WO2022234748A1 - アンテナ素子、電子機器及びアンテナ素子の製造方法 - Google Patents

アンテナ素子、電子機器及びアンテナ素子の製造方法 Download PDF

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Publication number
WO2022234748A1
WO2022234748A1 PCT/JP2022/015284 JP2022015284W WO2022234748A1 WO 2022234748 A1 WO2022234748 A1 WO 2022234748A1 JP 2022015284 W JP2022015284 W JP 2022015284W WO 2022234748 A1 WO2022234748 A1 WO 2022234748A1
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WO
WIPO (PCT)
Prior art keywords
insulating base
antenna element
conductor layer
dielectric constant
antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/015284
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English (en)
French (fr)
Japanese (ja)
Inventor
伸郎 池本
恒亮 西尾
薫 須藤
敬一 市川
信之 天野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2023518641A priority Critical patent/JP7420315B2/ja
Priority to CN202290000382.6U priority patent/CN220856913U/zh
Publication of WO2022234748A1 publication Critical patent/WO2022234748A1/ja
Priority to US18/381,671 priority patent/US12438261B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits

Definitions

  • the present invention relates to an antenna element provided with an antenna conductor layer.
  • the microstrip antenna described in Patent Document 1 As an invention related to conventional antenna elements, for example, the microstrip antenna described in Patent Document 1 is known.
  • This microstrip antenna comprises a dielectric substrate, a rectangular conductor and a ground conductor.
  • the dielectric substrate has an upper major surface and a lower major surface.
  • a rectangular conductor is provided on the upper main surface of the dielectric substrate.
  • a ground conductor is provided on the lower main surface of the dielectric substrate.
  • the rectangular conductor overlaps the ground conductor when viewed in the vertical direction.
  • a rectangular conductor functions as an antenna.
  • an object of the present invention is to provide an antenna element having a structure with a high degree of freedom in designing the frequencies of high-frequency signals that can be transmitted and received by the antenna element.
  • An antenna element includes: An antenna element, an insulating base material having a first main surface and a second main surface arranged in the vertical direction; an antenna conductor layer provided on the first main surface of the insulating base; and At least one first opening having an annular outer edge when viewed in the vertical direction is provided in the antenna conductor layer, one or more first insulating base non-formation regions are positioned between the insulating base and the antenna conductor layer in the vertical direction, The insulating base does not exist in the one or more first insulating base non-formed regions, each of outer edges of the one or more first openings overlaps one or more of the first insulating base non-forming regions when viewed in the vertical direction and is not in contact with the insulating base;
  • the antenna element has the structure of (A) or (B), (A) the one or more first insulating base non-formed regions are first holes, (B) the one or more A low dielectric constant material having a dielectric constant lower than the dielectric constant of the insulating base
  • An antenna element includes: An antenna element, an insulating base material having a first main surface and a second main surface arranged in the vertical direction; an antenna conductor layer provided on the first main surface of the insulating base; a reference conductor layer provided on the second main surface of the insulating base; and The reference conductor layer overlaps the antenna conductor layer when viewed in the vertical direction, At least one second opening having an annular outer edge when viewed in the vertical direction is provided in the reference conductor layer, one or more second insulating base non-formation regions are positioned between the insulating base and the reference conductor layer in the vertical direction; The insulating base does not exist in the one or more second insulating base non-formation regions, each of outer edges of the one or more second openings overlaps one or more of the second insulating base non-formation regions when viewed in the vertical direction and is not in contact with the insulating base; (C) or (D), wherein (C) the one or more second insulating base non-formed regions are
  • a method for manufacturing an antenna element includes: An antenna conductor layer forming step of forming an antenna conductor layer provided with one or more first openings having an annular outer edge when viewed in the vertical direction, in the first insulator layer; a crimping step of forming an insulating base material by crimping a plurality of insulator layers including the first insulator layer; Etching the first insulator layer using the antenna conductor layer as a mask to form a first cavity forming one or more first holes each containing the one or more first openings when viewed in a vertical direction. a hole forming step; It has
  • a method for manufacturing an antenna element includes: a reference conductor layer forming step of forming, in a second insulator layer, a reference conductor layer provided with one or more second openings having an annular outer edge when viewed in the vertical direction; a crimping step of forming an insulating substrate by crimping a plurality of insulator layers including a first insulator layer provided with an antenna conductor layer and the second insulator layer; second holes forming one or more second holes each containing the one or more second openings when viewed in the vertical direction by etching the second insulator layer using the reference conductor layer as a mask; a hole forming step; It has
  • the antenna element, the electronic device, and the method of manufacturing the antenna element according to the present invention it is possible to obtain a structure with a high degree of freedom in designing the frequency of the high-frequency signal that can be transmitted and received by the antenna element.
  • FIG. 1 is an exploded perspective view of the antenna element 10.
  • FIG. FIG. 2 is a cross-sectional view along AA in FIG.
  • FIG. 3 is a flow chart showing the manufacturing process of the antenna element 10.
  • FIG. 4 is a cross-sectional view of the antenna element 10a.
  • FIG. 5 is a top view of the insulator layer 16a of the antenna element 10b.
  • FIG. 6 is a cross-sectional view of the antenna element 10b.
  • FIG. 7 is a cross-sectional view of the antenna element 10c.
