JPH0147921B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a glass antenna with improved horizontal omnidirectional characteristics during FM broadcast reception, particularly to a glass antenna for the rear window of an automobile.

Whip antennas are widely used as antennas for car radio receivers, but recently, as an alternative, antenna wires for AM and/or FM reception have been installed on the surface or inside of the car window glass. A glass antenna is used. In addition, in order to prevent fogging caused by condensation on the rear window glass of automobiles, anti-fog glass has been put into practical use by installing an electric heating heater on the glass plate surface or between the glass plates to prevent fogging.
This energized heating heater has a high-frequency chiyoke coil inserted into each of its lead wires so that it can also be used as a radio receiver antenna, or an antenna wire is separately provided in the margin of the anti-fog glass plate, and an antenna A system in which a high frequency amplification circuit is attached to the wire has been put into practical use or has been proposed.

All of these glass antennas for cars have stronger directional characteristics than whip antennas, especially when receiving FM broadcast waves, depending on the direction of the car.
A shortcoming unique to glass antennas was discovered: FM broadcasts were difficult to receive.

For example, it exhibits an undesirable figure-of-eight directivity characteristic, which generally shows a dip point corresponding to the vehicle's orientation in a direction perpendicular to the direction of the transmitting antenna.
This figure-of-eight characteristic is particularly noticeable when the glass antenna is used in the front or rear window of an automobile. As a result of various studies, the inventor has found that the figure-of-eight characteristics of glass antennas are largely determined by the shape, size, type, etc. of the car body and opening, since FM broadcast waves cause secondary radiation in the car body. I discovered that.

Based on the above knowledge, the applicant has determined that when FM broadcast waves cause secondary radiation in the car body,
In order to prevent the figure-8 directivity characteristic from occurring, the antenna wire pattern of the glass antenna must be aligned horizontally to the left and right with respect to the longitudinal centerline of the vehicle when the glass antenna is fitted into the front or rear window of the vehicle. The antenna wire of the glass antenna may be asymmetrical, or the lead-out point of the antenna wire to the feed point may be located on the horizontal side of the glass antenna, and this lead-out point may be located on either the left or right side of the longitudinal center line of the vehicle body. He found that it was effective to locate the invention in the area of the invention, and filed an application for such an invention.

However, it has been found that a simple left-right asymmetric antenna pattern or side feeding cannot provide sufficient omnidirectionality, and the frequency band of omnidirectionality is extremely narrow.

The present applicant has further improved this point by providing a main antenna line for power feeding from the side of the glass plate in a horizontal direction on a glass plate fitted into the front window or rear window of a car such as a passenger car, and An auxiliary antenna line is provided near the window frame above or below the line, extending in the lateral direction of the glass plate and at a predetermined interval from the main antenna line, and further connecting the main antenna line and the auxiliary antenna line. An application was filed regarding a glass antenna equipped with an antenna wire for adjustment.

An example of such a glass antenna with excellent directivity characteristics is the antenna pattern shown in FIGS. 1 and 2. In such a glass antenna,
The directivity characteristics of the antenna element 2 for FM broadcast waves are considerably affected by the energizing heater for preventing fogging. Since the characteristics deteriorate in the opposing power supply system in which lead wires 5 and 6 are connected to 3 and 4, the power supply circuit pattern of the energizing heater 1 is shaped like a U-shape as shown in Figure 2, that is, one side of the opposing busbars is divided. Then, the lead wires 5 and 6 are connected to each of the busbars 3 and 3' to supply power, so that current flows from the busbar 3 or 3' through the busbar 4 to the busbar 3' or 3 in a U-shape. I had to do something like that.

However, as shown in Figure 2, in a U-shaped electric heating heater, it is necessary to print two layers of silver paste with different electrical resistance values on the undivided busbar in order to suppress the heat generation in the busbar section. First, in this case, in order to satisfy the performance of the electric heating heater for fog removal, the first silver paste is printed and then dried, and then the second silver paste is printed and dried again. This has the disadvantage of increasing manufacturing steps and increasing costs.

The present invention was obtained as a result of research aimed at finding an antenna pattern that would improve the omnidirectional characteristics for FM broadcast waves even in an energizing heater of the opposing busbar feeding system as shown in FIG.

