WO2022003960A1 - Dispositif haute fréquence - Google Patents

Dispositif haute fréquence Download PDF

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Publication number
WO2022003960A1
WO2022003960A1 PCT/JP2020/026228 JP2020026228W WO2022003960A1 WO 2022003960 A1 WO2022003960 A1 WO 2022003960A1 JP 2020026228 W JP2020026228 W JP 2020026228W WO 2022003960 A1 WO2022003960 A1 WO 2022003960A1
Authority
WO
WIPO (PCT)
Prior art keywords
protrusion
metal plate
rubber sheet
frequency device
metal
Prior art date
Application number
PCT/JP2020/026228
Other languages
English (en)
Japanese (ja)
Inventor
隆二 稲垣
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2022533001A priority Critical patent/JP7350178B2/ja
Priority to PCT/JP2020/026228 priority patent/WO2022003960A1/fr
Publication of WO2022003960A1 publication Critical patent/WO2022003960A1/fr

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Classifications

    • 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
    • H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies

Definitions

  • This disclosure relates to a high frequency device in which high frequency components are mounted inside.
  • Patent Document 1 includes a box-shaped metal housing having an opening on one side, a metal plate covering the opening of the metal housing, and a high-frequency device provided with a protrusion provided by cutting a part of the metal plate.
  • the protrusion protrudes toward the inside of the metal housing.
  • the protrusion is a quarter wavelength resonator in which one end is short-circuited and the other end is open, and operates as a band suppression filter that suppresses radio waves in a desired frequency band. This makes it possible to improve the isolation characteristics of a desired frequency band inside the metal housing.
  • the isolation characteristic deteriorates due to the spatial resonance generated inside the metal housing in an unnecessary frequency band.
  • the “desired frequency band” is the wavelength band of the signal processed by the high frequency device.
  • the “unnecessary frequency band” is a frequency band other than the desired frequency band, that is, a wavelength band other than the wavelength band of the signal processed by the high frequency device.
  • the present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a high-frequency device capable of improving isolation characteristics even in an unnecessary frequency band.
  • the high-frequency device has a metal housing having a gap portion in which at least one surface is open, and a metal housing in which a high-frequency component is mounted in the gap portion, and a metal housing. It is provided with a metal plate that covers the opening of the metal plate and a radio wave absorber attached to the surface of the metal plate facing the gap portion of the metal housing.
  • the metal plate has protrusions that project toward the inside of the metal housing.
  • the high frequency device according to the present disclosure has the effect of being able to improve the isolation characteristics even in an unnecessary frequency band.
  • Sectional drawing which shows the high frequency apparatus which concerns on Embodiment 1.
  • Plan view showing a metal plate and a rubber sheet after cutting Graph showing the electromagnetic field analysis results of Examples and Comparative Examples
  • FIG. 1 is a cross-sectional view showing a high frequency device 1 according to the first embodiment.
  • the high frequency device 1 includes a metal housing 2, a metal plate 3, a metal lid 4, and a rubber sheet 5.
  • the arrow Y in FIG. 1 indicates the propagation direction of the radio wave.
  • the metal housing 2 is formed in a box shape with one side open.
  • the metal housing 2 has a bottom wall portion 21 and four side wall portions 22. Note that FIG. 1 illustrates only three side wall portions 22 out of the four side wall portions 22.
  • the bottom wall portion 21 is formed in a rectangular shape in a plan view.
  • the side wall portion 22 rises from the peripheral edge of the bottom wall portion 21 and is formed in a rectangular frame shape in a plan view.
  • a plurality of derivative substrates 6 are mounted inside the metal housing 2. Each of the plurality of derivative substrates 6 is installed on the bottom wall portion 21 at intervals in the propagation direction Y.
  • a high frequency device 7 is mounted on each of the derivative substrates 6. The high frequency device 7 is installed between two adjacent derivative substrates 6 or on the derivative substrate 6.
  • the high frequency device 7 is a high frequency component that processes high frequencies in the microwave and millimeter wave bands.
  • the high frequency device 7 is, for example, an amplifier, a phase detector, a multiplier, a balun, a mixer, an attenuator, and a high frequency connector.
  • the metal plate 3 is a member that covers the opening of the metal housing 2.
  • the metal plate 3 is formed in a rectangular shape in a plan view.
  • the metal plate 3 is placed on each of the plurality of side wall portions 22.
  • the metal plate 3 is fixed to the side wall portion 22 by a screw or the like (not shown).
  • Inside the metal housing 2 a space 23, which is a gap portion surrounded by the bottom wall portion 21, the side wall portion 22, and the metal plate 3, is formed.
