WO2023282372A1 - Filtre passe-haut coaxial et dispositif de communication le comprenant - Google Patents

Filtre passe-haut coaxial et dispositif de communication le comprenant Download PDF

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Publication number
WO2023282372A1
WO2023282372A1 PCT/KR2021/008789 KR2021008789W WO2023282372A1 WO 2023282372 A1 WO2023282372 A1 WO 2023282372A1 KR 2021008789 W KR2021008789 W KR 2021008789W WO 2023282372 A1 WO2023282372 A1 WO 2023282372A1
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WO
WIPO (PCT)
Prior art keywords
filter body
resonant
pair
filter
coaxial high
Prior art date
Application number
PCT/KR2021/008789
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English (en)
Korean (ko)
Inventor
여선구
정화영
Original Assignee
주식회사 엘트로닉스
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Publication date
Application filed by 주식회사 엘트로닉스 filed Critical 주식회사 엘트로닉스
Priority to PCT/KR2021/008789 priority Critical patent/WO2023282372A1/fr
Publication of WO2023282372A1 publication Critical patent/WO2023282372A1/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
    • H01P1/207—Hollow waveguide filters
    • 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

  • An embodiment of the present invention relates to a coaxial high frequency filter.
  • a coaxial high frequency filter is installed between an antenna and a transceiver in a communication system or a radar system to pass signals within a frequency band used and attenuate signals in other frequency bands.
  • the coaxial high frequency filter has a structure that causes resonance inside, and through resonance, only signals of a used frequency band can pass.
  • each part of the conventional coaxial high frequency filter is individually separated, tolerances of each part are accumulated during assembly of each part, and thus the characteristics of the coaxial high frequency filter may appear different from those at the time of design. In addition, there is a problem in that it takes a lot of time to assemble each part.
  • An embodiment of the present invention is to provide a coaxial high frequency filter that improves assembly convenience and minimizes change in characteristics, and a communication device having the same.
  • An embodiment of the present invention is to provide a coaxial high frequency filter capable of easily performing tuning and a communication device having the same.
  • a coaxial high frequency filter includes a filter body; a pair of first resonators inserted into both ends of the filter body within the filter body; and a second resonator provided between the pair of first resonators in the filter body and spaced apart from the pair of first resonators to generate a coupling with the pair of first resonators.
  • the pair of first resonators may include a first resonant rod provided along the longitudinal direction of the filter body; a first resonance plate having one surface connected to an end of the first resonance rod and provided perpendicular to the first resonance rod; a second resonance rod having one end connected to the other surface of the first resonance plate and provided along the longitudinal direction of the filter body; and a second resonance plate connected to the other end of the second resonance rod and provided perpendicularly to the second resonance rod.
  • the first resonance rod and the second resonance rod are each provided along a central axis of the longitudinal direction of the filter body, and the first resonance plate and the second resonance plate each have a smaller diameter than the inner diameter of the filter body. It may be provided and spaced apart from the inner surface of the filter body.
  • the second resonance rod has a diameter smaller than that of the first resonance rod and a length smaller than the length of the first resonance rod, and the second resonance plate has a thickness greater than that of the first resonance plate. It may be provided with a thick thickness.
  • the second resonator may include a third resonant rod; a third resonance plate connected to one end of the third resonance rod and provided perpendicular to the third resonance rod; and a fourth resonance plate connected to the other end of the third resonance rod and provided perpendicular to the third resonance rod.
  • the third resonant rod has the same central axis as the central axes of the first and second resonant rods in the longitudinal direction, and the third resonant plate and the fourth resonant plate are the pair of first resonators. It is provided to face the second resonant plate, respectively, and may be provided with a diameter corresponding to the second resonant plate.
  • the coaxial high frequency filter may include a pair of first dielectrics provided surrounding the first resonant rod and having a diameter corresponding to an inner diameter of the filter body; a pair of second dielectrics provided surrounding the second resonant rod and having a diameter corresponding to an inner diameter of the filter body; and a third dielectric body surrounding the third resonant rod and having a diameter corresponding to an inner diameter of the filter body.
