JP5499810B2 - Glass antenna for vehicle and window glass for vehicle - Google Patents

Description

  The present invention relates to a glass antenna for a vehicle and a window glass for a vehicle.

  A general configuration of a monopole glass antenna is a configuration in which an antenna conductor is provided on a window glass, and a feeding portion of the antenna conductor and an amplifier provided on the vehicle body side are connected by an AV line. However, for example, when receiving terrestrial digital television broadcasting (Japan: 470 to 770 MHz, the United States: 698 to 806 MHz, the European Union region: 470 to 862 MHz), the influence of the AV line cannot be ignored because the wavelength of the radio wave is short, There was a problem that tuning was difficult.

  In order to solve the above problem, conventionally, a ground pattern is provided on the window glass, the antenna conductor is connected to the core that is the inner conductor of the coaxial cable, and the mesh line that is the outer conductor of the coaxial cable and the ground pattern are connected. It is known to reduce signal attenuation between an antenna conductor and an amplifier by connecting them (for example, Patent Documents 1 and 2).

JP-A-6-209205 JP 2001-136010 A

  However, none of the conventional glass antennas can provide a sufficient antenna gain for receiving terrestrial digital television broadcasts.

  In view of the above-described problems, the present invention provides a glass antenna for a vehicle that can provide a sufficient antenna gain for receiving terrestrial digital television broadcasts.

An antenna conductor, a power feeding part connected to the antenna conductor, a ground conductor formed at a predetermined distance from the power feeding part, the power feeding part, and the ground conductor A glass antenna for a vehicle having an independent conductor that is not DC connected to the antenna conductor, the antenna conductor has a horizontal element extending in a substantially horizontal direction, and the ground conductor is a substantially rectangular element having a horizontal length in the horizontal direction. The independent conductor is formed so as to surround the antenna conductor with the ground conductor, and the tip of the horizontal element extending in a substantially horizontal direction is opposed to the tip. The vehicular glass antenna, wherein a distance between a closest part to the independent conductor is 2 mm or more and 110 mm or less.

  Moreover, the window glass for vehicles of this invention is equipped with the glass antenna for vehicles described above, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, the glass antenna for vehicles which can obtain sufficient antenna gain regarding reception of terrestrial digital television broadcasting can be provided.

It is a top view of the glass antenna 100 for vehicles which shows 1st Embodiment. It is a top view of the glass antenna 200 for vehicles which shows 2nd Embodiment. It is a top view of the glass antenna 300 for vehicles which shows 3rd Embodiment. It is a top view of the glass antenna 400 for vehicles which shows 4th Embodiment. This is measured data of antenna gain when the distance between the independent conductor and the horizontal element is changed.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that in the drawings for describing the embodiments, the directions on the drawings are used unless otherwise specified. Further, the directions such as parallel and right angles allow a deviation that does not impair the effects of the present invention. Moreover, each top view is a figure when the surface of glass is seen facing. When the glass plate according to the present invention is applied to a window glass for a vehicle, it is a view of the interior of the vehicle with the window glass attached to the vehicle, but may be referred to as a view of the exterior of the vehicle. For example, when the window glass is a side window attached to the side portion of the vehicle, the left-right direction on the drawing corresponds to the front-rear direction of the vehicle. The present invention is not limited to the side window of the vehicle, but may be applied to a rear glass attached to the rear portion of the vehicle and a windshield attached to the front portion of the vehicle.

  FIG. 1 is a plan view of a glass antenna 100 for a vehicle showing a first embodiment of the present invention. FIG. 2 is a plan view of a glass antenna 200 for a vehicle showing a second embodiment of the present invention, and FIG. 3 is a plan view of a glass antenna 300 for a vehicle showing a third embodiment of the present invention. FIG. 4 is a plan view of a glass antenna 400 for a vehicle showing a fourth embodiment according to the present invention. Glass antennas 100, 200, 300, and 400 are antennas provided on a window glass G that is a side window of a vehicle. 1 to 4 are views of the interior of the vehicle, but the same applies to the exterior of the vehicle. Further, the vertical direction on each drawing corresponds to the vertical direction of the vehicle, and the lower side of each drawing corresponds to the road surface side.

