JP2001060814A - GPS antenna mount and antenna device - Google Patents

Abstract

(57) [Summary] [Problem] When a GPS antenna is installed in a vehicle interior,
Radio waves from GPS satellites located directly above and slightly behind the vehicle are obstructed by the roof of the vehicle as compared with a case where the PS antenna is installed on the roof or trunk of the vehicle, so that the directivity is apparently reduced. SOLUTION: A GPS antenna 3 is placed on an antenna base 2 in which a part or an arbitrary part of a metal plate such as an aluminum plate is bent or two metal plates are joined at an angle,
The GPS radio wave A is reflected on the bent or raised metal plate portion 2b. Further, the metal plate portion 2b blocks harmful radio waves from the other in-vehicle electronic devices 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a GPS (Global Positioning Syst
The present invention relates to an antenna stand and an antenna device for receiving information from a GPS satellite in em).

[0002]

2. Description of the Related Art Conventionally, a GPS antenna is used to receive GPS information used in an on-vehicle navigation device or the like.
There is a case where it is difficult to receive the S radio wave, and there is a tendency that a GPS radio wave from a GPS satellite located lower than the own vehicle position is more difficult to receive. Also, when a GPS antenna is installed in the vehicle interior, GPS radio waves are blocked by the roof of the vehicle, etc., and the directivity is lower than when installed outside the vehicle interior.
It was not preferable to install a GPS antenna in the vehicle interior.

FIG. 4 is a diagram for explaining a conventional standard GPS radio wave reception. A GPS satellite 101 transmits various information such as satellite time and satellite position to the ground.
The GPS antenna 102 is mounted at an arbitrary position on a vehicle roof and receives various information from GPS satellites.
The range that is easy to receive GPS radio waves is the range of V,
The range in which radio waves are not easily received is the range of I. As is clear from FIG. 4, radio waves from satellites at a position lower than the own vehicle position are more difficult to receive.

[0004]

As described above, it is difficult to receive radio waves from a GPS satellite located at a lower position as viewed from the own vehicle position among a plurality of GPS satellites existing in the sky,
In addition, when the GPS antenna is installed in the vehicle interior, the GPS antenna located just above and slightly behind the vehicle is compared to the case where the GPS antenna is installed on the roof or trunk of the vehicle.
Since radio waves from PS satellites are blocked by the roof of the vehicle,
There is a problem that the directivity apparently decreases.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and improves the directivity of the GPS antenna by installing the GPS antenna in the vehicle interior, and improves the directivity of the GPS antenna in the vehicle interior.
An object of the present invention is to provide a GPS antenna base and an antenna device that can prevent a decrease in reception sensitivity due to an interference wave emitted from another electronic device by installing an antenna.

[0006]

The GPS antenna base of the present invention has a flat portion on which a GPS antenna is mounted and a bent portion bent at an arbitrary angle from one end of the flat portion. is there. A GPS antenna is placed on a flat surface, the bent portion faces the indoor side, and the antenna base is arranged close to the front window or the rear window, so that the GPS radio wave incident from the front window or the rear window is reflected at the bent portion. It is possible,
As a result, even if the GPS antenna is installed in the vehicle interior, it is possible to improve the deterioration of directivity. In addition, since the radio wave from other in-vehicle electronic devices can be shielded by the bent portion, a decrease in the receiving sensitivity can be prevented.

Further, the GPS antenna base of the present invention has a GPS antenna base.
A first metal plate on which a PS antenna is mounted; and a second metal plate connected to one end of the first metal plate at an arbitrary angle.
And a metal plate. GPS on the first metal plate
An antenna is mounted, the second metal plate is directed toward the indoor side, and the antenna base is arranged close to the front window or the rear window, so that the GPS radio wave incident from the front window or the rear window can be transmitted to the second metal plate. The reflection can be achieved, so that even if the GPS antenna is installed in the vehicle interior, the deterioration of directivity can be improved. In addition, since the second metal plate can shield radio waves from other in-vehicle electronic devices, it is possible to prevent a decrease in reception sensitivity.

Further, the GPS antenna base of the present invention is characterized in that the first metal plate and the second metal plate are connected via an insulator, whereby the second metal plate is connected to the second metal plate. The effect of radio waves transmitted from the metal plate to the first metal plate can be cut off.

Further, the GPS antenna base of the present invention is characterized in that a space is provided between the first metal plate and the second metal plate so that a space is provided between the first metal plate and the second metal plate. The effect of radio waves transmitted from the second metal plate to the first metal plate can be cut off.

[0010] The GPS antenna device of the present invention includes:
The GPS antenna is fixed to any of the above-mentioned GPS antenna bases, and the antenna and the antenna base can be handled as a set.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) As shown in FIGS. 1 (a) and 1 (b), an antenna device 1 according to Embodiment 1 of the present invention has a GPS antenna 3 mounted on an aluminum antenna base 2 by screwing or bonding. It is fixed with an agent or the like. The GPS antenna 3 is connected to in-vehicle navigation via an antenna cable 4. The antenna base 2 is a GPS antenna 3
And a bent portion 3b bent at an arbitrary angle, for example, in a range of 45 to 90 degrees from one end of the flat portion 3a.

