JP2000323914A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass antenna suitable for transmitting/receiving radio waves of an extremely short wave band of an automobile telephone, a mobile telephone, personal radio, business radio and PHS, which are practically usable. SOLUTION: The antenna 2 is a glass antenna provided on the window glass of a mobile object such as a vehicle. A first element 3 where a first wire 3a extending clockwise or anticlockwise from a first power feeding point 10 along a metallic window frame line is installed, a first folding wire 3b is installed between the first wire 3a and a window frame in parallel to the first wire 3a, and the tips of sides detached from the power feeding point 10 of the wires 3a and 3b are connected in an almost U shape, and a second element 4 where a second wire 4a is installed along a metallic window frame line from a second power feeding point 11 in a direction similar to the first wire 3a, a second folding wire 4b is installed in a position opposite to the first wire 3a with he second wire 4a as a center and the tips of the sides the second wire 4a and the second folding wire 4b, which are detached from the power feeding point 11 of the wires 4a and 4b, are connected in the almost U shape are arranged. The inner conductor 12a and the outer conductor 12b of a coaxial cable 12 are connected to the first power feeding point 10 and the second power feeding point 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass antenna provided on a window glass of a vehicle such as an automobile and, more particularly, to transmitting and receiving radio waves in an ultrahigh frequency band such as an automobile telephone, a portable telephone, a personal radio, a business radio, and a PHS. It relates to a suitable glass antenna.

[0002]

2. Description of the Related Art Conventionally, a pole antenna has been put into practical use as an antenna for a vehicle for transmitting and receiving an automobile telephone and a mobile telephone. This is not only unfavorable in appearance, but also has disadvantages such as hindering car washing and possibly causing breakage.

Therefore, in recent years, a glass antenna having no projection such as a pole antenna has been demanded, and such an antenna is disclosed in Japanese Patent Application Laid-Open Nos. 6-314921 and 7-122918. Also, transmission and reception gains equivalent to those of pole antennas have come into practical use.

[0004] However, these glass antennas for automobile telephones or mobile telephones are provided with 800 MHz band or 1500 MHz band by adjusting the total length of the element.
Although it can cover any frequency band of the Hz band, it is impossible to use the two types of frequency bands simultaneously with one antenna pattern, and when actually using it, only one of the bands is used. Had to be selected in advance.

[0005] Also, 800 MHz band and 1500 M
Japanese Patent Application No. 10-325639 has been filed by the present applicant as an antenna capable of simultaneously covering both frequency bands in the Hz band with one antenna pattern, and the performance is sufficiently satisfactory and satisfies the purpose. However, since it is composed of horizontal and vertical lines, it is necessary to secure a space in both directions, and an even more compact pattern has been demanded.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and a mobile phone and a mobile phone which can be put to practical use in both the 800 MHz band and the 1500 MHz band with one antenna pattern. Suitable for personal wireless, personal wireless, commercial wireless, P
An object of the present invention is to provide a compact glass antenna for a vehicle that can transmit and receive radio waves such as HS.

A glass antenna disposed on a window glass of a moving body such as an automobile, wherein a first wire extending clockwise or counterclockwise from a first feeding point along a metal window frame line is provided. The first parallel between the first filament and the window frame is parallel to the first filament.
And a first element formed by connecting the tips of the respective wires remote from the feed point in a substantially U-shape, and a second element in the same direction as the first wire. A second line is provided along the metal window frame line from the feeding point of the second line, and a second folded line is provided at a position opposite to the first line with the second line as a center. A second element formed by connecting the distal ends of the filaments and the second folded filaments on the side remote from the power supply point in a substantially U-shape, wherein the first power supply point and the second A glass antenna for a vehicle, wherein an inner conductor and an outer conductor of a coaxial cable are connected to each of the two feeding points.

[0008] Alternatively, the above-mentioned glass antenna for a vehicle, wherein an auxiliary element for adjusting impedance characteristics is provided by branching from the feeding point or the first or second element connected to the feeding point. .

[0009] Alternatively, the above-mentioned vehicle is characterized in that a folded wire is provided again as an auxiliary element for impedance characteristic adjustment at an end of the first folded wire or the second folded wire. For glass antenna.

Alternatively, the auxiliary element is a first element.
The above-mentioned glass antenna for a vehicle, comprising a linear member arranged substantially parallel to the second linear member.