  The glass antenna 100, 200, 300, 400 for vehicle in the present embodiment includes an antenna conductor 1, a feeding part 2 connected to the antenna conductor 1, and a ground conductor 3 formed at a predetermined distance from the feeding part 2. And an independent conductor 4 surrounding the antenna conductor, which is not DC-connected to the power feeding unit 2 and the ground conductor 3, and is formed on the window glass G for a vehicle. The ground conductor 3 is a ground pattern which is a negative electrode when the power feeding unit 2 is a positive electrode. The glass antennas 100, 200, 300, and 400 have at least a horizontal element 11 as a pattern of the antenna conductor 1.

A first embodiment of FIG. 1 will be described.
The window glass G has a quadrangular shape, and the window glass G is fixed to the flange 5 of the window opening of the vehicle body via an adhesive. Since the flange 5 is formed extending from the vehicle body, it is made of metal, and is formed around the opening as a base for attaching the window glass to the window opening. In FIG. 1, the edge of the window glass is omitted, and the flange end 51 is shown. Each element of the glass antenna 100 is formed on the surface of the window glass G by a conductive member.

  The horizontal element 11 is a linear conductor extending in the horizontal direction starting from the power feeding unit 2 and in the left direction in FIG. The horizontal element 11 extends from the power feeding unit 2 to the tip a. The power feeding unit 2 has a square or rectangular shape. The horizontal element 11 may be provided with an auxiliary conductor in the power feeding unit 2 and extended from the auxiliary conductor as a starting point.

  In FIG. 1, the power supply unit 2 is close to the center of the ground conductor 3. The ground conductor 3 has a rectangular shape, is close to the power feeding unit 2, and in the first embodiment, the longitudinal direction of the ground conductor 3 is formed substantially orthogonal to the horizontal direction. The earth conductor 3 only needs to have an inclination of 20 ° or more with respect to the horizontal direction. By tilting by 20 ° or more with respect to the horizontal direction, a sufficient distance from the horizontal element 11 can be maintained, and the antenna gain is improved. Preferably it is 30 ° or more, more preferably 45 ° or more. Further, the shape of the ground conductor 3 is not limited to a rectangle. A wide conductor such as a rectangle suitably functions as a ground. Other shapes may be formed by being bent into an elliptical shape, an L shape, or a U shape, and may have a notch or the like.

The ground conductor 3 requires a predetermined conductor area in order to function as a ground. In the present invention, the length of the ground conductor 3 in the longitudinal direction is 120 mm or more and 300 mm or less, and the length in the width direction is 3 mm or more and 30 mm or less. It is preferable that the length in the longitudinal direction is 120 mm or more because the reception sensitivity is improved as compared with a square having the same area. Alternatively, a sufficient conductor area can be secured when the length in the width direction is 3 mm or more. If the length in the longitudinal direction is 300 mm or less, it can be applied to the window glass without impairing the aesthetic appearance. If the length in the width direction is 30 mm or less, it is difficult to cause distortion when the window glass is heated and bent. . The shape of the ground conductor 3 is not limited, and functions suitably if the conductor area is 360 mm ² or more.

  The independent conductor 4 is a linear conductor that is not DC-connected to the antenna conductor 1 and the ground conductor 3. The independent conductor 4 extends to the left in the horizontal direction starting from a position close to the lower end of the ground conductor 3 and extends upward from the element 41 via the vicinity of the tip a of the horizontal element 11. And an element 43 extending to the right side in the horizontal direction starting from the element 42 to a position close to the upper end of the ground conductor 3. The independent conductor 4 has a U-shape with the elements 41, 42, and 43, and is disposed so as to surround the antenna conductor 1 with the ground conductor 3 and the independent conductor 4.

  The distance between the closest part of the horizontal element 11 and the independent conductor 4, that is, the distance between the closest part of the tip a and the element 42 is 2 mm or more and 110 mm or less, preferably 2 mm or more and 70 mm or less, more preferably 2 mm. It is 30 mm or less. When the distance between the closest portions of the horizontal element 11 and the independent conductor 4 is 110 mm or less, the antenna gain is improved. Further, if the horizontal element 11 and the independent conductor 4 are too close to each other, it is difficult to form a conductor by separating them from each other. Therefore, the thickness is preferably 2 mm or more from the viewpoint of productivity.

  Next, a second embodiment of FIG. 2 will be described. The description of the same configuration as that of the first embodiment is omitted.

  The shape of the window glass G is a triangle, and each element of the glass antenna 200 is formed on the surface of the window glass G by a conductive member. In FIG. 2, the window opening of the vehicle body is omitted, and only the window glass is shown.

