameter of the input terminal part and the output terminal part, respectively. It may be provided to be large and spaced apart from the input terminal part and the output terminal part, respectively.
  • the high frequency cavity filter may further include a substrate provided under the cover part and including a first connection part electrically connected to the input terminal part and a second connection part electrically connected to the output terminal part.
  • the filter body and the cover part are combined through a pressing process, assembly between parts of the high-frequency cavity filter is simple, and the number of parts is reduced, thereby reducing manufacturing cost and manufacturing effort.
  • the tuning unit is provided at the end of each resonator, the number of resonators and the number of tuning units are the same, thereby reducing the time required for tuning.
  • the inside of the resonator is empty and the tuning is performed by pressing the tuning part through the tuning screw, the appearance of the resonator, such as scratches, is not affected.
  • FIG. 1 is an exploded perspective view of a high-frequency cavity filter according to an embodiment of the present invention
  • FIG. 2 is a combined perspective view of a high-frequency cavity filter according to an embodiment of the present invention.
  • FIG. 3 is a view showing the inside of the filter body in the high-frequency cavity filter according to an embodiment of the present invention.
  • FIG. 4 is a view showing a state in which the filter body and the cover part are coupled in the high-frequency cavity filter according to an embodiment of the present invention
  • FIG. 5 is a view illustrating a state in which a frequency adjuster is coupled to a resonator in a high-frequency cavity filter according to an embodiment of the present invention
  • FIG. 6 is a perspective view illustrating a resonator of a high-frequency cavity filter according to an embodiment of the present invention
  • FIG. 7 is a view showing a method of tuning a resonator through a tuning unit in a high-frequency cavity filter according to an embodiment of the present invention
  • FIG. 8 is a graph showing an S parameter of a high-frequency cavity filter according to an embodiment of the present invention.
  • FIG. 9 is a graph showing an spurious wave of a high-frequency cavity filter according to an embodiment of the present invention.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The above terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.
  • FIG. 1 is an exploded perspective view of a high-frequency cavity filter according to an embodiment of the present invention
  • FIG. 2 is a combined perspective view of a high-frequency cavity filter according to an embodiment of the present invention
  • FIG. 3 is a high-frequency cavity filter according to an embodiment of the present invention. It is a view showing the inside of the filter body in the cavity filter
  • FIG. 4 is a view showing a state in which the filter body and the cover part are combined in the high frequency cavity filter according to an embodiment of the present invention.
  • the high frequency cavity filter 100 may include a filter body 102 , a resonator 104 , a cover part 106 , and a substrate 108 .
  • the filter body 102 may be formed to form a cavity space therein.
  • the filter body 102 may have a rectangular parallelepiped shape with an open lower surface, but the shape is not limited thereto.
  • the filter body 102 may be made of a conductive material.
  • the filter body 102 may include a base plate 102a, a first side plate 102b, a second side plate 102c, a front plate 102d, and a back plate 102e.
  • the base plate 102a may be a portion forming the upper surface of the high frequency cavity filter 100 .
  • the base plate 102a may be formed in a rectangular plane having a predetermined length and width, but the shape is not limited thereto.
  • the first side plate 102b may be provided downward from one side of the base plate 102a.
  • the first side plate 102b may be provided along one edge of the base plate 102a.
  • the second side plate 102c may be provided downward from the other side of the base plate 102a.
  • the second side plate 102c may be provided along the other edge of the base plate 102a.
  • the second side plate 102c may be provided to face the first side plate 102b.
  • the front plate 102d may be provided downward from the front end of the base plate 102a.
  • the front plate 102d may be provided along the front edge of the base plate 102a.
  • the front plate 102d may be connected to one end of the first side plate 102b and the second side plate 102c, respectively.
  • the rear plate 102e may be provided downward from the rear end of the base plate 102a.
  • the rear plate 102e may be provided along the rear edge of the base plate 102a.
