JPH06303025A - Frequency changeover glass antenna - Google Patents

Abstract

PURPOSE:To provide a frequencies changeover glass antenna which is used for two frequencies and arranged in a space nearly equal to that of a monopole antenna. CONSTITUTION:One-side ends 2a, 3a of a 1st radiation pattern 2 and a 2nd radiation pattern 3 long longitudinally and whose length differs from each other are made approached and the patterns 2, 3 are arranged nearly in a V-shape in the vertical direction of a window glass W, a relay pattern 4 is arranged in a spaces S formed between one-side ends of both the patterns, and a ground pattern 5 long in the longitudinally and laterally is arranged to the lower part of the relay pattern 4. Then one end of either of the radiation patterns and the relay pattern are short-circuit by a jumper 7. Moreover, a feeding cable 6 is connected between the relay pattern and the ground pattern. Through such a constitution, either of two kinds of frequencies is changed over through jumper connection change while the feeding cable is left connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a glass antenna arranged mainly on a window glass of a vehicle.

[0002]

2. Description of the Related Art A window glass antenna filed by the present applicant as an example of a conventional window glass antenna (Japanese Patent Application No. 4-386).
No. 28) is shown in FIG. In this window glass antenna 100, a radiation pattern 101 is arranged in the vertical direction of a glass surface, and a grounding pattern 102 having a hollow shape is arranged below. Then, the core wire of the feeding coaxial cable is connected to the lower end portion 101a of the radiation pattern 101, and the upper end central portion 102 of the grounding pattern 102 is connected.
The braided wire of the power feeding coaxial cable was connected to a, and the other end of this cable was connected to the antenna terminal of a car telephone device or a radio.

Since the antenna is formed on the glass surface as described above, the projection like the whip antenna is eliminated, and the air resistance during running of the vehicle can be reduced. It was also suitable in terms of improving the appearance.

[0004]

However, since the window glass antenna 100 is a so-called monopole antenna (antenna for a single frequency), another set of antennas must be prepared in order to use it at different frequencies. .
However, arranging two sets of monopole antennas on one window glass requires double the space. Therefore, an object of the present invention is to provide a frequency switchable glass antenna which can be used at two frequencies and can be arranged in a space similar to a monopole antenna.

[0005]

In order to solve the above problems, according to the present invention, one ends of a first radiation pattern and a second radiation pattern having different lengths are made to be close to each other, and the first radiation pattern and the second radiation pattern are arranged substantially in the vertical direction of the glass surface. The relay pattern is arranged in a V shape, the relay pattern is disposed in a space sandwiched between the ends of the two radiation patterns, and the ground pattern is disposed below the relay pattern. One end of any one of the radiation patterns and the relay pattern were short-circuited.

One ends of the first radiation pattern and the second radiation pattern having different lengths are arranged close to each other in the vertical direction of the glass surface, and in the space sandwiched between the one ends of the two radiation patterns. A relay pattern is provided, and a ground pattern is provided below the relay pattern,
One of the two radiation patterns is extended from the other end to short-circuit the ground pattern, and one of the two radiation patterns is connected to the relay pattern. It may be short-circuited.

The length of the first radiation pattern is about (1/4) λ1 with respect to the first wavelength λ1, and the length of the second radiation pattern is about (1) with respect to the second wavelength λ2. 1/5)
λ2 to about (1/4) λ2, and the vertical length of the ground pattern is about (1/4) λ1 to about (1 /).
4) λ2, and the length of the grounding pattern in the left-right direction may be about (1/4) λ2 to about (3/4) λ1.

The radiation pattern or the ground pattern may have a hollow shape.

[0009]

Since the switching between the two radiation patterns is performed by reconnecting the jumper wires between the radiation pattern and the relay pattern, the work efficiency is improved as compared with the case where the power feeding cable is reconnected. On the other hand, since the grounding pattern is shared, the only difference from the conventional monopole antenna is the addition of one radiation pattern and one relay pattern of different lengths. Therefore, it becomes possible to dispose the glass antenna in a relatively narrow space like that of a monopole antenna.