Alternatively, the length of the first filament of the first element is 40 to 60 mm, the length of the first folded filament is 60 to 90 mm, the folding width is 10 to 30 mm, and the first folding is The distance between the line and the window frame is 5 to 20 mm,
The length of the second filament is 100 to 3 as the second element.
00 mm, length of the second folded line is 20 to 100 m
m, the folded width is 10 to 50 mm, and the distance between the second filament and the window frame is 10 to 70 mm.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a glass antenna disposed on a window glass for a moving body such as an automobile, for example, a rear window glass of an automobile as shown in FIG. It is a glass antenna suitable for transmitting and receiving radio waves in the ultra-high frequency band such as commercial radio and PHS.

When the antenna is provided on the rear window glass, a heating wire or the like for defogging is disposed at the center, and therefore, the antenna is usually provided in an upper margin portion and a lower margin portion of the heating wire.

For example, as shown in FIG. 1, this is an example in which a single-pane glass is mounted as a rear window glass of a vehicle when viewed from the outside of the vehicle.
On the inside of the flat glass 1 together with the heating wire 8 for anti-fog,
A plurality of antennas 6 for TV reception and a plurality of antennas 7 for radio reception are provided, and a glass antenna 2 for a mobile phone shown in FIG. 2 of the present invention is provided in a lower left margin of FIG.

FIG. 1 shows an example in which the glass antenna 2 for a car phone is provided at only one place at the lower left, but it may be provided at a plurality of places, and by providing it at a plurality of places, diversity is provided. Reception can be enabled. In this case, the pattern may be the same pattern or a different pattern, or may be on the right side, on the upper left side, or on other peripheral portions.

As a basic pattern of the glass antenna 2 of the present invention, a pattern provided near the lower corner of the rear window glass 1 as shown in FIG. 2 will be described.

As the first element 3, there is provided a first filament 3a extending clockwise or counterclockwise from the first feeding point 10 along the line of the flange 20 of the metal body,
A first folded line 3b is provided between the first line 3a and the flange in parallel with the first line 3a.
The ends of the a and 3b on the side distant from the feeding point were connected to form a substantially U-shape.

As the second element 4, a second wire 4a is formed along the line of the flange 20 of the window frame of the metal body from the second feed point 11 in the same direction as the first wire 3a. A second folded line 4b is provided at a position opposite to the first line 3a with the second line 4a as a center line, and each of the second line 4a and the second folded line 4b is provided. The ends of the filaments on the side remote from the second power supply point 11 were connected to form a substantially U-shape.

An inner conductor 12a and an outer conductor 12b of the coaxial cable 12 are connected to the two feeding points 10 and 11, respectively.

The first filament 3a of the first element 3
Is preferably 40 to 60 mm, depending on the mounting angle and the bandwidth of the glass plate 1.
The preferred length of b is 60-90 mm.

The distance between the first wire 3a and the first folded wire 3b is 10 to 30 mm, and the distance between the first folded wire 3b and the end of the line of the flange 20 of the metal body is 5 mm. -20 mm is desirable.

Next, the preferable length of the second filament 4a of the second element 4 is 100 to 300 mm, although it depends on the mounting angle and the bandwidth of the glass plate 1, and the preferable length of the second folded filament 4b is preferable. The length is around 20 to 100 mm.

The distance between the second wire 4a and the second folded wire 4b is 10 to 50 mm.
It is desirable that the distance between the end of the line and the flange 20 of the metal body be 10 to 70 mm.

The first folded wire 3b and the flange 20
The reason why the distance between the second wire 4a and the flange 20 is within this range is that when the two wires 3b and 4a are separated from the flange 20, the heating wire 8 for anti-fogging is often used. And other antennas 6 and 7 such as a TV and a radio, and the antenna gain may be reduced due to capacitive coupling, and the wires 3b and 4a may be too close to the body flange 20. The VSWR characteristic may be unstable due to the influence of the body flange 20.

The element and the flange 2 of the metal body
Although not shown, a sponge-shaped dam rubber is provided on the flange 20 of the metal body and the glass plate 1 is adhered with an adhesive, but the first folded point is located near the first feeding point 10. The end of the line between the filament 3b and the flange 20 of the metal body is in the closest state.

On the lower side of the glass plate 1, the second filament 4a comes closest to the tip of the flange portion.