  • the rear plate 102e may be connected to the other ends of the first side plate 102b and the second side plate 102c, respectively.
  • the rear plate 102e may be provided to face the front plate 102d.
  • an edge portion 111 may be provided at a lower end of the filter body 102 along the edge of the filter body 102 . That is, the edge portion 111 may be provided along the lower ends of the first side plate 102b, the second side plate 102c, the front plate 102d, and the rear plate 102e. The edge portion 111 may be provided to be thicker than the thickness of the filter body 102 .
  • a plurality of press protrusions 111a may be provided on one surface of the edge portion 111 (ie, the surface facing the cover portion 106 ).
  • a plurality of press protrusions 111a may be provided to be spaced apart from each other along the edge portion 111 .
  • one or more partition walls 113 may be provided inside the filter body 102 .
  • the partition wall 113 may be provided between the resonator 104 and the resonator 104 inside the filter body 102 .
  • One end of the partition wall 113 may be connected to the first side plate 102b, and the other end of the partition wall 113 may be connected to the second side plate 102c. That is, the partition wall 113 may be provided in the filter body 102 along the width direction of the filter body 102 .
  • the partition wall 113 may be provided integrally with the filter body 102 .
  • the partition wall 113 may control electrical coupling between the resonator 104 and the resonator 104 .
  • a window 113a may be provided in the partition wall 113 to adjust the electrical coupling between the resonator 104 and the resonator 104 .
  • the window 113a may be provided by partially cutting the partition wall 113 .
  • the frequency bandwidth of the resonator 104 can be adjusted by adjusting the electrical coupling between the resonator 104 and the resonator 104 according to the size of the window 113a. For example, as the size of the window 113a increases, the frequency bandwidth of the resonator 104 becomes wider, and as the size of the window 113a decreases, the frequency bandwidth of the resonator 104 becomes narrower.
  • the partition wall 113 may be provided with a coupling protrusion 115 that protrudes from an end of the partition wall 113 .
  • the coupling protrusion 115 may serve to couple the filter body 102 and the cover part 106 .
  • an input terminal part 131 and an output terminal part 133 may be provided inside the filter body 102 , respectively.
  • the input terminal unit 131 may be provided on one side of the inside of the filter body 102 .
  • the input terminal part 131 may be provided to protrude downward from the base plate 102a.
  • the input terminal unit 131 may be provided to protrude lower than the lower end of the filter body 102 .
  • a signal received by an antenna of a communication system may be input to the input terminal unit 131 .
  • the output terminal part 133 may be provided on the other side of the inside of the filter body 102 .
  • the output terminal part 133 may be provided to protrude downward from the base plate 102a.
  • the output terminal part 133 may be provided to protrude lower than the lower end of the filter body 102 .
  • a signal filtered through the high-frequency cavity filter 100 may be output to the output terminal unit 133 .
  • a plurality of resonators 104 may be provided in the filter body 102 to be spaced apart from each other. When a plurality of resonators 104 are formed, each resonator 104 may be provided to be spaced apart from each other at regular intervals. The number of resonators 104 may be set to an appropriate number according to the performance of a communication system using the high frequency cavity filter 100 and frequency selectivity required in the communication system.
  • the resonator 104 may be provided integrally with the filter body 102 .
  • a resonator hole 117 may be provided in the base plate 102a at a position corresponding to the resonator 104 .
  • the resonator 104 may be provided to protrude downward from the edge of the resonator hole 117 of the base plate 102a. That is, the resonator 104 may be provided downward from the filter body 102 .
  • the resonator 104 may have a cylindrical shape, but the shape is not limited thereto.
  • the inside of the resonator 104 may be provided in an empty form. Accordingly, the inside of the resonator 104 may be provided in communication with the outside through the resonator hole 117 .
  • a tuning part 119 may be provided at an end of the resonator 104 .
  • the tuning unit 119 may be provided to tune the resonant frequency of the resonator 104 .