The main antenna element of the antenna glass consists of a main antenna wire that extends in the horizontal direction with one end being an open end, and an auxiliary antenna wire that has an open end that extends in the horizontal direction and is provided above or below the main antenna wire at a predetermined interval. , a phase adjustment antenna line connecting the main antenna line and the auxiliary antenna line, and a feed point for the main antenna element provided on the side of the glass plate, and the separate auxiliary antenna element has a phase adjustment antenna line connecting the main antenna line and the auxiliary antenna line. The present invention relates to an antenna glass for an automobile, characterized in that the antenna glass is provided near the open end of the branch extension and separated from the branch extension in terms of direct current.

In the present invention, as the pattern of the main antenna element provided on the glass plate, a pattern is selected that provides optimum performance as an antenna depending on the shape of the automobile, the dimensions and shape of the glass plate, etc. In particular, the antenna pattern of a glass antenna that is fitted into the rear or front window of a car is such that the feeding point of the main antenna element that connects the antenna feeder line is asymmetrical with respect to the longitudinal centerline of the car. It is preferable that the holder be located on either the left or right side in the lateral direction.

In this way, by making the pattern of the main antenna element of the glass antenna asymmetrical with respect to the longitudinal centerline of the vehicle and by locating the feeding point of the antenna element on the horizontal side of the antenna glass, the operation of the antenna on the antenna glass is improved. and the longitudinal centerline of the vehicle, for example, the operational orientation of the antenna glass relative to the vehicle body can be deflected.
It can be rotated by nearly 90 degrees, effectively improving the figure-of-eight directivity characteristic as described above, and increasing omnidirectionality.

The antenna wire that makes up this main antenna element is
The antenna line may be designed to have a high gain for both FM and AM broadcast waves, and the pattern may be designed to cooperate with both FM and AM broadcast wave bands.
FM and AM are divided into a part that mainly receives AM broadcast waves and a part that mainly receives FM broadcast waves.
It may be designed to have a pattern that receives both broadcast waves, or it may be divided into a part that receives AM and FM broadcast waves and a part that mainly receives AM broadcast waves.
A pattern may be designed to receive both FM and AM broadcast waves.

In the present invention, in order to increase the gain and omnidirectionality in the FM broadcast wave band, the antenna glass is placed near the main antenna element and separated from the main antenna element in terms of direct current, but in terms of high frequency. A separate auxiliary antenna element is provided that can improve the directivity characteristics of the antenna glass by secondarily radiating radio waves incident on the glass plate at the connected position.
In particular, in the case of a main antenna element consisting of multiple antenna wires, one antenna wire connected to the antenna feeder wire, or one of the multiple antenna wires connected in a direct current manner. The antenna wire should be placed close to the antenna wire. In the antenna glass provided with the main antenna element and the separated auxiliary antenna element of the present invention, an antenna feeder wire is connected to one or more places of the main antenna element, and the antenna feeder wire is connected to the separated auxiliary antenna element. Do not connect the wires. Note that this separated auxiliary antenna element is not connected to the antenna line connected to the feeder line.

It is preferable that the separated auxiliary antenna element be provided at a certain distance near the open end of the antenna wire constituting the main antenna element. In particular, it is preferable to provide the separation auxiliary antenna element near the open end of the antenna wire, which has the open end at a position offset to either the left or right side of the glass plate. That is, it is preferable that the separation auxiliary antenna element be provided on either the left or right side of the glass plate and near the open end of the antenna wire having an open end.

Further, it is preferable that the separated auxiliary antenna element is provided on the opposite side of the antenna glass to the side where the feeding point of the main antenna element to which the antenna feeder line is connected is located.

The separate auxiliary antenna element is not electrically connected to the main antenna element in terms of direct current, but is electrically connected at high frequency through capacitive coupling, working to improve the gain in the FM frequency band and increase omnidirectionality. It is preferable that the antenna wire is disposed partially or entirely at a desired length with an interval of 1 mm to 5 mm from one of the antenna wires constituting the main antenna element. Further, it is particularly preferable that the separated auxiliary antenna wire is arranged parallel to the open end of the antenna wire of the main antenna element for a predetermined length with the above-mentioned spacing.

A desired pattern of the separated auxiliary antenna element is selected in accordance with the pattern of the main antenna element, the shape and dimensions of the antenna glass, and the shape of the automobile so that the desired gain and omnidirectionality can be obtained. For example, a separate auxiliary antenna element having a pattern of a single straight, bent, or curved antenna wire or a combination of a plurality of these antenna wires is used.

