KR20150062087A - Antenna device for vehicle - Google Patents

Abstract

An invention related to a vehicular antenna device is disclosed. The disclosed antenna device for a vehicle includes a circuit member mounted on a vehicle body, the circuit member having a feed part and a ground part, an antenna support part protruding from one side of the circuit member, a meander type antenna formed on one surface of the antenna support part, And a second antenna unit formed on the other surface of the antenna supporting unit and radiating a signal generated by coupling with the first antenna unit.

Description

TECHNICAL FIELD [0001] The present invention relates to an antenna device for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a vehicle, and more particularly to an antenna device for a vehicle that transmits and receives signals used in a media device of a vehicle.

An antenna device for a vehicle is a device for transmitting and receiving various signals required in multimedia devices such as an AM / FM radio and a DMB (Digital Multimedia Broadcasting) installed in a vehicle.

BACKGROUND ART [0002] In general, an automotive antenna apparatus is mounted on the outside of a vehicle to improve the transmission / reception ratio of an electrical signal. 2. Description of the Related Art [0002] In recent years, various shapes of antenna devices have been applied in consideration of the appearance of a vehicle and noise during high-speed traveling. Especially, shark fin-shaped antennas having a small air resistance and good appearance have been used.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2010-1005171 (published on Oct. 27, 2010, entitled Integrated antenna for vehicle and method of manufacturing the same).

Since the conventional shark fin antenna is mounted on the outside of the vehicle and is small in consideration of appearance quality and noise generation, the space in which the transmitting and receiving section is accommodated is narrow. Therefore, there is a problem that the radiation efficiency is poor due to signal interference between the antennas receiving a plurality of signals and the length limitation of the transmitting and receiving part.

Therefore, there is a need for improvement.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular antenna device capable of improving the transmission / reception ratio of an antenna within a limited space.

A vehicular antenna device according to the present invention includes: a circuit member mounted on a vehicle body, the circuit member having a feed part and a ground part; An antenna support protruding from the circuit member; A first antenna unit formed on one surface of the antenna support unit and being connected to the circuit member; And a second antenna unit formed on the other surface of the antenna support unit and radiating a signal generated by coupling with the first antenna unit.

In the present invention, the first antenna unit may include a feed connection unit having one end connected to the feed unit and formed in a meander type conductive pattern; And a ground connection part which connects the other end of the power supply connection part and the ground part and is formed in a meander type conductive pattern.

In the present invention, the pair of ground connection parts are symmetrically disposed on both sides of the power supply connection part.

In the present invention, the second antenna part may include a coupling part formed in a meander type conductive pattern on the other surface of the antenna supporting part and coupled to the first antenna part; And a helical radiator connected to the coupling coupling part and protruding from the antenna supporting part.

In the vehicular antenna device according to the present invention, since the first antenna portion and the second antenna portion are each formed in a meander type conductive pattern, a length for receiving an electrical signal can be secured even in a narrow space.

Therefore, the present invention has a good transmission / reception ratio of an electric signal even in a narrow space and can be mounted in a narrow space like the inside of a shark fin-shaped housing part.

Also, in the present embodiment, the (+) signal line and the (-) ground are implemented in the meander line in the vehicular antenna device, and the influence of the external ground can be reduced with a configuration similar to the Diapole type antenna.

1 is a perspective view of an antenna device for a vehicle according to an embodiment of the present invention.
2 is a perspective view illustrating a state in which a vehicular antenna device according to an embodiment of the present invention is housed in a housing part.
3 is a perspective view illustrating a base unit and a first antenna unit according to an embodiment of the present invention.
4 is a view illustrating a first antenna unit according to an embodiment of the present invention.
5 is a view illustrating a second antenna unit according to an embodiment of the present invention.
FIG. 6 is a graph showing a result of measurement of reflection loss of an antenna device for a vehicle according to an embodiment of the present invention.

Hereinafter, an embodiment of a vehicular antenna device according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a perspective view of an antenna device for a vehicle according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating a state in which a vehicle antenna device according to an embodiment of the present invention is housed in a housing part, 1 is a perspective view illustrating a base unit and a first antenna unit according to an embodiment.