If one radiation pattern is extended from the other end and shorted with the grounding pattern, these two patterns can be integrally molded. Therefore, the number of man-hours for pattern molding can be reduced by one.

By setting the dimensions of the radiation pattern and the ground pattern under certain conditions, it is possible to obtain frequency characteristics comparable to those of a monopole antenna.

The visibility can be improved by forming the radiation pattern or the ground pattern into a hollow shape.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, 800MHz band and 1.5G
The antenna for the Hz band will be described, but the frequency is not limited to these frequencies.

FIG. 1 is an antenna pattern diagram of a first embodiment of a frequency switching type glass antenna according to the present invention. First
The embodiment corresponds to the invention of claim 1. The frequency-switching glass antenna 1 is configured such that one ends 2a and 3a of a first radiation pattern 2 and a second radiation pattern 3 having different lengths and different lengths are brought close to each other, and are substantially vertical to a rear window glass W of a vehicle or the like. V
A triangular relay pattern 4 is arranged in a space S formed between the two ends 2a, 3a of the two radiation patterns 2, 3 below the relay pattern 4. A grounding pattern 5 is provided. As will be described later, F2 and F3 on the first and second radiation patterns 2 and 3 are feeding points,
F4 on the relay pattern 4 side is a relay point and a ground pattern 5
E5 on the side is a grounding point.

The first radiation pattern 2 is at an angle of 30 degrees clockwise with respect to the vertical axis D of the glass, and the second radiation pattern 3 is at 30 degrees counterclockwise with respect to the vertical axis D. I set it in degrees. The angle is not limited to 30 degrees, and the patterns 2 and 3 may be set to different angles.

FIG. 2 is a block diagram showing the vicinity of the feeding point of the glass antenna 1. Lower end 2 of the first radiation pattern 2
The feeding point F2 is located near a, the feeding point F3 is located near the lower end 3a of the second radiation pattern 3, the feeding point F4 is located at the center of the relay pattern 4, and the upper end center E5 of the grounding pattern 5 is provided. Each is provided with a grounding point.

First, the core wire of the power feeding coaxial cable 6 is connected to the relay point F4, and the braided wire 6b of the coaxial cable 6 is connected to the upper end central portions 5a, 5a of the grounding pattern 5 by soldering or the like.

Next, when an antenna is connected to the second radiation pattern 3 side, a conductive wire such as a copper wire is provided between the feeding point F3 of the second radiation pattern 3 and the relay point F4 of the relay pattern 4. Short-circuited by the jumper wire 7 made of a member. In this case, the resonance frequency is determined by the length of the second radiation pattern 3. The other end of the cable 6 is connected to an antenna terminal of a car telephone device or a radio (not shown).

Similarly, when switching the antenna to the first radiation pattern 2 side, the jumper wire 7 is connected between the feeding point F2 of the first radiation pattern 2 and the relay point F4 of the relay pattern 4. You can change it. By this reconnection, the resonance frequency is switched to the frequency determined by the length of the first radiation pattern 2.

That is, according to this structure, one antenna can be used at two different frequencies, and it is not necessary to reconnect the coaxial cable 6 when switching the antenna. Therefore, the work efficiency can be improved, for example, the coaxial cable 6 can be attached in advance before the frequency switching work.

On the other hand, since the grounding pattern 5 is shared, the only difference from the conventional monopole antenna is that the radiation pattern 2 or 3 and the relay pattern 4 are added. Therefore, it is possible to dispose in a relatively narrow space like a monopole antenna.

