WO2016017278A1 - 車載用アンテナ装置 - Google Patents
車載用アンテナ装置 Download PDFInfo
- Publication number
- WO2016017278A1 WO2016017278A1 PCT/JP2015/066362 JP2015066362W WO2016017278A1 WO 2016017278 A1 WO2016017278 A1 WO 2016017278A1 JP 2015066362 W JP2015066362 W JP 2015066362W WO 2016017278 A1 WO2016017278 A1 WO 2016017278A1
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- WIPO (PCT)
- Prior art keywords
- vehicle
- antenna
- base
- metal base
- antenna device
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
- H01Q1/1214—Supports; Mounting means for fastening a rigid aerial element through a wall
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
- H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
- H01Q1/425—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising a metallic grid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/002—Antennas or antenna systems providing at least two radiating patterns providing at least two patterns of different beamwidth; Variable beamwidth antennas
Definitions
- the present invention relates to an in-vehicle antenna device attached to, for example, a roof of a vehicle.
- Patent Document 1 discloses a structure in which a metal base is assembled to the resin base from the inside of the antenna.
- the size of the metal base is set according to the size of the antenna to be mounted and the necessity of the ground depending on the antenna system, and the base is made of resin for the antenna that does not require a ground. It can be made as small as possible.
- Patent Document 1 when a resin base enters between a metal base and a vehicle body (for example, a roof) and a broadband antenna such as LTE is integrated, the distance between the metal base and the vehicle body (ground) is There is a case where the antenna gain is lowered due to occurrence of this unnecessary resonance within a required frequency band.
- a broadband antenna such as LTE
- the present invention has been made in view of such a situation, and an object thereof is to provide an in-vehicle antenna device capable of preventing a decrease in antenna gain due to unnecessary resonance between a metal base and a vehicle body. There is.
- One embodiment of the present invention is an in-vehicle antenna device.
- This in-vehicle antenna device An antenna base, An antenna case that covers the antenna base from above; Comprising an antenna element and an amplifier board provided inside the antenna case;
- the antenna base includes a resin base having an opening, and a cylindrical portion for mounting on a vehicle body that is smaller in area than the resin base and provided on the resin base so as to close the opening.
- a metal base having A conductor plate is attached to the surface of the resin base opposite to the arrangement surface of the metal base.
- the conductor plate may be electrically connected to the metal base.
- the outer edge of the conductor plate excluding the side facing the cylindrical part side substantially coincides with the outer edge of the metal base when viewed from the axial direction of the cylindrical part or is outside the outer edge of the metal base. Also good.
- the conductor plate may have at least one leaf spring portion extending so as to approach the vehicle body side.
- the conductor plate may be provided before and after the cylindrical portion.
- a resin part that prevents the metal base from coming into direct contact with the inner peripheral portion of the mounting hole may be provided at a portion of the metal base facing the inner peripheral portion of the mounting hole of the vehicle body.
- the resin part may be a holder for temporarily fixing the vehicle-mounted antenna device to the vehicle body.
- a boss that engages with the inner peripheral portion of the mounting hole of the vehicle body may be provided on the surface of the resin base on the vehicle body side.
- the antenna element may include a capacitive element, a coil element, and another antenna element having a frequency band different from that of the capacitive element and the coil element.
- the shape and size of the metal base may be set so that unnecessary resonance occurs in the vicinity of the lowest frequency in the reception frequency band of the other antenna element without the conductor plate.
- a filter substrate may be provided between the capacitive element and the coil element.
- the coil element is obtained by winding a bobbin.
- a first terminal to which one end of the coil element is electrically connected is provided on one end side of the bobbin,
- the lower surface of the filter substrate may be in contact with and electrically connected to the first terminal, and the upper surface of the filter substrate may be in contact with and electrically connected to the capacitive element.
- connection portion of the first terminal, the filter substrate, and the capacitive element may be screwed to the antenna case in a state of overlapping each other and electrically connected to each other at the screwed portion.
- An element holder for supporting the capacitive element and the coil element may have a placement portion on which the filter substrate is placed.
