JPH0563423A - On-vehicle plane antenna - Google Patents

Abstract

PURPOSE:To easily manufacture a thin and light antenna capable of receiving a weak signal by forming each conductive layer and dielectric layer with a thick film. CONSTITUTION:On an on-vehicle window plate 1, a conductive layer for radiation element, a dielectric layer 3, a grounding conductive layer 4 are provided in the order. An input terminal and the conductive layer 2 for radiation element of an amplifier 6 provided near the window plate 1 are connected. The grounding electrodes of an amplifier 6 and the grounding conductive layer 4 are connected. The Ag paste of the conductive layer 2 for radiation element, grounding conductive layer, and a feeder 5 is formed by thick film printing, and the dielectric layer 3 is formed by a thick film using the dielectric including at least one of the dielectric among glass, resin, and ceramics or the like. Therefore, the thickness of the micro strip antenna, that is, the total thickness of the conductive layer 2 for radiation element, the dielectric layer 3, and the grounding conductive layer 4 can be less than several hundreds of mum. Thus, the device can be made light in weight without deteriorating the design in the case it is formed on the window plate 1 on the vehicle opening part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted flat antenna.

[0002]

2. Description of the Related Art Conventionally, a vehicle microstrip antenna in which a dielectric portion of a vehicle outer plate is used as a dielectric substrate to form a microstrip antenna integrally with the vehicle outer plate is proposed in Japanese Patent Laid-Open No. 61-290803. ing.

However, in order to reliably receive the weak signal transmitted from the GPS satellite, it is essential to install an amplifier near the antenna. In addition, it is preferable to install the antenna and the amplifier in the vehicle compartment where the change of the natural environment is small. In addition, a hole for power supply is required in the vehicle skin. In the above publication, the above points are insufficient.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art and to newly provide the above-mentioned previously unknown technology. Is. In other words, it is possible to reliably receive a weak signal and to install an antenna and an amplifier in a vehicle compartment where the natural environment is less likely to change, and to provide a thin flat antenna for a vehicle that does not require drilling on the vehicle outer panel. The purpose is.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes a radiating element conductor layer, a dielectric layer,
A ground conductor layer is provided in this order, the input end of the amplifier arranged near the window glass plate and the conductor layer for the radiating element are connected, and the ground electrode of the amplifier and the ground conductor layer are connected. A vehicle-mounted planar antenna, and a radiating element conductor layer, a first dielectric layer, a ground conductor layer, a second dielectric layer, at least partially on a window glass plate of a vehicle from below. A power supply line is provided in this order, and a conductor for connecting the radiating element conductor layer and the power supply line to holes provided in the first dielectric layer, the ground conductor layer and the second dielectric layer. And further connecting the feed line and the input end of an amplifier arranged in the vicinity of the window glass plate, and connecting the ground electrode of the amplifier and the ground conductor layer to a vehicle. The present invention provides a planar antenna.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 is a perspective view of a vehicle-mounted planar antenna of the present embodiment, in which 1 is a window glass plate provided in a vehicle opening, 2 is a radiating element conductor layer, 3 is a dielectric layer, Reference numeral 4 is a ground conductor layer, a part of which is electrically connected to the outer conductor of the coaxial cable 7 and the ground electrode of the amplifier 6, and 5 is a feeder line connecting the radiating element conductor layer 2 and the input end of the amplifier 6. ,
The coaxial cable 7 has a function of connecting the output end of the amplifier 6 and a receiver installed separately.

The radiating element conductor layer 2, the ground conductor layer 4 and the power supply line 5 are formed by thick film printing of Ag paste, dried and fired at about 550 ° C. However, the present invention is not limited to this.
A g-Pd, Pd, Cu paste, or a metal plate-like body may be bonded with an adhesive or the like.

