CN110890634A - Antenna device and method for manufacturing the same - Google Patents
Antenna device and method for manufacturing the same Download PDFInfo
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- CN110890634A CN110890634A CN201811058340.4A CN201811058340A CN110890634A CN 110890634 A CN110890634 A CN 110890634A CN 201811058340 A CN201811058340 A CN 201811058340A CN 110890634 A CN110890634 A CN 110890634A
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- antenna
- resonance point
- coil
- point adjusting
- antenna device
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title claims description 4
- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 description 8
- 241000251730 Chondrichthyes Species 0.000 description 6
- 230000010354 integration Effects 0.000 description 4
- 230000005855 radiation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- 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
-
- 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
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- Details Of Aerials (AREA)
Abstract
The invention provides an antenna device and a manufacturing method thereof. In the antenna device, impedance can be adjusted by changing the installation angle of the coil of the antenna part without depending on the integrated circuit. An antenna device (1) mounted on a vehicle is provided with an antenna unit (10) and an amplifier substrate (20), wherein the amplifier substrate (20) is provided with an amplifier that amplifies a signal received by the antenna unit. The antenna unit includes a metal plate (11) and a resonance point adjusting coil (12) having one end connected to the metal plate, and the resonance point adjusting coil is connected to the input of the amplifier substrate via the metal plate. The impedance of the antenna part can be adjusted by the installation angle of the resonance point adjusting coil.
Description
Technical Field
The invention relates to an antenna device and a manufacturing method thereof.
Background
As an antenna device mounted on a vehicle, an AM/FM radio antenna capable of receiving AM broadcasts and FM broadcasts is provided, and as an antenna for AM/FM radio, a rod-type antenna has been conventionally used, but in recent years, a shark fin-type antenna is preferable from the viewpoint of appearance. The shark fin-shaped antenna has an appearance shape similar to a dorsal fin of a shark, and is so called according to its appearance shape.
From the viewpoint of regulations and the like, shark fin-type antennas are often configured under height restrictions such as a height of 70mm or less and under length restrictions such as a length of about 200mm in the longitudinal direction.
Therefore, the low attitude is formed under the height restriction, so that there is a problem that the impedance (radiation resistance) is lowered and the reception sensitivity is deteriorated.
For example, patent document 1 discloses an antenna device for solving the problem.
In the antenna device disclosed in patent document 1, an amplifier (amplifier) is used to compensate for a decrease in the reception efficiency of the antenna due to lowering of the attitude.
Documents of the prior art
Patent document 1: japanese patent No. 5237617
Disclosure of Invention
Problems to be solved by the invention
However, since the antenna is reduced in size (posture), the impedance (radiation resistance) of the antenna is reduced as described above, and thus the integration loss with the amplifier is likely to occur.
By forming an integrated circuit by providing a resistor, a capacitor, and an inductor in addition to the antenna and adjusting the impedance, the integration loss can be reduced, but the cost is increased.
The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to adjust impedance by changing the angle of attachment of a coil of an antenna unit without depending on an integrated circuit in an antenna device.
Means for solving the problems
The antenna device according to claim 1, wherein the other end of the resonance point adjusting coil is open.
The antenna device according to claim 3 or 2, wherein the antenna device has a characteristic that the impedance of the antenna portion can be adjusted by an attachment angle of the resonance point adjusting coil.
The antenna device according to any one of claims 1 to 3, wherein a direction from a connection side of the resonance point adjusting coil with the metal plate toward an opposite side of the resonance point adjusting coil along a central axis of the resonance point adjusting coil is a vertically downward direction.
The antenna device according to claim 5 to any one of claims 1 to 3, wherein the mounting angle of the resonance point adjusting coil is set to 0 ° and a mounting angle of 90 ° is set when a direction from a connection side of the resonance point adjusting coil with the metal plate toward an opposite side of the resonance point adjusting coil along a central axis of the resonance point adjusting coil is a vertical downward direction.
Claim 6 is a method of manufacturing an antenna device according to any one of claims 1 to 5, wherein a mounting angle of the resonance point adjusting coil is adjusted, and a pitch, a number of turns, and a line length of the resonance point adjusting coil are adjusted in accordance with the mounting angle to adjust the antenna portion to a desired impedance.