- the mounting portion may support the filter substrate so as to be slidable, and may lock the filter substrate with a locking claw at a predetermined sliding position.
- an in-vehicle antenna device capable of preventing a decrease in antenna gain due to unnecessary resonance between a metal base and a vehicle body.
- FIG. 3 is an AA enlarged sectional view of FIG.
- FIG. 2 is an external view of a metal base 60 in FIG. 1.
- the external view of the conductor board 90 of FIG. The perspective view of the decomposition
- FIG. 14 is a perspective view of a combined state of the bobbin 41, the upper terminal 45, and the lower terminal 47 of FIG. Manufacturing process explanatory drawing of the coil element 40.
- FIG. 2 is an external view of a filter substrate 30 in FIG. 1.
- FIG. 6 is an explanatory diagram of an attachment process of the filter substrate 30 to the element holder 20.
- FIG. FIG. 23 is a cross-sectional view taken along the line AA in FIG. BB expanded sectional view of FIG.
- FIG. 1 is an exploded perspective view of a vehicle-mounted antenna device according to an embodiment of the present invention.
- FIG. 2A is a front view of the in-vehicle antenna device.
- 2B is a side view thereof, and
- FIG. 2C is a bottom view thereof.
- FIG. 3 is a side sectional view of the on-vehicle antenna device.
- FIG. 4 is a lower perspective view of the in-vehicle antenna device with the conductor plate 90 disassembled.
- FIG. 5 is a lower perspective view of the in-vehicle antenna device.
- FIG. 6 is an AA enlarged sectional view of FIG.
- FIG. 7A is a bottom view of the metal base 60 of FIG. 7B is a cross-sectional view of the same back, FIG.
- FIG. 7C is a side view of the same, and FIG. 7D is a cross-sectional view of the same side.
- FIG. 8A is an immediate sectional view of the resin base 70 of FIG.
- FIG. 8B is a side view thereof, and
- FIG. 8C is a bottom view thereof.
- FIG. 9A is a side view of the conductor plate 90 of FIG.
- FIG. 9B is a bottom view thereof, and
- FIG. 9C is a rear view thereof.
- the antenna case 1 is made of a radio wave permeable synthetic resin (molded product made of resin such as PC or PET), and has a shark fin shape with both side surfaces curved inward.
- the antenna base is a combination of a metal base 60 and a resin base 70.
- the resin base 70 has through holes 72 a and 72 b at the center of the flat plate portion 71.
- a pair of bosses (projections) 71 a that engage with the inner edge of the mounting hole of the vehicle body are provided on the lower surface (vehicle body side surface) of the flat plate-like portion 71.
- the metal base 60 has a smaller area than the resin base 70, and is attached to the flat plate portion 71 of the resin base 70 with eight screws 103 so as to close the through holes 72a and 72b of the resin base 70 ( Fixed).
- the metal base 60 has a flat plate portion 61 that covers the through holes 72a and 72b, and a male screw that protrudes downward from the flat plate portion 61 and is attached to a vehicle body (for example, a roof as a mounted panel). And a cylindrical portion for feeding (hollow screw shaft portion) 62.
- Convex portions 61 a and 61 b (FIG. 4) that fit into the through holes 72 a and 72 b of the resin base 70 are provided on the lower surface of the flat plate portion 61.
- the power feeding cylindrical portion 62 extends below the resin base 70 from the convex portion 61a.
- the amplifier substrate 50 is attached (fixed) by screwing or the like.
- the amplifier board 50 is provided with a pair of conductor leaf springs (terminals) 51. From the amplifier board 50, the output cable 52 extends downward, passes through the inside of the feeding cylindrical portion 62, and is drawn to the outside.
- An annular seal member 5 is provided between the flat plate portion 71 of the resin base 70 and the vehicle body.
- the seal member 5 is provided around the through holes 72a and 72b of the resin base 70, and is sandwiched and pressed between the flat plate portion 71 of the resin base 70 and the vehicle body. Prevent water from entering through the gaps.
- the pad 3 is an elastic member such as an elastomer or rubber, and is provided on the resin base 70 so as to make a round along the peripheral portion of the resin base 70 or its vicinity.