  In the second embodiment, the horizontal element 11 is provided with a second horizontal element 12 extending to the right in the horizontal direction starting from the power feeding unit 2 and extending in parallel near the horizontal element 11. The second horizontal element 12 runs in parallel from the power feeding unit 2 to the vicinity of the tip a of the horizontal element 11. In FIG. 2, the conductor length of the second horizontal element 12 is the same as that of the horizontal element 11, but may be shorter. By providing the second horizontal element 12, the antenna gain is improved.

  The ground conductor 3 is formed such that the longitudinal direction of the ground conductor 3 is inclined by about 70 ° with respect to the horizontal direction. A connection conductor 13 is provided above the power supply unit 2 as a starting point. A loop conductor 14 formed in a loop shape is connected to the tip of the connection conductor 13. The connecting conductor 13 extends along the extending direction of the ground conductor 3, and the loop conductor 14 is formed in a quadrangular shape along the ground conductor 3 from the tip of the connecting conductor 13. The loop conductor 14 is not limited to a quadrangle, and may be a triangle, a polygon, a circle, or an ellipse. In the case of a polygon, the corner may have an arc shape. By providing the loop conductor 14, the antenna gain is improved.

  The independent conductor 4 has an element 41 extending to the right in the horizontal direction starting from a position close to the lower end of the ground conductor 3, and the tip a of the horizontal element 11 and the tip of the second horizontal element 12 starting from the element 41. an element 42 extending upward so as to pass through the vicinity of b, and an element 43 extending to the position close to the upper end of the ground conductor 3 along the outline of the window glass in the left direction starting from the element 42; The auxiliary element 44 is disposed along the ground conductor 3 starting from the element 43. The aesthetic appearance of the element 43 is improved by extending along the outline of the window glass. Also, by providing the auxiliary element 44, the ground conductor 3 and the independent conductor 4 are capacitively coupled, and the antenna gain is improved.

  Next, a third embodiment of FIG. 3 will be described. The description of the same configuration as that of the first embodiment is omitted.

  The window glass G has a quadrangular shape, and the window glass G is fixed to the flange 5 of the window opening of the vehicle body via an adhesive. In FIG. 3, the edge of the window glass is omitted, and the flange end 45 is shown. Each element of the glass antenna 300 is formed on the surface of the window glass G by a conductive member.

  In 3rd Embodiment, the independent conductor 4 is the flange end 45 of the window opening part of the vehicle body to which the window glass G is attached. The flange end 45 is disposed so as to surround the entire antenna conductor 1 and the ground conductor 3. The distance between the closest ends of the flange end 45 and the tip a of the horizontal element 11 is 2 mm or more and 110 mm or less. Preferably, they are 2 mm or more and 70 mm or less, More preferably, they are 2 mm or more and 30 mm or less. This configuration also improves the antenna gain.

  Next, a fourth embodiment of FIG. 4 will be described. The description of the same configuration as that of the second embodiment is omitted.

  The shape of the window glass G is a triangle, and each element of the glass antenna 400 is formed on the surface of the window glass G by a conductive member. In FIG. 4, the flange end 45 when the window glass G is fixed to the flange of the window opening of the vehicle body via an adhesive is indicated by a dotted line.

  The earth conductor 3 is formed such that the upper longitudinal direction of the earth conductor 3 is inclined by about 70 ° with respect to the horizontal direction, and the lower longitudinal direction is inclined by about 90 ° with respect to the horizontal direction, and the earth conductor 3 is bent. It has a shape. Further, a terminal attachment portion connected to the ground conductor is provided so as to protrude from the ground conductor 3 in a direction inclined by about 70 ° with respect to the horizontal direction from the power feeding portion 2. By adopting such a shape, the terminal can be easily connected even if the ground conductor 3 is bent.

  A connection conductor 13 is provided below the power feeding unit 2 as a starting point. A loop conductor 14 formed in a loop shape is connected to the tip of the connection conductor 13. The connecting conductor 13 extends along the extending direction of the ground conductor 3, and the loop conductor 14 is formed in a quadrangular shape along the ground conductor 3 from the tip of the connecting conductor 13. The loop conductor 14 is not limited to a quadrangle, and may be a triangle, a polygon, a circle, or an ellipse. In the case of a polygon, the corner may have an arc shape. By providing the loop conductor 14, the antenna gain is improved.