One or more of these separate auxiliary antenna elements can be provided in the vicinity of the main antenna element.
Furthermore, a plurality of separated auxiliary antenna elements can be arranged in the vicinity, and the separated auxiliary antenna elements can be used in double or triple layers. Furthermore, in order to prevent fogging due to dew condensation, the antenna glass of the present invention is provided with a defogging current that heats the glass plate, which has a large number of heater wires and a pair of busbars connected to both ends of the group of heater wires. A heating heater can be provided. It is usually preferable in terms of performance to install this energizing heater for defogging under the main antenna element of the antenna glass, but it may of course be installed above the main antenna element, or it can be installed above and below the main antenna element on the glass plate. If an element is provided, it may be provided between the upper and lower main antenna elements.

When the antenna glass is also provided with an energizing heater for defogging, the antenna element should be placed at a predetermined distance from the energizing heater for defogging so that the electrical influence of the energizing heater for defogging does not act on the main antenna element. The main antenna element can be placed close to the current heating heater for defogging, or the main antenna element can be placed close to the current heating heater for defogging so that the FM omnidirectionality and gain and AM gain can be improved by the current heating heater for defogging. Alternatively, an energized heater for defogging may be used as part of the main antenna element.
The main antenna element may be directly connected to the energizing heater for defogging to improve the AM gain and the FM omnidirectionality and gain.

Next, examples shown in FIGS. 3 to 12 as antenna glasses of the present invention having typical antenna patterns will be described.

This antenna glass is designed for use in automobiles, in which an energized heating heater for defogging is provided in the vertical center of the glass plate and extends in the horizontal direction of the glass plate, and a main antenna element and a separate auxiliary antenna element are provided above the heating heater. This is an example of antenna glass that is fitted into the rear window. In this antenna glass,
Electric heating heater 16 for removing fogging from glass plate 11
A main antenna wire 24 having a feeding point 18 on the side of the glass plate 11 is provided horizontally on the upper part of the glass plate 11, and
The main antenna line 24 extends in the lateral direction of the glass plate 11 near the window frame above the main antenna line 24.
and an auxiliary antenna wire 25 is provided at a predetermined interval,
A main antenna element having a pattern is provided which has a phase adjustment antenna line 26 connecting the main antenna line 24 and the auxiliary antenna line 25.

The main antenna wire 24 is connected to the antenna glass 10
is provided extending horizontally from the side of the glass plate 11 to the center of the antenna glass 10 when it is fitted into the rear window of an automobile, and one end is connected to a power supply point via a lead-out line. The end connected to the feed point 18 and opposite to the feed point 18 is an open end, and its length is particularly λ/4α±λ/ of the wavelength λ of the desired intermediate frequency in the FM broadcast frequency range.
20α (α: wavelength shortening rate of antenna glass), e.g.
The length ranges from 40cm to 90cm. This main antenna wire 24
It is particularly preferred that the open end of the antenna glass be located approximately in the middle region of the antenna glass. The main antenna wire 24 is not limited to one straight line as shown in FIGS. 3 to 5, but may have a plurality of lines, or may have a curved line.

The auxiliary antenna line 25 extends in the lateral direction of the glass plate near the window frame above the main antenna line 24, and is arranged at a predetermined distance from the main antenna line 24. Note that this auxiliary antenna wire 25
may be provided below the main antenna line 24. In terms of receiving sensitivity, it is preferable that the distance between the auxiliary antenna line 25 and the main antenna line 24 be approximately 1 to 3 cm in parallel. Further, when the auxiliary antenna wire 25 is provided near the window frame, it is preferably provided at a distance of about 1 to 5 cm from the window frame. This auxiliary antenna wire 2
5 is provided above the center of the antenna glass as shown in FIGS. 3 to 12, and a symmetrical pattern with both ends open is optimal. However, the auxiliary antenna 25 has at least one end It is sufficient that the antenna has at least one open end, and that it is provided on the side of the antenna glass. Furthermore, the pattern of this auxiliary antenna wire is not limited to the illustrated example, and may vary depending on the shape of the car body,
The length, number, pattern, etc. are appropriately selected depending on the shape and size of the glass plate, the pattern of other antenna wires, and various other factors.