- the pad 3 functions as a blindfold for the gap between the lower end edge of the antenna case 1 and the vehicle body, and also has a simple waterproof function between the resin base 70 and the vehicle body (the main waterproof function is that the seal member 5 has Have).
- the antenna case 1 is placed on the resin base 70 from above with the pad 3 interposed therebetween, and is attached (fixed) to the resin base 70 with nine screws 104.
- the antenna case 1 has a rib 1a (FIG. 3) that presses the pad 3 against the resin base 70 over the entire circumference.
- Boss 1b, 1c with a screw hole is provided in the ceiling part of the antenna case 1.
- FIG. 3 The LTE element 6, the satellite radio antenna 7, the capacitive element 10, and the coil element 40 as antenna elements are provided in a space between the antenna case 1 and the antenna base (the metal base 60 and the resin base 70).
- the capacitive element 10 and the coil element 40 are antenna elements for AM / FM reception.
- the LTE element 6 and the satellite radio antenna 7 are examples of antenna elements different from those for AM / FM reception.
- the LTE element 6 is a metal plate (conductor plate) and is supported by a holder 6c erected on the substrate 6b.
- the substrate 6b is attached (fixed) onto the flat plate portion 71 of the resin base 70 by screws or the like.
- An output cable 6a extends from the substrate 6b and passes through the inside of the feeding cylindrical portion 62 together with the output cable 52 of the amplifier substrate 50 and is drawn out to the outside.
- the satellite radio antenna 7 is provided on the flat plate portion 71 of the resin base 70.
- the output cable 7 a of the satellite radio antenna 7 passes through the inside of the feeding cylindrical portion 62 together with the output cable 6 a of the LTE element 6 and is drawn out to the outside.
- the capacitive element 10 is a metal plate (conductor plate), and is bent by, for example, drawing so as to have an umbrella-shaped curved surface portion 11 substantially parallel to the curved ceiling surface at the inner upper portion of the antenna case 1.
- the curved surface portion 11 is close to the ceiling surface of the antenna case 1.
- the connection part 12 has a through hole 13 (FIG. 3) at the tip part. The upper surface around the through hole 13 of the connecting portion 12 abuts on the end surface of the boss 1b with screw hole (FIG. 3) of the antenna case 1.
- the lower surface around the through hole 13 of the connecting portion 12 abuts on the upper surface side of a conductor pattern 31a of the filter substrate 30 described later.
- the lower surface side of the conductor pattern 31 a of the filter substrate 30 is in contact with the upper terminal 45 of the coil element 40.
- the curved surface portion 11 is provided with a through hole 14 (FIG. 1) on the rear side.
- the threaded boss 1c (FIG. 3) of the antenna case 1 passes through the inside of the through hole 14.
- the element holder 20 includes a base portion 21, a cylindrical portion 22, a through hole 23, and a placement portion 24.
- the cylindrical portion 22 rises from the base portion 21, and the boss 1c with a screw hole of the antenna case 1 is fitted inside (FIG. 3).
- the element holder 20 is attached (fixed) to the antenna case 1 with the capacitative element 10 sandwiched between the screws 102 screwed into the screw hole bosses 1c.
- Protruding portions 22 a are respectively provided on the front and rear sides of the cylindrical portion 22.
- the protrusion 22 a presses the capacitive element 10 against the ceiling surface of the antenna case 1.
- the through hole 23 is provided in the base portion 21 and is positioned in front of the cylindrical portion 22.
- the element holder 20 has a space for positioning and supporting (fitting) an upper part of a bobbin 41 of a coil element 40 to be described later, below the through hole 23.
- the periphery and the back of the through hole 23 of the base portion 21 are placement portions 24 on which the filter substrate 30 is placed.
- the placement unit 24 will be described later.
- the filter substrate 30 is mounted (temporarily fixed) by being slid from the front to the mounting portion 24.
- the coil element 40 is a resin bobbin 41 provided with a winding 42.
- An upper terminal 45 is provided at one end (upper end) of the bobbin 41 (for example, press-fitted and fixed).
