JP2005130414A - On-glass antenna for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange, in particular, an AM/FM broadcasting wave antenna and a TV broadcasting wave antenna, together on the same side window glass for vehicle. <P>SOLUTION: A first antenna for receiving AM/FM radio/broadcast waves that extends horizontally from a first power feeding point provided near an approximately intermediate portion of a longitudinal side on one side of the vehicle side window glass to the other longitudinal side and includes at least a first horizontal wire is disposed in an approximately central area of the side window glass sufficiently spaced from upper and lower sides of a metal flange, and a second antenna for receiving TV broadcast waves that comprises second and third power feeding points are provided to the upper side and the lower side positions near the longitudinal side and includes, at least a second horizontal wire, horizontally extending from the second power feeding point, is provided in an upper side area. A third antenna for receiving TV broadcast waves, that includes at least a third horizontal wire extending horizontally from the third power feeding point, is provided ion the lower-side area of the first antenna. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a glass antenna provided on a side window glass for a vehicle such as an automobile, and more particularly, a glass antenna suitable for receiving radio waves of AM / FM radio broadcast waves, and suitable for receiving radio waves of TV broadcast waves. The present invention relates to a glass antenna that can be attached to the same side window glass.

  Conventionally, as a glass antenna for a vehicle, an antenna provided in an upper margin or a lower margin of a conductive wire for heating a defogger of a rear window glass, and an antenna provided with a filament antenna on a front window glass are known. However, in the case where an antenna is provided on the former rear window glass, the space in the blank portion is provided by providing heating lines for anti-fogging in almost the entire area of the rear window glass. However, in order to secure a field of view such as rainy weather, it is necessary to take a large anti-fogging area, so the area where the antenna can be disposed is inevitably reduced, and the antenna is disposed in the margin. In some cases, a sufficient reception gain cannot always be obtained.

  In addition, when the antenna is provided on the latter front window glass, a relatively high reception gain can be obtained, but there are restrictions on the installation location beyond the rear window glass so as not to disturb the driver's view.

  Furthermore, when a glass antenna is provided in an RV (Recreational vehicle) vehicle, a wagon-type vehicle, or the like, many rear windows can be opened and closed, and a coaxial cable or the like wired from the antenna provided on the rear window glass can be opened and closed. Repeated refraction tends to cause failures such as disconnection and poor contact.

  In addition, even if it is a type that does not open and close, the area where the antenna can be arranged on the rear window glass is small, and the mounting angle is close to a right angle. Even if an antenna wire is provided at this location, the reception area is small and sufficient reception gain cannot be obtained, and the antenna wire that receives AM radio broadcast waves and FM radio broadcast waves with low reception frequencies has a significant effect. Appears.

  Therefore, with the widespread use of RV cars that have few such restrictions and a relatively large area side window glass, the antenna for receiving radio broadcasts provided on the side window glass has attracted attention and demand. It is becoming.

  Furthermore, with the spread of in-vehicle televisions in recent years, TV broadcast wave receiving antennas have to be provided by finding a slight margin on the rear window glass of the vehicle and the side window glass. In this case, since reception gain and directivity characteristics higher than those of AM / FM and the like are pursued, reception by diversity has become common.

  For this reason, a wide variety of antennas such as an antenna for receiving TV broadcast waves and an antenna for receiving AM / FM radio are provided on the window glass for the vehicle, and the space for the antenna is in an overcrowded state.

