JP3036413U - In-vehicle antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] A structure that improves the performance of a relay antenna installed on a window glass of an automobile when radio waves are blocked by the automobile body when a mobile phone or the like is used in the automobile. [Structure] A plurality of antenna radiation elements (2) and power supply lines (3) are arranged on a plane either directly on the window glass (6) or on the electrical insulator film (1) and installed on the window glass.

Description

[Detailed description of the invention]

[0001]

[Industrial application] Relay antenna used for improving the radio wave propagation condition of mobile devices such as car phones and PHS

[0002]

2. Description of the Related Art When a mobile phone (4) having a built-in antenna such as a mobile phone or PH or S is used in a car, the car body and roof (5) of the car are made of metal. The generated radio waves are blocked, and the radio waves only pass through the non-metallic window glass (6), and the communication state deteriorates due to the attenuation of the radio waves and the disturbance of the radiation directivity. As a means to improve this, relay antennas inside and outside the passenger compartment have been commercialized.

As an example, FIG. 2 shows that the antenna (7) provided inside the vehicle receives electric waves inside the vehicle, and reradiates from the antenna (9) outside the vehicle, which is coupled by the coupler (8) through the window glass. This is the configuration. This method has a drawback that the structure is complicated and the performance becomes unstable due to the non-uniformity of the window glass of each car.

FIG. 3 shows a system in which a single antenna element (10) formed of a conductive thin film is attached to a window glass. The structure and handling are simple, but the occupied area of the antenna is The effect is small because it is smaller than the area of the window glass from which radio waves are radiated, the coupling with the antenna of a mobile device in space is small, and the antenna itself has a low gain.

[0005]

[Problems to be Solved by the Invention] For automobiles, it is necessary to improve the communication performance for transmitting and receiving from the passenger compartment and the safety of antenna installation, such as the presence or absence of protrusions from the vehicle body, and inexpensive and easy installation. is necessary.

[0006]

[Means for Solving the Problems] For safety and easy installation, a means for attaching a conductive wire or a thin film to a window glass, a gain of an antenna, and a coupling with a portable equipment antenna in a vehicle cabin are increased. Use means

In order to form a planar structure on the electrical insulator film (1), the antenna radiation element (2) and the feeder line (3) are formed by a conductive wire or a conductive thin film such as aluminum foil or metal vapor deposition. Configure.

In order to increase the degree of coupling and the gain, a plurality of antenna radiation elements (2) are used and are connected by a feeder line (3). In this case, it does not matter whether the antenna radiation element (2) has a single frequency or a shape having a broadband frequency characteristic.

The same effect can be obtained even if the antenna radiation element (2) and the power supply line (3) are provided directly on the window glass (6) or inside the glass by being constituted by a conductive wire.

[0010]

The radio waves transmitted and received by the portable device (4) are coupled to the antenna radiation element (2), and the plurality of antenna radiation elements (2) coupled by the power supply line (3) synergistically effect them to the outside of the passenger compartment. It is re-radiated efficiently.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an example of the configuration of an antenna according to the present invention. This is an example of installation on an automobile window glass as shown in FIG.

[0012]

[Effect of the Invention] The radio waves transmitted and received by the mobile device (4) in the automobile are efficiently relayed by the antenna of the present invention by the influence of the vehicle body and the roof (5) of the automobile, which enables more stable communication. It is highly effective, inexpensive, safe, and easy to install.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an example of a conventional structure.

FIG. 3 is an explanatory diagram of an example of a structure using a conventional thin film.

FIG. 4 is an explanatory view showing an embodiment when it is installed in the automobile of the present invention.

[Explanation of symbols]

 1 Electrical Insulator Thin Film 2 Antenna Radiating Element 3 Feed Line 4 Portable Equipment 5 Car Body and Roof 6 Window Glass 7 Conventional Indoor Antenna 8 Conventional Coupler 9 Conventional External Antenna 10 Conventional Antenna

Claims (2)

[Utility model registration claims] 1. An electrically insulating film (1) having two or more antenna radiation elements (2) composed of conductive thin films.
In-vehicle antenna with a structure in which the two are connected by a parallel wire feed line (3) composed of a conductive thin film 2. Attached to a window glass (6) of an automobile, or
A vehicle-mounted antenna having a structure in which the antenna radiating element (2) and the parallel wire feeder (3) are configured in a plane by a conductor built in the glass.