JP3185238B2 - GPS antenna structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a GPS antenna structure for receiving radio waves from GPS satellites.

[0002]

2. Description of the Related Art Conventionally, in this type of GPS antenna, as shown in FIG. 7, a high-frequency coaxial connector is provided between the antenna and a preamplifier, and an antenna output is transmitted to the preamplifier via the coaxial connector. For this reason, in the inspection of the GPS antenna, the characteristic inspection is performed using the coaxial connector.

[0003]

However, this high-frequency coaxial connector has a high cost and is a factor that increases the unit price of the product.

Accordingly, it is an object of the present invention to finally provide a GPS antenna structure in which a high-frequency coaxial connector is not provided between an antenna and a preamplifier, and an antenna output can be inspected.

[0005]

In order to achieve the above object, the present invention provides an antenna for receiving a radio wave from a GPS satellite, a preamplifier electrically connected to the antenna and amplifying a signal from the antenna. A GPS antenna structure having a power supply pin connected to a feed point of the antenna and having a tip connected to the preamplifier to perform an electrical connection between the antenna and the preamplifier; Having a plate attached to the antenna, the tip of the power supply pin having the shape of a contact pin of a coaxial connector used for antenna inspection, and penetrating the plate to form the tip The coaxial connector was connected to a preamplifier at the stage where the tip of the power supply pin was passed through the plate. Fixed to the rate is characterized in that so as to permit the insertion of the power supply pin allows the testing of the antenna.

[0006]

In the above construction, the power supply pin is for making an electrical connection between the antenna and the preamplifier, and has a tip portion having a contact pin shape of a coaxial connector used for antenna inspection. . The feeding pin passes through a plate used for grounding the antenna. Here, at the stage when the power supply pin is passed through the plate, the coaxial connector is fixed to the plate to allow insertion of the power supply pin so that the antenna can be inspected. After this inspection, the coaxial connector is removed and the power supply pin is removed. To the preamplifier.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a diagram showing an antenna structure showing one embodiment of the present invention. In FIG. 1, a feed pin 2 for extracting the output of the antenna 1 is attached to the antenna 1 so as to penetrate the antenna 1, and the antenna 1 is fixed to a radome 4 by screws with an aluminum plate 3. At this time, the power supply pins 2 attached to the antenna 1 penetrate through the through holes of the aluminum plate 3. This through hole is shaped so that impedance matching can be achieved with the power supply pin 2. The power supply pin 2 is fixed to the antenna 1 by soldering the tip 2a shown in FIG.

Here, the tip 2b of the power supply pin 2
As shown in FIG. 2, is processed into a shape that becomes a contact pin of the coaxial connector. Therefore, the feeding pin 2 becomes a coaxial contact pin as it is, and the antenna 1 shown in FIG.
Is performed. That is, the inspection is performed by inserting the tip 2b of the power supply pin 2 into the coaxial connector 7 and fixing the coaxial connector 7 to the aluminum plate 3 with screws. This state is shown in FIG. The aluminum plate 3 has screw holes 3 for attaching the coaxial connector shown in FIG.
a and 3b are provided to facilitate attachment of the coaxial connector 7 to the aluminum plate 3.

Since the impedance matching structure is employed, the coaxial connector 7 is coupled to the plug 8 as shown in FIG.

After the characteristic evaluation is completed, the coaxial connector 7 is removed from the aluminum plate 3 and the coaxial connector 7 is removed.
The leading end 2b of the power supply pin 2 penetrating through the preamplifier 5 is penetrated through the preamplifier 5, and the preamplifier 5 is fixed to the aluminum plate 3 with screws. Then, the distal end portion 2b of the power supply pin 2 is soldered to the input portion of the preamplifier 5, and then the cover 6 is fixed to the aluminum plate 3 with a screw to form a GPS antenna.