FIG. 3 shows a second frequency switching type glass antenna.
It is the elements on larger scale of an example. The second embodiment uses a connector type jumper wire 8 instead of the jumper wire 7 of the first embodiment. The connector type jumper wire 8 is composed of a conductive member 8a such as a copper wire, and a triangular plug 8b and a rectangular plug 8c connected to both ends of the conductive member 8a. A jack (not shown) that can be attached to and detached from the plug 8b is provided near the feeding point F4 of the relay pattern 4, and a jack (not shown) that is selectively attachable to and detachable from the plug 8c is the radiation pattern 2. , 3 feeding point F
2, provided near F3.

When the plugs 8b and 8c are fitted into the jack, the corners k1 to k7 of the plugs 8b and 8c and the patterns 2 to 4 are soldered to make it difficult to remove them.
However, when it is difficult to separate the plugs 8b and 8c from the jack, soldering may be omitted. The connection of the coaxial cable 6 is the same as in the first embodiment.

By using the connector type jumper wires in this way, the work of attachment and detachment can be facilitated, and for example, this work can be carried out at the shop side.

FIG. 4 shows a third frequency-switching type glass antenna.
It is an antenna pattern figure of an example. The third embodiment corresponds to the invention of claim 2. Frequency switchable glass antenna 1
1 is arranged on the rear window glass W of a vehicle or the like, with the ends 12a of the arc-shaped first radiation pattern 12 and the vertically long second radiation pattern 13 being close to each other so as not to contact each other.
One end 12 of the two radiation patterns 12 and 13
A rectangular relay pattern 14 is arranged in a space S sandwiched by a and 13a, and a ground pattern 15 is arranged below the relay pattern 14.

Further, the first radiating pattern 12 is formed with an extending portion 12c extending from the other end 12b toward the grounding pattern 15, and the extending portion 12c is short-circuited with the grounding pattern 15. is doing.

The first and second radiation patterns 1 are also provided.
F12 and F13 on the 2 and 13 side are feeding points, F14 on the relay pattern 14 side is a relay point, and E1 on the ground pattern 15 side.
5 is a grounding point.

FIG. 5 is a block diagram of the vicinity of the feeding point of the glass antenna 11. The feed point F13 of the second radiation pattern 13 and the relay point F14 of the relay pattern 14 are short-circuited by a jumper wire 7 using a conductive member such as a copper wire, and the feed coaxial cable 6 is connected to the relay point F14. The core wire of
The braided wires 6b of the coaxial cable 6 were connected to the upper ends 15a and 15a of the ground pattern 15 by soldering or the like. The other end of the cable 6 is connected to an antenna terminal of a car telephone device or a radio (not shown). In this case, the resonance frequency is determined by the length of the second radiation pattern 13.

On the other hand, when the jumper wire 7 is reconnected between the feeding point F12 of the first radiation pattern 12 and the relay point F14 of the relay pattern 14, the length of the first radiation pattern 12 is changed. Switch to the determined resonance frequency.

That is, according to this configuration, one antenna can be used at two frequencies as in the first embodiment, and
When switching the antenna, it is not necessary to reconnect the coaxial cable 6. Further, since the radiation pattern 12 and the ground pattern 15 are short-circuited, the two patterns 12 and 15 can be integrally molded. Therefore,
The number of pattern molding steps can be reduced by one.

Next, the dimensional relationship of each pattern in the first embodiment will be described. The dimensional relationship of this pattern corresponds to the invention of claim 3. That is, the resonance frequency f (H
Assuming that the wavelength for z) is λ (m), the wavelength is calculated by the following equation.

[0032]

[Formula 1] λ = (c / f) · k

However, c is the speed of light (3 · 10 ⁸ m / se)
c. ), K is the shortening rate (0.6) of the glass antenna in the present embodiment.

According to Equation 1, the wavelength λ1 for 1.5 GHz is 0.12 m. By the way, the length of the first radiation patterns 2 and 12 is about (1/4) of this λ1.
It is set to be λ1. Therefore, the length of the first radiation pattern 2 is set to 30 mm.