  • FIG. 8 is a cross-sectional view of the antenna element 10d.
  • FIG. 9 is a cross-sectional view of the antenna element 10e.
  • FIG. 10 is a cross-sectional view of the antenna element 10f.
  • FIG. 11 is a top view of the insulator layer 16a and a bottom view of the insulator layer 16e of the antenna element 10g.
  • FIG. 12 is an exploded perspective view of the antenna element 10h. 13 is a rear view of the circuit board 200.
  • FIG. Each of FIG. 14 is a cross-sectional view of the hole Sp1a.
  • Each of FIG. 15 is a cross-sectional view of the air hole Sp1b.
  • Each of FIG. 16 is a cross-sectional view of the air hole Sp1c.
  • FIG. 17 is a cross-sectional view of the air hole Sp1d.
  • Each of FIG. 18 is a cross-sectional view of the hole Sp1e.
  • Each of FIG. 19 is a cross-sectional view of the air hole Sp1f.
  • FIG. 20 is a cross-sectional view of the hole Sp1g.
  • FIG. 1 is an exploded perspective view of the antenna element 10.
  • FIG. 1 is an exploded perspective view of the antenna element 10.
  • FIG. 2 is a cross-sectional view of the electronic device 1 including the antenna element 10. As shown in FIG. FIG. 2 is a cross-sectional view along AA in FIG. However, in FIG. 2, the housing 100 not shown in FIG. 1 is shown.
  • the vertical direction is defined as the direction in which the normal lines of the upper and lower main surfaces of the insulating base material 12 of the antenna element 10 extend.
  • the vertical direction coincides with the stacking direction of the insulating base material 12 .
  • the direction in which the long side of the antenna conductor layer 20 of the antenna element 10 extends is defined as the horizontal direction.
  • the direction in which the short side of the antenna conductor layer 20 of the antenna element 10 extends is defined as the front-rear direction.
  • the up-down direction is perpendicular to the front-rear direction.
  • the left-right direction is orthogonal to the up-down direction and the front-rear direction.
  • X is a part or member of the antenna element 10.
  • each part of X is defined as follows.
  • front of X is meant the front half of X.
  • Back of X means the back half of X.
  • the left part of X means the left half of X.
  • the right part of X means the right half of X.
  • Top of X means the top half of X.
  • the lower part of X means the lower half of X.
  • the leading edge of X means the leading edge of X.
  • the trailing end of X means the trailing end of X.
  • the left end of X means the end of X in the left direction.
  • the right end of X means the end of X in the right direction.
  • the upper end of X means the end of X in the upward direction.
  • the lower end of X means the lower end of X.
  • the front end of X means the front end of X and its vicinity.
  • the rear end of X means the rear end of X and its vicinity.
  • the left end of X means the left end of X and its vicinity.
  • the right end of X means the right end of X and its vicinity.
  • the upper end of X means the upper end of X and its vicinity.
  • the lower end of X means the lower end of X and its vicinity.
  • the antenna element 10 includes an insulating base material 12, an antenna conductor layer 20, reference conductor layers 22, 24 and 26, a signal conductor layer 28, a plurality of interlayer connection conductors v1 and interlayer connection conductors v2. there is
  • the insulating base material 12 has a plate shape. Therefore, the insulating base material 12 has an upper main surface (first main surface) and a lower main surface (second main surface) arranged in the vertical direction.
  • the upper main surface and the lower main surface of the insulating base material 12 have a rectangular shape with long sides extending in the left-right direction. Therefore, the length of the insulating base material 12 in the left-right direction is longer than the length of the insulating base material 12 in the front-rear direction.
  • the insulating base material 12 includes insulator layers 16a to 16e, as shown in FIG.
  • the insulating base material 12 has a structure in which insulating layers 16a to 16e are stacked vertically.
  • the insulator layers 16a-16e are arranged in this order from top to bottom.
  • the insulator layers 16a to 16e have the same rectangular shape as the insulating base material 12 when viewed in the vertical direction.
  • the insulator layers 16a-16e are flexible dielectric sheets.
  • the material of the insulating base material 12 is, for example, a thermoplastic resin.
  • Thermoplastic resins are, for example, thermoplastic resins such as liquid crystal polymer and PTFE (polytetrafluoroethylene).
  • the material of the insulating base material 12 may be polyimide.
  • the insulating base material 12 has flexibility. Therefore, the antenna element 10 may be used while being bent. “The antenna element 10 is bent” means that the antenna element 10 is deformed and bent by applying an external force to the antenna element 10 .
  • the deformation may be elastic deformation, plastic deformation, or both elastic deformation and plastic deformation.
  • the antenna conductor layer 20 is provided on the upper main surface (first main surface) of the insulating base material 12 .
  • the antenna conductor layer 20 is provided on the upper main surface of the insulator layer 16a.
  • the antenna conductor layer 20 has a rectangular shape with long sides extending in the horizontal direction when viewed in the vertical direction.
  • the antenna conductor layer 20 resonates on both the short side extending in the front-rear direction and the long side extending in the left-right direction. Therefore, the short side extending in the front-rear direction and the long side extending in the left-right direction of the antenna conductor layer 20 are about half the wavelength of the high-frequency signal transmitted and received by the antenna conductor layer 20 .