  As the glass antenna provided on the side window glass, for example, the one disclosed in Japanese Patent Application Laid-Open No. 2003-133830 by the present applicant is suitable for reception of radio waves for AM / FM radio broadcasting provided on the side window for vehicles. In the glass antenna, a feeding point is provided in the vicinity of the vertical side of the window glass, and the middle of the filament along the opening side of the flange is connected to the feeding point directly or via a lead wire from the vicinity of the middle part of the vertical side. Furthermore, a first element having at least a horizontal line that is capacitively coupled to the substantially horizontal opening side of the flange, and a substantially U-shaped second element comprising a horizontal line and at least one folded line from its tip. A third element comprising a plurality of horizontal filaments is formed by extending the distal end of the horizontal filament of the first element from the distal end of the vertical filament portion of the first element or from the middle to the opposite longitudinal sides. The horizontal line of the first element is branched from the vertical line part of the first element, and is provided so as not to intersect with other lines toward the opposite vertical side, and the antenna is placed in the upper half or lower half of the glass surface. A glass antenna for a vehicle for AM / FM reception, characterized in that it is disposed, and in the specific embodiment shown in FIG. An example has been disclosed in which an antenna for FM radio reception is provided and two TV antennas are provided in the lower half region (Patent Document 1).

Similarly, in Japanese Patent Application Laid-Open No. 2003-163523 by the present applicant, in a glass antenna suitable for receiving radio waves for AM / FM radio broadcasting provided on a side window for a vehicle, a feeding point is provided near the vertical side of the window glass. And connecting the middle of the strip along the opening side of the flange from the vicinity of the middle part of the vertical side to the feeding point directly or via a lead wire, and further capacitively coupling with the substantially horizontal opening side of the flange A first element provided with at least a horizontal line, and a horizontal line end of a horizontal element and at least one folded line from the tip of the horizontal element, and the end of the horizontal line of the first element. Branch from the front or the middle of the vertical line part to the opposite vertical side and branch the horizontal line of the third element consisting of multiple horizontal lines from the vertical line part of the first element And a glass antenna for a vehicle characterized in that the antenna is disposed in the upper half or lower half of the glass surface so as not to intersect with other filaments toward the opposite vertical sides. Specifically, an AM / FM antenna line is provided on a part of the upper or lower surface of the side window glass for the vehicle, not on the entire surface, so that a space for installing an antenna such as a television is secured. A glass antenna is disclosed (Patent Document 2).
JP 2003-133830 A JP 2003-163523 A

  As described above, the side window glass is provided with an antenna for receiving AM / FM radio, a plurality of television broadcast wave antennas are provided in the margin, one is provided on the rear window glass, and the other is provided. Generally, it is a common practice to provide the antenna with the side window glass or to receive diversity by using the antennas provided on the left and right side window glasses.

  Conventionally, when a glass antenna for AM / FM is disposed on the side window glass, there are many cases where the glass antenna is disposed over almost the entire surface of the side window glass, and a space for providing an antenna for TV broadcasting cannot be secured. There were many such problems. For this reason, if an attempt is made to provide a TV broadcast receiving antenna in a small margin of the AM / FM broadcast wave receiving antenna on the side window glass, the TV antennas interfere with each other. It was difficult to improve the gain.

  In order to solve these problems, as described in Japanese Patent Application Laid-Open No. 2003-133830 and Japanese Patent Application Laid-Open No. 2003-163523, each glass antenna is a region of an upper half or a lower half of a side window glass of a vehicle. Is provided with a glass antenna for AM / FM radio broadcast waves, and is further devised so that an antenna space for TV can be secured in the remaining margin.

  However, these antennas have a sufficiently satisfactory reception gain for receiving AM / FM radio broadcast waves, and it is possible to secure a space for providing an antenna for receiving TV broadcast waves. A plurality of antennas for TV broadcast waves must be provided close to the same area of the upper half or the lower half of the glass.

  Therefore, in this case, the TV antennas interfere with each other and affect each other, so that the diversity effect is poor, and a different reception frequency band is allocated to each TV antenna. For example, VHF-HIGH band and VHF-LOW There is a problem that it is necessary to devise such as assigning reception frequency bands having different bands, and it is impossible to provide antennas in the same frequency band in the vicinity of the same side window glass.

  The present invention has been made in view of such a point, and an antenna for receiving an AM / FM broadcast wave is provided on a side window glass for a vehicle, and a TV broadcast wave band of the same frequency band is provided in a blank portion thereof. It is an object of the present invention to make it possible to arrange antennas without interfering with each other.

