KR102155164B1 - Internal antenna device for vehicle - Google Patents

Abstract

Disclosed is a technology related to a vehicle internal antenna device.
An internal antenna device for a vehicle according to an embodiment of the present invention includes: a patch antenna unit installed at a neck of a rearview mirror having one end fixed inside the vehicle and the other end coupled to the rearview mirror to radiate a signal to the front glass side of the vehicle; And a conductive film part installed on the front glass with a predetermined distance from the patch antenna part to compensate for the radiation signal radiated from the patch antenna part,
It is possible to compensate for signal loss of a vehicle internal antenna, improve radiation efficiency and antenna performance, and substantially generate and change the directivity of the internal antenna.

Description

Internal antenna device for vehicle {Internal antenna device for vehicle}

The present invention relates to a vehicle internal antenna device, and more particularly, to a vehicle internal antenna device that improves radiation efficiency and antenna performance by compensating for signal loss of the vehicle internal antenna.

In general, a vehicle antenna refers to various types of antennas mounted inside and outside a vehicle for communication between wireless communication devices used in the vehicle. Recently, as wireless communication devices used in vehicles such as AM/FM radio, Digital Multimedia Broadcast (DMB) receiver, GPS (Global Positioning System), and vehicle mobile communication devices have been diversified, interest and research in vehicle antenna technology Development is increasing rapidly.

The vehicle antenna may be classified into an external antenna installed on an exterior panel of a vehicle and an internal antenna installed inside the vehicle according to an installation location. Among these, in the case of the built-in antenna, a large amount of loss occurs in the transmission and reception signals due to the influence of the metal structures constituting the vehicle body. In particular, in the case of a 5.8GHz band V2X (Vehicle to Everything) signal using a high frequency band signal, signal loss may occur up to 40%. Therefore, in the case of the built-in antenna, it is necessary to have an appropriate means to compensate for signal loss in order to improve the radiation efficiency and antenna performance, and unlike an external antenna in which omnidirectional is important, it is rather necessary to have a certain directivity. There is.

However, as disclosed in Korean Patent Application Laid-Open No. 10-2000-0038062 or the like, the existing technologies have a problem in that they do not provide a means for compensating the signal loss of the built-in antenna in a simple and efficient manner. In addition, in the existing technology, when an internal antenna is installed in the main body of the room mirror, the angle of the antenna is also changed when the angle of the room mirror is adjusted, resulting in a problem of changing the antenna performance.

In addition, as disclosed in Korean Patent Laid-Open Publication No. 10-2003-0040059, the existing technologies have a problem in that manufacturing and installation processes are complicated and production efficiency is low by applying a complex configuration to maintain an antenna angle.

The technical problem to be solved by the present invention is to improve radiation efficiency and antenna performance by compensating for signal loss of an internal antenna for a vehicle, and to substantially generate and change the directivity of the internal antenna, as well as reduce manufacturing and installation costs. It is to provide a vehicle built-in antenna device that reduces the cost.

In order to solve the above technical problem, the internal antenna device for a vehicle according to an embodiment of the present invention is installed in the neck of a rearview mirror, in which one end is fixed inside the vehicle and the other end is coupled to the rearview mirror. A patch antenna unit for emitting a signal; And a conductive film part installed on the front glass with a predetermined distance from the patch antenna part to compensate for a radiation signal radiated from the patch antenna part.

In an embodiment, the patch antenna unit includes: a dielectric substrate having a predetermined feed hole; A patch-type radiator disposed on an upper surface of the dielectric substrate; And a feeding pin for feeding power to the patch-type radiator through the feeding hole.

In an embodiment, the patch antenna unit and the conductive film unit may be installed at a distance from each other to generate constructive interference between a radiation signal of the patch antenna unit and a reflected signal reflected by the conductive film unit.

In one embodiment, the patch antenna unit and the conductive film unit may be installed with a separation distance corresponding to an odd multiple of a half-wavelength distance of the radiation signal.

In one embodiment, the conductive film part may be formed of an ITO film (Indium-Tin Oxide film).

In order to solve the above technical problem, a vehicle internal antenna device according to another embodiment of the present invention has an opening formed at one end and an interior receiving space connected to the opening, and the one end is a front glass of the vehicle. A room mirror neck portion fixed to and coupled to the other end of the room mirror; A patch antenna unit received and installed in the interior receiving space of the rearview mirror neck unit and radiating a signal toward the front glass through the opening; And a conductive film part installed on the front glass with a predetermined distance from the patch antenna part to compensate for a radiation signal radiated from the patch antenna part.