Further, the auxiliary antenna line 26 for phase adjustment is composed of the main antenna line 24 and the auxiliary antenna line 25, which have different directivity characteristics.
In order to adjust the phase of the FM broadcast wave at the feed point 18 with the AM antenna so that the main antenna line 24 and the auxiliary antenna line 25 are optimally combined
It is used to operate in a reinforcing manner to increase the sensitivity of broadcast wave reception, and its length is selected so as to adjust the phase of the reception radio wave range. This phase adjustment antenna 26 connects between the feeding point side of the main antenna line 24 and the auxiliary antenna line 25. For example, the length of the phase adjustment antenna wire 26 including the auxiliary antenna is in the FM broadcast wave frequency band (76~
90MHz), and more specifically, λ/4 of the wavelength of the center frequency of the FM broadcast frequency band.
The length may be 3/4λ, 5/4λ...n/4λ (n: odd number). In addition, actually λ/4±λ/20, 3/4λ
There is no practical problem if the length is in the range of ±λ/20……n/4λ±λ/20. (λ: wavelength) The phase adjustment antenna line 26 also has an asymmetrical pattern with respect to the vertical center line of the antenna glass, and the horizontal portion of the phase adjustment antenna line 26 is connected to the main antenna line 24 and the auxiliary antenna line. It is preferable that the line be disposed at a different level from the lateral portion of the antenna line 25 at a predetermined interval, and further be substantially parallel to these lines.

Further, the pattern of the phase adjustment antenna wire 26 may further include a folded portion 27 in a part thereof as shown in FIGS. 3-8. Further, an extension portion 28 may be provided by extending a part of the phase adjustment antenna wire.
Also, the number of lines is not limited to one, but may be multiple lines. It is preferable to connect the phase adjustment antenna line 26 and the main antenna line 24 so that the receiving sensitivity of the main antenna line 24 and the directivity characteristics of the FM broadcast waves are not impaired.
For example, it is optimal to connect the phase adjustment antenna line 26 at a portion of the main antenna line 24 that is not the main operating part, that is, near the feeding point 18 of the main antenna line 24. It is also preferable that the phase adjustment antenna line 26 and the auxiliary antenna line 25 are connected so that the receiving sensitivity of the auxiliary antenna line 25 and the directivity of the FM broadcast waves are not impaired. For example, it is preferable to connect the phase adjustment antenna wire 26 near the center or end portions of the auxiliary antenna wire 25.

The feed point 18 is preferably provided in either the left or right side region of the antenna glass 11 and connected to the main antenna line 24, but it can also be provided on the top side of the antenna glass or at other locations depending on the design.

By providing the feed point on the side in this way, it is possible to deflect the vertical center line of the car body and the operational center line of the antenna glass, and the influence of secondary radiation caused by FM broadcast waves on the car body. can be reduced, and the figure-of-eight characteristic can be improved.

In addition, if the AM reception performance is insufficient with only the antenna wire described above, use an additional AM antenna wire, such as the one shown in Figure 4 and Figures 6 to 12.
An antenna wire 29 for AM reinforcement can be provided.

In the antenna glasses shown in Figures 3 and 4 and Figures 6 to 12, the energizing heater for defogging is used to increase the gain and omnidirectionality for FM broadcast waves and/or to increase the gain for AM broadcast waves. In order to be able to use it as an antenna element, the heater wire at the top of the energizing heater for defogging is connected to the AM antenna wire at a distance of 1 mm to 5 mm, for example, so that it is not connected to the direct current. A line 30 is provided.

Furthermore, in the antenna glass of the present invention shown in FIGS. 3 to 12, a separated auxiliary antenna element 31 is provided to a part of the main antenna element, which is separated in terms of direct current but electrically connected in terms of high frequency through capacitive coupling. is provided. Separated auxiliary antenna element 3 in Figure 3
1 is an antenna wire having a cross-shaped shape;
This is provided in parallel at a part of the folded part 27 of the phase adjustment antenna wire at an interval of 1 mm to 5 mm, and the separated auxiliary antenna elements 31 shown in FIGS. This antenna wire has a shape of 〓 or 〓, and this is a bent extension 28 formed by branching and extending a part of the phase adjustment antenna wire and bending its tip. 5
They are installed in parallel with an interval of mm,
Also, Figure 6 shows the folded back 27 of the antenna wire for phase adjustment.
1mm ~ to the extension part 28 which branched and extended a part of
Separate auxiliary antenna elements 31 are arranged parallel to each other at intervals of 5 mm, and in FIG. In addition, Figs. 10 and 12 show the antenna wire for phase adjustment. A folded separate auxiliary antenna element 31 having bent portions is provided at intervals of 1 mm to 5 mm on a bent extended portion 28 formed by extending one portion and bending the tip thereof.