Therefore, the distal end portion 2b of the power supply pin 2 is formed into a shape that becomes a contact pin of the coaxial connector. Therefore, the coaxial connector is electrically connected between the antenna and the preamplifier as in the prior art. Electrical connection can be made with the power supply pin without connection, and the characteristic test of the antenna can be performed using the power supply pin.

In the inspection, the antenna 1 is fixed to fix the coaxial connector 7 into which the feed pin 2 is inserted.
However, the aluminum plate 3 is not used only for attaching the aluminum plate 3, but the antenna 1 has good grounding properties to improve the antenna characteristics. That is, in order to improve the characteristics of the antenna, it is necessary to increase the ground area to some extent, but the ground area is secured by the aluminum plate 3.

In the above embodiment, the aluminum plate 3
Is used to secure the coaxial connector 7 and secure the ground area of the antenna 1. However, in addition to the aluminum plate 3, plates using other materials can be used if both conditions are satisfied. It may be used.

Next, the mounting of the GPS antenna having the above configuration on a vehicle will be described. The GPS antenna A is mounted in the instrument panel of the vehicle and below the rear tray, as shown in FIGS.

In FIG. 5, reference numeral 10 denotes a windshield, 1
Reference numeral 1 denotes an instrument panel, and a GPS antenna A
Is mounted in the instrument panel 11 using the bracket 12. In FIG. 6, reference numeral 13 denotes a rear glass, 14 denotes a rear tray, 15 denotes a body of the vehicle, and a GPS antenna A is mounted on the body 15 with a fastener 16 by one-touch.

Here, since the GPS antenna A is mounted at a predetermined distance below the instrument panel 11 and the rear tray 14 in the vehicle cabin, the GPS antenna A
On the instrument panel 11 and rear tray 14
Will exist. Since each of them is a dielectric such as a resin or a sound absorbing material, it affects the reception frequency of the GPS antenna A and causes a frequency shift in the reception of the antenna 1. For this reason, FIG. 1 shows that the set frequency received by the antenna 1 is shifted by several M hertz from 1575 M hertz, which is the reception frequency of the radio wave from the GPS satellite, for example, to a set frequency of 1585 M hertz. The receiving area of the antenna 1 is set.

[0017]

As described above, in the present invention, the tip of the power supply pin is formed in the form of a contact pin of a coaxial connector used for antenna inspection, so that the tip of the power supply pin is used. Inspection of the antenna using a coaxial connector can be performed, and after this inspection, the coaxial connector is unnecessary and the leading end of the power supply pin is connected to the preamplifier. Since the plate for fixing the coaxial connector used for the inspection is also used for grounding the antenna, there is an excellent effect that the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory view of mounting an antenna structure according to an embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration of a power supply pin.

FIG. 3 is an explanatory diagram for explaining inspection of an antenna.

FIG. 4 is a diagram showing an attached state at the time of antenna inspection.

FIG. 5 is a diagram showing a state where a GPS antenna is mounted in an instrument panel.

FIG. 6 is a diagram showing a state where a GPS antenna is attached below a rear tray.

FIG. 7 is a diagram showing a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Feeding pin 3 Aluminum plate 4 Radome 5 Preamplifier

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01Q 1/00 H01Q 13/08 H01Q 23/00

Claims (1)

(57) [Claims] An antenna for receiving a radio wave from a GPS satellite, a preamplifier electrically connected to the antenna and amplifying a signal from the antenna, and a leading end connected to a feeding point of the antenna and connected to the preamplifier. A GPS antenna structure having a power supply pin connected to perform electrical connection between the antenna and the preamplifier, the GPS antenna structure having a plate attached to the antenna for grounding the antenna, The tip of the pin is formed in the form of a contact pin of a coaxial connector used for antenna inspection, and the tip of the pin is connected to the preamplifier through the plate. At the stage of penetrating the plate, the coaxial connector is fixed to the plate to allow insertion of the power supply pin, A GPS antenna structure characterized in that an antenna inspection can be performed.