Effects of the invention
According to the present invention, in the antenna device, the impedance of the antenna unit can be adjusted by changing the attachment angle of the resonance point adjusting coil of the antenna unit without depending on the integrated circuit, and the impedance can be adjusted even on the antenna unit side, so that the loss of integration with the amplifier of the reception efficiency can be reduced.
Drawings
Fig. 1 is an external perspective view of an antenna device according to an embodiment of the present invention.
Fig. 2 is a sectional view of an antenna device according to an embodiment of the present invention.
Fig. 3 is a perspective view of an antenna device according to an embodiment of the present invention, showing a state in which an antenna cover is removed.
Fig. 4 is a perspective view of the antenna device according to the embodiment of the present invention, viewed from a direction different from that of fig. 3, and shows a state in which the antenna cover is detached.
Fig. 5 is an exploded perspective view of an antenna device according to an embodiment of the present invention.
Fig. 6 is a smith chart of the antenna device shown in fig. 1-4.
Fig. 7(a) is a cross-sectional view of an antenna device of a conventional example, and fig. 7(b) is a smith chart of the antenna device.
Fig. 8(a) is a cross-sectional view of the antenna device at another coil mounting angle, and fig. 8(b) is a smith chart of the antenna device according to the embodiment of the present invention. Fig. 8(a) shows a state where the radome is removed.
Fig. 9(a) is a cross-sectional view of the antenna device at another coil mounting angle, and fig. 9(b) is a smith chart of the antenna device according to the embodiment of the present invention. Fig. 9(a) shows a state where the antenna cover is removed.
Fig. 10(a) is a cross-sectional view of the antenna device at another coil mounting angle, and fig. 10(b) is a smith chart of the antenna device according to the embodiment of the present invention. Fig. 10(a) shows a state where the antenna cover is removed.
Fig. 11(a) is a cross-sectional view of the antenna device at another coil mounting angle, and fig. 11(b) is a smith chart of the antenna device according to the embodiment of the present invention. Fig. 11(a) shows a state where the antenna cover is removed.
In the figure:
1-antenna device, 10-antenna part, 11-metal plate, 12-coil for resonance point adjustment, 20-amplifier substrate, 21-connection terminal, 30-antenna holder, 31-metal plate holder, 32-coil holder, 40-antenna base, 50-antenna cover, 60-spacer.
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following is an embodiment of the present invention, and is not intended to limit the present invention.
The antenna device 1 of the present embodiment is an antenna device capable of receiving radio waves in a frequency band for AM/FM broadcasting, and is an example of an in-vehicle antenna device fixedly installed on an installation surface located on a roof of a vehicle.
As shown in fig. 1 to 5, the antenna device 1 includes an antenna unit 10, an amplifier substrate 20, an antenna holder 30, an antenna base 40, an antenna cover 50, and a spacer 60, and includes, as other components, a hook 71, a cable holder 72, and bolts. In the figure, the axis X represents the left-right direction, the axis Y represents the front-rear direction, and the axis Z represents the up-down direction. The antenna device 1 is configured such that the protruding height from the installation surface is 70mm or less.
The antenna unit 10 includes a metal plate 11 and a resonance point adjusting coil 12 having one end connected to the metal plate 11.
The radome 50 is formed in a shark fin shape that is higher toward the rear.
The metal plate 11 has an upper surface portion 111, a left side wall portion 112, a right side wall portion 113, a tie bar 114, a coil connection hole 115, and fixing holes 116, 116.
The upper surface portion 111 is formed long in the front-rear direction along the upper edge of the radome 50.
The left side wall portion 112 extends obliquely downward from the left edge of the upper surface portion 111 along the left surface of the antenna cover 50.
Right side wall portion 113 extends obliquely downward from the right edge of upper surface portion 111 along the right surface of antenna cover 50.