  That is, according to the present invention, the first feeding point is provided in the vicinity of the substantially middle portion of the vertical side on one side of the vehicle side window glass, and the horizontal direction is directed from the first feeding point toward the vertical side on the other side. A first antenna for receiving an AM / FM radio broadcast wave having at least a first horizontal line extending in the vicinity of the horizontal center line of the window glass, and an upper side and a lower side in the vicinity of the vertical side A second feeding point and a third feeding point are provided at the side positions, and a second antenna for receiving TV broadcast waves having at least a second horizontal line extending in a horizontal direction from the second feeding point is provided on the upper side. A third antenna for receiving TV broadcast waves having at least a third horizontal line extending in a horizontal direction from the third feeding point is provided in a lower side area of the first antenna. It is a glass antenna for a vehicle characterized by

Alternatively, according to the present invention, the first antenna for receiving AM / FM radio broadcast waves extends in the horizontal direction from the first feeding point toward the vertical side on the other side. A first line having at least a first line, a vertical line branched in a vertical direction from the first horizontal line at or near the first feeding point, and a horizontal line extending in parallel to the first horizontal line from its tip It is a glass antenna for a vehicle as described above, characterized by comprising a second element comprising a strip.

  Alternatively, according to the present invention, when the length of the first element of the first antenna is λ, which is a wavelength of an intermediate frequency of a domestic FM broadcast wave band of 76 to 90 MHz, α (2N−1) λ / 4 (N = integer of 1 or more, α = wavelength shortening rate by glass) The above-described glass antenna for a vehicle.

  Alternatively, in the present invention, the length of each line of the second antenna and the third antenna may be 90 to 108 MHz band TV broadcast wave VHF-LOW, and 170 to 222 MHz band TV broadcast wave VHF-HIGH band. The vehicle according to any one of the above, wherein α (2N−1) λ / 4 (N = 1 or greater, α = wavelength shortening rate by glass), where λ is the wavelength of the intermediate frequency Glass antenna for use.

  According to the glass antenna of the present invention, the first antenna 10 for receiving AM / FM radio broadcast waves is separated from the upper side and the lower side of the metal flange of the side window, and the middle position of the side window glass in the vertical direction. In addition to improving the reception sensitivity of the AM / FM radio even if the area surrounded by the antenna is small, the upper side of the first antenna provided for the AM / FM is provided. Even if the antennas for receiving TV broadcast waves provided in the upper and lower margins secured in the area and the lower area are antennas in the same frequency band as well as in different frequency bands, they do not interfere with each other. It is possible to dispose within the same glass plate surface, and reception characteristics can be improved.

  As shown in FIG. 1, the glass antenna of the present invention is AM / FM from a first feeding point 11 provided in the vicinity of a substantially middle portion of the vertical side on one side of the window glass on the rear seat side of the vehicle side portion. A first antenna 10 for receiving radio broadcast waves is disposed, and the first feeding point 21 and the third feeding point 31 provided at the upper side and lower side positions in the vicinity of the vertical side are referred to as the first feeding point 21. A second antenna 20 for receiving TV broadcast waves and a third antenna 30 are provided in the upper side region and the lower side region of the antenna 10.

  The first antenna 10 is disposed so as to be a substantially central region of the side window glass that is sufficiently separated from the upper side and the lower side of the metal flange of the window frame, and the first feeding point. A first element 12 having at least a horizontal line extending in the horizontal direction toward the vertical side on the other side from 11, and above or below the first horizontal line on or near the first feeding point 11 From at least one of the vertical strips 13c and 13d extending in the vertical direction and extending slightly, and the horizontal strips 13a and 13b extending from the tip thereof to the first horizontal strip and extending to substantially the same length. And at least the second element 13.