In one embodiment, the conductive film part may be installed on one surface of the front glass corresponding to the opening of the rearview mirror neck part.

According to the present invention, by installing the antenna device inside the vehicle, particularly in the neck portion of the rearview mirror structure, it is possible to prevent damage to the vehicle's intrinsic aesthetics and exterior panels, and maintain the angle of the antenna even when the angle of the rearview mirror is changed.

In particular, by compensating the antenna radiation signal using a conductive film, signal loss due to the dielectric constant of the vehicle glass can be minimized, radiation efficiency and antenna performance can be improved, as well as substantially generating and changing the directivity of the antenna device. It can have an effect.

Furthermore, those of ordinary skill in the art to which the present invention pertains will clearly understand from the following description that various embodiments according to the present invention can solve various technical problems not mentioned above.

1 is a perspective view showing a vehicle internal antenna device according to an embodiment of the present invention.
Figure 2 is a side view showing a vehicle internal antenna device according to an embodiment of the present invention.
3A is a perspective view showing an example of a patch antenna unit.
3B is an exploded perspective view showing an example of a patch antenna unit.
4A to 4C are diagrams illustrating a method of adjusting a radiation pattern of a vehicle internal antenna device according to the present invention.
5 is a vertical cross-sectional view showing a vehicle internal antenna device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to clarify a solution to the technical problem of the present invention. However, in describing the present invention, if the description of the related known technology rather obscure the subject matter of the present invention, a description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, and these may vary according to the intention or custom of the practitioner. Therefore, the definition should be made based on the contents throughout this specification.

1 is a perspective view showing a vehicle internal antenna device according to an embodiment of the present invention.

As shown in FIG. 1, the internal antenna device 100 for a vehicle according to an embodiment of the present invention is related to the rearview mirror structure 110 of the vehicle, and the patch antenna unit 120 and the conductive film unit 130 Includes.

The patch antenna unit 120 is installed on the room mirror neck portion 112 of the room mirror structure 110. The rear-view mirror neck part 112 is a kind of neck part in which one end is fixed to the interior of the vehicle, for example, the front glass 10 and the other end is coupled to the rear-view mirror 114. In this case, the room mirror 114 may be coupled to the room mirror neck portion 112 so as to rotate within a predetermined range.

The conductive film part 130 is a film-like member having conductivity and is installed on the front glass 10 with a predetermined distance from the patch antenna part 120 to compensate for the radiation signal radiated from the patch antenna part 120 .

2 is a side view showing a vehicle internal antenna device according to an embodiment of the present invention.

As shown in FIG. 2, the patch antenna unit 120 is installed on the vehicle front outer peripheral surface 115 of the rearview mirror neck 112, and radiates a signal toward the front glass 10 of the vehicle. In this case, the patch antenna unit 120 may emit various signals such as an AM/FM radio signal, a 3G signal, a Long Term Evolution (LTE) signal, and a Vehicle to Everything (V2X) signal, according to an embodiment, and in particular, 5.8 It can emit V2X signals in the GHz band.

3A and 3B illustrate an example of a patch antenna unit in perspective and exploded perspective views, respectively.

As shown in FIGS. 3A and 3B, the patch antenna unit 120 includes a dielectric substrate 124 on which a ground portion 122 in the form of a metal thin film is disposed on a bottom surface, a patch type radiator 126, and a power supply pin 128. ) Can be included.

The dielectric substrate 124 is a ceramic material, polycarbonate (PC: Polycarbonate), polyamide (PA: Polyamide), polyacetal (POM: Polyacetal, polyoxymethylene (POM: Poly Oxy Methylene)), polyethylene terephthalate (PET: Polyethylene terephthalate), ABS (Acrylonitrile-Butadiene-Styrene), etc. In this case, the dielectric substrate 124 may vary in size or thickness according to the dielectric constant of the constituent material. .

The patch-type radiator 126 is disposed on the upper surface of the dielectric substrate 124. The size and shape of the patch-type radiator 126 may be determined according to the frequency band of the transmission/reception signal, and various modifications are possible. In the patch antenna unit 120, major radiation is performed through a fringing field generated at an edge portion of the patch-type radiator 126.