  In addition, an L-shaped auxiliary conductor 15 is provided below the power feeding unit 2 as a starting point. The auxiliary conductor 15 extends along the extending direction of the ground conductor 3, bends rightward, and extends below the loop conductor 14. By providing the auxiliary conductor 15, the antenna gain is improved.

  In addition, a ground-side loop conductor 31 formed in a loop shape is connected to the ground conductor 3. The ground side loop conductor 31 is formed in a square shape along the ground conductor 3. The ground-side loop conductor 31 is not limited to a quadrangle, and may be a triangle, a polygon, a circle, or an ellipse. In the case of a polygon, the corner may have an arc shape. Further, it may be provided via a connection element connected to the ground conductor 3. By providing the ground side loop conductor 31, the antenna gain is improved.

  The independent conductor 4 passes through the vicinity of the tip a of the horizontal element 11 and the tip b of the second horizontal element 12 starting from the element 41 and the element 41 extending rightward in the horizontal direction starting from the vicinity of the tip of the auxiliary conductor 15. The element 42 extending upward, the element 43 starting from the element 42, and the element 43 extending leftward along the outline of the window glass to a position close to the upper end of the ground conductor 3, and the element 43 as the starting point The auxiliary element 44 extends close to the left side of the ground conductor 3 and a flange end 45. Although the element 41 does not extend to a position close to the ground conductor 3, the flange end 45 is positioned below the element 41, and the independent conductor 4 is formed in combination with the flange end 45. As described above, the independent conductor 4 may be configured by a combination of the linear conductor and the flange end of the opening of the vehicle body.

  In addition, the flange end 45 and a part of the antenna conductor 1 and a part of the ground conductor 3 overlap each other in plan view. However, since the window glass G is fixed to the flange via an adhesive, the flange and the antenna conductor. 1 and the ground conductor 3 are not connected in direct current. In this way, the antenna conductor or the like may overlap the flange at a location separated from the horizontal element 11. With such a configuration, the antenna conductor 1, the power feeding unit 2, the ground conductor 3, and the independent conductor 4 can be arranged in a state in which reception performance is ensured even with a window glass having a small area.

  As described above, in the case of the glass antennas 100, 200, 300, and 400 having the forms illustrated in FIGS. 1, 2, 3, and 4, the signal path of the power feeding unit 2 to the external signal processing device (for example, an in-vehicle amplifier) is used. Are electrically connected to each other via a predetermined first conductive member, and the ground conductor 3 is electrically connected to an external ground path (for example, the ground of the signal processing device) via a predetermined second conductive member. Thus, it is possible to obtain reception characteristics compatible with reception of terrestrial digital television broadcasting. That is, the glass antenna of the present invention can receive high-frequency horizontally polarized radio waves with higher sensitivity. The attachment angle of the window glass G to the vehicle is preferably 30 to 90 °, particularly 60 to 90 ° with respect to the ground plane.

  As said 1st and 2nd electroconductive member, feeder lines, such as AV line and a coaxial cable, are used, for example. When a coaxial cable is used, the inner conductor of the coaxial cable may be electrically connected to the power feeding unit 2 and the outer conductor of the coaxial cable may be electrically connected to the ground conductor 3. In addition, a connector for electrically connecting a conductive member such as a conductive wire connected to the signal processing device to each of the power supply unit 2 and the ground conductor 3 is mounted on each of the power supply unit 2 and the ground conductor 3. May be adopted. With such a connector, it is easy to attach the inner conductor of the coaxial cable to the power feeding unit 2 and to attach the outer conductor of the coaxial cable to the ground conductor 3. Furthermore, it is also possible to provide a configuration in which a protruding conductive member is installed on each of the power feeding unit 2 and the ground conductor 3 so that the protruding conductive member contacts and fits to a flange of the vehicle body to which the window glass G is attached. Good.

  In addition, the elements 41, 42, 43, and 44 of the antenna conductor 1, the feeding portion 2, the ground conductor 3, and the independent conductor 4 are made of a paste containing a conductive metal, such as silver paste, on the inner surface of the window glass, for example. Formed by printing and baking. However, the present invention is not limited to this forming method, and a linear or foil-like body made of a conductive material such as copper may be formed on the vehicle inner surface or vehicle outer surface of the window glass. It may be attached by, for example, or may be provided inside the window glass itself.