Using the antenna pattern 2 as a basic pattern, as shown in FIG. 3, an auxiliary element for adjusting impedance characteristics from at least one or both of the first and second feeding points 10 and 11. 5a may be provided to improve impedance characteristics.

For example, the auxiliary element is a feed point 1
Branching from the middle of the second element 4 connected to 1;
You may make it arrange | position as shown by the code | symbol 5a '.

Further, as shown in FIGS. 4 and 5, the auxiliary elements 5b and 5c provided from each of the above-mentioned power feeding points, or the parts branched from the middle of the second filament 4a are arranged as auxiliary elements. The auxiliary element 5c 'of 5 or the shape of the auxiliary element may be T-shaped or L-shaped as shown by 5b' in FIG.

Further, as shown in FIG. 5, the auxiliary element may be a folded line, such as a reference numeral 5c ", which is folded back from the tip of the second folded line 4b and disposed. May be provided on the first folded line 3b.

Each of the auxiliary elements 5a'5b'5
c, 5c 'and 5c "were arranged substantially parallel along the first filament 3a or the second filament 4a.

Further, the auxiliary element is provided so as not to cross other filaments.

The glass antenna 2 of the present invention is provided at the upper and lower corners of the rear window glass of a moving body such as an automobile or a vehicle.
However, the present invention is not limited to this as long as it is a peripheral part close to. Further, it may be provided on a side window glass, a front window glass, or the like.

The first filament 3a of the first element 3, the first folded filament 3b, and the second filament 4 of the second element 4
Each of the wire 4a and the second folded wire 4b has a shape arranged substantially parallel to the line of the flange 20 of the window frame of the metal body, and is provided clockwise or counterclockwise.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view in which the glass antenna of the present invention is provided on a rear window glass for an automobile, and FIGS. 2 to 5 are detailed front views of main parts showing an antenna part in Examples 1 to 4 of the present invention. Show. 6 and 7 show a frequency characteristic diagram of an antenna gain and a frequency characteristic diagram of a VSWR (voltage standing wave ratio) in the 800 MHz band and the 1500 MHz band of the glass antenna in the first embodiment. 8 and 9 show the 800 MHz band of the glass antenna of the second embodiment, and FIG.
FIG. 2 shows a frequency characteristic diagram of an antenna gain and a frequency characteristic diagram of a VSWR (voltage standing wave ratio) in a 0 MHz band.
10 and 11 show a frequency characteristic diagram of the antenna gain and a frequency characteristic diagram of the VSWR (voltage standing wave ratio) of the glass antenna in the 800 MHz band and the 1500 MHz band in the third embodiment, respectively. 800 MHz band of the glass antenna in the fourth embodiment, 15
A frequency characteristic diagram of the antenna gain in the 00 MHz band,
FIG. 4 shows a frequency characteristic diagram of the VSWR (voltage standing wave ratio). [Embodiment 1] As shown in FIG. 2, an antenna provided on a glass surface to be mounted on a lower left corner of a rear window of an automobile or the like when viewed from the outside of the vehicle, which is a basic pattern of the glass antenna 2 of the present invention. is there.

As the first element 3, the first feed point 10 is formed along the line of the flange 20 of the window frame of the metal body.
A first filament 3a extending more counterclockwise is provided.
First line 3a between the line 3a and the line of the flange 20
A first folded line 3b is provided in parallel with the first line, and the ends of the lines 3a and 3b on the side remote from the feeding point are connected to each other to form a substantially U-shape.

Further, the second element 4 provided in parallel with the first filament 3a and on the center side of the glass plate extends from the second feed point 11 along the line of the flange 20 of the window frame of the metal body. And a second folded line 4b is provided at an inner position opposite to the first line 3a with the second line 4a as a center line, and a second line 4a is provided. Ends of the side of each of the 4a and the second folded line 4b on the side remote from the second feeding point 11 were connected to form a substantially U-shape.

An inner conductor 12a and an outer conductor 12b of the coaxial cable 12 are connected to the two feeding points 10 and 11, respectively.

The length of each line is as follows.

First element 3 First filament 3a = 50 mm, first folded filament 3b = 8
0 mm, the distance between the first filament 3a and the first folded filament 3b = 20 mm, the minimum distance between the first filament 3a and the line tip of the flange 20 of the metal body = 10 mm second element 4 second Line 4a = 250 mm, second folded line 4b =
50 mm, the distance between the second wire 4a and the second folded wire 4b = 30 mm, and the minimum distance between the second wire 4a and the line tip of the flange 20 of the metal body = 20 mm. The surface of the plate was screen-printed with a conductive paste and fired to form a window glass with an antenna.