Similarly, the wavelength λ2 for 800 MHz is 0.225 m according to the equation (1). By the way, the length of the second radiation pattern 3 is about (1/5) of the second wavelength λ2.
It is set so as to be λ2 to about (1/4) λ2.

Therefore, the length of the second radiation pattern 3 is 6
It was set to 0 mm.

The widths of the first radiation pattern 2 and the second radiation pattern 3 are both 5 mm, and the distance between the radiation patterns 2 and 3 and the ground pattern 5 is 2 m.
set to m.

On the other hand, with respect to the wavelengths λ1 and λ2, the vertical length of the grounding pattern 5 is set to about (1/4) λ1 to about (1/4) λ2, and the horizontal length of the grounding pattern 5 is set. Is set to about (1/4)? 2 to about (3/4)? 1. Therefore, the vertical length of the ground pattern 5 is set to 35 mm, and the horizontal length thereof is set to 60 mm.

FIG. 6 is a frequency characteristic graph for the 800 MHz band of the first embodiment, and FIG. 7 is 1.5 GHz for the first embodiment.
Frequency characteristic graphs for bands, FIGS. 8 and 9 are measurement data (for reference) of the frequency characteristic of the first embodiment.

6 to 9, the 800M standard means that the resonance frequency of the conventional window glass antenna 100 is 80.
0MHz monopole antenna, 1.5G
The standard means a monopole antenna having a resonance frequency of 1.5 GHz among the above-mentioned window glass antennas 100.

Shared (deg = 0) means that the angle of the two radiation patterns is 0 degree, and shared (deg = 15) means that the angle of the two radiation patterns with respect to the vertical axis D is 15 degrees. The common use (deg = 30) means that the angle between the two radiation patterns and the vertical axis D is 30 degrees.

According to FIG. 6, in the 800 MHz band, near the relatively low frequency of 800 MHz, there is little decrease in gain with respect to the standard antenna, and there is little difference in gain due to the angles of both radiation patterns, but the frequency is high. The rate at which the gain gradually decreases becomes larger as it becomes larger. The rate of decrease in this gain is the smallest when the angle is 0 degree (deg = 0), that is, in the case of parallel, followed by 15 degrees (deg = 15), and finally 30 degrees (deg = 30). Therefore, it can be seen that the smaller the angle, the better. However, even at 900 MHz or more, where the decrease in gain is relatively large, about 3 dB (deg =
In the case of 30), it can be said that the range is practically acceptable.

According to FIG. 7, in the 1.5 GHz band, the gain is slightly lower than that of the standard antenna in the vicinity of 1400 MHz where the frequency is relatively low, but the gain is increased in the vicinity of 1500 MHz where the frequency is relatively high. Less drop,
Moreover, there is little difference due to the difference in angle between the two radiation patterns.
Further, the shared (deg = 0) frequency characteristic is closest to that of the standard antenna, and the gain is slightly higher than that of the standard antenna in the vicinity of a low frequency of 1400 MHz. on the other hand,
In the 1.5 GHz band, it cannot be said that the larger the angle between the two radiation patterns is, the larger the decrease in gain is. Therefore, it is difficult to uniformly determine the relationship between the angle and the gain.

According to the above measurement results, 800 MHz
It can be seen that the gain reduction can be suppressed by making the angles of the two radiation patterns in both the band and the 1.5 GHz band as close to 0 degree (that is, parallel) as much as possible. The angle of the radiation pattern may be set arbitrarily, but as a result of the experiment, a relatively good result was obtained in the range of 0 to 30 degrees, and therefore data is shown in this range.

It was also found that the gain changes when the angle formed by both radiation patterns is changed. Therefore, if the relationship between the angle of the radiation pattern and the gain is investigated in advance, the radiation pattern can be arranged at the optimum angle for the target frequency.