  • the metal plate 3 has a plurality of protrusions 31 that project toward the inside of the metal housing 2.
  • the protrusion 31 is formed by cutting and bending a part of the metal plate 3. The details of the protrusion 31 will be described later.
  • the rubber sheet 5 is a radio wave absorber attached to the surface of the metal plate 3 facing the inside of the metal housing 2.
  • the rubber sheet 5 plays a role of absorbing radio waves in an unnecessary frequency band.
  • the rubber sheet 5 is formed in a rectangular shape in a plan view.
  • the rubber sheet 5 is arranged inside the side wall portion 22, that is, in the space 23. In the present embodiment, the rubber sheet 5 is arranged with a gap from the side wall portion 22, but may be arranged in a state of being in contact with the side wall portion 22.
  • a part of the rubber sheet 5 is attached to a part of the surface of the protrusion 31. In the present embodiment, a part of the rubber sheet 5 is attached to the surface of the protrusion 31 on the front side of the paper surface in FIG.
  • the metal lid 4 is a member installed on the metal plate 3.
  • the metal lid 4 is fixed to the side wall portion 22 together with the metal plate 3 by a screw or the like (not shown).
  • FIG. 2 is a plan view showing the metal plate 3 and the rubber sheet 5 before cutting.
  • FIG. 3 is a plan view showing the metal plate 3 and the rubber sheet 5 after cutting.
  • the shape of the protrusion 31 is not particularly limited, but is L-shaped in the present embodiment.
  • the protrusion 31 extends linearly from the metal plate 3 toward the bottom wall portion 21, and then extends linearly in parallel with the bottom wall portion 21.
  • the protrusion 31 is a quarter wavelength resonator in which one end is short-circuited and the other end is open.
  • the protrusion 31 operates as a band suppression filter by itself.
  • the distance D from the bent position 33, which is the base end of the protrusion 31, to the tip 34 of the protrusion 31, that is, the distance D from the short-circuited end to the open end of the protrusion 31, is 4 minutes of the wavelength of the radio wave of the frequency to be suppressed.
  • the distance D from the bent position 33 of the protrusion 31 to the tip 34 of the protrusion 31 is a length corresponding to a quarter wavelength at the frequency to be suppressed.
  • the length corresponding to the quarter wavelength at the frequency to be suppressed includes the length corresponding to the wavelength completely matching the quarter wavelength at the frequency to be suppressed, as well as the suppression target. It also includes a length corresponding to a wavelength slightly deviated from a quarter wavelength at the frequency of.
  • a rubber sheet 5 is attached to a part of the surface of the protrusion 31. Although not shown, the rubber sheet 5 is not attached to the rest of the surface of the protrusion 31, and the metal surface is exposed. As shown in FIG.
  • the plurality of protrusions 31 are formed so as to be spaced apart from each other in the longitudinal direction and the lateral direction of the metal plate 3.
  • the number of the protrusions 31 is not particularly limited, but in the present embodiment, there are a total of 18 protrusions (6 rows in the longitudinal direction of the metal plate 3 ⁇ 3 rows in the lateral direction of the metal plate 3).
  • the manufacturing method of the high frequency device 1 includes a pasting step, a cutting step, a bending step, and a mounting step.
  • the sticking step is a step of sticking the rubber sheet 5 to the metal plate 3 before cutting.
  • the rubber sheet 5 is attached to the metal plate 3 by, for example, an adhesive.
  • the lengthwise dimension of the rubber sheet 5 is smaller than the lengthwise dimension of the metal plate 3.
  • the dimension of the rubber sheet 5 in the lateral direction is smaller than the dimension of the metal plate 3 in the lateral direction.
  • the cutting step is a step of cutting the metal plate 3 and the rubber sheet 5 along the contour of the protrusion 31 positioned on the metal plate 3 and the rubber sheet 5 to form a notch 32.
  • the metal plate 3 and the rubber sheet 5 are cut so that a part of the contour of the protrusion 31 represented by the broken line in FIG. 3 remains and the shape of the protrusion 31 is L-shaped. A part of the contour of the protrusion 31 that remains without being cut becomes the bending position 33 when the protrusion 31 is bent.
  • the bending step is a step of bending the inner portion of the notch 32 with a part of the contour of the protrusion 31 as the bending position 33. Since the rubber sheet 5 attached to the metal plate 3 is elastically deformable, a part of the rubber sheet 5 can be easily bent together with the part of the metal plate 3. As shown in FIG. 1, a protrusion 31 to which the rubber sheet 5 is attached is formed by the bending step.
  • the bending angle of the protrusion 31 at the bending position 33 is 90 degrees in the example shown in FIG. 1, but it may be other than 90 degrees.
  • a hole (not shown) is formed in the portion of the metal plate 3 in which the protrusion 31 is cut and bent.
  • the protrusion 31 which is the inner portion of the bent notch 32, enters the inside of the metal housing 2 on which the high-frequency component is mounted, and the metal housing 2 is mounted.