The connecting rod 114 extends downward from the front edge of the upper surface portion 111. The connection bar 114 is inserted into the connection terminal 21 mounted on the amplifier board 20, and connects the antenna unit 10 to the amplifier board 20. Thus, the resonance point adjusting coil 12 is connected to the input of the amplifier board 20 via the metal plate 11. The connection terminal 21 is constituted by a pair of spring terminals that are pressed by sandwiching the tie bar 114, and can be easily connected only by inserting the tie bar 114.
The coil connection hole 115 is a hole provided through the rear end portion of the upper surface portion 111. One end of the coil 12 for adjusting the resonance point is soldered to the coil connection hole 115 after being inserted. Thus, one end of the resonance point adjusting coil 12 is connected to the metal plate 11, and the other end is open (open).
In addition, fixing holes 116, 116 are provided through the upper surface 111.
The amplifier board 20 is a circuit board having an amplifier for amplifying the AM/FM broadcast signal received by the antenna unit 10. The amplifier substrate 20 is fixed to the upper surface of the antenna base 40. In the present embodiment, the amplifier board 20 is disposed near the front end, but may be disposed freely at the center in the front-rear direction, near the rear end, or the like, and this freedom is allowed by the disposition of the connection terminals 21 and the bending and extending arrangement of the connection bars 114.
The antenna holder 30 is an insulator for holding the antenna unit 10, and is provided upright on the antenna base 40, and the antenna holder 30 has female threads formed on the upper surface of the metal plate holding block 31, and the metal plate 11 is fixed to the antenna holder 30 by bolts inserted through the fixing holes 116, 116 as shown in the drawing.
Further, in the antenna holder 30, a coil holding block 32 for holding the resonance point adjusting coil 12 is formed so as to protrude rearward from the rear end portion of the metal plate holding block 31. The coil holding block 32 is formed in accordance with the arrangement of the resonance point adjusting coil 12.
The mounting angle of the resonance point adjusting coil 12 shown in fig. 1 to 5 is as follows. That is, when the direction from the connection side of the coil 12 with the metal plate 11 to the opposite side of the coil 12 along the central axis of the coil 12 for resonance point adjustment is the vertical downward direction, the mounting angle of the coil 12 for resonance point adjustment is 0 ° and is 0 °.
From the position of the attachment angle 0 °, the rear side is set to positive, fig. 8(a) is the attachment angle 270 °, fig. 9(a) is the attachment angle 180 °, fig. 10(a) is the attachment angle 90 °, and fig. 11(a) is the attachment angle 270 °. The structure of fig. 8(a) is different from the structure of fig. 11(a) in that the resonance point adjusting coil 12 is disposed below the metal plate 11 in fig. 8(a), and the resonance point adjusting coil 12 is disposed above the metal plate 11 in fig. 11 (a). Although not shown in fig. 8 to 11, the coil holding block 32 is formed in accordance with the arrangement of the resonance point adjusting coil 12 (the entire antenna holder 30 and the antenna cover 50 are formed in accordance with need).
Further, the metal plate 11 and the resonance point adjusting coil 12 may be appropriately modified so as to be held by the antenna cover 50. When both the metal plate 11 and the resonance point adjusting coil 12 are held by the antenna cover 50, the antenna holder 30 shown in the drawing disposed inside the antenna cover is not necessary.
The antenna base 40 is provided with a cable insertion hole, a protrusion, and the like to the vehicle interior, and the antenna base 40 is fixed to a mounting surface via a spacer 60. The lower end of the antenna cover 50 is fixed to the outer edge portion of the antenna base 40, and the antenna unit 10, the amplifier substrate 20, the antenna holder 30, and the like are housed in the interior surrounded by the antenna base 40 and the antenna cover 50.
Fig. 7(a) shows a comparative mode of an antenna device of a conventional example in which one end of a coil 102 is connected to an amplifier substrate 101 and the other end of the coil 102 is connected to a capacitor ring 103.
Experiments were conducted on the mode of the invention shown in fig. 1 to 4, the mode for comparison shown in fig. 7(a), the mode of the invention shown in fig. 8(a), the mode of the invention shown in fig. 9(a), the mode of the invention shown in fig. 10(a), and the mode of the invention shown in fig. 11(a), and smith charts were created as shown in fig. 6, 7(b), 8(b), 9(b), 10(b), and 11(b), respectively, in this order. As can be seen by comparing the comparison pattern of fig. 7(b) with fig. 6, 9(b), 10(b), etc., the present invention pattern facilitates impedance matching with respect to the comparison pattern.