  • the length of the wavelength of the high-frequency signal transmitted and received by the antenna conductor layer 20 is the wavelength in consideration of the wavelength shortening effect due to the dielectric constant of the insulating base material 12 .
  • the antenna conductor layer 20 radiates high frequency signals as electromagnetic waves.
  • the antenna conductor layer 20 receives high-frequency signals of electromagnetic waves.
  • the signal conductor layer 28 is provided on the insulating base material 12 .
  • the signal conductor layer 28 is provided on the upper main surface of the insulator layer 16c.
  • the signal conductor layer 28 has a linear shape extending in the left-right direction. The right end portion of the signal conductor layer 28 overlaps the antenna conductor layer 20 when viewed in the vertical direction.
  • the signal conductor layer 28 transmits high frequency signals.
  • the interlayer connection conductor v2 electrically connects the antenna conductor layer 20 and the signal conductor layer . More specifically, the interlayer connection conductor v2 penetrates the insulator layers 16a and 16b in the vertical direction. An upper end of the interlayer connection conductor v2 is connected to the antenna conductor layer 20 . The position where the interlayer connection conductor v2 is connected in the antenna conductor layer 20 is a feeding point for high frequency signals. The lower end of the interlayer connection conductor v2 is connected to the right end of the signal conductor layer 28 .
  • the reference conductor layer 22 is provided on the lower main surface (second main surface) of the insulating base material 12 . Thereby, the reference conductor layer 22 is provided under the antenna conductor layer 20 . In this embodiment, the reference conductor layer 22 is provided on the lower main surface of the insulator layer 16e. The reference conductor layer 22 overlaps the antenna conductor layer 20 when viewed in the vertical direction.
  • the reference conductor layer 22 has a rectangular shape with long sides extending in the horizontal direction when viewed in the vertical direction.
  • the reference conductor layer 24 is provided on the insulating base material 12 .
  • the reference conductor layer 24 is provided on the upper main surface of the insulator layer 16a.
  • the reference conductor layer 24 has a rectangular frame shape when viewed in the vertical direction.
  • the reference conductor layer 24 surrounds the antenna conductor layer 20 when viewed in the vertical direction.
  • the antenna conductor layer 20 and the reference conductor layer 24 are separated from each other so that the antenna conductor layer 20 and the reference conductor layer 24 are not short-circuited.
  • the outer edge of the reference conductor layer 24 matches the outer edge of the reference conductor layer 22 when viewed in the vertical direction.
  • the reference conductor layer 26 is provided on the insulating base material 12 .
  • the reference conductor layer 26 is provided on the upper main surface of the insulator layer 16c.
  • the shape of the reference conductor layer 26 is substantially the same as that of the reference conductor layer 24 .
  • the reference conductor layer 26 and the signal conductor layer 28 are separated from each other so that the reference conductor layer 26 and the signal conductor layer 28 are not short-circuited.
  • a plurality of interlayer connection conductors v1 electrically connect the reference conductor layer 22, the reference conductor layer 24, and the reference conductor layer . More specifically, the plurality of interlayer connection conductors v1 vertically penetrate through the insulator layers 16a to 16e. Upper ends of the plurality of interlayer connection conductors v1 are connected to the reference conductor layer 24 . Middle portions of the plurality of interlayer connection conductors v1 are connected to the reference conductor layer 26 . Lower ends of the plurality of interlayer connection conductors v1 are connected to the reference conductor layer 22 .
  • the plurality of interlayer connection conductors v1 are arranged along the reference conductor layer 24 when viewed in the vertical direction. That is, the plurality of interlayer connection conductors v1 are arranged so as to surround the antenna conductor layer 20 when viewed in the vertical direction.
  • the antenna conductor layer 20, the reference conductor layers 22, 24, 26, and the signal conductor layer 28 as described above are formed by, for example, etching a metal foil provided on the upper or lower main surface of the insulator layers 16a to 16e. It is formed by being The metal foil is, for example, copper foil.
  • the interlayer connection conductors v1 and v2 are, for example, via-hole conductors.
  • the via-hole conductors are produced by forming through-holes in the insulating layers 16a to 16e, filling the through-holes with a conductive paste, and solidifying the conductive paste by heating.
  • the interlayer connection conductors v1 and v2 may be, for example, through-hole conductors. Through-hole conductors are produced by forming through-holes penetrating all or part of the insulator layers 16a to 16e and plating the through-holes.
  • a plurality of first openings Op1 are provided in the antenna conductor layer 20 .
  • the plurality of first openings Op1 are arranged in a matrix when viewed in the vertical direction.
  • the plurality of first openings Op1 has an annular outer edge E1 when viewed in the vertical direction.
  • the plurality of first openings Op1 have circular outer edges E1 when viewed in the vertical direction.
  • an annular shape is not limited to a circular ring, and includes a rectangular shape and a triangular shape. Therefore, the first opening Op1 does not include a notch.
  • a notch is an area surrounded by an outer edge that does not have an annular shape.
  • the outer edge of the notch is part of the outer edge of the antenna conductor layer 20 .
  • the antenna conductor layer 20 does not exist within the first opening Op1.
  • the interval between the plurality of adjacent first openings Op1 is, for example, 1/4 or less of the length of the wavelength of the high-frequency signal transmitted and received by the antenna conductor layer 20 .
  • the plurality of first insulating base non-formation regions A1 are formed by partially recessing the upper main surface of the insulating base 12 downward.