After the window glass 1 is mounted on the rear opening of a vehicle or the like, the end of the first element 3 is connected to the first power supply point 10 and the end of the second element 4 is connected to the second power supply. Point 1
1, the inner conductor 12a of the coaxial cable 12
And the external conductor 12b.

The glass antenna 2 in which the first element 3 and the second element 4 are arranged as described above.
From 810 MHz to 960 MHz, and 1240 to 15
Tuning was performed so that the transmission / reception gain in the vertical polarization of the 10 MHz car telephone band was increased.

As shown in FIGS. 6A and 6B, the gain ratio when the transmission / reception gain of the conventional attached antenna for a mobile phone is set to 0 dB (hereinafter simply referred to as the conventional antenna ratio). , +3.1 dB on average in 800 MHz band, 1
The average in the 500 MHz band was +1.6 dB, which is a good result exceeding the transmission / reception gain of the glass antenna used in the conventional practical use.

When a frequency characteristic diagram of the VSWR of this antenna was measured, it was found that the frequency was 800 MHz as shown in FIG.
It is 2.0 or less in the z band and 1.6 or less in the 1500 MHz band, and it can be seen that the band can be practically used in both bands. [Example 2] When the rear window glass is viewed from the outside of the vehicle, as shown in FIG. 3, the first element 3 has substantially the same configuration as that of the first embodiment, and the second element 4 has the same configuration as that of the first embodiment. In addition, the second feeding point 11 and the second feeding point 11
Auxiliary elements 5a, 5a 'for impedance adjustment are provided at positions near the second feed point 11 of the filament 4a, respectively.
0, second feeding point 11, first filament 3a, second filament 4
After being detoured so as not to intersect with a, it was arranged so as to be substantially parallel to the second filament 4a.

The length of each line in the second embodiment is as follows.

First element 3 First filament 3a = 50 mm, first folded filament 3b = 8
0 mm, distance between the first filament 3a and the first folded filament 3b = 20 mm, minimum distance between the first filament 3a and the tip of the line of the flange 20 of the metal body = 23 mm second element 4 second Line 4a = 250 mm, second folded line 4b =
75 mm, the distance between the second wire 4a and the second folded wire 4b = 30 mm, the minimum distance between the second wire 4a and the end of the line of the flange 20 of the metal body = 45 mm, the auxiliary element 5a = the second 8m clockwise from feeding point
m, 23 mm in a direction perpendicular to the tip, and 29 mm counterclockwise from the tip. Auxiliary element 5 a ′ = 42 mm, Auxiliary element 5
Distance between a 'and second filament 4a = 6 mm The antenna 1 of the present invention was screen-printed on the surface of the glass plate 1 with a conductive paste and fired to form a window glass with an antenna.

The first element 3, the second element 4, and the auxiliary elements 5a, 5a 'are arranged as described above, 810 MHz to 960 MHz, and 1420
Tuning was performed so that the transmission / reception gain in vertical polarization of the automobile telephone band of １５1510 MHz was the highest.

Such a glass antenna for a vehicle 80
The frequency characteristics of the antenna gains of the 0 MHz band and the 1500 MHz band were measured, and the ratio was 810 to 96 in terms of the conventional antenna ratio.
In the 0 MHz band, it is as shown in FIG. 8A, and the average is +2.5 dB.

FIG. 8 (b) shows the result in the band of 1240 to 1510 MHz, and the average is + 2.6d.
B.

As described above, good results were obtained that exceeded the transmission / reception gain of the conventional glass antenna used for practical use.

The VSW of the glass antenna of this embodiment is
When the frequency characteristic diagram of R is measured, it is as shown in FIG. 9, and it is understood that the frequency characteristic is 1.8 or less in both the 800 MHz band and the 1500 MHz band, so that it is practically usable. [Embodiment 3] As shown in FIG. 4, an antenna 2 provided on a glass surface mounted on a lower right corner of a rear window glass 1 of an automobile or the like as viewed from outside the vehicle, a first element 3 and a second element The element 4 has the basic pattern portion of the first embodiment.
Is inverted. That is, the first filament is clockwise from each of the first feeding points 10 and the second feeding points 11,
The second filament extends, and the first filament extends counterclockwise from each tip.
Are connected to the second folded wire 3b and the second folded wire 4b.