- One end of the winding 42 is electrically connected to the upper terminal 45.
- a lower terminal 47 is provided at the other end (lower end) of the bobbin 41 (for example, press-fitted and fixed).
- the other end of the winding 42 is electrically connected to the lower terminal 47.
- the upper terminal 45 is attached (fixed) to the screw hole boss 1b of the antenna case 1 with the screw 101 between the filter substrate 30 (conductive pattern 31a) and the connection portion 12 of the capacitive element 10.
- the screw 101 passes through the through hole 45 d of the upper terminal 45, the through hole 31 of the filter substrate 30, and the through hole 13 of the connection portion 12 of the capacitor element 10, and is screwed into the screw hole boss 1 b of the antenna case 1.
- the coil element 40 and the capacitive element 10 are electrically connected to each other, and the filter substrate 30 is electrically connected between the coil element 40 and the capacitive element 10.
- the screw 101 is preferably provided with a spring washer to prevent poor connection due to looseness.
- the connecting leg 47 b of the lower terminal 47 is sandwiched between a pair of conductor plate springs 51 of the amplifier board 50. Thereby, the coil element 40 and the amplifier board 50 are electrically connected to each other.
- Two conductor plates 90 are attached (fixed) by eight screws 103 to the surface (lower surface) opposite to the arrangement surface (upper surface) of the metal base 60 in the flat plate portion 71 of the resin base 70. ).
- One conductor plate 90 is located in front of the feeding cylindrical portion 62, and the other conductor plate 90 is located behind the feeding cylindrical portion 62.
- the outer edge of the conductor plate 90 (three sides excluding the side facing the feeding cylindrical portion 62) is close to the inner edge of the seal member 5 and is made of metal as viewed from the axial direction (vertical direction) of the feeding cylindrical portion 62. It substantially coincides with the outer edge of the base 60.
- the conductor plate 90 has screwing portions 93 at the four corners of the flat plate portion 91.
- the screwing portion 93 has a through hole 93 a through which the screw 103 is passed, and is bent in an L shape so as to be one step higher than the flat plate-like portion 91.
- the screw 103 attaches the conductive plate 90 to the lower surface of the resin base 70 and attaches the metal base 60 to the upper surface of the resin base 70.
- the metal base 60 and the conductor plate 90 are electrically connected by the screw 103.
- the conductor plate 90 has four leaf spring portions 92 that are bent obliquely downward from the flat plate-like portion 91 and extend so as to approach the vehicle body side.
- the front end of the leaf spring portion 92 faces the feeding cylindrical portion 62 and comes into contact with the vehicle body roof (compressed by the vehicle body roof).
- FIG. 10 is a perspective view of the disassembled state of the metal base 60 and the temporary fixing holder 80 of the in-vehicle antenna device.
- FIG. 11 is a perspective view of a combined state of the metal base 60 and the temporary fixing holder 80 of FIG.
- FIG. 12A is a lower perspective view of the vehicle-mounted antenna device in a state where the vehicle-mounted antenna device is mounted in the through hole 111 of the vehicle body roof 110.
- FIG. 12B is a bottom view of the same.
- the temporarily fixing holder 80 as a resin part has a U-shaped or C-shaped outer shape, and can be engaged (fitted) to the side surface of the feeding cylindrical portion 62 from the lateral direction perpendicular to the axial direction. is there.
- the temporary fixing holder 80 temporarily fixes the feeding cylindrical portion 62 in a state of being inserted from the outside into the through hole 111 of the vehicle body roof 110 as the mounted panel.
- the temporary fixing holder 80 is made of, for example, a flexible resin, and includes a pair of sandwiching portions 81 that sandwich the feeding cylindrical portion 62, a connecting portion 82 that connects the sandwiching portions 81, and each sandwiching portion 81. And a locking claw 83 formed so as to protrude outward at the tip portion.
- the feeding cylindrical portion 62 has a pair of first groove portions 63 (FIGS. 7B and 10) that engage with the temporary fixing holder 80 and one second groove portion 64 in the middle thereof on the side surface. .