  The shape of the power supply unit 2 and the ground conductor 3 and the distance between the power supply unit 2 and the ground conductor 3 may be determined according to the shape of the mounting surface of the conductive member or connector and the interval between the mounting surfaces.

  Moreover, it is good also as a glass antenna by providing the conductor layer which consists of each antenna conductor in the inside or the surface of a synthetic resin film, and providing the synthetic resin film with a conductor layer in the vehicle inner surface or vehicle outer surface of a window glass. Furthermore, it is good also as a glass antenna by providing the flexible circuit board in which each antenna conductor was formed in the vehicle inner surface or vehicle outer surface of a window glass.

  Further, a concealing film may be formed on the surface of the window glass G, and a feeding part, a ground conductor, an antenna conductor, and a part or the whole of the independent conductor may be provided on the concealing film. The concealing film may be a ceramic such as a black ceramic film. In this case, when viewed from the outside of the window glass, the portion of the antenna conductor provided on the masking film by the masking film becomes invisible from the outside of the vehicle, and the window glass has an excellent design. In the configuration shown in the drawing, a part of the feeding portion, the ground conductor, the antenna conductor, and the independent conductor is formed on the concealment film, so that only the thin straight portion of the conductor is seen in the vehicle exterior view, which is preferable in terms of design.

By the way, in the present invention, the wavelength in the air at the center frequency of the frequency band of the broadcast to be received is λ ₀ , the glass wavelength shortening rate is k (where k = 0.64), and λ _g = λ ₀ · k. , conductor length of the horizontal elements 11, 0.16Ramuda _g or more 0.52Ramuda _g or less, more preferably preferred in terms of improved antenna gain results equal to or less than 0.25 [lambda _g or 0.42λ _g.

Here, when the domestic terrestrial digital television broadcast (470-770 MHz) is set as the frequency band of the broadcast to be received, the center frequency is 620 MHz. Accordingly, when it is desired to improve the antenna gain of digital terrestrial television broadcasting in Japan, the conductor length of the horizontal element 11 is more preferably 50 mm or more and 160 mm or less when the speed of the radio wave is 3.0 × 10 ⁸ m / s. Is preferably adjusted to 80 mm or more and 130 mm or less.

In the embodiment of the glass antenna 200 of FIG. 2, if the conductor length of the loop conductor is 0.74λ _g or more and 1.07λ _g or less, more preferably 0.8λ _g or more and 0.97λ _g or less, reception is possible. A favorable result is obtained in terms of improving the antenna gain in the broadcast frequency band. Therefore, when it is desired to improve the antenna gain of digital terrestrial television broadcasting in Japan, the conductor length of the loop conductor is adjusted to 230 mm or more and 330 mm or less, more preferably 250 mm or more and 300 mm or less.

  In the present embodiment, the case where the glass antenna for a vehicle is formed on the side window on one side of the vehicle body has been described. However, the glass antenna for a vehicle according to the present invention is provided on the side window on both sides of the vehicle body. May be. In this case, diversity reception is preferable because directivity is improved and reception characteristics are improved.

[Example 1]
The actual measurement result of the antenna gain of the glass antenna 100 shown in FIG. 1 will be described.
A window glass G including the glass antenna 100 shown in FIG. 1 is attached to a metal frame 5 simulating a flange of an automobile body opening, and the metal frame is set so that the window glass G is in a state of about 90 ° with respect to a horizontal plane. 5 was fixed on the turntable. A connector is attached to the power supply unit 2 and is connected to a network analyzer via a feeder line. The turntable rotates so that radio waves are applied to the window glass G from all directions from the horizontal direction.

  The antenna gain was measured by setting the center of the metal frame with the window glass G attached to the center of the turntable and rotating the metal frame by 360 °. The antenna gain data was measured every 6 MHz in the range of 473 MHz to 713 MHz of terrestrial digital television broadcasting at every rotation angle of 3 °. The elevation angle between the transmission position of the radio wave and the antenna conductor was measured in a substantially horizontal direction (when the plane parallel to the ground is elevation angle = 0 ° and the zenith direction is elevation angle = 90 °, the elevation angle = 0 ° direction). The antenna gain was standardized so that the half-wave dipole antenna was 0 dB with reference to the half-wave dipole antenna.