  • the metal lid 4 is mounted on the metal housing 2 so as to cover a hole (not shown) of the metal plate 3.
  • the metal plate 3 and the metal lid 4 are fixed to the side wall portion 22 of the metal housing 2 with screws, adhesives, etc. (not shown).
  • the metal plate 3 has a protrusion 31 protruding toward the inside of the metal housing 2.
  • the protrusion 31 operates as a band suppression filter by itself, it is possible to improve the isolation characteristics of a desired frequency band inside the metal housing 2.
  • the distance D from the bent position 33 of the protrusion 31 to the tip 34 of the protrusion 31 is a length corresponding to one-fourth of the wavelength of the radio wave of the frequency to be suppressed, so that the metal housing 2 has a length D. It is possible to further improve the isolation characteristics of a desired frequency band internally.
  • the high-frequency device 1 is attached to a surface of the metal plate 3 facing the inside of the metal housing 2, and the rubber sheet 5 absorbs radio waves in an unnecessary frequency band.
  • the rubber sheet 5 absorbs radio waves in an unnecessary frequency band.
  • a rubber sheet 5 is attached to a part of the surface of the protrusion 31, so that radio waves in an unnecessary frequency band are further absorbed. , Resonance generated inside the metal housing 2 can be further suppressed. Therefore, the isolation characteristic of an unnecessary frequency band can be further improved.
  • a protrusion 31 to be a resonator can be formed by cutting and bending a metal plate 3 to which a rubber sheet 5 that absorbs radio waves in an unnecessary frequency band is attached in advance. The cost can be reduced.
  • the protrusion 31 serving as a resonator can be formed by cutting and bending the metal plate 3, the size and shape of the protrusion 31 can be easily adjusted.
  • the metal plate 3 to which the rubber sheet 5 is attached can be cut by etching or laser, cutting by die cutting, or the like. Therefore, the metal plate 3 having the protrusion 31 is manufactured. The cost can be kept low.
  • the rubber sheet 5 is attached to the surface of the metal plate 3 facing the inside of the metal housing 2 and the surface of the protrusion 31, but at least the metal housing 2 of the metal plate 3 has a rubber sheet 5.
  • the rubber sheet 5 may be attached to the surface facing the inside. In such a configuration, after the protrusion 31 is provided on the metal plate 3, the rubber sheet 5 may be attached to the surface of the metal plate 3 facing the inside of the metal housing 2.
  • the rubber sheet 5 is attached to a part of the surface of the protrusion 31, that is, the surface of the surface of the protrusion 31 on the front side of the paper surface in FIG. 1, but the entire surface of the protrusion 31 is attached.
  • the rubber sheet 5 may be attached to the surface other than the surface on the front side of the paper surface in FIG. 1 on the surface of the protrusion 31. In such a configuration, after the protrusion 31 is provided on the metal plate 3, the rubber sheet 5 may be attached to the surface of the protrusion 31.
  • the radio wave absorbing material is the rubber sheet 5
  • the radio wave absorbing material may be a magnetic radio wave absorbing material, a dielectric radio wave absorbing material, or the like.
  • the magnetic radio wave absorber is, for example, ferrite.
  • the dielectric radio wave absorber is, for example, carbon.
  • the metal lid 4 is provided, but the metal lid 4 may be omitted.
  • the shape of the protrusion 31 is L-shaped is illustrated, but the shape of the protrusion 31 may be a quadrangle, a T-shape, or the like. Further, the protrusions 31 having different shapes may be formed on the metal plate 3.
  • the configuration shown in the above embodiment is an example, and can be combined with another known technique, or a part of the configuration may be omitted or changed without departing from the gist. It is possible.
  • FIG. 4 is a graph showing the electromagnetic field analysis results of Examples and Comparative Examples.
  • the horizontal axis of FIG. 4 indicates the frequency of radio waves.
  • the vertical axis of FIG. 4 shows the amount of radio waves passing through.
  • the desired frequency band and the unnecessary frequency band are not limited to the numerical range illustrated in FIG.
  • An embodiment is a high frequency device 1 provided with the rubber sheet 5 shown in FIG.
  • a comparative example is a high-frequency device in which the rubber sheet 5 is omitted from the high-frequency device 1 shown in FIG.
  • the high-frequency device is used as a waveguide, and the electromagnetic field analysis of the high-frequency device is performed by the finite element method.
  • the amount of radio waves passing through the inside of the metal housing 2 is measured along the propagation direction Y shown in FIG.
  • the amount of passage is the amount of binding through the space 23, and the smaller the amount of passage, the higher the isolation effect.
  • 1 high frequency device 2 metal housing, 3 metal plate, 4 metal lid, 5 rubber sheet, 6 derivative substrate, 7 high frequency device, 21 bottom wall, 22 side wall, 23 space, 31 protrusion, 32 notch, 33 bending Position, 34 tip.