Further, in addition to the second element 4, an auxiliary element 5b for impedance adjustment is provided from the second feed point 11, and an auxiliary element for impedance adjustment is provided from an intermediate portion of the second wire 4a. Element 5
b ′ was provided.

The auxiliary element 5b is obtained by slightly withdrawing the auxiliary element 5b counterclockwise from the second power supply point, and extending the tip in the horizontal direction. The auxiliary element 5b 'has a T-shape extending from the second feeding point at about 50 mm clockwise from a position about 50 mm in length, providing a horizontal line about 10 mm, and extending 50 mm clockwise and 32 mm counterclockwise from the tip. .

The length of each line in the third embodiment is as follows.

The first element 3 has a first filament 3a =
50 mm, first folded line 3b = 70 mm, distance between first line 3a and first folded line 3b = 20 mm, minimum distance from first line 3a to the end of line of flange 20 of metal body Distance = 22 mm The second element 4 has a second filament 4a = 220 mm,
Second folded line 4b = 30 mm, interval between second line 4a and second folded line 4b = 30 mm, second line 4
Minimum distance between a and the end of the line of the metal body flange 20 = 46 mm Auxiliary element 5b = 7 counterclockwise from the second feeding point
mm, 24 mm horizontally from the tip Auxiliary element 5b '= 10 mm horizontal filament, T-shaped extending 50 mm clockwise and 32 mm counterclockwise from the tip.

The antenna 1 of the present invention was screen-printed on the surface of the glass plate 1 with a conductive paste and fired to form a window glass with an antenna.

The first element 3, the second element 4, and the auxiliary elements 5b, 5b 'are arranged as described above,
Tuning was performed so that the transmission and reception gain in the vertically polarized wave of the 1510 MHz car telephone band was the highest.

The glass antenna 80 for such a vehicle is shown in FIG.
The frequency characteristics of the antenna gains of the 0 MHz band and the 1500 MHz band were measured, and the ratio was 810 to 96 in terms of the conventional antenna ratio.
In the 0 MHz band, the result is as shown in FIG. 10A, and the average is +1.9 dB.

FIG. 10B shows the result in the band of 1240 to 1510 MHz, and the average is +1.5.
dB.

As described above, good results were obtained that exceeded the transmission and reception gains of the conventional practically-used attached antenna.

The VSW of the glass antenna of this embodiment is
When the frequency characteristic diagram of R is measured, it is as shown in FIG. 11, and it is understood that the frequency characteristic is less than 2 in both the 800 MHz band and the 1500 MHz band, and that it can be used practically. [Embodiment 4] FIG. 5 shows an antenna provided at the lower left portion of a window glass when viewed from outside of a vehicle. As a first element 3, a first feed point 10 is provided along a flange line 20 of a metal body. A first filament 3a extending in a counterclockwise direction is provided, and a first folded filament 3b is provided between the first filament 3a and the flange in parallel with the first filament 3a. 3b were connected to each other on the side remote from the feeding point to form a substantially U-shape.

Further, in addition to the present configuration, an auxiliary element 5c for impedance adjustment is provided in parallel with the first wire from the first feed point 10 between the first wire 3a and the first folded wire 3b. Provided.

Further, the second element 4 provided in parallel with the first filament 3a and on the center side of the glass plate extends from the second feeding point 11 along the line of the flange 20 of the window frame of the metal body. And a second folded line 4b is provided at an inner position opposite to the first line 3a with the second line 4a as a center line, and a second line 4a is provided. Ends of the side of each of the 4a and the second folded line 4b on the side remote from the second feeding point 11 were connected to form a substantially U-shape.

Further, an auxiliary element 5c 'is provided from the second feeding point 11 along the second wire 4a, and an auxiliary element 5c "for impedance adjustment is further provided from the tip of the second folded wire 4b. It was provided.

The inner conductor 12a and the outer conductor 12b of the coaxial cable 12 are connected to the two feeding points 10 and 11, respectively.

The length of each line is as follows.