1 to 3, a vehicular antenna device 1 according to an embodiment of the present invention includes a circuit member 100, an antenna support unit 200, a first antenna unit 300, and a second antenna unit 400 ).

The circuit member 100 is mounted on the vehicle body, and the feeding part 110 and the grounding parts 151 and 155 are formed. The circuit member 100 is bolted to the base portion 50 coupled to the vehicle body and accommodated in a space between the housing portion 10 and the base portion 50 in a shape covering the base portion 50 .

The circuit member 100 is wired or wirelessly connected to a media device such as navigation, digital multimedia broadcasting (DMB), or radio mounted on a vehicle body, and processes a signal transmitted / received through an antenna. The details of the circuit member 100 to convert an electrical signal into a signal required by the media device are obvious to those of ordinary skill in the art, and a detailed description thereof will be omitted.

The power feeder 110 is electrically connected to the circuit member 100 and the first antenna unit 300 by soldering or the like so that the electrical signal is transmitted to the first antenna unit 300, So that a signal is input from the unit 300 to the circuit member 100.

The grounding units 151 and 155 are terminals for grounding the first antenna unit 300 or the second antenna unit 400. In this embodiment, the grounding units 151 and 155 are connected to the vehicle body or the like and include a first grounding unit 151 connected to the first antenna unit 300 and a second grounding unit 151 connected to the second antenna unit 400 155).

The antenna supporting part 200 is protruded to one side from the circuit member 100. In this embodiment, the antenna supporting part 200 includes a synthetic resin material and is bonded to the circuit member 100 by bonding, bolting, or the like.

4 is a view illustrating a first antenna unit according to an embodiment of the present invention.

Referring to FIG. 4, the first antenna unit 300 is meander type and is electrically connected to the circuit member 100 on one side of the antenna support unit 200. In this embodiment, the first antenna unit 300 includes a power supply connection unit 310 and a ground connection unit 350.

One end of the power feeding connection part 310 is connected to the feed part 110 by soldering or the like and a conductive pattern is formed on one surface of the antenna supporting part 200 to have a length of a conductive pattern for transmitting and receiving an electric signal .

The grounding connection part 350 connects the other end of the power supply connection part 310 and the first grounding part 151 and is formed in a meander type conductive pattern so as to maximize the length of the conductive pattern together with the power supply connection part 310. [ do.

In the present embodiment, the sum of the lengths of the conductive patterns of the feed connection 310 and the ground connection 350 corresponds to 1/4 of the wavelength of an electrical signal to be transmitted / received. For example, when an FM radio signal having a frequency band of 88 MHz to 108 MHz is transmitted and received, the total length of the power supply connection portion 310 and the ground connection portion 350 corresponds to approximately 70 to 85 cm, which is 1/4 of the wavelength.

In this embodiment, the pair of ground connection parts 350 are symmetrically formed on both sides of the power supply connection part 310, and they are coupled and coupled to each other to improve the transmission / reception efficiency.

5 is a view illustrating a second antenna unit according to an embodiment of the present invention.

Referring to FIG. 5, the second antenna unit 400 is formed on the other surface of the antenna support unit 200 and radiates a signal generated by coupling with the first antenna unit 300. In this embodiment, the second antenna unit 400 includes a coupling coupling unit 410 and a helical radiator 450.

The coupling part 410 is formed in a meander type conductive pattern on the other surface of the antenna supporting part 200 and connected to the second ground part 155 and couples to the first antenna part 300.

The helical radiator 450 is connected to the coupling coupling part 410 by soldering or the like, and protrudes forward from the antenna supporting part 200 of the vehicle. In this embodiment, the sum of the lengths of the coupling coupling part 410 and the helical radiator 450 corresponds to 1/2 of the wavelength of a signal to be transmitted and received, and corresponds to 140 to 170 cm based on the FM radio frequency.

Hereinafter, the operation principle of the antenna device 1 for a vehicle according to one embodiment of the present invention will be described.

A signal input to the feeder 110 from the circuit member 100 is transmitted to the ground connection unit 350 via the power supply connection unit 310. [ The power supply connection part 310 and the ground connection part 350 are conductive patterns formed in a meander type, and the sum of the lengths corresponds to 1/4 of the wavelength of a signal to be transmitted.