  • the third dielectric is provided to tune a resonant frequency band of the coaxial high frequency filter, and includes a through hole into which the third resonant rod is inserted; and a tuning slit provided across the third dielectric from the through hole to an outer circumferential surface of the third dielectric, wherein both ends of the third dielectric facing each other with the tuning slit interposed therebetween are cut to form the resonant frequency band. It can be arranged to tune.
  • the coaxial high frequency filter is provided in a spaced apart space between the pair of first resonators and the second resonators and maintains a coupling value between the pair of first resonators and the second resonators.
  • a pair of fourth A dielectric may further be included.
  • the filter body may include at least one assembly slit provided at both ends of the filter body and provided along a longitudinal direction of the filter body.
  • the coaxial high frequency filter may include a waterproof member mounting portion provided along a circumference of the filter body; And it may further include a waterproof member mounted to the waterproof member mounting portion.
  • the waterproof member mounting portion may include a first mounting protrusion provided adjacent to one end of the filter body and protruding along the circumference of the filter body; a second mounting protrusion provided adjacent to the other end of the filter body and protruding along the circumference of the filter body; and a third mounting protrusion spaced apart from the first mounting protrusion and the second mounting protrusion, respectively, between the first mounting protrusion and the second mounting protrusion and protruding along the circumference of the filter body.
  • the first mounting protrusion is provided to increase in thickness from one end of the filter body to the other end, and the second mounting protrusion is provided to have the same thickness as the maximum thickness of the first mounting protrusion.
  • the 3 mounting protrusions may have the same thickness as the minimum thickness of the first mounting protrusion.
  • each component of the pair of first resonator and second resonator by integrally forming each component of the pair of first resonator and second resonator, it is possible to minimize the change in characteristics of the coaxial high frequency filter by reducing the tolerance between the components, and assembling the coaxial high frequency filter. Convenience can be improved. And, since the assembly of the coaxial high frequency filter is assembled by pushing the internal components into the filter body, the manufacturing time can be shortened and it is suitable for mass production.
  • the user can easily tune to a desired frequency band, thereby optimizing the performance of the coaxial high frequency filter.
  • tuning since tuning is used, material costs can be reduced, and production yield can be improved due to a low defect rate.
  • FIG. 1 is a perspective view showing a coaxial high frequency filter according to an embodiment of the present invention
  • FIG. 2 is a perspective view showing a state in which a waterproofing member is detached from a coaxial high frequency filter according to an embodiment of the present invention
  • FIG. 3 is a view showing a state in which internal parts are inserted into a filter body in a coaxial high frequency filter according to an embodiment of the present invention
  • FIG. 4 is an exploded perspective view of a coaxial high frequency filter according to an embodiment of the present invention.
  • FIG. 5 is a cross-sectional view showing a coaxial high frequency filter according to an embodiment of the present invention
  • FIG. 6 is a diagram showing an equivalent circuit of a coaxial high frequency filter according to an embodiment of the present invention.
  • FIG. 7 is a cross-sectional view showing a third dielectric as a tuning dielectric in a coaxial high frequency filter according to an embodiment of the present invention.
  • FIG. 8 is a graph showing S parameters after tuning and tuning in a coaxial high frequency filter according to an embodiment of the present invention.
  • directional terms such as upper side, lower side, one side, and the other side are used in relation to the orientation of the disclosed drawings. Since components of embodiments of the present invention may be positioned in a variety of orientations, directional terms are used for purposes of illustration and not limitation.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.
  • FIG. 1 is a perspective view showing a coaxial high frequency filter according to an embodiment of the present invention
  • FIG. 2 is a perspective view showing a state in which a waterproofing member is detached from the coaxial high frequency filter according to an embodiment of the present invention
  • FIG. 3 is a perspective view of the present invention. is a view showing a state in which internal parts are inserted into the filter body in a coaxial high frequency filter according to an embodiment of the present invention
  • FIG. 4 is an exploded perspective view of the coaxial high frequency filter according to an embodiment of the present invention
  • the coaxial high frequency filter 100 includes a filter body 102, a pair of first resonators 104, a second resonator 106, a pair of first dielectrics 108, a pair of first resonators 104, A pair of second dielectrics 110 , a third dielectric 112 , a pair of fourth dielectrics 114 , and a waterproof member 116 may be included.
