JPS5816250Y2 - Window glass antenna with feeder wire - Google Patents

Description

[Detailed description of the invention] The present invention is a feeder edge-attached windowpane antenna, especially a feeder wire suitable for transmitting high frequency current induced in an antenna element installed on an automobile windowpane to a receiver with small transmission loss. Concerning a window glass antenna with.

Conventionally, window glass antennas have been developed that use a conductor baked on the surface of an automobile window glass using a conductive paste containing silver powder and low-melting glass frit suspended in an organic solvent as an antenna element, or the main surfaces of two sheets of glass. 2. Description of the Related Art Window glass antennas are known that use as antenna elements thin metal wires embedded in the synthetic resin film of automobile safety glasses that are made to face each other and bonded with a synthetic resin film.

The antenna element of such a window glass amplifier usually uses a low capacity coaxial feeder as a feeder line, which has low transmission loss and is easy to adjust the ranking.
The high frequency current induced in the antenna element is transmitted to the antenna terminal of the receiver.

When such a car window glass antenna is fitted into a window, the space around the window is small, so it is difficult to pull out a low-capacity coaxial feeder due to its thickness, or it is difficult to pull out a coaxial feeder. Therefore, soldering between the antenna element and the core wire of the coaxial feeder sometimes weakens the strength of the part.

In such a case, solder a thin coaxial feeder or a single vinyl-coated wire to the antenna element of the window glass antenna, pull it out, and connect its tip to one end of a thin, low-capacity coaxial feeder. was connected via.

However, if a thin coaxial feeder is used as the lead wire from the antenna element, the core wire is thin, so soldering to the antenna element has the disadvantage of weakening the mechanical strength of the part and breaking the wire. The cost is high, and since the coaxial feeder is thin, the capacitance per unit length is small, and if the length becomes long, tracking adjustment of commercially available automotive receivers becomes impossible.

On the other hand, if a single vinyl-coated wire is used as a lead-out wire, the capacitance of the vinyl-coated wire to the ground changes depending on the position of the vinyl-coated wire, and the impedance of the vinyl-coated wire on the antenna element side changes and becomes unstable. There is a drawback that matching between the element and the feeder line becomes impossible, and therefore the gain of the antenna system becomes small.

In particular, for window glass antennas in which the antenna element is installed on the glass of a window whose window frame itself moves, such as in lift bank type automobiles, it is necessary to make the lead wire from the antenna element long, and the lead wire must be coated with a single wire vinyl. When a wire is used, there is a drawback that the gain of the antenna system in a high frequency band, for example, an FM broadcast wave band, is significantly reduced.

The present invention was made in order to eliminate the above-mentioned drawbacks, and the present invention consists of a window glass, an antenna element made of a conductor provided on the surface of the window glass, and an electrical connection to the antenna element. - the feeder line consists of a parallel line feeder and a coaxial feeder, one end of which is electrically connected to the antenna element, and the other end of the parallel line feeder; This is a window glass antenna with a tweeter wire, characterized in that one end of the core wire of the coaxial feeder is connected to the ground, and the other wire of the parallel wire feeder and the outer conductive wire of the coaxial feeder are grounded.

Embodiments of the present invention will be described in detail below with reference to the drawings.

1st. In the figure and FIG. 2, 1. is an automobile window glass antenna, which consists of two glass plates 2, 2' that have almost the same shape and only one glass plate 2 has a cutout 3.
are laminated and bonded together with a polyvinyl butyral film 5 to which a thin metal wire antenna element 4゜4' is fixed. One end of the antenna elements 4, 4' is soldered to both ends of the brass terminal block 6 glued to the terminal block 3', and the feeder wire I is connected from the center of the terminal block 6.
This is what was brought out.

The feeder line γ consists of a parallel wire feeder 8 made of parallel vinyl coated wire and having an impedance of approximately 1300, and a coaxial feeder 9 having an impedance of 1500 and having a capacitance of 23PF/m and a thickness of 7mgφ per unit length. stand 6
One wire 8 of a two-core parallel wire feeder 8 with a length of 15α and 12 thin metal wires per core pulled out from the center of the
' is caulked with a metal piece 6' and then soldered, and the other end of the wire 8' is connected to the core wire of a coaxial feeder 9, which has a male connector 1 for connecting to a receiver at the other end, via a coaxial connector 0. The other wire 8'' of the parallel wire feeder 8 has one end connected to the metal body of the car near the antenna elements 4, 4', and the other end grounded to the metal body of the car via the coaxial connector 0. ing.

The window glass antenna 1 configured as described above uses the parallel line feeder 8 and the coaxial feeder 9 for the feeder line T, so that even if the parallel line feeder 8 is lengthened, its capacitance to ground does not change and its impedance is stable. Therefore, by adjusting the length of the parallel wire feeder 8 or the coaxial feeder 9, the impedance of the terminal portion of the antenna elements 4 and 4' can be matched with the impedance of the antenna element side of the parallel wire feeder 8. □The overall gain of the antenna system can be controlled.

The table shows the results of comparing the gain (dB) of the windowpane antenna according to this embodiment with a conventional windowpane antenna using vinyl-coated single wires of the same length in place of the parallel wires F and D8.

According to this, the window crow antenna of this embodiment can obtain a higher gain of about 4.4 dB on average between 76 MH2 and 108 MH2 than the conventional window crow antenna.

Moreover, the window glass antenna 1 according to the present invention has an antenna element 4.
, 4' and the parallel wire feeder 8 having a large number of thin metal wires, the mechanical strength of the connection portion can be increased.

Furthermore, since the window glass antenna 1 according to the present invention connects the antenna elements 4, 4' and the parallel wire feeder 8, it has a lower capacitance to ground than an antenna using a thin coaxial feeder. This makes it possible to easily adjust the receiver's tracking.

In the above embodiments, we have described a window glass antenna in which the antenna element is a thin metal wire embedded in the synthetic resin film of a laminated glass in which the main surfaces of two sheets of glass face each other and are bonded together with a synthetic resin film. The present invention is not limited thereto and may be modified within the scope of the registered claims.

For example, the present invention may utilize an antenna element made of a conductor baked on the surface of a window glass using a conductive paste in which silver powder and low-melting glass frit are suspended in an organic solvent; A heating conductor on which a conductive paste is baked in order to remove the antenna element may also be used as an antenna element.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view of the present invention, and FIG. 2 is a partially cutaway view taken along lines 1--2 in FIG. 2.2! -...Plate glass, 4j4/...Antenna element, 5...Polyvinyl butyral film, T
...Feeder line, 8...Parallel feeder, 9...Coaxial feeder.

Claims (1)

[Claims for Utility Model Registration] l A window glass antenna consisting of a window glass, an antenna element made of a conductor provided on the surface of the window glass, and a feeder line electrically connected to the antenna element. The feeder axis consists of a parallel wire feeder and a coaxial feeder, one end of which is electrically tangent to the antenna element, the other end of the parallel wire feeder is connected to one end of the core wire of the coaxial feeder, and A window glass antenna with a feeder edge, characterized in that the other wire of the wire feeder and the outer conductor of the coaxial feeder are grounded. 2. A window glass antenna with a feeder edge according to claim 1 of the utility model registration, characterized in that both ends of the other wire of the parallel wire feeder are grounded.