- the temporary fixing holder 80 is attached to the feeding cylindrical portion 62 by engaging with the first groove portion 63 and the second groove portion 64. That is, the pair of sandwiching portions 81 engages with the pair of first groove portions 63 so as to sandwich the feeding cylindrical portion 62, and the communication portion 82 engages with the second groove portion 64. Then, after the temporary fixing holder 80 is mounted on the power supply cylindrical portion 62 and the power supply cylindrical portion 62 is inserted into the through hole 111 of the vehicle body roof 110, the locking claw 83 is caught on the inner surface of the roof, A stop function can be achieved. As shown in FIGS.
- the resin temporary fixing holder 80 is provided between the feeding cylindrical portion 62 and the inner edge portion (inner peripheral portion) of the through hole 111 of the vehicle body roof 110. It intervenes and prevents both from being in direct contact with each other, ie, being electrically connected.
- FIG. 13 is a perspective view of the coil element 40 in FIG. 1 in an exploded state of the bobbin 41, the upper terminal 45, and the lower terminal 47.
- FIG. FIG. 14 is a perspective view of the combined state of the bobbin 41, the upper terminal 45, and the lower terminal 47 of FIG.
- FIG. 15 is an explanatory diagram of the manufacturing process of the coil element 40.
- the upper terminal 45 includes a base portion 45a, a pair of mounting leg portions 45b, and a winding terminal connection portion (tab) 45c.
- a through hole 45d is provided at the center of the base 45a.
- the pair of mounting leg portions 45b are bent in a U shape with respect to the base portion 45a, and are positioned on opposite sides of the center of the base portion 45a.
- the winding terminal connection portion 45c is bent in an L shape with respect to the base portion 45a, and is located at a position that is 90 degrees different from the mounting leg portion 45b in the direction around the axis.
- the lower terminal 47 has an upper surface portion 47a, a connection leg portion 47b, a winding terminal connection portion (tab) 47c, a side surface portion 47e, and a lower surface portion 47f.
- a leaf spring portion 47d that is bent obliquely downward is provided at the center of the upper surface portion 47a.
- the leaf spring portion 47d has a function of preventing rattling with respect to the lower terminal mounting portion 44 of the bobbin 41.
- the connecting leg 47b is bent downward with respect to the base 45a.
- the winding terminal connection portion 47c extends outward from the upper surface portion 47a.
- the side surface portion 47e is bent downward with respect to the upper surface portion 47a at both ends of the upper surface portion 47a.
- the lower surface portion 47f is a portion where the lower end of one side surface portion 47e is bent to be substantially parallel to the upper surface portion 47a.
- the lower terminal 47 is mounted on the lower terminal mounting portion 44 so as to surround the lower terminal mounting portion 44 by the upper surface portion 47a, the side surface portion 47e, and the lower surface portion 47f.
- the bobbin 41 has an upper terminal mounting portion 43 to which the upper terminal 45 is attached, a lower terminal mounting portion 44 to which the lower terminal 47 is attached, and a cylindrical winding drum portion 48 in which the winding 42 is provided on the outer peripheral surface.
- the upper terminal mounting portion 43 is provided on the upper end surface of the winding drum portion 48 so as to be divided on both sides with the central axis of the winding drum portion 48 interposed therebetween.
- the upper terminal mounting portion 43 has a pair of convex portions 43a that protrude outward and in opposite directions. The pair of convex portions 43 a engages with the pair of mounting leg portions 45 b of the upper terminal 45.
- the lower terminal mounting portion 44 is provided so as to protrude outward at the lower end portion of the winding drum portion 48.
- a guide groove 48 a serving as a path of the winding 42 and a plurality of protrusions 48 b along the path of the winding 42 are provided on the outer peripheral surface of the winding body 48.
- the guide groove 48a spirals around the outer peripheral surface of the winding body 48.
- At least one protrusion 48b is provided at each of a plurality of circumferential positions (a circumferential position where a later-described winding terminal connecting portion 45c of the upper terminal 45 can exist) on the outer peripheral surface of the winding body 48.