Further, the energizing heating heater 16 for removing fogging provided on the glass plate in FIGS. 3, 4, 6 to 12,
A large number of heater wires 13 with a wire width of about 0.5 mm to 2 mm are formed substantially parallel to each other at intervals of 2 cm to 4 cm in the lateral direction of the glass plate, and a pair of bus bars 14 are connected to both ends of the group of heater wires. It has the following.

Note that the antenna glass of the present invention can provide sufficient gain and omnidirectionality even for an energized heating heater for defogging having a V-shaped bus bar 14; The pattern of the power supply circuit of the energizing heating heater 1 for removal is made into a U-shape, that is, one of the opposing busbars is divided, and the lead wires 5 and 6 are connected to the busbars 3 and 3', respectively, to supply power. It can also be applied to an antenna glass in which current flows from the bus bar 3 or 3' through the bus bar 4 to the bus bar 3' or 3 in a U-shape.

The conductors of the main antenna element, the separate auxiliary antenna element, and the current heating heater for defogging in the present invention are made by mixing and suspending conductive metal powder (for example, silver), low-melting glass frit, vehicle, and other desired components. The most typical example is a wire type, which is formed by printing a predetermined pattern on a glass plate with a conductive paste and firing it, but it is also possible to use thin conductive metal wires. When using this thin metal wire, the thin metal wire is embedded in a laminated interlayer film and is sandwiched between two glass plates to form a laminated glass type.

The reason why omnidirectionality is improved by the antenna glass of the present invention is considered to be as follows. In other words, when conventional antenna glass receives electromagnetic waves, it also receives secondary radio wave radiation from surrounding conductors, such as the car body and an energizing heater for defogging. In an antenna glass pattern in which a separate auxiliary antenna element is provided near the antenna element in terms of direct current but electrically connected to it at a higher frequency than capacitive coupling, the conductor responsible for secondary radiation is connected to the car body. In addition to the energizing heater for defogging, the separation auxiliary antenna element described above is also added, so that the directivity can be adjusted and the antenna glass can be made nearly omnidirectional. In particular, the shape of the separate auxiliary antenna element can be freely selected compared to the other two conductors, namely the automobile body and the defogging energizing heater, so that the directivity can be conveniently adjusted. Note that the above-mentioned secondary radio wave radiation refers to a phenomenon in which when a conductor receives a radio wave, a high-frequency current flows through the conductor, and as a result, a radio wave is radiated from the conductor.

The above points will be further explained with reference to FIG. Now, when a high frequency power source is connected to the antenna glass shown in FIG. 13, a high frequency current is distributed over the main antenna element.

The above current distribution when the separate auxiliary antenna element 41 is not present is defined as I(x,z).

The electric field E due to I (x, z) at a point P (r, φ) on the x-y plane that is sufficiently far from the main antenna element 42
is expressed as E(φ)=f{r, φ, I(x, y)}.

By adding the separated auxiliary antenna element 41 to this antenna system, the current distribution of the main antenna element 42 changes to I'(x,z). Furthermore, since the current distribution I″(x, z) on the separated auxiliary antenna element 41 also acts on the electric field at point P, the electric field strength at point P when the separated auxiliary antenna element 41 is added is E′( φ) = f{r, φ, I′(x, y), I″(x
,
z)}, and the electric field changes due to the presence of the separate auxiliary antenna element 42. This electric field E(φ),
E′(φ) represents the directivity of this antenna system. That is, by adding the separation correction antenna element 41, the directivity of the antenna system can be changed, and therefore, by selecting the position pattern of this separation auxiliary antenna element, the omnidirectionality can be improved.

When using the antenna glass of the present invention, a high frequency amplification circuit can be connected to the antenna glass in order to increase the reception sensitivity of AM and /FM broadcast waves, and a high frequency amplification circuit can be connected to the antenna glass to increase reception sensitivity of AM and /FM broadcast waves. To prevent the inflow of noise, a high-frequency chiyoke coil or capacitor can be connected to the defogging heater.

Next, embodiments of the present invention will be described.