  Regarding the length of the filament of the first element 12 of the first antenna 10, when the wavelength of 82 MHz, which is the intermediate frequency of the domestic FM broadcast wave band of 76 to 90 MHz, is λ, α (2N−1) It is preferable that λ / 4 (N is an integer equal to or greater than 1 and α is a wavelength shortening rate by glass) because the signal can be received well over the entire domestic FM broadcast wave band.

  Further, as shown in FIGS. 1, 3, and 5, the first antenna 10 is configured so that the two horizontal wires 13 a and 13 b and the horizontal wire of the first element 12 are the same as the first feeding point 11. You may make it connect the front end side of an other side with a vertical line.

  In addition, as shown in FIG. 2, the two horizontal filaments 13a and 13b and the horizontal filament of the first element 12 are not connected at the tip side opposite to the first feeding point 11, and are opened. There may be.

  Furthermore, as shown in FIGS. 4 and 6, any two of the two horizontal filaments 13 a and 13 b and the horizontal filament of the first element 12 are arranged on the tip side opposite to the first feeding point 11. It may be in an open state in which the connection is made in FIG.

  Furthermore, although not shown, the first element 12 intersects a vertical line connecting the two horizontal lines 13a and 13b on the tip side opposite to the first feeding point 11, and the vertical line The horizontal filament may be extended through the strip toward the vertical side opposite to the first feeding point.

  The second element suitable for receiving the AM radio broadcast wave is parallel to the first element and substantially the same length, and is provided so as to sandwich the first element, but is closed loop so as to surround the first element. It is good also as a shape.

  These second elements may have various shapes, but it is important that the first element for receiving the FM radio broadcast wave band is not affected.

  When receiving an ordinary AM radio broadcast wave, the antenna has a higher reception gain as the area of the region surrounded by the antenna stripe increases. Therefore, in the present invention, the two horizontal stripes 13a of the second element, It is preferable to widen the distance 13b to some extent and increase the area of the region surrounded by the antenna stripes.

  However, as shown in FIG. 1, the second element is provided in a horizontally long shape substantially at the center in the vertical direction of the side window glass, and the metal body is separated from the upper and lower sides of the metal window flange of the side window. Therefore, even if the area surrounded by the second element is relatively small, good reception sensitivity can be obtained.

  As described above, the first antenna 10 is separated from the upper side and the lower side of the metal flange of the side window, and is provided at the center in the vertical direction of the side window glass, thereby improving the reception sensitivity of the AM / FM radio. In addition, two large margins can be secured between the first antenna and the upper and lower sides, and an antenna for receiving TV broadcast waves can be provided in each of the margins.

  In the second element of the first antenna, the receiving gain can be improved by adjusting the impedance by providing a branch line or a folded line if necessary.

  The second antenna 20 has at least a second horizontal filament extending in the horizontal direction from the second feeding point, and is provided in the upper side area of the first antenna.

  For the second antenna 20, not only the second horizontal filament 22 is extended from the second feeding point as shown in FIGS. 1 and 2, but also various deformation patterns are conceivable.

  That is, as shown in FIG. 3, after slightly bending in the vertical direction from the tip of the second horizontal filament 22, horizontal stripes may be provided in the horizontal direction on the left and right sides of the tip.

  Further, as shown in FIG. 4, the horizontal line is extended in the horizontal direction from the second feeding point 21, and the vertical line branched in both the upper and lower directions from the position near the second feeding point 21 is further extended. A horizontal line parallel to the horizontal line and having substantially the same length may be extended in the horizontal direction from the tip of the vertical line.

  Furthermore, as shown in FIG. 5, after providing a line slightly branched in the vertical direction from the middle part of the second horizontal line 22, a horizontal line is provided in the horizontal direction on the left and right sides from the tip of the line. May be.

  Furthermore, as shown in FIG. 6, after providing the vertical line slightly branched in the vertical direction from the middle part of the second horizontal line 22, the horizontal line is provided in the horizontal direction on one side from the tip of the line. You may do it.

  Alternatively, although not shown, after slightly bending in the vertical direction from the tip of the second horizontal filament 22, a horizontal filament is provided in the horizontal direction on the second feeding point side from the tip of the filament. Also good.