- a plurality of projections 48b (10 on one side and 11 on the other side) are provided at two circumferential positions different from each other by 180 degrees on the outer peripheral surface of the winding drum portion 48.
- Each protrusion 48b functions as a hook portion when the winding end end portion of the winding 42 is pulled out in the axial direction.
- the protrusion 48b has a plate shape from the viewpoint of securing strength.
- the upper terminal 45 and the lower terminal 47 are connected to the upper terminal mounting portion 43 and the lower terminal mounting portion 44 of the bobbin 41. Slide each to install. After that, as shown in FIG. 15C, the bent end portion of the wire (wire) 42 ′ to be the winding 42 is hooked on the winding terminal connection portion 47c of the lower terminal 47 and connected by soldering or welding. Fix it. Subsequently, as shown in FIGS. 15D and 15E, the winding 42 is applied to the outer peripheral surface (guide groove 48 a) of the winding body 48 of the bobbin 41 while rotating the bobbin 41.
- the pitch between the windings of the winding 42 is determined by the arrangement pitch of the guide grooves 48a. Subsequently, as shown in FIGS. 15 (F), 15 (G), and 15 (H), the winding 42 is hooked on a predetermined protrusion 48b of the winding body 48, and the winding end portion is hooked. The terminal is pulled out in the axial direction, and the terminal of the winding 42 is connected and fixed to the winding terminal connecting part 45c of the upper terminal 45 by soldering or welding, and the surplus portion is cut.
- the above series of operations can be performed by an automatic winding machine. Thus, the coil element 40 is completed.
- the upper terminal 45 is fixed to the boss 1 b with the screw hole of the antenna case 1 together with the capacitive element 10 with the screw 101, and then the connection leg 47 b of the lower terminal 47. And the conductor plate spring 51 of the amplifier board 50 are aligned, and the combination of the amplifier board 50, the metal base 60, and the resin base 70 is attached to the antenna case 1 by screws or the like.
- the upper terminal 45 can be attached to the bobbin 41 by being inverted 180 degrees.
- the number of turns of the winding 42 can be changed in units of 0.5 turns by changing the protrusion 48b that hooks the winding end portion of the winding 42 and, if necessary, reversing the upper terminal 45 by 180 degrees.
- FIG. 16 is a perspective view of the element holder 20 of FIG. 17 is a plan view
- FIG. 18 is a side view
- FIG. 19 is a front view
- FIG. 20A is a plan view of the filter substrate 30 of FIG.
- FIG. 20B is a side view thereof
- FIG. 20C is a bottom view thereof.
- FIG. 21 is an explanatory diagram of the process of attaching the filter substrate 30 to the element holder 20.
- FIG. 22 is a plan view of the element holder 20 that temporarily holds the filter substrate 30.
- 23 is a cross-sectional view taken along line AA in FIG. 24 is an enlarged cross-sectional view taken along the line BB in FIG.
- the element holder 20 has a placement portion 24 on which the filter substrate 30 is placed, and locking claws 24b are provided on both sides of the placement portion 24, respectively.
- the pair of protrusions 24 a protrudes inward on both upper sides of the through hole 23.
- the filter substrate 30 has a pair of notches 35 on the left and right.
- the filter substrate 30 has conductive patterns 31a on both sides around the through hole 31, an inductive pattern 32a on the upper surface, and an inductive pattern 32b on the lower surface.
- the inductive patterns 32 a and 32 b are extended from the conductive pattern 31 a and are connected to each other through the through holes 34.
- a chip capacitor 33 is provided in the middle of the inductive pattern 32a.
- FIG. 25A is a bottom perspective view of the main part of the vehicle-mounted antenna device according to Comparative Example 1.
- FIG. 25B is a bottom perspective view of the main part of the vehicle-mounted antenna device according to Comparative Example 2.
- a comparative example 1 shown in FIG. 25A is a conventional type in which the conductor plate 90 in the embodiment is not provided, and the temporary fixing holder 880 to the vehicle body is mounted from above the metal base 860. There is no contrivance to prevent direct contact with the metal base 860.