The dimensions of the glass antenna and the metal frame at that time are as follows.
Conductor length of horizontal element 11: 100 mm
Power feeding unit 2: 5 x 5 mm
Earth conductor 3: 240 × 10 mm
Conductor length of element 41: 120 mm
Conductor length of element 42: 260 mm
Conductor length of element 43: 120 mm
Metal frame 5: 400 × 400mm
Flange end 51: 280 × 280mm
Distance D1: 10 mm of the closest part between the horizontal element 11 and the independent conductor
D2, D3, D4, D5: 10mm
D6: 5mm
The conductor width of the antenna conductor 1 and the independent conductor 4 is 0.8 mm.

  Further, in the glass antenna 100 shown in FIG. 1, a glass antenna without the U-shaped independent conductor 4 was prepared and attached to a metal frame in the same manner as described above, and the same antenna gain was measured. The conditions are the same as above except for the independent conductor 4.

  As a result, the average antenna gain when the independent conductor 4 is present is −2.8 dBd, and the average antenna gain when the independent conductor 4 is not present is −3.3 dBd. From this, it can be seen that the presence of the independent conductor 4 improves the antenna gain.

[Example 2]
Next, an actual measurement result of the antenna gain of the glass antenna 200 shown in FIG. 2 will be described.
A window glass G provided with the glass antenna 200 shown in FIG. Set the center of the turntable so that the center of the vehicle with the window glass G attached is aligned with the center of the turntable, and rotate the turntable so that the window glass G is irradiated from all directions. Measured every 6 MHz in the range of 473 MHz to 713 MHz of terrestrial digital television broadcasting. Other conditions are the same as in Example 1.

The dimensions of each part of the glass antenna are as follows.
Conductor length of the horizontal element 11: 110 mm
Earth conductor 3: 215 × 10 mm
Conductor length of element 41: 80 mm
Conductor length of element 42: 135 mm
Conductor length of element 43: 160 mm
Conductor length of auxiliary element 44: 30 mm
Conductor length of connecting conductor 13: 10 mm
Circumference length of loop conductor 14: 270 mm
Distance D1: 5 mm between the closest portions of the horizontal element 11 and the independent conductor
D7: 5mm
Other dimensions are the same as in Example 1.

  Further, in the glass antenna 200 shown in FIG. 2, a glass antenna without the independent conductor 4 and the loop conductor 14 (without the connection conductor 13) was prepared, and the antenna gain was measured in the same manner as described above. Further, a glass antenna without only the loop conductor 14 was prepared, and the same antenna gain was measured. The conditions other than this are the same as above. Table 1 shows the average antenna gain for these results.

  As shown in Table 1, the antenna gain is compared by comparing the case without the independent conductor and loop conductor with the case without the loop conductor, that is, by adding the independent conductor to the glass antenna without the independent conductor and loop conductor. Can be seen to improve. Further, it can be seen that the antenna gain is improved by adding the loop conductor 14.

[Example 3]
Next, the actual measurement result of the antenna gain of the glass antenna 300 shown in FIG. 3 will be described.
In FIG. 3, the antenna gain was measured by moving the flange end 45 backward from the antenna conductor 1 side to change the distance D1 between the tip a of the horizontal element 11 and the flange end 45. The independent conductor in FIG. 3 is the flange end 45, and the elements 41, 42, and 43 in FIG. 1 are not provided. The other conditions are the same as in Example 1.

The dimensions of each part of the glass antenna are as follows.
D8, D9: 20mm
Other dimensions are the same as in Example 1.

  The distance between the independent conductor and the horizontal element 11 was measured every 20 mm in the range of 10 to 150 mm. The result is shown in FIG. From this figure, it can be seen that the antenna gain is improved when the distance between the independent conductor and the horizontal element is 110 mm or less. Moreover, antenna gain improves by setting it as 70 mm or less and also 30 mm or less.

  As mentioned above, although the form which concerns on implementation of this invention was demonstrated, the said content does not limit the content of invention.

  INDUSTRIAL APPLICABILITY The present invention is used for, for example, a glass antenna for an automobile that receives terrestrial digital TV broadcast, UHF analog TV broadcast, US digital TV broadcast, European Union digital TV broadcast, or People's Republic of China digital TV broadcast. It is preferable. Also used for FM broadcast band in Japan (76-90MHz), FM broadcast band in the US (88-108MHz), TV VHF band (90-108MHz, 170-222MHz), keyless entry system for vehicles (300-450MHz) it can.

