JPH06152219A - Antenna for mobile body - Google Patents

Abstract

PURPOSE:To improve the mount location of the antenna to a mobile body with respect to the antenna for mobile body. CONSTITUTION:In the mobile body antenna mounted on a mobile body having a resin-made roof body 30 transmitting a radio wave and receiving a radio wave, the antenna is installed on the surface or in the inside of a resin-made inner mount member 31 installed in the inside of the resin-made roof body 30 and through which a radio wave is transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for a mobile body, and more particularly, the present invention relates to improvement of a place where the antenna is installed on the mobile body.

[0002]

2. Description of the Related Art As a conventional antenna for a moving body, there is a rod antenna. Since many of these rod antennas protrude from the body of the moving body, there is a problem that wind noise and breakage easily occur. To solve this problem, there is an antenna installed on the window glass of a moving body. In this case, it is well known that the sensitivity is not good because a conductor having sufficient sensitivity cannot be arranged in order to secure a visual field through the window glass. In order to solve the above problem, there is a method of embedding an antenna in a part made of a material that transmits radio waves in a part of the body of a moving body.

[0003]

However, when the antenna of the body of the moving body is embedded as in the conventional case, there is a problem in that it takes time and effort for manufacturing. Therefore, an object of the present invention is to provide a mobile antenna that can be installed in a place other than the body, which does not take time and effort in manufacturing in view of the above problems.

[0004]

In order to solve the above-mentioned problems, the present invention provides an antenna for a mobile body which is mounted on a mobile body having a resin roof body which transmits radio waves and which receives radio waves. A resin-made interior material that is installed inside a roof body made of resin and that transmits radio waves, and is installed on or inside the surface of the resin-made interior material that faces the resin roof body side. is there.

[0005]

According to the antenna for a mobile object of the present invention, the resin-made interior material, which is installed inside the resin roof body and transmits radio waves, faces the resin roof body side. Since the resin-made interior material is installed on the surface of or inside the resin-made interior material, the resin-made interior material has less mechanical restrictions in terms of manufacturing than the roof body made of resin, and the antenna can be easily installed. Therefore, the time and effort required for manufacturing are no longer required as in the conventional case. In addition, by installing the antenna in this way, it is possible to prevent wind noise and damage to the antenna element as in the conventional antenna.
In addition, there are less restrictions on the appearance of the antenna than an antenna installed on glass, and it is possible to use an antenna element with a higher gain and expect to improve the antenna sensitivity.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top view showing an outline of a moving body on which an antenna according to an embodiment of the present invention is installed, and FIG.
It is a -A cross section and is a figure which shows the antenna installed in the interior part of a mobile body. As shown in FIG. 1, there is a resin roof body 30 and a resin interior material 31 on the ceiling of a moving body such as a passenger car, and the antenna 10 is installed on the latter resin interior material 31. Here, the resin roof body 30 and the resin interior 31 are materials that transmit radio waves. Figure 2
As shown in (a), a resin interior 31 is provided in the lower portion of the roof body 30 with a certain space left after the process. A room lamp 32 is provided on the inner surface of the resin interior 31.
Is provided, and the antenna 1 is provided on the outer surface opposite to the room lamp 32. Since the resin interior 31 generally has the property of being less mechanically constrained than the roof body 30 in terms of manufacturing and being easy to install an antenna, it does not take much labor in manufacturing as in the conventional case. . In addition, by installing the antenna in this way, the wind noise of the antenna and the damage to the antenna element as in the past can be prevented, and there are less restrictions on the appearance of the antenna compared to the antenna installed on glass. It is possible to use an antenna element having a higher gain, and it is possible to expect an improvement in antenna sensitivity.

FIG. 2B is a modification of FIG. 1A, in which the antenna 1 is embedded in a resin interior 31. Even with this modification, the same effect as the above can be obtained. Next, the antenna used will be described. FIG. 3 is a diagram showing a planar biconical antenna according to an embodiment of the present invention, and FIG. 4 is a BB cross section of FIG. The antenna device 10 provided on the resin interior material 31 includes an element 11,
A first planar biconical antenna (hereinafter referred to as a first planar antenna) 1 composed of 12 and an element 2
A second planar biconical antenna (hereinafter, referred to as a second planar antenna) 2 composed of 1 and 22; a first coaxial cable 4 for feeding the first planar antenna; and a second coaxial cable 5 for feeding the second planar antenna. Is equipped with. The elements 11, 12, 21, 22 are made of, for example, copper foil or the like. Then, a tunnel member 112 made of copper foil or the like is attached to the element 11 by soldering or the like, whereby a cylindrical space is formed by the element 11 and the tunnel member 112, and the first and second coaxial cables 4 are formed. 5 are arranged so as to pass through the cylindrical space. The tubular space is filled with a resin member 113, and the resin member 113 allows the tunnel member 112 to be filled.
Is secured, and the first and second coaxial cables 4 and 5 are held.