The feeding pin 128 performs feeding to the patch-type radiator 126. To this end, as shown in FIG. 3B, the ground part 122, the dielectric substrate 124, and the patch-type radiator 126 may include feed holes 123, 125, and 127, respectively. That is, the power supply pin 128 electrically connects a predetermined power supply circuit (not shown) and the patch-type radiator 126 through the feeding holes 123, 125, and 127 to power the patch-type radiator 126.

Referring to FIG. 2 again, the conductive film unit 130 is placed on the front glass 10 with a predetermined distance D from the patch antenna unit 120 to compensate for the radiation signal radiated from the patch antenna unit 120. Installed. In this case, the patch antenna unit 120 and the conductive film unit 130 have a separation distance (D) at which constructive interference occurs between the radiation signal of the patch antenna unit 120 and the reflected signal reflected by the conductive film unit 130. ) Can be installed. For example, the patch antenna unit 120 and the conductive film unit 130 are an odd multiple of the separation distance or half wavelength distance (λ/2) corresponding to the half wavelength distance (λ/2) of the radiation signal as shown in Equation 1 It can be installed with a separation distance corresponding to.

[Equation 1]

In Equation 1, D is a separation distance between the patch antenna unit 120 and the conductive film unit 130, λ is the wavelength of the radiation signal of the patch antenna unit 120, and n is a natural number. That is, signal reflection by the conductive film unit 130 may be viewed as a fixed end reflection, and in the case of a fixed end reflection, constructive interference may occur when a phase difference corresponding to an odd multiple of a half wavelength occurs.

For example, in the case of a V2X signal in the 5.8GHz band, since the center frequency is 5.8GHz, λ = c/f = (3*10^8)/(5.8*10^9) = 51.7[mm]. Here, c is the speed of light and f is the center frequency. Therefore, the half-wavelength distance (λ/2) of the V2X signal is approximately 2.585 [cm].

In this way, the conductive film unit 130 may compensate for signal loss caused by the windshield 10 by causing constructive interference between the signal radiated by the patch antenna unit 120 and the reflected signal. .

On the other hand, the conductive film unit 130 may be made of a transparent material so as not to interfere with the driver's view while having conductivity. For example, the conductive film unit 130 may be formed of an ITO film (Indium-Tin Oxide film). The ITO film, also referred to as a phosphorus-tin oxide film, is a film having conductivity and transparency. ITO is made by adding tin oxide (SnO2) to indium oxide (In2O3) having conductivity to further increase the conductivity, and it is possible to obtain a conductive transparent film by coating this ITO on a film such as polyethylene. The size of the conductive film part 130 may be set to 1.1 to 1.2 times the size of the patch antenna part 120. That is, the conductive film unit 130 may be set to be larger than the patch antenna unit 120 in consideration that a signal radiated from the patch antenna unit 120 is partially lost in the air, and the size and shape thereof can be variously modified. It is possible.

4A to 4C illustrate a method of adjusting a radiation pattern of an internal antenna device for a vehicle according to the present invention.

As shown in FIG. 4A, when the conductive film part 130 is installed parallel to the front of the patch antenna part 120, a signal in the direction A is compensated for in the radiation signal of the patch antenna part 120, The effect of generating the directivity of

In addition, as shown in FIGS. 4B and 4C, when the conductive film part 130 is changed from the front side of the patch antenna part 120 to the left or right side and disposed, each of the radiation signals of the patch antenna part 120 The signal in the B or C direction is compensated, and the effect of generating directivity in the B or C direction occurs. In addition, if the angle between the surface of the conductive film unit 130 and the surface of the radiator of the patch antenna unit 520 is modified to be 45 degrees, it may contribute to making the polarization of the patch antenna unit 520 into a circular polarization. .

5 is a vertical cross-sectional view of a vehicle internal antenna device according to another embodiment of the present invention. The basic configuration and operation of the patch antenna unit 520 and the conductive film unit 530 shown in FIG. 5 can be described in the same manner as the patch antenna unit 120 and the conductive film unit 130 described above.