- Comparative Example 2 shown in FIG. 25 (B) has the conductor plate 90 in the embodiment, but as in Comparative Example 1, there is no contrivance to prevent direct contact between the vehicle body roof and the metal base 960. .
- FIG. 26 is a graph showing VSWR vs. frequency characteristics of the in-vehicle antenna devices according to the ideal state without unnecessary resonance, the embodiment, and Comparative Examples 1 and 2.
- FIG. 27 is an enlarged characteristic diagram in the vicinity of 700 MHz in FIG.
- the first frequency band and the second frequency band shown in these drawings are frequency bands used in LTE. In the second frequency band, characteristics close to the ideal state are obtained in any configuration.
- the configurations of Comparative Example 1 and Comparative Example 2 have characteristics greatly deviated from the ideal state.
- the configuration of the embodiment has characteristics that are relatively close to the ideal state.
- the characteristic close to the ideal state according to the configuration of the embodiment is that the capacitance increases as the conductive plate 90 enters between the metal base 60 and the vehicle body roof, and the resonance frequency moves to a frequency band lower than the first frequency band. This is due to the effect of preventing the direct contact between the metal base 60 and the inner periphery of the mounting hole of the vehicle body roof by the temporary fixing holder 80 (the effect of not causing an unintended conduction path).
- the characteristics greatly deviate from the ideal state in bands other than the first frequency band and the second frequency band (300 MHz to 400 MHz), but there is no problem because this band is not used. .
- the VSWR in the used frequency band is brought close to the ideal state by moving the frequency band in which the VSWR shift due to unnecessary resonance occurs to the unused band (decrease in antenna gain). Can be prevented).
- the size and shape of the metal base 60 of the present embodiment is the lowest in the frequency band used in LTE as shown in FIG. 26 in a state where unnecessary resonance countermeasures are not taken as in Comparative Example 1. Designed to cause unwanted resonance near the frequency.
- the size of the substrate 50 placed on the metal base 60 is also taken into consideration. First, the length in the short side direction of the metal base 60 forming a rectangle is determined in accordance with the size of the substrate, Subsequently, the length in the long side direction is determined to be near the lowest frequency in the frequency band where unnecessary resonance is received.
- the conductor plate 90 is provided on the surface of the plastic resin base 70 opposite to the surface on which the metal base 60 is disposed, the metal base 60 resonates according to the distance from the vehicle body roof (ground). It can be prevented that unnecessary resonance due to having a point occurs in a required frequency band and the antenna gain is lowered.
- the conductor plate 90 has a leaf spring portion 92, and the leaf spring portion 92 is compressed by the vehicle body roof, so that the leaf spring portion 92 and the vehicle body roof can be reliably contacted even if the curvature of the vehicle body roof changes. It is possible to reliably prevent the antenna gain from being lowered.
- the filter substrate 30 is provided between the capacitive element 10 and the coil element 40, adverse effects due to interference between the antenna elements in the antenna case 1 can be reduced. Specifically, it is possible to prevent the second or third harmonics of the capacitive element 10 and the coil element 40 (AM / FM) from entering the LTE element 6 and lowering the antenna gain of the LTE element 6.
- the filter substrate 30 is fixed by screws 101 in a state (laminated state) sandwiched between the upper terminal 45 of the coil element 40 and the connection portion 12 of the capacitive element 10, and by this screwing, the capacitive element 10 and Because of the configuration in which the coil elements 40 are electrically connected, mechanical fixing and electrical connection of the filter substrate 30 can be performed collectively and easily, and the assemblability is good.
- the eaves element holder 20 has a mounting portion 24 on which the filter substrate 30 is mounted, and the filter substrate 30 is temporarily fixed at a predetermined position by the locking claws 24b and the protruding portions 24a and 24c.
- the filter substrate 30 does not need to be aligned and is easy to assemble.
- a conductive plate 90 is provided. By moving unnecessary resonance to a low frequency band, the unnecessary resonance position can be reliably removed from the reception frequency band.
- the conductor plate 90 can exhibit a certain effect in preventing a decrease in antenna gain.