Further, the dielectric layer 3 is formed of a thick film using a dielectric containing at least one of dielectrics such as glass, resin and ceramics, or a plate-shaped, sheet-shaped or film-shaped one. Can be bonded with an adhesive or the like. When a glass frit or the like that can be fired at about 550 ° C. is used, it is possible to fire the Ag paste and the Ag paste at the same time, and the manufacturing process can be improved.

The thickness of the microstrip antenna manufactured as described above, that is, the total thickness of the radiating element conductor layer 2, the dielectric layer 3, and the ground conductor layer 4 can be set to several hundreds μm or less. There is also an advantage that the design is not impaired even when it is formed on the window glass plate provided in the vehicle opening, and the weight is light.

The shapes of the radiating element conductor layer 2, the dielectric layer 3, and the ground conductor layer 4 are not limited to square shapes, and may be circular or linear. Further, in FIG. 1, the window glass plate 1 is a plate-like body made of an insulating material different from the window glass plate provided in the vehicle opening, and this is attached to the glass surface provided in the vehicle opening with an adhesive or the like. You may adhere by.

[Embodiment 2] FIG. 2 is a perspective view of a vehicle-mounted planar antenna according to Embodiment 2. Reference numeral 21 denotes a first dielectric formed between the radiating element conductor layer 2 and the ground conductor layer 4. A body layer 22 is a second dielectric layer formed between the ground conductor layer 4 and the power supply line 5.

A hole is provided at a predetermined position in each of the first and second dielectric layers 21 and 22 and the ground conductor layer 4, and a conductor is pierced through the hole so that the radiating element conductor layer 2 and the feeder line 5 are formed. Is electrically connected to one end thereof, and the feed line 5 is connected to the input end of the amplifier 6. A part of the ground conductor layer 4 and the second dielectric layer 22 is extended to the vicinity of the input end of the amplifier 6 installed in the vicinity, and the feed line 5 formed on the second dielectric layer 22 is Since the microstrip line has a predetermined impedance, it is possible to make a connection with less loss.

Even in the case where the power supply line has a microstrip line structure, the dielectric layers 21 and 22 and the ground conductor layer 4 are partially formed into holes to form a layer. There is no need for drilling for power supply in the process.

[0015]

According to the present invention, a weak signal transmitted from a GPS satellite can be reliably received, and a thin and lightweight antenna is formed by forming each conductor layer and dielectric layer with a thick film. Can be easily manufactured.
Further, when the second dielectric layer is provided on the ground conductor layer and the power supply line is constituted by the microstrip line, the received signal can be transmitted to the amplifier installed in the vicinity with low loss.

Since the in-vehicle planar antenna according to the present invention can be installed in the vehicle compartment, the operation is stable and the reliability is high.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle-mounted planar antenna according to a first embodiment.

FIG. 2 is a perspective view of a vehicle-mounted planar antenna according to a second embodiment.

[Explanation of symbols]

 1 Window Glass Plate 2 Conductor Layer for Radiating Element 3 Dielectric Layer 4 Grounding Conductor Layer 5 Conductor Layer for Radiating Element 6 Amplifier

Claims (2)

[Claims] 1. A radiating element conductor layer, a dielectric layer, and a ground conductor layer are provided in this order from below on at least a part of a window glass plate of a vehicle, and an amplifier arranged near the window glass plate is provided. A vehicle-mounted flat antenna, wherein an input end is connected to the radiating element conductor layer, and a ground electrode of the amplifier is connected to the ground conductor layer. 2. A radiating element conductor layer, a first dielectric layer, a ground conductor layer, a second dielectric layer, and a power supply line are provided in this order from at least a part of a window glass plate of a vehicle from below. A conductor for connecting the conductor layer for the radiating element and the feeder to the holes provided in the first dielectric layer, the ground conductor layer and the second dielectric layer, and further A vehicle-mounted flat antenna, wherein an electric wire is connected to an input end of an amplifier arranged near the window glass plate, and a ground electrode of the amplifier is connected to the ground conductor layer.