An electrical signal transmitted to the ground connection unit 350 through the first antenna unit 300 or the power supply connection unit 310 is transmitted to the second antenna unit 400 coupled to the first antenna unit 300.

The signal input to the first antenna unit 300 is transmitted to the second antenna unit 400 coupled to the first antenna unit 300. The sum of the lengths of the second antenna unit 400, i.e., the coupling coupling unit 410 and the helical radiator 450 corresponds to 1/2 of the wavelength of the electrical signal. The signal input to the second antenna unit 400 is radiated through the coupling coupling unit 410 and the helical radiator 450.

Conversely, a signal transmitted from a broadcasting station or the like is input to the second antenna unit 400 and transmitted to the first antenna unit 300 coupling-coupled to the second antenna unit 400.

The signal transmitted to the first antenna unit 300 is transmitted to the circuit member 100 through the feeder 110 and the circuit member 100 processes the received signal and transmits the signal to the media device.

FIG. 6 is a graph showing a result of measurement of reflection loss of an antenna device for a vehicle according to an embodiment of the present invention.

6A is data obtained by measuring the return loss of the reduced built-in monopole antenna, and FIG. 6B is data obtained by measuring the return loss of the vehicular antenna device 1 in the present embodiment. Here, the return loss corresponds to a value obtained by converting the reflection coefficient to a log scale (dB), and the reflection coefficient corresponds to the ratio of the reflection amount to the input amount.

The inventions of both inventions measure the reflection loss with respect to the frequency of the FM band, and the larger the reflection loss value, the smaller the loss of the signal. Normally, the usefulness reference value of the antenna corresponds to a return loss of 10 dB.

In the present embodiment, the reflection loss value of the vehicular antenna device 1 corresponds to 21 dB (-21 dB in the case of the S parameter S11) (refer to FIG. 6 (b) (-3.4 dB in the case of (S11) of the S parameter), which is a return loss value of the built-in monopole antenna reduced in size, and (Fig. 6 The signal loss is small.

As described above, in the present embodiment, since the first antenna unit 300 and the second antenna unit 400 are formed in a conductive pattern of a meander type, respectively, the antenna apparatus 1 for a vehicle can receive an electrical signal even in a narrow space. A sufficient length can be ensured.

Accordingly, in the present embodiment, the vehicular antenna device 1 has a good transmission / reception ratio of the electric signal and can be accommodated in the shank-finned housing portion 10.

Also, in the present embodiment, the vehicle antenna device 1 has a structure similar to a diapole type antenna in which (+) signal line and (-) ground are implemented as meander lines, and the influence of the external ground can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

Accordingly, the true scope of the present invention should be determined by the following claims.

1: vehicle antenna device 10: housing part
50: base portion 100: circuit member
[0001] The present invention relates to an antenna, and more particularly,
350: ground connection part 400: second antenna part
410: coupling coupling part 450: helical radiator

Claims (4)

A circuit member mounted on a vehicle body and having a feed part and a ground part;
An antenna support protruding from the circuit member;
A first antenna unit formed on one surface of the antenna support unit and being connected to the circuit member; And
A second antenna unit formed on the other surface of the antenna support unit and radiating a signal generated by being coupled with the first antenna unit;
And an antenna unit for receiving the antenna.
The method according to claim 1,
The first antenna unit includes:
A feed connection part having one end connected to the feed part and formed in a meander type conductive pattern; And
A ground connection part connecting the other end of the power supply connection part to the ground part and formed in a meander type conductive pattern;
And an antenna unit for receiving the antenna.
3. The method of claim 2,
The ground connection portion includes:
And a pair of symmetrically disposed pairs of the feed connection portions are disposed on both sides of the feed connection portion.
4. The method according to any one of claims 1 to 3,
The second antenna unit includes:
A coupling part formed in a meander type conductive pattern on the other surface of the antenna supporting part and coupled with the first antenna part; And
A helical radiator connected to the coupling portion and protruding from the antenna support portion;
And an antenna unit for receiving the antenna.

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