That is, by setting the dimensions of the radiation pattern and the ground pattern under the above-mentioned certain conditions, it is possible to obtain frequency characteristics close to those of a monopole antenna.

Next, a modification of the first embodiment will be described. 10 to 13 are antenna pattern diagrams of the fourth to seventh embodiments.

In the fourth embodiment of FIG. 10, the frequency switching type glass antenna 21 has two radiation patterns 22 and 23 arranged in a vertical V-shape and one end of each of the patterns 22 and 23. A triangular relay pattern 24 arranged in a space S sandwiched between 22a and 23a, and a lower side 25a arranged below the relay pattern 24.
A relatively wide grounding pattern 2 having a circular arc shape
It consists of 5 and. The visibility can be improved by arranging the lower side 25a along the lower edge Wa of the rear window glass W and arranging the patterns 22 to 25 at the corners of the window glass W as a whole.

The fifth embodiment of FIG. 11 corresponds to the invention of claim 4 in which the radiation pattern has a hollow shape. The frequency switchable glass antenna 31 includes two radiation patterns 32 and 33 arranged in a vertical V-shape.
A triangular relay pattern 34 disposed in the space S sandwiched between the ends 32a and 33a of the patterns 32 and 33, and a grounding pattern 35 disposed below the relay pattern 34. It consists of and. Furthermore, since the radial patterns 32 and 33 are formed by arranging three thin conductive wires substantially parallel to each other, they have a hollow shape. Therefore, since the radial patterns 32 and 33 are less noticeable, the visibility can be improved.

The sixth embodiment of FIG. 12 corresponds to the grounding pattern of the invention of claim 4 which has a hollow shape. The frequency switching type glass antenna 41 includes two radiation patterns 42, 43 arranged in a vertical V-shape.
And a triangular relay pattern 44 disposed in the space S sandwiched between the ends 42a and 43a of the patterns 42 and 43, and a ground pattern 45 disposed below the relay pattern 44. Consists of. Since the grounding pattern 45 is formed in a hollow shape, it becomes inconspicuous and therefore the visibility can be improved.

The seventh embodiment of FIG. 13 corresponds to the invention of claim 4 in which both the radiation pattern and the grounding pattern are hollowed out. Frequency switchable glass antenna 5
Reference numeral 1 denotes two radiation patterns 52 and 53 arranged in a vertical V-shape and a space S sandwiched between the ends 52a and 53a of the patterns 52 and 53, respectively. Square relay pattern 54 and this relay pattern 5
4 and a grounding pattern 55 having a hollow shape, which is disposed below 4. Furthermore, since each pattern is formed by arranging three thin conductive wires substantially parallel to each other, each pattern itself has a hollow shape. Therefore, both the radiation patterns 52, 53 and the ground pattern 55 are less noticeable, so that the visibility can be improved more than in the fifth or sixth embodiment.

Next, a modification of the second embodiment will be described. 14 to 17 are antenna pattern diagrams of the eighth to eleventh embodiments.

In the eighth embodiment shown in FIG. 14, the frequency-switching type glass antenna 61 has a first radiation pattern 62 having an arc shape and a second radiation pattern 63 having a vertically long end 62a.
63a are brought close to each other, and the two radiation patterns 6 are provided.
A rectangular relay pattern 64 is arranged in a space S sandwiched between the ends 62a, 63a of the second and the third 63, and a grounding pattern 65 is arranged below the relay pattern 64. Further, the other end 62b of the first radiation pattern 62 has an extension 62 extending in the direction of the ground pattern 65.
c is formed, the tip of the extending portion 62c is short-circuited with the grounding pattern 65, and the patterns 62 and 65 are integrated.

On the other hand, the lower side 6 of the ground pattern 65
5a is formed in an arc shape. Therefore, for example, the lower side 65a is aligned with the lower edge Wa of the rear window glass W, and the patterns 62 to 65 are entirely included in the window glass W.
The visibility can be improved by arranging it at the corners.