Abstract

L'invention concerne un dispositif haute fréquence (1) comprenant : un boîtier métallique (2) qui a une partie de cavité dont au moins un côté est ouvert et dans lequel un composant à haute fréquence est contenu ; une plaque métallique (3) qui recouvre l'ouverture du boîtier métallique (2) ; et un matériau d'absorption d'ondes radio qui est fixé sur le côté de la plaque métallique (3) qui fait face à la partie de cavité du boîtier métallique (2). La plaque métallique (3) présente des parties saillantes (31) qui font saillie vers l'intérieur du boîtier métallique (2). La distance (D) de l'extrémité de base de chaque partie saillante (31) à l'extrémité avant (34) de celle-ci est égale à une longueur équivalente à une quart de longueur d'onde à des fréquences devant être supprimées.
PCT/JP2020/026228 2020-07-03 2020-07-03 Dispositif haute fréquence WO2022003960A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022533001A JP7350178B2 (ja) 2020-07-03 2020-07-03 高周波装置
PCT/JP2020/026228 WO2022003960A1 (fr) 2020-07-03 2020-07-03 Dispositif haute fréquence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/026228 WO2022003960A1 (fr) 2020-07-03 2020-07-03 Dispositif haute fréquence

Publications (1)

Publication Number Publication Date
WO2022003960A1 true WO2022003960A1 (fr) 2022-01-06

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Application Number Title Priority Date Filing Date
PCT/JP2020/026228 WO2022003960A1 (fr) 2020-07-03 2020-07-03 Dispositif haute fréquence

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JP (1) JP7350178B2 (fr)
WO (1) WO2022003960A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004138415A (ja) * 2002-10-16 2004-05-13 Hitachi Ltd レーダ装置
US20100224399A1 (en) * 2007-04-17 2010-09-09 Nano Interface Technology Electromagnetic wave shielding heat-radiation sheet and manufactured method thereof
WO2012128127A1 (fr) * 2011-03-23 2012-09-27 古河電気工業株式会社 Dispositif de télécommunication haute fréquence
JP6184610B2 (ja) * 2014-10-29 2017-08-23 三菱電機株式会社 高周波装置及び高周波装置の製造方法
WO2019175933A1 (fr) * 2018-03-12 2019-09-19 三菱電機株式会社 Dispositif à haute fréquence

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4262507B2 (ja) 2003-04-24 2009-05-13 株式会社リコー 電界結合素子の設置方法
JP4056500B2 (ja) 2004-06-28 2008-03-05 三菱電機株式会社 伝送線路基板および半導体パッケージ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004138415A (ja) * 2002-10-16 2004-05-13 Hitachi Ltd レーダ装置
US20100224399A1 (en) * 2007-04-17 2010-09-09 Nano Interface Technology Electromagnetic wave shielding heat-radiation sheet and manufactured method thereof
WO2012128127A1 (fr) * 2011-03-23 2012-09-27 古河電気工業株式会社 Dispositif de télécommunication haute fréquence
JP6184610B2 (ja) * 2014-10-29 2017-08-23 三菱電機株式会社 高周波装置及び高周波装置の製造方法
WO2019175933A1 (fr) * 2018-03-12 2019-09-19 三菱電機株式会社 Dispositif à haute fréquence

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JP7350178B2 (ja) 2023-09-25
JPWO2022003960A1 (fr) 2022-01-06

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