  • the plurality of first insulating base non-formation regions A1 are positioned between the insulating base 12 and the antenna conductor layer 20 in the vertical direction.
  • the insulating base material 12 does not exist in the plurality of first insulating base non-formed regions A1.
  • the plurality of first insulating base non-formation regions A1 are the first holes Sp1.
  • the plurality of first insulating base non-formation regions A1 are arranged in a matrix when viewed in the vertical direction so as to correspond to the plurality of first openings Op1.
  • the plurality of first insulating base non-formation regions A1 have annular outer edges when viewed in the vertical direction.
  • the plurality of first insulating base non-formation regions A1 have circular outer edges when viewed in the vertical direction.
  • Each of the plurality of first insulating base non-formation regions A1 includes each of the plurality of first openings Op1 when viewed in the vertical direction. That is, each of the plurality of first openings Op1 does not protrude from the plurality of first insulating base non-formation regions A1 when viewed in the vertical direction.
  • the diameter of the first insulating base non-formation region A1 is larger than the diameter of the first opening Op1.
  • the first insulating base non-formation region A1 has a hemispherical shape. Since the first insulating base non-formation region A1 has the structure described above, each of the outer edges E1 of the plurality of first openings Op1 overlaps the plurality of first insulating base non-formation regions A1 when viewed in the vertical direction. Therefore, it is not in contact with the insulating base material 12 . That is, under each of the outer edges E1 of the plurality of first openings Op1, the plurality of first insulating base non-formation regions A1 are positioned.
  • the plurality of second openings Op2, the plurality of second insulating base non-formation regions A2, and the plurality of second holes Sp2 will be described.
  • the plurality of second openings Op2, the plurality of second insulating base non-forming regions A2, and the plurality of second holes Sp2 are formed by the plurality of first openings Op1, the plurality of first insulating base non-forming regions A1, and the plurality of second openings Op2. It has a vertically symmetrical structure with one vacancy Sp1.
  • a plurality of second openings Op2 are provided in the reference conductor layer 22 .
  • the plurality of second openings Op2 are arranged in a matrix when viewed in the vertical direction.
  • the multiple second openings Op2 have an annular outer edge E2 when viewed in the vertical direction.
  • the plurality of second openings Op2 has a circular outer edge E2 when viewed in the vertical direction.
  • an annular shape is not limited to a circular ring, and includes a rectangular shape and a triangular shape.
  • the reference conductor layer 22 does not exist within the second opening Op2.
  • the plurality of second insulating base non-forming regions A2 are formed by partially recessing the lower main surface of the insulating base 12 upward.
  • the plurality of second insulating base non-formation regions A2 are located between the insulating base 12 and the reference conductor layer 22 in the vertical direction.
  • the insulating base material 12 does not exist in the plurality of second insulating base non-formation regions A2.
  • the plurality of second insulating base non-formation regions A2 are the second holes Sp2.
  • the plurality of second insulating base non-formation regions A2 are arranged in a matrix when viewed in the vertical direction so as to correspond to the plurality of second openings Op2.
  • the plurality of second insulating base non-formation regions A2 have annular outer edges when viewed in the vertical direction.
  • the plurality of second insulating base non-formation regions A2 have circular outer edges when viewed in the vertical direction.
  • Each of the plurality of second insulating base non-formation regions A2 includes each of the plurality of second openings Op2 when viewed in the vertical direction.
  • the second insulating base non-formation region A2 has a hemispherical shape.
  • each of the outer edges E2 of the plurality of second openings Op2 overlaps the plurality of second insulating base non-formation regions A2 when viewed in the vertical direction, It is not in contact with the insulating base material 12 . That is, under each of the outer edges E2 of the plurality of second openings Op2, the plurality of second insulating base non-formation regions A2 are positioned.
  • the electronic device 1 includes an antenna element 10 and a housing 100, as shown in FIG. Antenna element 10 is housed in housing 100 .
  • the electronic device 1 is, for example, a mobile wireless communication terminal such as a smart phone.
  • FIG. 3 is a flow chart showing the manufacturing process of the antenna element 10. As shown in FIG.
  • insulator layers 16a to 16c with metal foil attached to the upper main surface are prepared.
  • insulator layers 16d and 16e having metal foil attached to their lower main surfaces are prepared (step S1).
  • step S2 a mask is formed on the metal foil and an etching process is performed to form the antenna conductor layer 20, the reference conductor layers 22, 24 and 26, and the signal conductor layer 28 (step S2).
  • the antenna conductor layer 20 provided with a plurality of first openings Op1 having an annular outer edge when viewed in the vertical direction is formed on the insulator layer 16a (first insulator layer) (antenna conductor layer forming step).
  • the reference conductor layer 22 provided with a plurality of second openings Op2 having an annular outer edge when viewed in the vertical direction is formed in the insulator layer 16e (second insulator layer) (reference conductor layer formation). process).
  • a plurality of interlayer connection conductors v1 and interlayer connection conductors v2 are formed on the insulator layers 16a to 16e (step S3). Specifically, the insulator layers 16a to 16e are irradiated with a laser beam to form a plurality of through holes. After that, the plurality of through holes are filled with a conductive paste.
  • the insulating base material 12 is formed by crimping the insulator layers 16a to 16e (step S4, crimping step).