The ninth embodiment of FIG. 15 corresponds to the invention of claim 4 in which both the radiating and grounding patterns are hollowed out. Frequency switching type glass antenna 71
The ends 72a and 73a of the arc-shaped first radiation pattern 72 and the vertically long second radiation pattern 73 are brought close to each other, and the two ends 7 of the two radiation patterns 72 and 73 are connected to each other.
A rectangular relay pattern 74 is arranged in a space S sandwiched between 2a and 73a, and a ground pattern 75 is arranged below the relay pattern 74. Further, the ground pattern 75 is provided on the other end 72b of the first radiation pattern 72.
An extending portion 72c extending in the direction of is formed, and the tip of the extending portion 72c is short-circuited with the ground pattern 75. Further, the radiation patterns 72 and 73 are formed by arranging three thin conductive wires substantially in parallel, and the ground pattern 75 is formed in a hollow shape, so that the visibility can be improved.

The tenth embodiment of FIG. 16 corresponds to the grounding pattern in the invention of claim 4 which has a hollow shape. The frequency switching type glass antenna 81 has an arc-shaped first
One ends 82a, 83a of the radiation pattern 82 and the vertically elongated second radiation pattern 83 are brought close to each other, and a rectangular relay is provided in the space S sandwiched by the one ends 82a, 83a of the two radiation patterns 82, 83. Arrange the pattern 84,
A grounding pattern 85 is arranged below the relay pattern 84. Further, an extension portion 82c extending in the direction of the ground pattern 85 is formed at the other end 82b of the first radiation pattern 82, and the tip of the extension portion 82c short-circuits with the ground pattern 85. ing. Since the grounding pattern 85 is formed in a hollow shape, it is possible to improve the visibility.

The eleventh embodiment of FIG. 17 corresponds to the invention of claim 4 in which both the radiation pattern and the grounding pattern are hollowed out. The frequency switching type glass antenna 91 includes an arc-shaped first radiation pattern 92 and a vertically long second radiation pattern 92.
One ends 92a, 93a of the radiation pattern 93 are brought close to each other, and a rectangular relay pattern 94 is arranged in a space S sandwiched by the one ends 92a, 93a of the two radiation patterns 92, 93. It is composed of a hollow grounding pattern 95 arranged below the grounding pattern 94. Further, since the patterns 92, 93, and 95 are formed by arranging three thin conductive wires substantially parallel to each other, each pattern itself has a hollow shape. Therefore, the visibility can be improved more than in the ninth embodiment.

In the seventh, ninth and eleventh embodiments, the pattern is formed by three conductive wire rods, but the number of conductive wire rods is three.
It is not limited to books.

[0059]

Since the switching between the two radiation patterns is performed by reconnecting the jumper wire between the radiation pattern and the relay pattern, the work efficiency is improved as compared with the case of reconnecting the power feeding cable. On the other hand, since the grounding pattern is shared, the only difference from the conventional monopole antenna is the addition of one radiation pattern and one relay pattern of different lengths. Therefore, it becomes possible to dispose the glass antenna in a relatively narrow space like that of a monopole antenna.

If one radiation pattern is extended from the other end and shorted with the ground pattern, these two patterns can be integrally molded. Therefore, the number of man-hours for pattern molding can be reduced by one.

By setting the sizes of the radiation pattern and the ground pattern according to certain conditions, it is possible to obtain frequency characteristics close to those of a monopole antenna.

The visibility can be improved by forming the radiation pattern or the grounding pattern in a hollow shape.

[Brief description of drawings]

FIG. 1 is an antenna pattern diagram of a first embodiment of a frequency switching type glass antenna according to the present invention.

FIG. 2 is a configuration diagram in the vicinity of a feeding point of the first embodiment of the frequency switching type glass antenna.

FIG. 3 is a partially enlarged view of a second embodiment of the frequency switching type glass antenna.