  Furthermore, the third antenna 30 has at least a third horizontal filament extending in the horizontal direction from the third feeding point 31, and is provided in the lower side region of the first antenna. .

  For the third antenna 30, not only the third horizontal filament 32 is extended from the third feeding point as shown in FIGS. 1 and 2, but also various deformation patterns similar to those of the second antenna 20 can be considered. .

  Assuming that the length of each line of the second antenna 20 and the third antenna 30 is a wavelength of 98 MHz, which is an intermediate frequency of the TV broadcast wave VHF-LOW band of the 90 to 108 MHz band, α (2N−1 ) Λ / 4 (N = 1 or larger integer, α = wavelength shortening rate by glass) is preferable because it can be satisfactorily received over the entire TV broadcast wave VHF-HIGH / LOW band.

  Further, although the second antenna 20 and the third antenna 30 are provided along the upper side and the lower side of the metal flange 2 to some extent, it is desirable that the second antenna 20 and the third antenna 30 are not so close to the metal flange 2.

  Furthermore, the second antenna 20 and the third antenna 30 may be provided with a folded line obtained by folding the tip of each horizontal line for impedance adjustment, and in the vertical direction along the vertical side. You may make it provide the extended vertical filament.

  Furthermore, the positions of the second feeding point 21 and the third feeding point 31 are provided near the center of the vertical side, and the second feeding point 21 and the third feeding point 31 extend along the vertical side. You may make it extend to an upper side corner or a lower side corner, and may extend a horizontal filament in the horizontal direction from the front-end | tip.

  The position of the first feeding point of the first antenna and the positions of the second antenna, the second feeding point of the third antenna, and the third feeding point may be on the same vertical side. , Each may be on a different vertical side.

  Next, the operation of the present invention will be described.

  In general, in the reception of the AM radio broadcast wave band, the reception sensitivity is improved as the area of the area surrounded by each element of the antenna is larger, and the AM radio broadcast wave band is surrounded by the antenna element. The number of elements in the region greatly affects the reception sensitivity. The larger the number of elements, the better the reception sensitivity, and further the separation from the metal body can improve the reception sensitivity.

  On the other hand, it is generally well known that the length and shape of an element greatly affect reception of an FM radio broadcast wave band.

  For this reason, when the receiving antenna for the FM / AM radio broadcast wave band is also used, it is necessary to arrange the antenna element in consideration of the balance of the reception sensitivity of the FM radio broadcast wave band and the AM radio broadcast wave band. .

  Furthermore, the first element 12 of the first antenna 10 is provided in a substantially horizontal direction at a position that bisects the top and bottom in the vicinity of the center portion of the side window glass, and the element length of the first element 12 is adjusted. Thus, the reception sensitivity of the radio waves in the FM radio broadcasting wave band can be further improved.

  Further, in receiving the AM radio broadcast wave band, the first antenna 10 is separated from the inner upper side and the inner lower side of the metal flange 2 so as not to be affected by the metal body, so noise is reduced. Thus, even if the area surrounded by the second element 13 is not as large as an AM radio broadcast wave receiving antenna pattern affected by a normal metal body, high-performance reception sensitivity can be maintained.

  Further, the first element for improving the reception sensitivity of the radio wave of the FM radio broadcast wave band can be used for reception of the AM radio broadcast wave band. Further, the first element 12 and the second element 13 are folded back. It is possible to further improve the receiving sensitivity of the AM radio broadcast wave band by adding a strip or a branched horizontal line.

  The second antenna 20 and the third antenna 30 for receiving TV broadcast waves are arranged at positions where the antennas are separated from each other at positions near the upper side and the lower side of the side window glass. Even if these antennas are used for reception in the same frequency band, there is no interference.

  For this reason, it is also possible to perform diversity reception using two TV broadcast wave receiving antennas provided on the same glass surface.

