JP3233377B2 - Window glass antenna - Google Patents

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 diversity antenna mainly used for a mobile telephone.

[0002]

2. Description of the Related Art A so-called diversity antenna having a plurality of antennas that resonate at the same frequency and selectively connecting any one of the antennas to a transmitting or receiving device is known.

[0003] Conventional diversity antennas for automobile telephones include, for example, a rod antenna attached to the outside of a vehicle body and provided with two antennas above and below, and two antennas arranged inside a vehicle such as a rear tray and arranged inside a vehicle. Known antenna boxes and the like are known. However, in the case of a rod antenna, a projection is formed outside, and a dedicated space is required to provide an antenna box. Thus, it has been considered that two sets of antenna patterns are arranged on a window glass to form a diversity antenna.

[0004] By the way, in a car telephone, the frequency is 8
Since a very high frequency band (SHF) such as a 00 MHz band is used, it is necessary to dispose both the radiation pattern and the ground pattern on the window glass. Further, since the frequency is as high as about 800 MHz, it is necessary to increase the width of each pattern.

Therefore, two radiation patterns and two ground patterns each having a relatively large width have to be provided.

[0006]

However, an increase in the number of patterns hinders the field of view and requires a relatively large space. Therefore, an object of the present invention is to provide a windowpane antenna that improves visibility and saves space.

[0007]

In order to solve the above-mentioned problems, the present invention provides an antenna pattern comprising a plurality of radiating patterns having different directivity characteristics and a common grounding pattern paired with these radiating patterns. Composing and radiating putter
The pattern consists of a rod-shaped pattern and a horizontal inverted F-shaped pattern.
Was constructed.

[0008] The grounding pattern may be constituted by a horizontal sun-shaped pattern.

[0009]

Since the ground pattern is shared, the number of patterns can be reduced. Further, since the radiation pattern is composed of a plurality of patterns having different directivity characteristics, a diversity effect can be exhibited even when the radiation patterns are brought close to each other. Therefore, the visibility can be improved and the space can be saved.

If the radiation pattern is formed in a bar shape and a horizontal inverted F-shape, the visibility is improved because it is less noticeable. Also, since the directional characteristics can be set in directions different by 90 degrees, the diversity effect can be further improved.

If the grounding pattern is formed in the shape of a horizontal sun, two hollow portions are formed on the left and right sides of the pattern, so that the visibility can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an antenna pattern diagram of a window glass antenna according to the present invention.

Although an 800 MHz band antenna for a mobile phone is described as an example, the present invention is not limited to this, and it can be widely used as a transmitter or receiver antenna in an ultrahigh frequency band.

In FIG . 1, a window glass antenna 1 according to the present invention comprises a vertically long bar-shaped pattern 2, a horizontal inverted F-shaped pattern 3, and a horizontal sun-shaped pattern 4. Of these, the rod-shaped pattern 2 and the horizontal inverted F
The letter-shaped pattern 3 constitutes a radiation pattern, and the lateral day-shaped letter pattern 4 constitutes a grounding pattern. The window glass antenna 1 is disposed, for example, at the lower left of the rear window glass 5.

The bar-shaped pattern 2 is printed substantially perpendicularly to the lower edge 5a of the window glass 5.

The horizontal inverted F-shaped pattern 3 is formed by connecting a horizontally long bar-shaped pattern 3a and vertically long bar-shaped patterns 3b and 3c in an inverted "F" shape (inverted "F" shape).
In addition, the pattern 3 is placed on the lower edge 5a of the window glass.
a is printed substantially parallel, and the patterns 3b and 3c are printed substantially vertically. Further, the lower end 3d of the pattern 3b is short-circuited with the upper left corner 4a of the pattern 4.

The horizontal day-shaped pattern 4 is formed by connecting horizontally long bar-shaped patterns 4b and 4c and vertically long bar-shaped patterns 4d to 4f in a horizontal "day" shape. The patterns 4b and 4c are printed substantially parallel to the lower end portion 5a of the window glass, and the patterns 4d to 4f are printed substantially vertically.

Further, a first feeding point F1 is provided near the lower end 2a of the pattern 2, and a grounding point E1 paired with the first feeding point F1 is provided.
Are provided near the upper end 4g of the pattern 4f. Similarly, a second feeding point F2 is provided near the lower end 3e of the pattern 3c, and a grounding point E2 paired with the second feeding point F2 is provided near the upper end 4h of the pattern 4e.

[0019] On the other hand, the size of each pattern is as follows. First, the width of each pattern is all 4 mm. The length of each pattern is 40 mm for the rod-shaped pattern 2, 60 mm for the 3a, 35 mm for the 3b, 30 mm for the 3c, and 4 for the 3c.
b and 4c are 80 mm, and 4d to 4f are 40 mm. The lower end 2a of the pattern 2 and the pattern 4
The distance between b and the pattern 4b is 5 mm, and the distance between the lower end 3e of the pattern 3c and the pattern 4b is also 5 mm.