  • a frequency adjusting unit 121 may be coupled to the resonator 104 .
  • 5 is a view showing a state in which the frequency adjusting unit 121 is coupled to the resonator 104 in the high frequency cavity filter according to an embodiment of the present invention.
  • a frequency control coupling unit 104a to which the frequency control unit 121 is inserted and coupled may be provided at an end of the resonator 104 .
  • the frequency control coupling portion 104a may have an outer diameter smaller than the outer diameter of the resonator 104 body.
  • the inner diameter of the frequency control coupling portion 104a may be provided to be the same as the inner diameter of the main body of the resonator 104 . Accordingly, a step may be formed at the boundary between the resonator 104 body and the frequency control coupling unit 104a.
  • the frequency adjusting unit 121 may be coupled to an end of the resonator 104 .
  • the frequency control unit 121 may be provided to face the cover unit 106 in a state coupled to the end of the resonator 104 .
  • the frequency adjusting unit 121 may serve to adjust the resonant frequency of the resonator 104 to be lowered as the capacitance value is increased by increasing the area facing the cover unit 106 . Therefore, the overall size (height) of the high-frequency cavity filter 100 can be reduced.
  • the capacitance value is greater than the inductance value of the resonator 104 due to the frequency adjusting unit 121 , so that the spurious wave characteristic is improved.
  • the frequency adjusting unit 121 may include a frequency adjusting body 121a and a fitting coupling unit 121b.
  • the frequency control body 121a may be provided to face the cover part 106 .
  • the frequency control body 121a may be formed of a circular plate, but the shape is not limited thereto and may be formed in various other shapes (eg, a square, etc.).
  • An insertion hole 121a-1 may be provided in the frequency control body 121a.
  • the insertion hole 121a-1 may be provided in the center of the frequency control body 121a.
  • the engaging portion 121b may be provided to protrude from the edge of the insertion hole 121a-1 toward the resonator 104.
  • the fitting coupling portion 121b may be coupled to the outside of the frequency control coupling portion 104a.
  • the inner diameter of the fitting coupling portion 121b may be provided to be smaller than the outer diameter of the frequency control coupling portion 104a. Accordingly, by pressing the frequency control unit 121, the fitting coupling portion 121b may be coupled to the outside of the frequency control coupling portion 104a.
  • the cover part 106 may be provided under the filter body 102 .
  • the cover part 106 may be coupled to the filter body 102 at the lower part of the filter body 102 . As the cover part 106 is coupled to the filter body 102 , a cavity is formed in the filter body 102 and the cover part 106 .
  • the cover part 106 may be made of a conductive material.
  • the cover part 106 may be provided to cover the open lower surface of the filter body 102 .
  • the cover part 106 may be formed in the form of a plate.
  • a plurality of first coupling holes 106a may be provided on the edge of the cover part 106 .
  • a plurality of first coupling holes 106a may be provided to be spaced apart from each other along the edge of the cover part 106 .
  • the first coupling hole 106a may be provided to correspond to the press protrusion 111a.
  • the cover part 106 may be coupled to the filter body 102 through a press. Specifically, in a state in which the cover part 106 is positioned below the filter body 102 so that the first coupling holes 106a of the cover part 106 correspond to the press protrusions 111a of the filter body 102, respectively. When the cover part 106 is pushed up toward the filter body 102 , the press protrusion 111a is inserted into the first coupling hole 106a to protrude from the opposite surface of the cover part 106 . At this time, when the pressing process is performed, the protruding press protrusion 111a is pressed against the opposite surface of the cover part 106 to form a firm coupling between the cover part 106 and the filter body 102 .
  • a second coupling hole 106b may be provided in the cover part 106 .
  • the second coupling hole 106b may be provided to correspond to the coupling protrusion 115 of the partition wall 113 .
  • the coupling between the cover part 106 and the filter body 102 is achieved while the coupling protrusion 115 is fitted into the second coupling hole 106b.