Of course, the antenna of the present invention may be provided on the left or right side window glass of the vehicle and received alone when receiving an AM radio wave or FM radio wave, but when receiving an FM radio wave A glass antenna for receiving an FM radio broadcast wave provided on the other side window glass (an antenna having the structure of the present invention is preferable, but a glass antenna having another structure may be used), or a glass antenna provided on the rear window glass Alternatively, diversity reception may be performed in combination with a glass antenna provided on the front window glass.
[Example]
Hereinafter, the present invention will be described in detail with reference to the drawings.

  Example 1 which is a basic pattern of the present invention and glass antennas of Examples 2 to 6 which are modified examples are provided together with a feeding point on the inner surface of a window glass mounted on a side window for a vehicle. An example will be described.

[Example 1]
FIG. 1 shows a basic embodiment of the present invention, in which a first feeding point 11 provided in the vicinity of a substantially middle portion of a vertical side on one side of a window glass on the rear seat side of a vehicle side portion. Further, a first antenna 10 for receiving AM / FM radio broadcast waves is provided, a second feeding point 21 provided in the vicinity of the upper corner portion and the lower corner portion near the vertical side, and a third feeding point. A second antenna 20 for receiving TV broadcast waves is provided in an upper side region that is an upper side region from the first antenna 10 from the point 31, and a lower side region that is a lower side region than the first antenna 10. Is provided with a third antenna 30 for receiving TV broadcast waves.

  The first antenna 10 is disposed so as to be a substantially central region of the side window glass that is sufficiently separated from the upper side and the lower side of the metal flange 2 of the window frame. A first element 12 composed of a first horizontal line extending in the horizontal direction from the point 11 toward the vertical side on the other side, and an upper and lower side above the first horizontal line near the first feeding point 11 Vertical lines 13c and 13d that branch in the vertical direction in both directions and extend slightly, horizontal lines 13a and 13b that extend in parallel to the first horizontal line from the tip and substantially the same length, and the horizontal lines 13a, It consists of the 2nd element 13 comprised by connecting the front-end | tip part of 13b, and the both ends of the 1st horizontal filament 12 were connected to the 2nd element 13. FIG.

  Three feeding points, the first feeding point 11, the second feeding point 21, and the third feeding point 31, were provided on one side of the vertical side.

  Before bending the glass plate on which the antenna pattern configured in this way is to be bent, each line is screen printed with a conductive material such as silver paste with a line width of 0.5 to 1 mm, It was formed by firing at the same time as bending in a heating bending furnace.

  The length and interval of each conductive wire in Example 1 are as follows.

Distance between first feed point 11 and inner vertical side of metal flange 2 = 30 mm
Length of first element (first horizontal filament) 12 of first antenna 10 = 600 mm
Length of horizontal filaments 13a, 13b of the second element = 600mm
Length of vertical stripes 13c and 13d of the second element = 30 mm
Length from the first feeding point to the vertical line 13c = 20 mm
The length of the second horizontal filament 22 of the second antenna 20 = 500 mm
The distance between the second horizontal filament 22 and the inner upper side of the metal flange 2 = 50 mm
Distance between second horizontal filament 22 and horizontal filament 13a = 100 mm
The length of the third horizontal filament 32 of the third antenna 30 = 450 mm
The distance between the third horizontal filament 32 and the inner lower side of the metal flange 2 = 50 mm
Distance between the third horizontal filament 32 and the horizontal filament 13b = 100 mm
The dimensions of the inner edge of the body flange obtained in this way are the upper side A = 760 mm, the lower side B = 790 mm, the left vertical side C = 320 mm and the right vertical side D = 410 mm as viewed from the inside of the vehicle. Attached to the part window glass.

  FIG. 7 shows a frequency characteristic diagram when a radio wave in the FM radio band in the domestic 76 MHz to 90 MHz band is received by the first antenna of the present invention, and when the reception gain of a standard dipole antenna is 0 dB. The average value of horizontal polarization in the domestic frequency band was −17.8 dB.