  • the filter body 102 may configure the exterior of the coaxial high frequency filter 100 .
  • the filter body 102 may serve to protect internal parts of the coaxial high frequency filter 100 from the external environment.
  • the filter body 102 may be provided in a hollow shape with an empty inside.
  • the filter body 102 may serve as a ground for the coaxial high frequency filter 100 .
  • the filter body 102 may be made of a conductive material.
  • the coaxial high frequency filter 100 may be used by being connected to a coaxial connector or a coaxial cable.
  • Assembly slits 102a may be provided at both ends of the filter body 102 .
  • Assembly slits 102a may be provided at both ends of the filter body 102 in the longitudinal direction of the filter body 102 .
  • a plurality of assembly slits 102a may be provided at predetermined angular intervals.
  • the assembly slits 102a may be provided along the outer circumferential surface of the filter body 102 at intervals such as 60 degrees or 90 degrees, but are not limited thereto.
  • a pair of first resonators 104, a second resonator 106, and a pair of first dielectrics are formed inside the filter body 102.
  • a pair of second dielectrics 110, a pair of third dielectrics 112, and a pair of coupling parts 114 can be easily inserted and extracted.
  • the filter body 102 may be provided with a waterproof member mounting portion 102b.
  • the waterproof member mounting portion 102b may be provided along the circumference of the filter body 102 .
  • a waterproof member 116 may be mounted on the waterproof member mounting portion 102b.
  • the waterproof member mounting portion 102b allows the waterproof member 116 to be closely attached and prevents the waterproof member 116 from falling out of the filter body 102, thereby effectively preventing moisture.
  • the waterproof member 116 may be made of a material having elasticity and insulating properties such as rubber or urethane.
  • the waterproof member mounting portion 102b may include a first mounting protrusion 102b-1, a second mounting protrusion 102b-2, and a third mounting protrusion 102b-3.
  • the first mounting protrusion 102b-1 may protrude along the circumference of the filter body 102 near one end of the filter body 102.
  • the first mounting protrusion 102b-1 may be provided such that its diameter increases from one end of the filter body 102 to the other end. That is, the thickness of the first mounting protrusion 102b-1 may increase from one end to the other end of the filter body 102.
  • the second mounting protrusion 102b-2 may protrude along the circumference of the filter body 102 near the other end of the filter body 102.
  • the second mounting protrusion 102b-2 may have the same thickness as the maximum thickness of the first mounting protrusion 102b-1.
  • the second mounting protrusion 102b-2 may be provided to be spaced apart from the first mounting protrusion 102b-1.
  • the third mounting protrusion 102b-3 is formed between the first mounting protrusion 102b-1 and the second mounting protrusion 102b-2 between the first mounting protrusion 102b-1 and the second mounting protrusion 102b-2. and may be provided separately from each other.
  • the third mounting protrusion 102b-3 may protrude along the circumference of the filter body 102 between the first mounting protrusion 102b-1 and the second mounting protrusion 102b-2.
  • the third mounting protrusion 102b-3 may have the same thickness as the minimum thickness of the first mounting protrusion 102b-1.
  • the waterproof member 116 may be mounted in a space between the first mounting protrusion 102b-1 and the second mounting protrusion 102b-2.
  • the space between the first mounting protrusion 102b-1 and the second mounting protrusion 102b-2 is the end of the first mounting protrusion 102b-1, the third mounting protrusion 102b-3, and the second mounting protrusion 102b-3.
  • the contact area with the waterproof member 116 is widened to improve adhesion, and prevents the waterproof member 116 from falling out of the filter body 102. be able to prevent
  • a pair of first resonators 104 may be provided inside the filter body 102 .
  • a pair of first resonators 104 may be provided at one end and the other end, respectively, inside the filter body 102 .
  • the pair of first resonators 104 may be provided symmetrically left and right with respect to the center of the filter body 102 . As the pair of first resonators 104 are provided symmetrically, loss occurring in the coaxial high frequency filter 100 can be reduced.