The pattern 2 is disposed on an extension of the pattern 4f, the pattern 3c is disposed on an extension of the pattern 4e, and the pattern 4d and the pattern 3b are short-circuited to form a straight line.

[0021] Incidentally, the said bar-like pattern 2 sideways inverted F
The character pattern 3 is set to a length that resonates at the same frequency.

FIG . 2 is a pattern diagram of a window glass antenna and an anti-fog heater wire disposed on the rear window glass. The window glass antenna 1 is provided at a lower left portion L of the rear window glass 5.
It is arranged in. Above the antenna 1, an FM broadcast receiving antenna 7 including a plurality of anti-fog heater wires 6 and a part 6a of the heater wire 6 and an antenna wire 7a is disposed.

FIG . 3 is a diagram showing directivity characteristics of an antenna having the lateral inverted F-shaped pattern 3 (hereinafter, referred to as an F-shaped antenna 3), and FIG. 4 is an antenna having the rod-shaped pattern 2 (hereinafter, referred to as a monopole antenna 2). FIG.

[0024] This characteristic diagram is a measure of the respective antenna alone. That is, each antenna is set up at the center of a circular copper plate having a diameter of 1 m so that the pattern surface is at an angle of 90 degrees with respect to the surface of the copper plate.
It was installed at a height of 3 m, and the gain was measured over 360 degrees at a predetermined angular interval. The measurement was performed with the gain of the standard dipole antenna set to 0 dBμ.

FIG . 3 is a characteristic diagram of the F-shaped antenna 3. This antenna is configured so that the directivity becomes strong in the traveling direction of the vehicle (at an angle of 0 degree) or in the opposite direction (at an angle of 180 degrees).

FIG . 4 is a characteristic diagram of the monopole antenna 2. This antenna is configured so that the directivity becomes stronger in the left-right direction with respect to the traveling direction. That is, the directivity is increased in a direction different from that of the F-shaped antenna 3 by 90 degrees.

According to the above configuration, the antenna 1 can reduce the number of patterns since shared the grounding pattern 4. In addition, since the pattern is formed as a bar-shaped pattern as a whole, it becomes less noticeable. Therefore, it is possible to save space and improve the field of view.

Further , since the radiation pattern is composed of two patterns having different directivities, a diversity effect can be exhibited even when the patterns are close to each other.

The radiation pattern is composed of a horizontal inverted F-shaped pattern and a rod-shaped pattern, so that the directivity can be increased by 9%.
Since the direction can be set to a direction different by 0 degrees, the diversity effect can be further improved. In other words, if a switching device that switches the antenna to the one with the higher receiving sensitivity is provided between the two antennas, it is possible to realize an antenna that saves space and has a high diversity effect.

On the other hand, if different resonance frequencies changing the length of the two radiation antenna patterns 2 and 3, (e.g., length resonating 1.5GHz monopole antenna 2, a F-shaped antenna 3 to 800MHz ) Can be used as a two-frequency switching antenna.

[0031]

The number of patterns can be reduced because the ground pattern is shared. Further, since the radiation pattern is composed of a plurality of patterns having different directivity characteristics, a diversity effect can be exhibited even when the radiation patterns are brought close to each other. Therefore, the visibility can be improved and the space can be saved.

Since the radiation pattern is formed in the shape of a bar and in the shape of an inverted F in the horizontal direction, the pattern is less noticeable, so that the visibility can be improved. Also, since the directional characteristics can be set in directions different by 90 degrees, the diversity effect can be further improved.

If the grounding pattern is formed in the shape of a horizontal sun, two hollow portions are formed on the left and right sides of the pattern, so that the visibility can be improved.

[Brief description of the drawings]

FIG. 1 is an antenna pattern diagram of a window glass antenna according to the present invention.

FIG. 2 is a pattern diagram of a window glass antenna and an anti-fog heater wire disposed on a rear window glass.

FIG. 3 is a diagram showing directivity characteristics of a horizontally inverted F-shaped pattern antenna.

FIG. 4 is a diagram showing directivity characteristics of a rod-shaped pattern antenna;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 window glass antenna 2 bar-shaped pattern 3 horizontal inverted F-shaped pattern 4 horizontal day-shaped pattern 5 rear window glass

────────────────────────────────────────────────── ─── Continued from the front page (56) References JP-A-3-10404 (JP, A) JP-A-6-303025 (JP, A) JP-A-5-226919 (JP, A) JP-A-5-226919 63425 (JP, A) JP-A-4-347910 (JP, A) JP-A-4-314202 (JP, A) JP-A-5-82113 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01Q 1/32

Claims (2)

(57) [Claims] In a window glass antenna having an antenna pattern disposed on a window glass, the antenna pattern includes a plurality of radiation patterns having different directivity characteristics and a common ground pattern paired with the radiation patterns. The radiation pattern is composed of a bar-shaped pattern and a horizontal inverted F-shaped pattern.
Window glazing characterized by being formed with a pattern of shapes
Antenna. 2. The grounding pattern according to claim 1, wherein the grounding pattern is a horizontal character pattern.
The window according to claim 1, wherein the window is constituted by turns.
Glass antenna.