The first element 3 has a first filament 3a =
55 mm, first folded line 3b = 70 mm, distance between first line 3a and first folded line 3b = 15 mm, minimum distance between first line 3a and the end of line of flange 20 of metal body Distance = 15 mm First auxiliary element 5c = 20 mm (The distance between the first auxiliary element 5c and the first filament 3a is 8 mm, the first
The distance between the auxiliary element 5c and the first folded line 3b was 7 mm. The second element 4 has a second filament 4a = 200 mm,
Second folded line 4b = 80 mm, interval between second line 4a and second folded line 4b = 20 mm, second line 4
a = minimum distance between a and the end of the line of the metal body flange 20 = 20 mm Second auxiliary element 5c ′ = 40 mm (second filament 4
a, 10 mm apart and parallel to each other, and provided near the center of the glass plate from the second filament. ) Furthermore, the auxiliary element 5c ″ is 10 m from its tip.
Through the position from the center of the m glass plate, a folded back line is provided, and its length is 30 mm.

The antenna of the present invention was screen-printed on the surface of the glass plate 1 with a conductive paste and fired to form a window glass with an antenna.

After such a window glass 1 is mounted on the rear opening of the vehicle or the like, the end of the first element 3 is connected to the first power supply point 10 and the end of the second element 4 is connected to the second power supply. Point 1
1, the inner conductor 12a of the coaxial cable 12
And the external conductor 12b.

The glass antenna 2 in which the first element 3 and the second element 4 are arranged as described above.
From 810 MHz to 960 MHz, and 1240 to 15
Tuning was performed so that the transmission / reception gain in the vertical polarization of the 10 MHz car telephone band was increased.

FIGS. 12 (a) and 12 (b) show the gain ratio when the transmission / reception gain of the conventional pasted antenna for a car telephone is set to 0 dB (hereinafter simply referred to as the conventional antenna ratio).
As shown in the figure, the average of the 800 MHz band is +2.9 dB,
The average in the 1500 MHz band was +1.7 dB, which is a good result exceeding the transmission / reception gain of the conventional glass antenna used for practical use.

Further, when the frequency characteristic diagram of the VSWR of this antenna was measured, it was as shown in FIG.
It is 1.8 or less in the 0 MHz band and 1.6 or less in the 1500 MHz band, which indicates that both bands can be used practically.

As described above, good results were obtained that exceeded the transmission and reception gains of the conventional practically used glass antenna.

Although the preferred embodiments have been described above, the present invention is not limited to these embodiments, and various applications are possible.

The width of the first element, the second element and the auxiliary element is 0.3 to 5 m.
m, preferably in the range of 0.5 to 3 mm, has the effect of improving the gain for radio waves of a wide range of frequencies, and can be a high-bandwidth antenna.

The antenna of the present invention may be provided on a front window glass, a side window glass, or the like, in addition to the heating wire lower margin portion and the upper margin portion of the rear window glass.

Also, personal radio, business radio, PH
The present invention can also be suitably used for transmitting and receiving radio waves in the ultrahigh frequency band such as S.

The auxiliary element may be provided at one or both of the first and second feeding points. The position of the feeding point is limited depending on the type of vehicle, and the impedance is determined by the length of the lead wire. When the characteristics are insufficient, for example, it may be provided as needed to improve this, and it is not always necessary to provide it at a plurality of locations.

Although the glass antenna of the present invention can be used alone, a glass antenna provided in the upper margin and lower margin of the heating wire of the rear window glass, a glass antenna provided in the front window glass, When diversity reception is performed in combination with a glass antenna or a pole antenna provided on the side window glass, more preferable results can be obtained.

[0081]

According to the glass antenna of the present invention, 810 to 960 M
Hz and the radio waves of both the frequencies of 1420 to 1510 MHz are preferably transmitted and received, and the deviation of the impedance characteristic is reduced by 2
By the auxiliary element provided at the feeding point of one element, near the feeding point of each line, in the middle of each line or at the end thereof,
By adjusting and improving the impedance characteristic, the impedance of the antenna can be approximated to the characteristic impedance of the transceiver and the coaxial cable over a wide band. As a result, a high gain can be obtained in both the 800 MHz band and the 1500 MHz band. It is particularly suitable as a transmitting / receiving antenna of ultra high frequency such as a car phone, a mobile phone, a personal radio, a commercial radio, a PHS, etc. having an antenna performance, and it improves the antenna performance to a practical level.
F-band TV broadcast waves can also be suitably received.