As shown in FIG. 2, the antenna device 1 having such a structure is fixed to the dashboard 6 in the vicinity of the front window 5 of the vehicle (or on the rear deck or tonneau board in the vicinity of the rear window). Fixed). At this time, the horizontal part 2a of the antenna base 2 is fixed to the window side, and the bent part 2b is fixed to the indoor side. By arranging in this manner, the radio waves A1 and A2 from the GPS satellite at a relatively low position incident on the front window 5 can be reflected by the bent portion 2b of the antenna base 2 and received by the GPS antenna 3. On the other hand, radio waves from GPS satellites at relatively high positions are blocked by the roof 7 of the vehicle and cannot be received by the GPS antenna 3 as shown by radio waves C and D in FIG. Even a radio wave at a relatively high position can be received as long as it is incident on the front window 5 like a radio wave B. Thereby, even if the GPS antenna 3 is installed in the vehicle interior, it is possible to improve the deterioration of directivity. Further, since the radio waves from other in-vehicle electronic devices, for example, the audio device 7 and the television monitor 8 can be shielded by the bent portion 2b, a decrease in reception sensitivity can be prevented.

(Embodiment 2) FIG. 4 shows Embodiment 2 of the present invention. A GPS antenna device 11 includes a first metal plate 12a made of aluminum on which a GPS antenna 13 is mounted, and a second metal plate 12a. One end of one metal plate 12a is provided with an antenna base 12 made of an aluminum second metal plate 12b joined at an arbitrary angle of about 45 degrees to about 90 degrees via an insulator 15 such as plastic or rubber. I have. Also in the second embodiment, the GPS antenna 13 is fixed to the first metal plate 12a, the second metal plate 12b faces the indoor side, and the antenna base 12 is arranged close to the front window or the rear window. In addition, the GPS radio wave incident from the front window or the rear window can be reflected by the second metal plate 12b, so that even if the GPS antenna is installed in the vehicle interior, the deterioration of directivity can be improved. Radio waves from other in-vehicle electronic devices can be shielded by the second metal plate 12b, so that a decrease in reception sensitivity can be prevented. Further, the first metal plate 1
Since the insulator 15 is interposed between the second metal plate 12a and the second metal plate 12b, the harmful radio waves are transmitted from the second metal plate 12b, which has received the harmful radio waves from other in-vehicle electronic devices, to the first metal plate 12a. It is possible to prevent a decrease in sensitivity due to conduction.

In the second embodiment, as shown in FIG. 4, the first metal plate 12a and the second metal plate 12b are
5 may be partially connected instead of being entirely connected. Further, as shown in FIG. 5, the first metal plate 12a and the second metal plate 12b are connected only on both sides thereof by a plastic connecting member 16 which is an insulator, and a portion therebetween is formed as a space 17 The same effect can be obtained from the antenna device 21 described above.

[0015]

As is apparent from the above embodiment, the present invention utilizes the characteristic that the GPS radio wave is relatively easily received by mounting the GPS antenna on a metal plate such as aluminum. Bending a part or any part of a metal plate, or placing a GPS antenna on an antenna base where two metal plates are joined at an angle, and reflecting GPS radio waves on the bent or raised metal plate , The GP located at a relatively low position
Radio waves from the S satellite can be easily received, and deterioration in directivity due to installation in the vehicle interior can be compensated. In addition, there is an effect that it is possible to reduce the adverse effect on the GPS radio wave due to interference radio waves from other electronic devices due to being installed in the vehicle interior, and to increase the reception sensitivity.

[Brief description of the drawings]

FIG. 1 is a perspective view (a) and a side view (b) of an antenna device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining an operation of the antenna device according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining an operation of the antenna device according to the first embodiment of the present invention.

FIG. 4 is a perspective view of an antenna device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a modification of the antenna device according to the second embodiment of the present invention.

FIG. 6 is a schematic diagram showing a reception state in a conventional antenna device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna apparatus 2 Antenna stand 2a Flat part 2b Bending part 3 GPS antenna 4 Antenna cable 5 Front window 6 Dashboard 7 In-vehicle audio equipment 8 Television monitor 11 and 21 Antenna apparatus 12 Antenna base 12a First metal plate 12b Second metal plate 13 GPS Antenna 14 Antenna Cable 15 Insulator 16 Connector 17 Space

Claims (5)

[Claims] 1. A GPS antenna base having a flat portion on which a GPS antenna is mounted and a bent portion bent at an arbitrary angle from one end of the flat portion. 2. A GPS antenna base comprising: a first metal plate on which a GPS antenna is mounted; and a second metal plate connected to one end of the first metal plate at an arbitrary angle. 3. The GPS antenna base according to claim 2, wherein the first metal plate and the second metal plate are connected via an insulator. 4. The GPS antenna base according to claim 2, wherein a space is provided between the first metal plate and the second metal plate with a space provided therebetween. 5. The GP according to claim 1, wherein:
A GPS antenna device in which a GPS antenna is fixed to an S antenna base.