  • a first terminal insertion hole 106c and a second terminal insertion hole 106d may be provided in the cover part 106 , respectively.
  • the input terminal part 131 may be inserted into the first terminal insertion hole 106c and exposed downward.
  • the output terminal part 133 may be inserted into the second terminal insertion hole 106d and exposed downward.
  • the diameters of the first terminal insertion hole 106c and the second terminal insertion hole 106d may be larger than the diameters of the input terminal part 131 and the output terminal part 133 , respectively. Therefore, the input terminal part 131 and the output terminal part 133 are respectively inserted into the first terminal insertion hole 106c and the second terminal insertion hole 106d in the first terminal insertion hole 106c and the second terminal insertion hole 106d state. It may be spaced apart from the insertion hole 106d, respectively.
  • the substrate 108 may be provided under the cover part 106 .
  • a first connection part 108a electrically connected to the input terminal part 131 and a second connection part 108b electrically connected to the output terminal part 133 may be provided on the board 108 , respectively.
  • the high-frequency cavity filter 100 may further include a notch filter unit 123 .
  • the notch filter unit 123 may be provided to remove a frequency band adjacent to the used frequency band of the high frequency cavity filter 100 . That is, in order to prevent the signal of the high frequency cavity filter 100 from interfering with the signal of the adjacent frequency band, the notch filter unit 123 uses the frequency band of the high frequency cavity filter 100 in the signal of the high frequency cavity filter 100 . It can serve to remove the frequency band adjacent to .
  • the notch filter unit 123 may be mounted inside the filter body 102 .
  • FIG. 6 is a perspective view illustrating a resonator of a high frequency cavity filter according to an embodiment of the present invention
  • FIG. 7 is a view showing a method of tuning the resonator through a tuning unit in the high frequency cavity filter according to an embodiment of the present invention.
  • FIG. 7A is a diagram illustrating a state before tuning
  • FIG. 7B is a diagram illustrating a state after tuning.
  • a tuning unit 119 may be provided at an end of the resonator 104 .
  • the tuning part 119 may be provided at an end of the resonator 104 to be spaced apart from the inner wall of the resonator 104 . That is, the tuning unit 119 may have a smaller diameter than the inner diameter of the resonator 104 .
  • the tuning unit 119 may be connected to the resonator 104 through the tuning connection unit 141 .
  • a plurality of tuning connection units 141 may be provided to be spaced apart from each other.
  • the tuning connection units 141 may be provided at intervals of 120 degrees to connect the tuning units 119 with the inner wall of the resonator 104 , but is not limited thereto.
  • the tuning part 119 is connected to the inner wall of the resonator 104 through the tuning connection part 141 at three points, and a gap is formed between the inner wall of the resonator 104 and the other part.
  • the tuning screw 50 when the tuning screw 50 is inserted through the resonator hole 117 and the tuning part 119 is pressed, the tuning part 119 is stretched downward due to the toughness of the metal. Accordingly, the distance between the tuning part 119 and the cover part 106 is narrowed, so that the capacitance value of the resonator 104 can be adjusted.
  • the tuning unit 119 is provided at the end of each resonator 104, the number of resonators 104 and the number of tuning units 119 are the same, thereby reducing the time required for tuning.
  • the tuning part corresponding to about twice the number of resonators so it takes a lot of time for tuning. time can be reduced.
  • the inside of the resonator 104 is empty and the tuning is performed by pressing the tuning part 119 through the tuning screw 50, the appearance of the resonator 104 is not affected such as scratches. Further, there is a gap between the resonator 104 and the tuning unit 119, so that condensation due to moisture is eliminated.
  • FIG. 8 is a graph illustrating an S parameter of a high-frequency cavity filter according to an embodiment of the present invention. .
  • the frequency band used for the high-frequency cavity filter 100 is 3.6 to 3.7 GHz.