  • the pair of first resonators 104 may include a first resonance rod 104a, a first resonance plate 104b, a second resonance rod 104c, and a second resonance plate 104d.
  • the first resonant rod 104a may be provided in the longitudinal direction of the filter body 102 .
  • the first resonant rod 104a may be provided along a central axis of the filter body 102 in the longitudinal direction.
  • the first resonant rod 104a may have a smaller diameter than the inner diameter of the filter body 102 .
  • a feed pin insertion hole 104a-1 into which a feed pin (not shown) is inserted may be provided at one end of the first resonant rod 104a.
  • the feed pin insertion hole 104a-1 may be provided along the longitudinal direction of the first resonant rod 104a.
  • the power supply pin (not shown) may be a power supply pin of a coaxial connector.
  • the first resonance plate 104b may be provided at an end of the first resonance rod 104a.
  • the first resonance plate 104b may be provided perpendicularly to the first resonance rod 104a at an end of the first resonance rod 104a.
  • the first resonance plate 104b may have a smaller diameter than the inner diameter of the filter body 102 .
  • the first resonance rod 104a may be connected to one surface of the first resonance plate 104b.
  • the second resonance rod 104c may be connected to the other surface of the first resonance plate 104b.
  • the second resonance rod 104c may be provided along the central axis of the longitudinal direction of the filter body 102 on the other surface of the first resonance plate 104b.
  • a central axis of the second resonance rod 104c in the longitudinal direction may be the same as a central axis of the first resonance rod 104a in the longitudinal direction.
  • the second resonant rod 104c may have a diameter smaller than that of the first resonant rod 104a.
  • the second resonant rod 104c may be provided with a length smaller than that of the first resonant rod 104a.
  • the second resonance plate 104d may be provided at an end of the second resonance rod 104c.
  • the second resonant plate 104d may be provided perpendicularly to the second resonant rod 104c at an end of the second resonant rod 104c.
  • the second resonance plate 104d may have a smaller diameter than the inner diameter of the filter body 102 . That is, the first resonance plate 104b and the second resonance plate 104d may be provided to be spaced apart from the inner surface of the filter body 102 .
  • the second resonance plate 104d may be provided with a thickness greater than that of the first resonance plate 104b.
  • each component of the pair of first resonators 104 may be integrally provided.
  • each component of the pair of first resonators 104 may be integrally provided through precision processing, but the method of integrally forming the pair of first resonators 104 is not limited thereto. not.
  • each component of the pair of first resonators 104 is integrally formed, it is possible to minimize the tolerance between the components, thereby minimizing the change in the characteristics of the coaxial high frequency filter 100 due to assembly. Assembly convenience of the high frequency filter 100 can be improved.
  • the second resonator 106 may be provided between the pair of first resonators 104 in the filter body 102 .
  • the second resonator 106 may be spaced apart from the pair of first resonators 104 between the pair of first resonators 104 .
  • the second resonator 106 may include a third resonance plate 106a, a third resonance rod 106b, and a fourth resonance plate 106c.
  • each component of the second resonator 106 may be integrally provided through precision machining.
  • the third resonance plate 106a may be provided at one end of the third resonance rod 106b.
  • the third resonant plate 106a may be provided facing any one of the pair of first resonators 104 .
  • the third resonance plate 106a may have a diameter corresponding to that of the second resonance plate 104d.
  • the fourth resonance plate 106c may be provided at the other end of the third resonance rod 106b.
  • the fourth resonator plate 106c may be provided facing the other one of the pair of first resonators 104 .
  • the fourth resonance plate 106c may have a diameter corresponding to that of the second resonance plate 104d.
  • the third resonance rod 106b may be provided between the third resonance plate 106a and the fourth resonance plate 106c to connect the third resonance plate 106a and the fourth resonance plate 106c.
  • the third resonance rod 106b may be provided along a central axis of the filter body 102 in the longitudinal direction.
  • a central axis of the third resonance rod 106b in the longitudinal direction may be the same as a central axis of the first resonance rod 104a in the longitudinal direction.
  • the third resonance rod 106b may have a diameter corresponding to that of the second resonance rod 104c.