Example 1 Silver paste was printed on the surface of a glass plate using a silk screen printing method to form a pattern of an antenna and an energized heater as shown in Figure 14, dried,
A glass antenna with such a pattern was manufactured by baking. The dimensions of each part of this glass antenna are as follows. (Unit: mm) A=300 B=350 C=50 D=395 E=495 F=550 G=570 H=150 I=1100 J=1 K=34 L=10 M=25 N=35 O=30 P=25 Q=5 R=10 About this glass antenna, 76MHz, 80M
The directional characteristics diagram obtained by measuring the directional characteristics at each FM broadcast frequency of Hz, 85MHz, and 90MHz is shown in the 16th directional characteristic diagram.
In addition, the relationship between frequency, average gain, and minimum gain is shown in FIG. (Average gain of line Xai, minimum gain of line Xmin) Note that the energizing heater consists of a large number of heater wires formed into thin filaments with a width of 0.6 to 0.7 mm at equal intervals of about 3 cm in the lateral direction of the glass plate. The pattern is printed with busbars 50 cm long and 0.8 cm thick facing both ends of the heater wire.
Also, the width of the antenna wire is 0.6 to 0.7 mm.

Comparative Example 1 A silver paste was printed on the surface of a glass plate using a silk screen printing method to form a pattern of an antenna and an electric heating heater as shown in FIG. 15, and the pattern was dried and baked to produce a glass antenna with such a pattern. In this glass antenna, the dimensions of each part are as follows. (Unit: mm) A=300 B=350 C=50 D=395 E=495 G=570 H=150 K=34 L=10 M=25 N=35 O=30 P=25 Q=5 R=10 About this glass antenna, 76MHz, 80M
Figure 17 shows the directional characteristics diagram obtained by measuring the directional characteristics at each FM broadcast frequency of Hz and 90 MHz, and Figure 18 shows the relationship between frequency, average gain, and minimum gain.
As shown in the figure. (Ya: average gain, Ymin minimum gain) The pattern of the energized heater is Example 1.
I did the same as the one.

As can be seen from Example 1 and Comparative Example, the antenna glass of the present invention can separate the auxiliary antenna element in a direct current manner and provide it near the main antenna element, so that it can transmit two radio waves like the conventional antenna pattern. Omnidirectionality in the FM frequency band can be achieved by providing the secondary radiation effect not only to the energizing heater for defogging and the car body, but also to the separate auxiliary antenna element.

Furthermore, the antenna glass of the present invention can be used even if a counter-feed type current heating heater is installed below the antenna.
It is possible to reduce the influence of the energized heater and make the directivity of FM broadcast waves omnidirectional.
Moreover, the performance is almost as good as the performance when an energized heating heater of a U-shaped power supply type is provided. As a result, it is possible to use an energizing heater with opposing power supply, so in this case, there is no need to print one side of the busbar in two stages as described above, as in the case of the U-shaped pattern, which reduces manufacturing costs. The advantage is that it can be done.

[Brief explanation of drawings]

1 and 2 are front views of an antenna glass according to a comparative example, FIGS. 3 to 12 are front views of an antenna glass according to a specific example of the present invention, and FIG. 13 is an explanatory diagram of the present invention, 14 is a front view of the glass antenna according to Example 1, FIG. 15 is a front view of the glass antenna according to Comparative Example 1, FIG. 16 is a directional characteristic diagram of the antenna glass of Example 1, and FIG. 17 is a comparison Example 1
FIG. 18 is a diagram showing the frequency-average gain and minimum gain relationship of the first example product and the first comparative example product. 1, 16: Electric heating heater for defogging, 2:
Main antenna element, 3, 3', 4: bus bar, 5,
6: Lead wire, 10: Antenna glass, 11: Glass plate, 14: Bus bar, 17: Antenna feeder line, 18: Feeding point, 24: Main antenna line, 2
5: Auxiliary antenna line, 26: Phase adjustment antenna line, 27: Folded part, 28: Extension line part, 29:
AM reinforcement antenna wire, 30: Coupling wire, 31, 4
1: Separated auxiliary antenna element, 32, 42: Antenna element.

Claims (1)

[Claims] 1. The main antenna element of the antenna glass consists of a main antenna line that extends in the horizontal direction with one end being an open end, and an auxiliary antenna that has an open end that extends in the horizontal direction and is provided above or below the main antenna line at a predetermined interval. wire, a phase adjustment antenna wire connecting the main antenna wire and the auxiliary antenna wire, and a feeding point for the main antenna element provided on the side of the glass plate,
An antenna glass for an automobile, characterized in that the separation auxiliary antenna element is provided in the vicinity of the open end of the branch extension of the phase adjustment antenna line so as to be separated from the branch extension in terms of direct current.