  In addition, a frequency characteristic diagram when a domestic 90 MHz to 108 MHz band TV broadcast wave VHF-LOW band radio wave is received by the second antenna and the third antenna is as shown in FIG. , The thick line is a frequency characteristic diagram received by the third antenna, and when expressed as a gain difference when the reception gain of the standard dipole antenna is 0 dB, the average value of the horizontal polarization in the domestic frequency band is The second antenna was -19.8 dB, and the third antenna was -21.1 dB.

  Furthermore, as shown in FIG. 9, the frequency characteristics when the domestic 170 MHz to 220 MHz band TV broadcast wave VHF-HIGH band radio waves are received by the second antenna and the third antenna are as follows. The thick line is the third antenna, and the frequency characteristics received by these two antennas can be expressed as a gain difference when the reception gain of a standard dipole antenna is 0 dB. By value, the second antenna was -20.4 dB and the third antenna was -20.3 dB.

  Furthermore, as shown in FIG. 10, the thin line is the second antenna and the thick line when the frequency characteristics when the TV broadcast wave UHF band radio wave in the domestic 470 MHz to 770 MHz band is received by the second antenna and the third antenna are shown. Is the third antenna, and the frequency characteristics received by these two antennas can be expressed by the gain difference when the reception gain of the standard dipole antenna is 0 dB, and the average value of the horizontally polarized waves in the domestic frequency band Thus, the second antenna was -16.6 dB and the third antenna was -15.2 dB, and both of these were able to be used in practical use.

  Furthermore, for the domestic AM radio band, a receiving gain equivalent to that of a vehicle pole antenna was obtained by amplifying with an amplifier. In the case of the FM radio band, it may be amplified by an amplifier as necessary.

[Example 2]
As shown in FIG. 2, the first feeding point of the first antenna 10 of the first embodiment is provided on the right vertical side, and the first horizontal filament 12 is placed in the left horizontal direction from the first feeding point. The second feeding point 21 of the second antenna and the third feeding point 31 of the third antenna 30 are provided on the left vertical side, and the second horizontal line 22 and the third The horizontal filament 32 is extended in the right horizontal direction.

  The first antenna 10 shown in the present embodiment is a pattern in which the tip of the first element 12 and the tip of the two horizontal filaments 13a and 13b of the second element 13 are opened. This is almost the same as the first embodiment.

  Each pattern of this example was formed by screen printing using a conductive material such as silver paste on the side window glass of the vehicle in the same manner as in Example 1 and firing at the same time as bending in a heating bending furnace.

  The average reception gain in each frequency band of the antenna of the present embodiment is −19.0 dB in the domestic FM radio band by the first antenna 10, and the TV broadcast wave VHF by the second antenna 20 and the third antenna 30. In the -LOW band, -19.5 dB and -21.6 dB, respectively, in the VHF-HIGH band, -20.0 dB and -20.8 dB, respectively, and in the UHF band, -16.8 dB and -15.5 dB, respectively. In both cases, a reception gain that can be practically used was obtained.

[Example 3]
As shown in FIG. 3, the first feeding point 11 of the first antenna 10 of the first embodiment and the second feeding point 21 of the second antenna 20 are provided on the right vertical side, respectively. The first horizontal wire 12, the horizontal wires 13 a and 13 b that constitute the first antenna 10, and the second horizontal wire 22 that constitutes the second antenna 20 from the one feeding point 11 and the second feeding point 21. Are extended in the left horizontal direction, the third feeding point 31 of the third antenna 30 is provided on the left vertical side, and the third horizontal line constituting the third antenna 30 from the third feeding point 31 is provided. The strip 32 is extended in the right horizontal direction.

  Further, the vertical filaments are extended from the tips of the second antenna 20 and the third antenna shown in the present embodiment toward the upper and lower sides of the metal flange, respectively, and the horizontal filaments are extended in both horizontal directions from the respective tips. The other patterns are almost the same as those in the first embodiment.