  • An antenna conductor layer 20 is provided on the insulator layer 16a (first insulator layer).
  • a reference conductor layer 22 is provided on the insulator layer 16e (second insulator layer).
  • the insulator layers 16a to 16e are heated while being pressed vertically. As a result, the insulator layers 16a to 16e are softened, and the insulator layers 16a to 16e are integrated.
  • the conductive paste is solidified by heating to form a plurality of interlayer connection conductors v1 and interlayer connection conductors v2.
  • a plurality of first holes Sp1 and a plurality of second holes Sp2 are respectively formed in the insulator layers 16a and 16e (step S5). Specifically, by etching the insulator layer 16a (first insulator layer) using the antenna conductor layer 20 as a mask, a plurality of first openings Op1 each including the plurality of first openings Op1 when viewed in the vertical direction are formed. A hole Sp1 is formed (first hole forming step). Furthermore, by etching the insulator layer 16e (second insulator layer) using the reference conductor layer 22 as a mask, a plurality of second holes Sp2 each including a plurality of second openings Op2 when viewed in the vertical direction are formed. are formed (second hole forming step). Through the above steps, the antenna element 10 is completed.
  • each of the outer edges E1 of the plurality of first openings Op1 overlaps the plurality of first insulating base non-formation regions A1 when viewed in the vertical direction and is not in contact with the insulating base 12 .
  • the plurality of first insulating base non-formation regions A1 are the first holes Sp1.
  • the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10 can be adjusted.
  • the antenna element 10 it is possible to obtain a structure with a high degree of freedom in designing the frequency of the high-frequency signal that the antenna element 10 can transmit and receive.
  • each of the outer edges E2 of the plurality of second openings Op2 overlaps the plurality of second insulating base non-formation regions A2 when viewed in the vertical direction and is not in contact with the insulating base 12 .
  • the plurality of second insulating base non-formation regions A2 are second holes Sp2. This reduces the dielectric constant between the antenna conductor layer 20 and the reference conductor layer 22 . Therefore, the wavelength of the high-frequency signal transmitted through the antenna conductor layer 20 becomes longer.
  • the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10 is lowered.
  • the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10 can be adjusted.
  • each of the plurality of first insulating base non-formation regions A1 is positioned between the insulating base 12 and the antenna conductor layer 20 in the vertical direction.
  • Each of the plurality of second insulating base non-formation regions A2 is positioned between the insulating base 12 and the reference conductor layer 22 in the vertical direction.
  • the plurality of first insulating base non-formation regions A1 and the plurality of second insulating base non-formation regions A2 are first holes Sp1 and second holes Sp2, respectively. This reduces the dielectric constant of the region between the antenna conductor layer 20 and the reference conductor layer 22 . Therefore, in order to form the designed capacitance between the antenna conductor layer 20 and the reference conductor layer 22, the distance between the antenna conductor layer 20 and the reference conductor layer 22 should be shortened. As a result, the thickness of the antenna element 10 can be reduced.
  • the antenna element 10 can be easily bent. More specifically, in the antenna element 10, the insulating base 12 is provided with a plurality of first holes Sp1 and a plurality of second holes Sp2. This makes it easier for the antenna element 10 to deform. In addition, since the thickness of the antenna element 10 can be reduced as described above, the antenna element 10 can be more easily deformed. As a result, according to the antenna element 10, the antenna element 10 can be easily bent.
  • the radiation efficiency of the antenna element 10 can be improved. More specifically, as described above, since the dielectric constant near the antenna conductor layer 20 becomes smaller, the wavelength of the high-frequency signal transmitted through the antenna conductor layer 20 becomes longer. Therefore, the size of the antenna conductor layer 20 may be increased in order to resonate the high-frequency signal in the antenna conductor layer 20 . When the antenna conductor layer 20 is enlarged, the radiation efficiency of the antenna element 10 is improved.
  • the interval between the plurality of adjacent first openings Op1 is 1/4 of the wavelength of the high-frequency signal transmitted and received by the antenna conductor layer 20. FIG. Thereby, it is possible to suppress the resonance between the holes in the frequency band of the high-frequency signal transmitted and received by the antenna conductor layer 20 and prevent the deterioration of the radiation efficiency.
  • the plurality of first holes Sp1 and the plurality of second holes Sp2 can be easily formed. More specifically, the insulator layer 16a (first insulator layer) is etched using the antenna conductor layer 20 as a mask to form a plurality of first openings Op1 each including the plurality of first openings Op1 when viewed in the vertical direction. A hole Sp1 is formed (first hole forming step). Furthermore, by etching the insulator layer 16e (second insulator layer) using the reference conductor layer 22 as a mask, a plurality of second holes Sp2 each including a plurality of second openings Op2 when viewed in the vertical direction are formed. are formed (second hole forming step).
  • the antenna conductor layer 20 and the reference conductor layer 22 are used as masks in this way, it is not necessary to form a new mask in order to form the plurality of first holes Sp1 and the plurality of second holes Sp2. do not have.
  • the plurality of first holes Sp1 and the plurality of second holes Sp2 can be easily formed.
  • the material of the insulating base material 12 is a thermoplastic resin, it is not necessary to use an adhesive layer made of a material different from the thermoplastic resin for joining the insulating layers 16a to 16e. Thereby, the insulating base material 12 can be easily formed by thermocompression bonding. Moreover, the insulating base material 12 can be easily plastically deformed.