  • the high frequency cavity filter 100 exhibits notch characteristics in bands adjacent to the 3.6 GHz and 3.7 GHz bands, which are used frequency bands. This is a result of making the notch characteristic appear near the frequency band used by the high frequency cavity filter 100 by the notch filter unit 123 . Through this, the high frequency cavity filter 100 can prevent interference with signals of adjacent frequency bands from occurring.
  • FIG 9 is a graph illustrating an spurious wave of a high-frequency cavity filter according to an embodiment of the present invention.
  • the high-frequency cavity filter 100 exhibits spurious waves at 4.8 times or more of the center frequency (ie, 3.6 GHz). That is, in general, the spurious wave is generated at twice the center frequency, but in the disclosed embodiment, the capacitance is greater than the inductance of the resonator 104 due to the frequency adjusting unit 121, so that the center frequency (ie, 3.6 GHz) is 4.8 times or more. spurious wave appears, and thus the spurious wave characteristic is improved.
  • the center frequency ie, 3.6 GHz

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

L'invention concerne un filtre à cavité haute fréquence et un dispositif de communication le comprenant. Un filtre à cavité haute fréquence selon un mode de réalisation décrit comprend : un corps de filtre comprenant un matériau conducteur ; et un ou plusieurs résonateurs disposés à l'intérieur du corps de filtre, le corps de filtre comprenant : une plaque de base formant la surface supérieure du corps de filtre ; une première plaque latérale disposée vers le bas à partir d'un côté de la plaque de base ; une seconde plaque latérale disposée vers le bas à partir de l'autre côté de la plaque de base ; une plaque avant reliée à une extrémité de chacune des première et seconde plaques latérales au niveau de l'extrémité avant de la plaque de base ; une plaque arrière reliée à l'autre extrémité de chacune des première et seconde plaques latérales au niveau de l'extrémité arrière de la plaque de base ; et un trou de résonateur qui est disposé au niveau de la position de la plaque de base, correspondant à celui du résonateur, et qui est disposé dans la plaque de base, et le résonateur est prévu pour faire saillie vers le bas à partir du bord du trou de résonateur.
PCT/KR2020/004712 2020-03-11 2020-04-08 Filtre à cavité haute fréquence et dispositif de communication le comprenant WO2021182668A1 (fr)

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KR10-2020-0030169 2020-03-11
KR1020200030169A KR102211323B1 (ko) 2020-03-11 2020-03-11 고주파 캐비티 필터 및 이를 포함하는 통신 기기

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050174749A1 (en) * 2002-06-28 2005-08-11 Telefonaktiebolaget Lm Ericsson (Publ) Integrated filter construction
US20050219013A1 (en) * 2004-04-06 2005-10-06 Pavan Kumar Comb-line filter
CN101924262A (zh) * 2009-06-11 2010-12-22 深圳市大富科技股份有限公司 一种腔体滤波器
KR101386941B1 (ko) * 2012-10-10 2014-04-18 주식회사 이너트론 조립식 대역 저지 필터
KR101728152B1 (ko) * 2016-09-21 2017-04-19 (주)웨이브텍 캐비티형 무선 주파수 필터 및 그것의 제조방법

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090036327A (ko) 2007-10-09 2009-04-14 주식회사 이롬테크 고주파 필터

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050174749A1 (en) * 2002-06-28 2005-08-11 Telefonaktiebolaget Lm Ericsson (Publ) Integrated filter construction
US20050219013A1 (en) * 2004-04-06 2005-10-06 Pavan Kumar Comb-line filter
CN101924262A (zh) * 2009-06-11 2010-12-22 深圳市大富科技股份有限公司 一种腔体滤波器
KR101386941B1 (ko) * 2012-10-10 2014-04-18 주식회사 이너트론 조립식 대역 저지 필터
KR101728152B1 (ko) * 2016-09-21 2017-04-19 (주)웨이브텍 캐비티형 무선 주파수 필터 및 그것의 제조방법

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KR102211323B1 (ko) 2021-02-03

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