Further, the wire of the two antenna elements and the folded wire are connected to the flange 2 of the window frame of the metal body.
Since the antenna pattern is provided along the zero line, a very compact pattern can be obtained as compared with a conventional antenna pattern in which vertical and horizontal lines are combined.

[Brief description of the drawings]

FIG. 1 is a front view in which a glass antenna of the present invention is provided on a rear window glass for an automobile.

FIG. 2 is a detailed front view of a main part showing an antenna part according to the first embodiment of the present invention.

FIG. 3 is a detailed front view of a main part showing an antenna part according to a second embodiment of the present invention.

FIG. 4 is a detailed front view of a main part showing an antenna part according to a third embodiment of the present invention.

FIG. 5 is a detailed front view of a main part showing an antenna part according to a fourth embodiment of the present invention.

FIG. 6 shows 800M of the glass antenna according to the first embodiment of the present invention.
FIG. 4 is a frequency characteristic diagram of an antenna gain in a Hz band and a 1500 MHz band.

FIG. 7 is a VSWR of the glass antenna according to the first embodiment of the present invention.
FIG. 9 is a frequency characteristic diagram of (voltage standing wave ratio).

FIG. 8 shows a 800M glass antenna according to a second embodiment of the present invention.
FIG. 4 is a frequency characteristic diagram of an antenna gain in a Hz band and a 1500 MHz band.

FIG. 9 shows a VSWR of the glass antenna according to the second embodiment of the present invention.
FIG. 9 is a frequency characteristic diagram of (voltage standing wave ratio).

FIG. 10 shows a glass antenna 800 according to a third embodiment of the present invention.
FIG. 4 is a frequency characteristic diagram of an antenna gain in a MHz band and a 1500 MHz band.

FIG. 11 shows a VSW of the glass antenna according to the third embodiment of the present invention.
The frequency characteristic figure of R (voltage standing wave ratio).

FIG. 12 shows a glass antenna 800 according to a fourth embodiment of the present invention.
FIG. 4 is a frequency characteristic diagram of an antenna gain in a MHz band and a 1500 MHz band.

FIG. 13 shows a VSW of the glass antenna according to the fourth embodiment of the present invention.
The frequency characteristic figure of R (voltage standing wave ratio).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass plate 2 Antenna of this invention 3 1st element 3a 1st line 3b 1st folded line 4 2nd element 4a 2nd line 4b 2nd folded line 5 Auxiliary element 6 TV reception Antenna for radio 7 antenna for radio reception 8 heating wire for anti-fog 10 first feeding point 11 second feeding point 12 coaxial cable 20 flange of metal body

Claims (5)

[Claims] 1. A glass antenna disposed on a window glass of a moving body such as an automobile, wherein a first wire extending clockwise or counterclockwise from a first feeding point along a metal window frame line is provided. Between the first line and the window frame in parallel with the first line.
And a first element formed by connecting the tips of the respective wires remote from the feeding point in a substantially U-shape, and a second element in the same direction as the first wire. A second line is provided along the metal window frame line from the feeding point of the second line, and a second folded line is provided at a position opposite to the first line with the second line as a center. A second element formed by connecting the distal ends of the filaments and the second folded filaments on the side remote from the power supply point in a substantially U-shape, wherein the first power supply point and the second A glass antenna for a vehicle, wherein an inner conductor and an outer conductor of a coaxial cable are connected to each of the two feeding points. 2. The power supply point or a first power supply point connected to the power supply point.
2. The glass antenna for a vehicle according to claim 1, wherein an auxiliary element for adjusting impedance characteristics is provided by branching off from the middle of the second element. 3. A folded wire as an auxiliary element for adjusting an impedance characteristic is disposed again at an end of the first folded wire or the second folded wire as an auxiliary element. 2. The glass antenna for vehicles according to 2. 4. The glass antenna for a vehicle according to claim 2, wherein said auxiliary element comprises a first wire or a wire arranged substantially in parallel along the second wire. . 5. The length of the first filament of the first element is 40-60 mm, and the length of the first folded filament is 60-9.
0 mm, the folded width is 10 to 30 mm, the distance between the first folded line and the window frame is 5 to 20 mm, and the length of the second line as the second element is 100 to 300 mm.
The length of the folded line is 20 to 100 mm, and the folded width is 1
0 to 50 mm, the distance between the second filament and the window frame is 10 to 7
The vehicle glass antenna according to claim 1, wherein the glass antenna is 0 mm.