Here, the connection state of the coaxial cable will be described with reference to FIG. FIG. 5 is a circuit diagram showing a connection state of each part of FIG. The first coaxial cable 4 includes a core wire 41 and an outer conductor 42, the core wire 41 is connected to a feeding point 121 of the element 12, and the outer conductor 42 is the element 11.
Is connected to the power feeding point 111 of. The second coaxial cable 5 includes a core wire 51 and an outer conductor 52, and these core wire and outer conductor are connected to the feeding point 211 of the element 21 and the feeding point 221 of the element 22 via the balun 3. .

The balun 3 is composed of capacitors C1 to C3 and coils L1 to L4, and connects the unbalanced coaxial cable 5 to the elements 21 and 22 in a balanced state. Incidentally, the outer conductor of the coaxial cable 5 is connected. 52 is connected to the outer conductor 42 of the coaxial cable 4. Thereby, even if the coaxial cable 5 is inserted into the cylindrical space of the element 11, the interference between the coaxial cable 5 and the element is unlikely to occur.

FIG. 6 is a diagram for explaining the laying of the power supply cable, and FIG. 7 is a diagram showing the connection to the receiver. The coaxial cables 5 and 4 are input to the demultiplexers 321 and 322, respectively, as shown in FIG. 7 via the pillars 33 shown in FIG. 6, and the output signals are branched to the AM receiver 323 and FM.
Input to the receiver 324 and the TV receiver 325. As a result, omnidirectionality and diversity effects can also be obtained.

FIG. 8 is a view showing another planar biconical antenna according to the embodiment of the present invention. Resin interior material 31
The antenna 10 provided in 1 includes the first and second planar biconical antennas 1 and 2, and feeding coaxial cables 4 and 5 connected to the antennas 1 and 2. The outputs of the power feeding coaxial cables 4 and 5 are branched by the demultiplexers 321 and 322 and given to the AM receiver 323, the FM receiver 324, and the TV receiver 325.

In the power supply cable 4, the core wire 6a is connected to the flat plate 12, and the ground wire 7a is uniformly connected to the flat plate 11. Similarly, in the power feeding cable 5, the core wire 6b is connected to the flat plate 21, and the ground wire 7b is uniformly connected to the flat plate 22. Antennas 1 and 2 have a long side of 1 m and a short side of 50 cm
In this case, the two antennas are placed 20 cm apart. The length of the general resin interior material 31 in the longitudinal direction is 1
Since it is about 20 cm, the antennas 1, 2 are
Can be installed.

The flat plate 22 to which the ground wire 7b is connected in the antenna 2 is the side far from the antenna 1. Therefore,
Most of the electric lines of force of the antenna 1 are concentrated between the flat plates 11 and 12. On the other hand, since the flat plates 11 and 12 of the antenna 1 are equidistant from the flat plate 21 of the antenna 2, the flat plate 21
The lines of electric force from are not only toward the flat plate 22 but also toward the flat plate 11. However, the degree is small because the distance between the antennas 1 and 2 is small, and the total radiation pattern becomes nearly omnidirectional.

FIG. 9 is a diagram showing another planar biconical antenna according to the embodiment of the present invention. The arrangement of the antennas 1 and 2 in this figure is the same as that in FIG. 8, except that baluns 8a and 8b are used for connection with the feeding coaxial cables 4 and 5. When the baluns 8a and 8b are used, the impedance matching between the feeding coaxial cables 4 and 5 and the antennas 1 and 2 is improved, the loss in the feeding portion is reduced, and the gain is high. In this case, the FM receiver and the TV receiver are connected.

As described above, the planar biconical antenna is installed on the resin interior material 31 as an antenna, but the present invention is not limited to this. GPS (Global Positioning System)
A used microstrip antenna or dipole antenna may be installed.

[0016]

As described above, according to the present invention, a resin interior material that is installed inside a resin roof body and transmits radio waves, and that faces the resin roof body side is used. Since the interior material made of resin has less mechanical restrictions in terms of manufacturing than the roof body made of resin, it is easy to install the antenna because it is installed on the surface or inside the interior material made of resin. The manufacturing labor is no longer required as in the conventional case.

[Brief description of drawings]

FIG. 1 is a top view showing an overview of a moving body in which an antenna according to an embodiment is installed.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing an antenna installed in the interior part of a moving body.

FIG. 3 is a diagram showing a planar biconical antenna according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a circuit diagram showing a connection state of each part of FIG.

FIG. 6 is a diagram illustrating the laying of a power supply cable.

FIG. 7 is a diagram showing a connection to a receiver.

FIG. 8 is a diagram showing another planar biconical antenna according to an embodiment of the present invention.

FIG. 9 is a diagram showing another planar biconical antenna according to an embodiment of the present invention.

[Explanation of symbols]

 1, 2 ... Planar antenna 4, 5 ... Feeding coaxial cable 10 ... Antenna 30 ... Resin roof body 31 ... Resin interior material

Claims (1)

[Claims] 1. An antenna for a mobile body, which is mounted on a mobile body having a resin roof body (30) which transmits radio waves and receives radio waves, comprising: being installed inside the resin roof body (30); A resin-made interior material (31) that transmits radio waves, the resin-made interior material (31) being installed on or inside the resin-made interior material (31) facing the roof body (30) side. Antenna for mobiles.