- the conductor plate 90 can exert a certain effect for preventing a decrease in antenna gain. Even if the outer edge of the conductor plate 90 (three sides excluding the side facing the feeding cylindrical portion 62) is outside the outer edge of the metal base 60 when viewed from the axial direction (vertical direction) of the feeding cylindrical portion 62. Good
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Abstract
Description
アンテナベースと、
前記アンテナベースに上方から被せられたアンテナケースと、
前記アンテナケースの内側に設けられたアンテナエレメント及びアンプ基板とを備え、
前記アンテナベースは、開口部を有する樹脂製ベースと、前記樹脂製ベースより小面積であって前記開口部を塞ぐように前記樹脂製ベース上に設けられた、車体への装着用の筒状部を有する金属製ベースとを有し、
前記樹脂製ベースの、前記金属製ベースの配置面とは反対側の面に、導体板が取り付けられている。
前記ボビンの一端側には、前記コイルエレメントの一端が電気的に接続される第1の端子が設けられ、
前記フィルタ基板の下面が前記第1の端子と接触して電気的に接続され、前記フィルタ基板の上面が前記容量エレメントと接触して電気的に接続されていてもよい。
前記エレメントホルダは、前記フィルタ基板を載置する載置部を有してもよい。
Claims (11)
- アンテナベースと、
前記アンテナベースに上方から被せられたアンテナケースと、
前記アンテナケースの内側に設けられたアンテナエレメント及びアンプ基板とを備え、
前記アンテナベースは、開口部を有する樹脂製ベースと、前記樹脂製ベースより小面積であって前記開口部を塞ぐように前記樹脂製ベース上に設けられた、車体への装着用の筒状部を有する金属製ベースとを有し、
前記樹脂製ベースの、前記金属製ベースの配置面とは反対側の面に、導体板が取り付けられている、車載用アンテナ装置。 - 前記導体板が、前記金属製ベースと電気的に接続されている、請求項1に記載の車載用アンテナ装置。
- 前記導体板の、前記筒状部側に臨む辺を除く外縁が、前記筒状部の軸方向から見て前記金属製ベースの外縁と略一致する又は前記金属製ベースの外縁より外側にある、請求項1又は2に記載の車載用アンテナ装置。
- 前記導体板は、車体側に近づくように延びる少なくとも1つの板バネ部を有する、請求項1から3のいずれか一項に記載の車載用アンテナ装置。
- 前記導体板は、前記筒状部の前後にそれぞれ設けられている、請求項1から4のいずれか一項に記載の車載用アンテナ装置。
- 前記金属ベースの、車体の取付穴の内周部と対向する部分に、前記金属ベースが前記取付穴の内周部と直接接触することを防止する樹脂製部品が設けられている、請求項1から5のいずれか一項に記載の車載用アンテナ装置。
- 前記樹脂製部品が、本車載用アンテナ装置の車体への仮固定用のホルダである、請求項6に記載の車載用アンテナ装置。
- 前記樹脂製ベースの車体側の面に、車体の取付穴の内周部と係合するボスが設けられている、請求項6又は7に記載の車載用アンテナ装置。
- 前記アンテナエレメントは、容量エレメントと、コイルエレメントと、前記容量エレメント及び前記コイルエレメントとは異なる周波数帯の別のアンテナエレメントとを含む、請求項1から8のいずれか一項に記載の車載用アンテナ装置。
- 前記金属製ベースの形状及び大きさは、前記導体板が無い状態で前記別のアンテナエレメントの受信周波数帯における最も低い周波数付近で不要共振が発生するように設定されている、請求項1から9のいずれか一項に記載の車載用アンテナ装置。
- 前記容量エレメント及び前記コイルエレメントの間にフィルタ基板が設けられている請求項1から10のいずれか一項に記載の車載用アンテナ装置。
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US15/329,644 US10355335B2 (en) | 2014-07-28 | 2015-06-05 | Vehicle antenna device |
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CA2956504A1 (en) | 2016-02-04 |
CN106575820A (zh) | 2017-04-19 |
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DE112015003498T5 (de) | 2017-04-27 |
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