  • FIG. 4 is a cross-sectional view of the antenna element 10a.
  • the antenna element 10a differs from the antenna element 10 in the following two points.
  • a high dielectric constant material 30 having a higher dielectric constant than the dielectric constant of the material of the insulating base 12 is provided in the plurality of first insulating base non-forming regions A1.
  • a high dielectric constant material 32 having a higher dielectric constant than the dielectric constant of the material of the insulating base 12 is provided in the plurality of second insulating base non-forming regions A2.
  • the high dielectric constant materials 30 and 32 are, for example, materials in which high dielectric ceramic powder is mixed with resin. High dielectric constant materials 30 and 32 are not part of insulating substrate 12 . The rest of the structure of the antenna element 10a is the same as that of the antenna element 10, so the description is omitted.
  • the method for manufacturing the antenna element 10a further includes steps S6 and S7 in FIG. More specifically, the high dielectric constant material 30 having a higher dielectric constant than the dielectric constant of the material of the insulating base material 12 is filled into the plurality of first holes Sp1 (step S6, first filling step). Further, the plurality of second holes Sp2 are filled with a high dielectric constant material 32 having a dielectric constant higher than that of the material of the insulating base material 12 (step S7, second filling step). The first filling step and the second filling step are performed, for example, by pressing paste of the high dielectric constant materials 30 and 32 into the plurality of first holes Sp1 and the plurality of second holes Sp2 with a squeegee. However, the holes located between the antenna conductor layer 20 and the reference conductor layer 24 are not filled with the high dielectric constant material.
  • each of the outer edges E1 of the plurality of first openings Op1 overlaps the plurality of first insulating base non-formation regions A1 when viewed in the vertical direction and is not in contact with the insulating base 12 .
  • a high dielectric constant material 30 having a higher dielectric constant than the dielectric constant of the material of the insulating base 12 is provided in the plurality of first insulating base non-forming regions A1. As a result, the dielectric constant near the antenna conductor layer 20 increases.
  • the wavelength of the high frequency signal transmitted through the antenna conductor layer 20 is shortened.
  • the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10a increases.
  • the number and size of the first holes Sp1 it is possible to adjust the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10a.
  • the antenna element 10a it is possible to obtain a structure with a high degree of freedom in designing the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10a.
  • each of the outer edges E2 of the plurality of second openings Op2 overlaps the plurality of second insulating base non-formation regions A2 when viewed in the vertical direction and is not in contact with the insulating base 12 .
  • a high dielectric constant material 32 having a higher dielectric constant than the dielectric constant of the material of the insulating base 12 is provided in the plurality of second insulating base non-forming regions A2. This increases the dielectric constant between the antenna conductor layer 20 and the reference conductor layer 22 .
  • the wavelength of the high frequency signal transmitted through the antenna conductor layer 20 is shortened.
  • the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10a increases.
  • the number and size of the second holes Sp2 it is possible to adjust the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10a.
  • the antenna element 10a it is possible to obtain a structure with a high degree of freedom in designing the frequency of the high-frequency signal that can be transmitted and received by the antenna element 10a.
  • the hole portion located between the antenna conductor layer 20 and the reference conductor layer 24 is not filled with a high dielectric constant material.
  • the electric field coupling between the antenna conductor layer 20 and the reference conductor layer 24 is reduced, and the radiation efficiency of the antenna conductor layer 20 is improved.
  • the antenna conductor layer 20 is miniaturized.
  • the deformation of the outer edge E1 of the first opening Op1 and the outer edge E2 of the second opening Op2 is caused by filling the high dielectric constant material in the first insulating base non-forming area A1 and the second insulating base non-forming area A2. is suppressed.
  • FIG. 5 is a top view of the insulator layer 16a of the antenna element 10b.
  • FIG. 6 is a cross-sectional view of the antenna element 10b.
  • the antenna element 10b differs from the antenna element 10 in the number and shape of the first openings Op1 and the number and shape of the first insulating base non-formation regions A1. More specifically, the antenna element 10b has one first aperture Op1. The number of first insulating base non-formation regions A1 is one.
  • the first opening Op1 has a strip shape extending in the front-rear direction (first direction) when viewed in the vertical direction. The length of the first opening Op1 in the front-rear direction is approximately half the wavelength of the high-frequency signal transmitted and received by the antenna conductor layer 20 .
  • the first insulating base non-formation region A1 has a strip shape extending in the front-rear direction (first direction) when viewed in the vertical direction.
  • the signal conductor layer 60 extends in the left-right direction.
  • the right end portion of the signal conductor layer 60 is positioned near the first opening Op1 when viewed in the vertical direction.
  • the antenna conductor layer 20 functions as a slot antenna.
  • the rest of the structure of the antenna element 10b is the same as that of the antenna element 10, so the description is omitted. According to the antenna element 10b, the same effects as those of the antenna element 10 can be obtained.
  • FIG. 7 is a cross-sectional view of the antenna element 10c.
  • the antenna element 10c differs from the antenna element 10 in that the second opening Op2 and the second insulating base non-formation area A2 do not exist.
  • the rest of the structure of the antenna element 10c is the same as that of the antenna element 10, so the description is omitted.