As is apparent from fig. 6, 8(b), 9(b), 10(b), and 11(b) relating to the present invention mode, the antenna device 1 has a characteristic that the impedance of the antenna unit 10 can be adjusted by the installation angle of the resonance point adjusting coil 12.
In the comparison mode shown in fig. 7(a), the impedance of the antenna is strongly distributed by the capacitor ring 103 on the tip side rather than by the coil 102, and the impedance cannot be adjusted without changing the installation angle of the capacitor ring 103, but the installation angle is difficult to change because the capacitor ring 103 is large in size. In contrast, according to the antenna device 1 of the present embodiment, the impedance of the antenna is strongly dominated by the resonance point adjusting coil 12 on the distal end side rather than by the metal plate 11, and the impedance can be adjusted by changing the attachment angle of the resonance point adjusting coil 12 to be relatively small.
Without being limited to the illustrated example, the mounting angle of the resonance point adjusting coil 12 may be selected between 0 ° and 90 °, between 90 ° and 180 °, between 180 ° and 270 °, and between 270 ° and 360 °, thereby performing fine adjustment.
As a method of manufacturing the antenna device 1, the mounting angle of the resonance point adjusting coil 12 is adjusted, and the pitch, the number of turns, and the line length of the resonance point adjusting coil 12 are adjusted in accordance with the mounting angle, thereby adjusting the antenna portion 10 to a desired impedance.
When the arrangement and the specification of the coil 12 for resonance point adjustment are determined, the antenna holder 30, the antenna cover 50, and the like are manufactured in cooperation therewith, and the whole is assembled.
According to the antenna device 1 of the present embodiment described above, the impedance of the antenna unit 10 can be adjusted by changing the attachment angle of the resonance point adjusting coil 12 of the antenna unit 10 without depending on the integrated circuit.
Conventionally, the input impedance on the amplifier side is adjusted by an integrated circuit configured by combining a resistor, a capacitor, and an inductor, and the impedance is integrated with the impedance on the antenna side, but according to the antenna device 1 of the present embodiment, the impedance can be adjusted even on the antenna portion 10 side, so that the adjustment range can be expanded, the loss of integration with the amplifier of the reception efficiency can be reduced, and high reception sensitivity can be realized.
Further, according to the antenna device 1 of the present embodiment, it is not necessary to provide an integrated circuit including a resistor, a capacitor, and an inductor on the amplifier substrate side, and it is possible to reduce the number of components and the cost thereof.
According to the antenna device 1 of the present embodiment, the amplifier substrate 20, the metal plate 11, and the coil 12 are connected in this order, and thus impedance can be increased compared to the conventional technique in which the amplifier substrate, the coil, and the capacitor ring are connected in this order as shown in fig. 7 (a). In addition, according to the antenna device 1 of the present embodiment, since one end of the resonance point adjusting coil 12 and the metal plate 11 are soldered and the tie bar 114 of the metal plate 11 is inserted into the connection terminal 21, the assembly is easy compared to the conventional art.
In the above embodiment, AM/FM is exemplified, but by changing the size of the metal plate 11 and changing the location of the amplifier substrate 20, it is possible to compound patch antennas such as SXM antennas and GNSS antennas, substrates called DAB and TEL, and monopole antennas.
The antenna device of the present invention is not limited to the ceiling-mount type called shark fin antenna as in the above embodiments, and may be disposed in a spoiler, an outside mirror, an instrument panel, or the like.
The amplifier board 20 and the metal plate 11 may be connected to each other by direct power supply without passing through a connection terminal.
The resonance point adjusting coil is not limited to the spiral type, and may be implemented in other forms such as a zigzag, a serpentine, and a loop.