  • a pair of first dielectrics 108 may be provided on an outer surface of the first resonant rod 104a.
  • a pair of first dielectrics 108 may be provided to surround the first resonant rod 104a.
  • a through hole through which the first resonant rod 104a is inserted may be provided in the pair of first dielectric bodies 108 along a central axis in the longitudinal direction.
  • the pair of first dielectrics 108 may be provided with a diameter corresponding to the inner diameter of the filter body 102 .
  • the pair of first dielectrics 108 may serve to fix the first resonant rod 104a within the filter body 102 .
  • a pair of second dielectrics 110 may be provided on an outer surface of the second resonant rod 104c. That is, the pair of second dielectrics 110 may be provided between the first resonance plate 104b and the second resonance plate 104d to surround the second resonance rod 104c. A through hole through which the second resonant rod 104c is inserted may be provided in the pair of second dielectrics 110 along the central axis in the longitudinal direction. The pair of second dielectrics 110 may be provided with a diameter corresponding to the inner diameter of the filter body 102 .
  • the pair of first dielectrics 108 and the pair of second dielectrics 110 are provided with a diameter corresponding to the inner diameter of the filter body 102, the pair of first resonators 104 and the filter body ( 102) so that insulation can be maintained between them.
  • the pair of second dielectrics 110 may serve to fix the second resonant rod 104c within the filter body 102 and may serve to perform impedance matching in the pair of first resonators 104. there is.
  • the third dielectric 112 may be provided on an outer surface of the third resonant rod 106b. That is, the third dielectric 112 may be provided between the third resonance plate 106a and the fourth resonance plate 106c to surround the third resonance rod 106b.
  • the third dielectric 112 may be provided with a through hole through which the third resonant rod 106b is inserted along the central axis in the longitudinal direction.
  • the third dielectric 112 may have a diameter corresponding to the inner diameter of the filter body 102 . Accordingly, insulation between the second resonator 106 and the filter body 102 can be maintained.
  • the third dielectric 112 may serve to fix the third resonance rod 106b within the filter body 102 .
  • the third dielectric 112 may serve to tune a resonant frequency band of the coaxial high frequency filter 100 .
  • a pair of fourth dielectrics 114 may be provided between the pair of first resonators 104 and second resonators 106 .
  • a pair of fourth dielectrics 114 may be inserted into spaced apart spaces between the pair of first resonators 104 and second resonators 106 .
  • the pair of fourth dielectrics 114 may serve to maintain a coupling value between the pair of first resonators 104 and second resonators 106 .
  • a pair of fourth dielectrics 114 are closely attached to both sides of the second resonator 106. Since the pair of first resonators 104 provided with the pair of first dielectrics 108 and the pair of second dielectrics 110 need only be inserted into both ends of the inside of the filter body 102, Assembly of the coaxial high frequency filter 100 is easy and assembly time can be shortened.
  • FIG. 6 is a diagram showing an equivalent circuit of a coaxial high frequency filter according to an embodiment of the present invention.
  • the first resonant rod 104a, the second resonant rod 104c, and the third resonant rod 106b become inductance components L1, L2, and L3 in the coaxial high frequency filter 100
  • the first resonance plate 104b, the second resonance plate 104d, the third resonance plate 106a, and the fourth resonance plate 106c have capacitance components (C1, C2, C3, C4) in the coaxial high frequency filter 100.
  • the distance between the pair of first resonators 104 and second resonators 106 may be a capacitance component (Cg) in the coaxial high frequency filter 100 .
  • the coaxial high frequency filter 100 is implemented as a band pass filter that passes only a preset frequency band.
  • the coaxial high frequency filter 100 may be provided to generate resonance in a frequency band of the X band (9 to 10 GHz), but is not limited thereto.
  • FIG. 7 is a cross-sectional view showing a third dielectric as a tuning dielectric in a coaxial high frequency filter according to an embodiment of the present invention.
  • FIG. 7(a) is a diagram showing a state before tuning
  • FIG. 7(b) is a diagram showing a state after tuning.
  • a through hole 112a into which the third resonant rod 106b is inserted may be provided at the center of the third dielectric 112 .