  • the antenna element 10c can have the same effect as the antenna element 10 does.
  • FIG. 8 is a cross-sectional view of the antenna element 10d.
  • the antenna element 10d differs from the antenna element 10a in that it further includes a first cover layer 70a and a second cover layer 70b.
  • the first cover layer 70 a covers the upper main surface (first main surface) of the insulating base material 12 .
  • the dielectric constant of the first cover layer 70 a is greater than that of the insulating base material 12 .
  • the second cover layer 70b covers the lower main surface (second main surface) of the insulating base material 12 .
  • the dielectric constant of the second cover layer 70b is greater than that of the insulating base material 12 .
  • Other structures of the antenna element 10d are the same as those of the antenna element 10a.
  • the antenna element 10d can have the same effect as the antenna element 10a.
  • the first cover layer 70 a covers the upper main surface (first main surface) of the insulating base material 12 . Therefore, the effect of shortening the wavelength of the high-frequency signal transmitted and received by the antenna conductor layer 20 is increased. Also, the antenna conductor layer 20 is protected by the first cover layer 70a. In addition, it is possible to simultaneously perform the filling of the material into the first insulating base non-formation region A1 and the second insulating base non-formation region A2 and the formation of the first cover layer 70a.
  • FIG. 9 is a cross-sectional view of the antenna element 10e.
  • the antenna element 10e is similar to the antenna element 10d in that the first cover layer 70a is provided with a plurality of through holes h1 and the second cover layer 70b is provided with a plurality of through holes h2. differ from Through holes h1 are provided in portions overlapping with the one or more first openings Op1 in the first cover layer 70a when viewed in the vertical direction.
  • the through hole h1 vertically penetrates the first cover layer 70a.
  • the diameter of the through hole h1 is smaller than the diameter of the first opening Op1.
  • Through holes h2 are provided in portions overlapping with the one or more second openings Op2 in the second cover layer 70b when viewed in the vertical direction.
  • the diameter of the through hole h2 is smaller than the diameter of the second opening Op2.
  • Other structures of the antenna element 10e are similar to those of the antenna element 10d.
  • the antenna element 10e can have the same effect as the antenna element 10d.
  • the through holes h1 are provided in the first cover layer 70a, the air in the first holes Sp1 can enter and exit. Therefore, even if the air inside the first holes Sp1 expands or contracts due to temperature changes such as reflow, the first cover layer 70 is less likely to peel off from the insulating base material 12 .
  • FIG. 10 is a cross-sectional view of the antenna element 10f.
  • the antenna element 10f differs from the antenna element 10c in that it further includes a first cover layer 70a.
  • the first cover layer 70 a covers the upper main surface (first main surface) of the insulating base material 12 .
  • the dielectric constant of the first cover layer 70 a is greater than that of the insulating base material 12 .
  • the vertical thickness of the first cover layer 70a of the antenna element 10f is greater than the vertical thickness of the first cover layer 70a of the antenna element 10d.
  • Other structures of the antenna element 10f are similar to those of the antenna element 10c.
  • the antenna element 10f can have the same effect as the antenna element 10c.
  • the first cover layer 70 a covers the upper main surface (first main surface) of the insulating base material 12 . Therefore, the effect of shortening the wavelength of the high-frequency signal transmitted and received by the antenna conductor layer 20 is increased. Also, the antenna conductor layer 20 is protected by the first cover layer 70a. In addition, it is possible to simultaneously perform the filling of the material into the first insulating base non-formation region A1 and the second insulating base non-formation region A2 and the formation of the first cover layer 70a.
  • FIG. 11 is a top view of the insulator layer 16a and a bottom view of the insulator layer 16e of the antenna element 10g.
  • the antenna element 10g differs from the antenna element 10 in that the antenna conductor layer 20 and the reference conductor layer 22 have a mesh structure. More specifically, the antenna conductor layer 20 is provided with a plurality of first openings Op1. The multiple first openings Op1 have an equilateral triangle shape. In addition, a plurality of first insulating base non-formation regions A1 are provided in the insulating base 12 . A plurality of first columnar portions 50 are provided on the insulating base 12 by connecting the plurality of first insulating base non-formation regions A1. The plurality of first columnar portions 50 extend in the vertical direction and are surrounded by the plurality of first insulating base non-forming regions A1 when viewed in the vertical direction.
  • a plurality of second openings Op2 are provided in the reference conductor layer 22 .
  • the multiple second openings Op2 have an equilateral triangular shape.
  • a plurality of second insulating base non-formation regions A2 are provided in the insulating base 12 .
  • a plurality of second columnar portions 52 are provided on the insulating base 12 by connecting the plurality of second insulating base non-forming regions A2.
  • the plurality of second columnar portions 52 extend in the vertical direction and are surrounded by the plurality of second insulating base non-forming regions A2 when viewed in the vertical direction.
  • the rest of the structure of the antenna element 10g is the same as that of the antenna element 10, so the description is omitted.
  • the antenna element 10g has the same effect as the antenna element 10 does.
  • FIG. 12 is an exploded perspective view of the antenna element 10h.
  • the antenna element 10h differs from the antenna element 10 in that the antenna conductor layers 20a and 20b are dipole antennas. Therefore, the antenna element 10h does not have the reference conductor layer 22.
  • FIG. Each of the antenna conductor layers 20a and 20b is provided on the upper main surface of the insulator layer 16a.