  Also, 800 MHz band (810 to 960 MHz) for automobile telephones, 1.5 GHz band (1.429 to 1.501 GHz) for automobile telephones, GPS (Global Positioning System), GPS signals of artificial satellites 1575.42 MHz), VICS (Registered trademark) (Vehicle Information and Communication System: 2.5 GHz).

  Furthermore, ETC communication (Electronic Toll Collection System: non-stop automatic toll collection system, roadside wireless device transmission frequency: 5.795 GHz or 5.805 GHz, roadside wireless device reception frequency: 5.835 GHz or 5.845 GHz), dedicated narrow Area communication (DSRC: Dedicated Short Range Communication, 915 MHz band, 5.8 GHz band, 60 GHz band), microwave (1 GHz to 3 THz), millimeter wave (30 to 300 GHz), and SDARS (Satellite Digital Audio Radio Service (2. 34 GHz, 2.6 GHz)).

DESCRIPTION OF SYMBOLS 1 Antenna conductor 11 Horizontal element 12 2nd horizontal element 13 Connection conductor 14 Loop conductor 2 Feeding part 3 Grounding conductor 4 Independent conductors 45 and 51 Flange end 5 Flange G Window glass

Claims (15)

An antenna conductor, a power feeding part connected to the antenna conductor, a ground conductor formed at a predetermined distance from the power feeding part, the power feeding part, and the ground conductor In a glass antenna for a vehicle provided with an independent conductor that is not connected to DC
The antenna conductor has a horizontal element extending in a substantially horizontal direction,
The ground conductor is a substantially rectangular element, and the longitudinal direction is inclined by 20 ° or more with respect to the horizontal direction,
The independent conductor is formed so as to surround the antenna conductor with the ground conductor,
The glass antenna for a vehicle according to claim 1, wherein an interval between a tip of the horizontal element extending in a substantially horizontal direction and a closest portion between the independent conductor facing the tip is 2 mm or more and 110 mm or less.   2. The vehicle according to claim 1, wherein the independent conductor extends from a position close to one end of the ground conductor and extends to a position close to the other end of the ground conductor via the vicinity of the tip of the horizontal element. Glass antenna.   The glass antenna for a vehicle according to claim 1, wherein the independent conductor has a U shape or a U shape.   The glass antenna for a vehicle according to claim 1, wherein the independent conductor is a flange end of the vehicle body opening to which the window glass is attached.   The glass antenna according to claim 1, wherein the independent conductor is configured by a combination of a linear conductor and a flange end of the vehicle body to which the window glass is attached.   The glass antenna for a vehicle according to any one of claims 1 to 5, wherein the antenna conductor includes a second horizontal element that extends close to and parallel to the horizontal element.   The said antenna conductor is a glass antenna for vehicles in any one of Claim 1 to 6 provided with the loop conductor formed in the loop shape via the connection conductor connected to an electric power feeding part. The wavelength in the air at the center frequency of the frequency band to be received is λ0, the glass wavelength shortening rate is k (where k = 0.64), λg = λ0 · k,
The glass antenna for a vehicle according to claim 7, wherein a conductor length of the loop conductor is 0.74 λg or more and 1.07 λg or less.   The glass antenna for vehicles according to claim 7 whose conductor length of said loop conductor is 230 mm or more and 330 mm or less. The wavelength in the air at the center frequency of the frequency band of the broadcast to be received is λ0, the glass wavelength reduction rate is k (where k = 0.64), λg = λ0 · k,
The glass antenna for a vehicle according to any one of claims 1 to 9, wherein a conductor length of the horizontal element is 0.16λg or more and 0.52λg or less.   The glass antenna for vehicles according to any one of claims 1 to 9 whose conductor length of said horizontal element is 50 mm or more and 160 mm or less.   12. The glass antenna for a vehicle according to claim 1, wherein the ground conductor has a length in the longitudinal direction of 120 mm to 300 mm and a length in the width direction of 3 mm to 30 mm.   The glass antenna for a vehicle according to any one of claims 1 to 12, wherein a frequency band to be received is in a range of 470 to 862 MHz.   A vehicle window glass comprising the vehicle glass antenna according to claim 1. The glass antenna for a vehicle according to any one of claims 1 to 14, wherein an interval between the closest portions is 2 mm or more and 70 mm or less.

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