FIG. 4 is an antenna pattern diagram of a third embodiment of the same frequency switching type glass antenna.

FIG. 5 is a block diagram of the vicinity of a feeding point of a third embodiment of the same frequency switching type glass antenna.

FIG. 6 is a frequency characteristic graph for the 800 MHz band of the first embodiment of the frequency switching type glass antenna.

FIG. 7 is a frequency characteristic graph for the 1.5 GHz band of the first embodiment of the same frequency switching type glass antenna.

FIG. 8: Measurement data of frequency characteristics for the 800 MHz band of the first embodiment of the same frequency switching type glass antenna.

FIG. 9: Measurement data of frequency characteristics of the same frequency switching type glass antenna for the 1.5 GHz band of the first embodiment.

FIG. 10 is an antenna pattern diagram of a fourth embodiment of the same frequency switching type glass antenna.

FIG. 11 is an antenna pattern diagram of a fifth embodiment of the same frequency switching type glass antenna.

FIG. 12 is an antenna pattern diagram of a frequency switching type glass antenna according to a sixth embodiment.

FIG. 13 is an antenna pattern diagram of a seventh embodiment of the same frequency switching type glass antenna.

FIG. 14 is an antenna pattern diagram of an eighth embodiment of the same frequency switching type glass antenna.

FIG. 15 is an antenna pattern diagram of a ninth embodiment of the frequency switching type glass antenna.

FIG. 16 is an antenna pattern diagram of a tenth embodiment of the same frequency switching type glass antenna.

FIG. 17 is an antenna pattern diagram of the eleventh embodiment of the same frequency switching type glass antenna.

FIG. 18 is an antenna pattern diagram of a conventional window glass antenna.

[Explanation of symbols]

1,11,21,31,41,51,61,71,8
1, 91 ... Frequency switching type glass antenna, 2, 12,
22, 32, 42, 52, 62, 72, 82, 92 ...
First radiation pattern, 3, 13, 23, 33, 43, 5
3, 63, 73, 83, 93 ... Second radiation pattern,
4,14,24,34,44,54,64,74,8
4, 94 ... Relay pattern, 5, 15, 25, 35,
45, 55, 65, 75, 85, 95 ... Grounding pattern, 12c, 62c, 72c, 82c, 92c ... Extending portion, S ... Space, W ... Glass surface.

Claims (4)

[Claims] 1. A first radiation pattern and a second radiation having different lengths.
One ends of the radiation patterns are arranged close to each other and arranged in a substantially V shape in the vertical direction of the glass surface, and a relay pattern is arranged in a space sandwiched between the two ends of the radiation patterns. A frequency switching glass antenna, wherein a grounding pattern is arranged below the relay pattern, and one end of either of the two radiation patterns and the relay pattern are short-circuited. 2. A first radiation pattern and a second radiation having different lengths.
One ends of the radiation patterns are arranged close to each other in the vertical direction of the glass surface, and a relay pattern is disposed in a space sandwiched between the two ends of the two radiation patterns, and below the relay pattern. A grounding pattern is provided, and one of the two radiation patterns is extended from the other end to short-circuit with the grounding pattern.
A frequency-switchable glass antenna, wherein one end of either one of the two radiation patterns and the relay pattern are short-circuited. 3. The length of the first radiation pattern is set to a first length.
Is about (1/4) λ1 with respect to the wavelength λ1 of, and the length of the second radiation pattern is about (1/1) with respect to the second wavelength λ2.
5) λ2 to about (1/4) λ2, the vertical length of the ground pattern is about (1/4) λ1 to about (1/4) λ2, and the left and right of the ground pattern are 2. The frequency switching glass antenna according to claim 1, wherein the length in the direction is about (1/4) [lambda] 2 to about (3/4) [lambda] 1. 4. The frequency switching glass antenna according to claim 1, wherein the radiation pattern or the ground pattern has a hollow shape.