As shown in FIG. 5, the patch antenna unit 520 may be installed inside the room mirror neck unit 512. To this end, the room mirror neck part 512 has an opening 516 formed at one end and an internal accommodation space 518 connected to the opening 516. In this case, one end of the rearview mirror neck 512 is fixed to the front glass 10 of the vehicle and the other end is coupled to the rearview mirror 514. In addition, the patch antenna unit 520 is received and installed in the interior accommodation space 518 of the rearview mirror neck unit 512, and radiates a signal toward the front glass 10 through the opening 516. The conductive film part 530 is installed on the front glass 10 with a predetermined separation distance D from the patch antenna part 520 to compensate for a radiation signal radiated from the patch antenna part 520. In this case, the conductive film portion 530 is provided on one surface of the front glass 10 corresponding to the opening portion 516 of the rearview mirror neck portion 512.

On the other hand, the patch antenna unit 520 and the conductive film unit 530, in the interior receiving space 518 of the rear-view mirror neck unit 512, as in the case of FIGS. 1 and 2, the radiation signal of the patch antenna unit 520 And the reflective signal reflected by the conductive film unit 530 is installed with a separation distance D at which constructive interference occurs. In this case, the patch antenna unit 520 and the conductive film unit 530 are separated by a separation distance corresponding to a half wavelength distance (λ/2) of the radiation signal or an odd multiple of the half wavelength distance (λ/2). Of course, it can be installed at a distance.

As described above, according to the present invention, by installing the antenna device inside the vehicle, especially in the neck portion of the rearview mirror structure, the vehicle's intrinsic aesthetics and damage to the exterior panel are prevented, and even when the angle of the rearview mirror is changed, the antenna angle Can keep. In particular, by compensating the antenna radiation signal using a conductive film, signal loss due to the dielectric constant of the vehicle glass can be minimized, radiation efficiency and antenna performance can be improved, as well as substantially generating and changing the directivity of the antenna device. It can have an effect. Furthermore, it goes without saying that various embodiments according to the present invention can solve various technical problems other than those mentioned in the present specification in the related technical field as well as in the relevant technical field.

So far, the present invention has been described with reference to specific examples. However, those skilled in the art will clearly understand that various modified embodiments may be implemented in the technical scope of the present invention. Therefore, the embodiments disclosed above should be considered from an illustrative point of view rather than a limiting point of view. That is, the scope of the true technical idea of the present invention is shown in the appended claims, and all differences within the scope of equivalents thereto are to be interpreted as being included in the present invention.

100: vehicle built-in antenna device 110: room mirror structure
112: room mirror neck part 114: room mirror
120: patch antenna unit 130: conductive film unit

Claims (10)

A patch antenna unit having one end fixed inside the vehicle and the other end installed at a rear-view mirror neck portion coupled to the rear-view mirror to radiate a signal toward the front glass of the vehicle; And
And a conductive film part installed on the front glass with a predetermined distance from the patch antenna part to compensate for the radiation signal radiated from the patch antenna part,
The patch antenna unit and the conductive film unit are installed at a spaced distance from which constructive interference occurs between the radiation signal of the patch antenna unit and the reflected signal reflected by the conductive film unit,
The conductive film part is composed of an ITO film (Indium-Tin Oxide film) having conductivity and transparency,
The spaced distance is an odd multiple of a half-wavelength distance of the radiation signal. The method of claim 1,
The patch antenna unit,
A dielectric substrate having a predetermined feed hole;
A patch-type radiator disposed on an upper surface of the dielectric substrate; And
And a feed pin for feeding the patch-type radiator through the feed hole. delete delete delete A rear-view mirror neck portion having an opening formed at one end and an interior receiving space connected to the opening, wherein the one end is fixed to the front glass of the vehicle and the other end is coupled to the rear view mirror;
A patch antenna unit received and installed in the interior receiving space of the rearview mirror neck unit and radiating a signal toward the front glass through the opening; And
And a conductive film part installed on the front glass with a predetermined distance from the patch antenna part to compensate for the radiation signal radiated from the patch antenna part,
The patch antenna unit and the conductive film unit are installed at a spaced distance from which constructive interference occurs between the radiation signal of the patch antenna unit and the reflected signal reflected by the conductive film unit,
The conductive film part is composed of an ITO film (Indium-Tin Oxide film) having conductivity and transparency,
The spaced distance is an odd multiple of a half-wavelength distance of the radiation signal. The method of claim 6,
The conductive film part is installed on one side of the front glass corresponding to the opening of the rear-view mirror neck part. delete delete delete

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