  • the antenna conductor layers 20a and 20b have a strip shape extending in the front-rear direction.
  • a signal conductor layer 55a is connected to the antenna conductor layer 20a.
  • a signal conductor layer 55b is connected to the antenna conductor layer 20b via an interlayer connection conductor v11.
  • a plurality of first openings Op1 are provided in each of the antenna conductor layers 20a and 20b. Further, the insulator layer 16a is provided with a plurality of first insulating base non-formation regions A1. The rest of the structure of the antenna element 10h is the same as that of the antenna element 10, so the explanation is omitted. The antenna element 10h can have the same effect as the antenna element 10. FIG.
  • the circuit board 200 has a first section A11 and a second section A12.
  • An antenna conductor layer 20 is provided in the first section A11. That is, the first section A11 has the same structure as the antenna elements 10, 10a-10h.
  • the antenna conductor layer 20 is not provided in the second section A12. However, a signal conductor layer electrically connected to the antenna conductor layer 20 is provided.
  • the first section A11 is not curved.
  • the second section A12 is curved. However, the first section A11 may be curved. In this case, the radius of curvature of the first section A11 is greater than the radius of curvature of the second section A12.
  • the portion having the maximum width in the direction orthogonal to the vertical direction of the holes Sp1a may be located below the upper main surface of the insulator layer 16a.
  • the air hole Sp1b may have a conical shape that is inverted upside down.
  • the air hole Sp1c may have a truncated cone shape that is inverted upside down.
  • the holes Sp1d may be formed in a plurality of insulator layers 16a and 16b.
  • the vacancies Sp1e may vertically penetrate between the upper main surface of the insulator layer 16a and the lower main surface of the insulator layer 16d.
  • an insulator layer 116a may be provided between the insulator layers 16a and 16b.
  • the material of the insulator layer 116a is, for example, fluororesin. Therefore, the insulator layer 116a is less likely to be removed by etching than the insulator layer 16a. Therefore, the vacancies Sp1f vertically penetrate only the insulator layer 16a.
  • a through hole H120 may be formed in the insulator layer 116a. In this case, the holes Sp1g are formed in the insulator layers 16a and 16b. Note that a conductor layer that is not etched may be provided instead of the insulator layer 116a in FIGS.
  • the antenna elements according to the present invention are not limited to the antenna elements 10, 10a to 10g, and can be modified within the scope of the gist thereof.
  • the configurations of the antenna elements 10, 10a to 10g may be combined arbitrarily.
  • the antenna element according to the present invention is not limited to the manufacturing method of the antenna elements 10, 10a to 10g, and can be changed within the scope of the gist thereof. Incidentally, each step of the method of manufacturing the antenna elements 10, 10a to 10g may be combined arbitrarily.
  • a low dielectric constant material having a lower dielectric constant than the dielectric constant of the material of the insulating base 12 may be provided in the plurality of first insulating base non-forming regions A1.
  • a low dielectric constant material having a dielectric constant lower than that of the material of the insulating base 12 may be provided in the plurality of second insulating base non-forming regions A2.
  • An insulator layer may be provided on the antenna conductor layer 20 in the antenna elements 10, 10a to 10g. This insulator layer is not part of the insulating substrate 12 . Further, an insulator layer may be provided under the reference conductor layer 22 in the antenna elements 10, 10a to 10g. This insulator layer is not part of the insulating substrate 12 .
  • the number of the first openings Op1 the number of the second openings Op2, the number of the first insulating base non-formation regions A1, the number of the second insulating base non-formation regions A2, the first space
  • the number of holes Sp1 and the number of second holes Sp2 should be one or more.
  • the reference conductor layers 22, 24, 26 are not essential components.
  • the first openings Op1 the number of the first insulating base non-formation regions A1, and the first holes Sp1 may not be provided.
  • the second openings Op2 the number of the second insulating base non-forming regions A2, and the second holes Sp2 may not be provided.
  • the insulating base material 12 does not have to be flexible.
  • the material of the insulating base material 12 may be a material other than a thermoplastic resin.
  • the insulator layers 16a-16e may be joined with an adhesive layer made of a material different from that of the insulator layers 16a-16e.
  • the crimping step may be performed after the first hole forming step and the second hole forming step.
  • the portion where the antenna conductor layer 20 is provided may be curved, or the line portion may be curved.
  • the dielectric constant of the first cover layer 70 a and the dielectric constant of the second cover layer 70 b may be smaller than the dielectric constant of the insulating base material 12 .
  • a layer of the same material as the insulator layers 16a to 16d may be laminated on the upper main surface of the insulating base material 12. In this case, this layer is not part of the insulating substrate 12 . That is, the layers laminated above the upper main surface of the insulating base 12 on which the antenna conductor layer 20 is provided are not part of the insulating base 12 .
  • the material filled in the first insulating base non-formation region A1 and the second insulating base non-formation region A2 is different from the material of the first cover layer 70a and the material of the second cover layer 70b. may be

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PCT/JP2022/015284 2021-05-07 2022-03-29 アンテナ素子、電子機器及びアンテナ素子の製造方法 Ceased WO2022234748A1 (ja)

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CN202290000382.6U CN220856913U (zh) 2021-05-07 2022-03-29 天线元件以及电子设备
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