JPH0652210U - High frequency glass antenna for automobiles - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the reception sensitivity from being affected by ambient temperature changes. [Structure] Insulating film 4 on glass plate 1 of automobile window,
An antenna was provided by providing an antenna conductor 3 in which the insulating film 4 was wholly or partially laminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency glass antenna for an automobile, which is suitable for transmitting and receiving in the UHF band (300M to 3GHz).

[0002]

[Prior art]

 Conventionally, as a high frequency glass antenna for automobiles for UHF band reception, laminated glass has been used for the glass plate of automobile windows, and a thin wire consisting of a conductor wire is looped between the laminated glass and used as an antenna conductor. Was. However, this does not have sufficient dimensional accuracy for UHF band reception, and the reception sensitivity was greatly affected by variations in products during mass production and changes in ambient temperature.

[0003]

[Problems to be solved by the device]

 The present invention aims to solve the above-mentioned drawbacks of the prior art, and provides a new high frequency glass antenna for an automobile, which has not been known in the past.

[0004]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and is characterized in that an antenna is provided by providing an insulating film on a glass plate of an automobile window and an antenna conductor partially or entirely laminated on the insulating film. It provides a high-frequency glass antenna for automobiles. Hereinafter, embodiments will be described in detail with reference to the drawings.

[0005]

【Example】

 FIG. 1 is a perspective view showing an embodiment. In FIG. 1, 1 is a glass plate of a window made of laminated glass, 2 is an antenna part, 3 is an antenna conductor made of metal foil, 4 is an insulating film, 5 is a feeding part of the antenna conductor 3, 6 is a feeder line, 11 Indicates a transceiver. In the antenna section 2, a part of the antenna conductor 3 and the feeding section 5 are formed on the insulating film 4. As shown in FIG. 1, in the embodiment, an antenna conductor 3 and an insulating film 4 in which a part of the antenna conductor 3 is laminated are interposed between laminated glasses.

The radio wave received by the antenna conductor 3 is sent to the transceiver 11 via the feeder line 6 connected to the feeding point 5. Similarly, the transmission wave emitted from the transceiver 11 is fed to the feeding portion 5 via the feeder line 6, and the radio wave is radiated from the antenna conductor 3.

FIG. 2 is a perspective view when only the antenna unit 2 is taken out. The antenna conductor 3 and the feeding point 5 are metal foils, and copper is preferable as the metal foil, and copper is plated with gold or solder. It may be one. It should be noted that not only these materials but also other conductive materials can be used. Copper foil was used in the examples. The thickness of the metal foil is preferably 5 μm to 70 μm, more preferably 20 μm to 50 μm, from the viewpoint of receiving sensitivity. In the embodiment, it is set to 35 μm.

The line width of the antenna conductor 3 is preferably 0.5 mm to 3 mm in terms of reception sensitivity, and is 0. 5 mm to 1.5 mm is more desirable. In the embodiment, it is 0.8 mm. The size and shape of the antenna conductor 3 are intended for the reception of GPS satellites. In this case, since the frequency is 1575.42 MHz, a square with one side of 61 mm was used.

When receiving a 2.5 GHz radio wave for road information, it is suitable to use a square having a side of about 38 mm. The size and shape of the antenna conductor 3 are not limited to this, and may be appropriately designed. The shape of the antenna conductor 3 may be a substantially polygonal shape or a substantially circular shape.

A polyester film or a polyimide film is suitable for the insulating film 4, but a polyimide film is more preferable among them. The thickness of the insulating film 4 is preferably 20 μm to 200 μm from the viewpoint of receiving sensitivity, but more preferably 40 μm to 80 μm. In the embodiment, the insulating film 4 has a thickness of 50 μm.

The larger the number of laminated portions of the antenna conductor 3 laminated on the insulating film 4, the more the dimensional accuracy of the antenna conductor 3 is improved. Therefore, it is desirable that the area of the insulating film 4 is large. However, when the insulating film 4 is opaque, the insulating film 4 obstructs the visual field. Therefore, it is desirable that the insulating film 4 has an area that does not obstruct the visual field. Further, when the insulating film 4 is transparent and does not obstruct the view, or when the antenna conductor 3 is rectangular and the insulating film 4 does not obstruct the view, the entire antenna conductor 3 is the insulating film 4. It is desirable to be laminated on top. This is because the dimensional accuracy of the antenna conductor 3 is improved.

In the example, an 80 mm × 20 mm insulating film was used. In the other examples, the feeding point 5 had a size of 5 mm × 5 mm, the feeder line 6 was a coaxial cable with a characteristic impedance of 50 Ω, and the transceiver 11 was a receiver for a GPS satellite.

Although the received signal of the antenna conductor 3 is directly connected to the transceiver in the embodiment, an amplifier may be interposed between the power feeding unit 5 and the transceiver 11 in order to cope with a weak radio wave. . In addition, although the antenna conductor 3 and the insulating film 4 are interposed between the laminated glass in the embodiment, the laminated glass or one glass plate is used as the glass plate 1, and the antenna conductor 3 and the insulating film 4 are provided on the surface thereof. It may be bonded with an adhesive or the like.

The antenna conductor 3 is made by photo-etching a metal foil laminated on an insulating film, and an unnecessary portion of the insulating film 4 is dissolved and removed by a solution as needed to remove the antenna. The department is made.

[0015]

[Effect of device]

 The high-frequency glass antenna for automobiles of the present invention has a high dimensional accuracy of the antenna conductor, and can obtain stable receiving sensitivity to variations in products during mass production and temperature changes. Furthermore, since the shape of the antenna conductor 3 can be determined by photoetching, the effect that productivity is good is also recognized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment.

FIG. 2 is a perspective view of an antenna unit according to an embodiment.

[Explanation of symbols]

 1: Glass plate of window 2: Antenna part 3: Antenna conductor 4: Insulating film 5: Power supply part 11: Transceiver

Claims (1)

[Scope of utility model registration request] 1. An insulating film on a glass plate of an automobile window,
A high frequency glass antenna for an automobile, comprising an antenna conductor which is wholly or partly laminated on an insulating film to form an antenna.