Claims (7)
1. An antenna device mounted on a vehicle, comprising:
an antenna section; and
an amplifier substrate having an amplifier for amplifying a signal received by the antenna unit,
the antenna part comprises a metal plate and a coil for adjusting resonance point with one end connected to the metal plate,
one end of the resonance point adjusting coil is connected to an input of the amplifier substrate via the metal plate.
2. The antenna device of claim 1,
the other end of the resonance point adjusting coil is open.
3. The antenna device of claim 1,
the impedance of the antenna unit can be adjusted by the installation angle of the resonance point adjusting coil.
4. The antenna device according to claim 2,
the impedance of the antenna unit can be adjusted by the installation angle of the resonance point adjusting coil.
5. The antenna device according to any of claims 1 to 4,
a direction from a connection side of the resonance point adjusting coil with the metal plate toward an opposite side of the coil along a central axis of the resonance point adjusting coil is a vertical downward direction.
6. The antenna device according to any of claims 1 to 4,
when a direction from a connection side of the resonance point adjusting coil with the metal plate toward an opposite side of the resonance point adjusting coil is a vertical downward direction along a central axis of the resonance point adjusting coil, an installation angle of the resonance point adjusting coil is set to 0 ° and an installation angle of 90 ° is set.
7. A method for manufacturing an antenna device according to any one of claims 1 to 6,
the mounting angle of the resonance point adjusting coil is adjusted, and the pitch, the number of turns, and the line length of the resonance point adjusting coil are adjusted in accordance with the mounting angle, thereby adjusting the antenna portion to a desired impedance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811058340.4A CN110890634A (en) | 2018-09-11 | 2018-09-11 | Antenna device and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811058340.4A CN110890634A (en) | 2018-09-11 | 2018-09-11 | Antenna device and method for manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110890634A true CN110890634A (en) | 2020-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811058340.4A Pending CN110890634A (en) | 2018-09-11 | 2018-09-11 | Antenna device and method for manufacturing the same |
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| Country | Link |
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| CN (1) | CN110890634A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000138514A (en) * | 1998-10-29 | 2000-05-16 | Hideo Suyama | Built-in antenna device |
| JP2007228456A (en) * | 2006-02-27 | 2007-09-06 | Clarion Co Ltd | Combined antenna |
| WO2011004636A1 (en) * | 2009-07-06 | 2011-01-13 | 日本アンテナ株式会社 | Whip antenna |
| US20140002319A1 (en) * | 2011-03-15 | 2014-01-02 | Stefan Lindenmeier | Multiband reception antenna for the combined reception of satellite signals and terrestrially emitted radio signals |
| US20140340267A1 (en) * | 2013-05-20 | 2014-11-20 | Hyundai Motor Company | Antenna for vehicle |
| CN105742780A (en) * | 2016-04-25 | 2016-07-06 | 东莞思谷数字技术有限公司 | Radio frequency identification (RFID) flexible bending type adjustable antenna |
| CN205863396U (en) * | 2016-06-08 | 2017-01-04 | 湖北省特力讯电子科技有限公司 | Shark fins antenna assembly |
-
2018
- 2018-09-11 CN CN201811058340.4A patent/CN110890634A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000138514A (en) * | 1998-10-29 | 2000-05-16 | Hideo Suyama | Built-in antenna device |
| JP2007228456A (en) * | 2006-02-27 | 2007-09-06 | Clarion Co Ltd | Combined antenna |
| WO2011004636A1 (en) * | 2009-07-06 | 2011-01-13 | 日本アンテナ株式会社 | Whip antenna |
| US20140002319A1 (en) * | 2011-03-15 | 2014-01-02 | Stefan Lindenmeier | Multiband reception antenna for the combined reception of satellite signals and terrestrially emitted radio signals |
| US20140340267A1 (en) * | 2013-05-20 | 2014-11-20 | Hyundai Motor Company | Antenna for vehicle |
| CN105742780A (en) * | 2016-04-25 | 2016-07-06 | 东莞思谷数字技术有限公司 | Radio frequency identification (RFID) flexible bending type adjustable antenna |
| CN205863396U (en) * | 2016-06-08 | 2017-01-04 | 湖北省特力讯电子科技有限公司 | Shark fins antenna assembly |
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