  • a tuning slit 112b may be provided in the third dielectric 112 from the through hole 112a to the outer circumferential surface of the third dielectric 112 .
  • the tuning slit 112b may be provided across the third dielectric body 112 from the through hole 112a such that one end communicates with the through hole 112a and the other end communicates with the outside of the third dielectric body 112. there is.
  • the tuning slit 112b may be provided with a preset width.
  • tuning may be performed by partially cutting both ends of the third dielectric material 112 facing each other with the tuning slit 112b interposed therebetween. Due to this, the resonant frequency of the coaxial high frequency filter 100 can be moved to a desired frequency band.
  • FIG. 8 is a graph showing S parameters before tuning (FIG. 8(a)) and after tuning (FIG. 8(b)) in a coaxial high frequency filter according to an embodiment of the present invention.
  • the resonant frequency band moves to a higher frequency band than before tuning. can see things In addition, it can be seen that the S parameter after tuning is more improved than before tuning.

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Abstract

La présente invention concerne un filtre passe-haut coaxial et un dispositif de communication le comprenant. Un filtre passe-haut coaxial, selon un mode de réalisation décrit, comprend : un corps de filtre ; une paire de premiers résonateurs insérés dans les deux parties d'extrémité du corps de filtre dans le corps de filtre ; et un second résonateur qui est disposé entre la paire de premiers résonateurs dans le corps de filtre, et qui est espacé de chaque résonateur de la paire de premiers résonateurs de manière à générer un couplage avec la paire de premiers résonateurs.
PCT/KR2021/008789 2021-07-09 2021-07-09 Filtre passe-haut coaxial et dispositif de communication le comprenant WO2023282372A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/KR2021/008789 WO2023282372A1 (fr) 2021-07-09 2021-07-09 Filtre passe-haut coaxial et dispositif de communication le comprenant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2021/008789 WO2023282372A1 (fr) 2021-07-09 2021-07-09 Filtre passe-haut coaxial et dispositif de communication le comprenant

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WO2023282372A1 true WO2023282372A1 (fr) 2023-01-12

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100899102B1 (ko) * 2008-11-19 2009-05-27 에프투텔레콤 주식회사 다이플렉서 및 다이플렉서를 구비한 다중 대역 주파수 공용기
KR101295180B1 (ko) * 2012-05-31 2013-08-09 주식회사 이너트론 하모닉 제거용 가변 공진기를 구비하는 저역 통과 필터 및 이 저역 통과 필터를 구비하는 다중 대역 통과 필터
KR20160096458A (ko) * 2015-02-05 2016-08-16 김규용 멀티플렉서 및 멀티플렉서용 저역통과필터
KR20170047890A (ko) * 2015-10-26 2017-05-08 엘에스전선 주식회사 동축 케이블용 동축 커넥터
KR101974546B1 (ko) * 2019-01-18 2019-05-02 한화시스템 주식회사 필터 내장형 캐비티 백 안테나
KR102285497B1 (ko) * 2020-05-14 2021-08-03 주식회사 엘트로닉스 동축 고주파 필터 및 이를 구비하는 통신 기기

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100899102B1 (ko) * 2008-11-19 2009-05-27 에프투텔레콤 주식회사 다이플렉서 및 다이플렉서를 구비한 다중 대역 주파수 공용기
KR101295180B1 (ko) * 2012-05-31 2013-08-09 주식회사 이너트론 하모닉 제거용 가변 공진기를 구비하는 저역 통과 필터 및 이 저역 통과 필터를 구비하는 다중 대역 통과 필터
KR20160096458A (ko) * 2015-02-05 2016-08-16 김규용 멀티플렉서 및 멀티플렉서용 저역통과필터
KR20170047890A (ko) * 2015-10-26 2017-05-08 엘에스전선 주식회사 동축 케이블용 동축 커넥터
KR101974546B1 (ko) * 2019-01-18 2019-05-02 한화시스템 주식회사 필터 내장형 캐비티 백 안테나
KR102285497B1 (ko) * 2020-05-14 2021-08-03 주식회사 엘트로닉스 동축 고주파 필터 및 이를 구비하는 통신 기기

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