  Each pattern of this example was formed by screen printing using a conductive material such as silver paste on the side window glass of the vehicle in the same manner as in Example 1 and firing at the same time as bending in a heating bending furnace.

  The average reception gain in each frequency band of the antenna of the third embodiment is −18.0 dB in the domestic FM radio band by the first antenna 10, and the TV broadcast wave VHF by the second antenna 20 and the third antenna 30. In the -LOW band, -19.5 dB and -20.6 dB, respectively, in the VHF-HIGH band, -22.0 dB and -22.8 dB, respectively, and in the UHF band, -17.1 dB and -16.7 dB, respectively. In both cases, a reception gain that can be practically used was obtained.

[Example 4]
As shown in FIG. 4, the first feeding point 11 of the first antenna 10 of the first embodiment and the third feeding point 31 of the third antenna 30 are provided on the right vertical side, respectively. The first horizontal line 12, the horizontal lines 13a and 13b constituting the first antenna 10 and the third horizontal line 32 constituting the third antenna 30 are constituted by the first feeding point 11 and the third feeding point 31, respectively. Each of the second antennas 20 extends in the left horizontal direction, and the second feeding point 21 of the second antenna 20 is provided on the left vertical side, and the second horizontal line that constitutes the second antenna 20 from the second feeding point 21 is provided. 22 and a horizontal filament parallel to this are extended in the right horizontal direction.

  Further, the first antenna 10 shown in the present embodiment connects the tip of the first element 12 and the tip of one horizontal strip 13a of the second element 13 with a vertical strip, and the first element 10 12 is a pattern in which the tip of 12 and the tip of the other horizontal filament 13b of the second element 13 are opened.

  The pattern of the second antenna for receiving TV broadcast waves extends from the second feeding point 21 in the horizontal direction in the horizontal direction, and further on both the upper and lower directions on the horizontal line from the vicinity of the second feeding point. It is branched vertically and provided with a horizontal line parallel to and substantially the same length as the horizontal line from the tip.

  Furthermore, the pattern of the third antenna is bent from the front end of the horizontal line extending in the horizontal direction from the third feeding point to the lower side, and is further provided with a folded line from the tip to the feeding point side. .

  Each pattern of this example was formed by screen printing using a conductive material such as silver paste on the side window glass of the vehicle in the same manner as in Example 1 and firing at the same time as bending in a heating bending furnace.

  The average reception gain in each frequency band of the antenna of this embodiment is −18.5 dB in the domestic FM radio band by the first antenna 10, and the TV broadcast wave VHF by the second antenna 20 and the third antenna 30. -LOW band is -21.5dB and -20.6dB respectively, VHF-HIGH band is -23.0dB and -21.8dB respectively, and UHF band is -20.0dB and -17.5dB respectively. In both cases, a reception gain that can be practically used was obtained.

[Example 5]
As shown in FIG. 5, the first feeding point 11 of the first antenna 10 of the first embodiment, the second feeding point 21 of the second antenna 20, and the third feeding point of the third antenna 30. 31 are provided on the left vertical side, respectively, and the first horizontal wire 12 constituting the first antenna 10 from the first feeding point 11, the second feeding point 21, and the third feeding point 31, respectively. The horizontal filaments 13a and 13b, the second horizontal filament 22 constituting the second antenna 20, and the third horizontal filament 32 constituting the third antenna 30 are respectively extended in the right horizontal direction.

  Further, the first antenna and the third antenna shown in the present embodiment are the same as those in the first embodiment except that the position of the feeding point is reversed left and right. The second antenna 20 divides a vertical line downward from a middle part of a horizontal line extending in the horizontal direction from the feeding point 21 and extends the horizontal line in both the left and right horizontal directions from the tip of the vertical line. is there.

  Each pattern of this example was formed by screen printing using a conductive material such as silver paste on a side window glass of a vehicle in the same manner as in Example 1 and firing at the same time as bending in a heating bending furnace.

  The average reception gain in each frequency band of the antenna of this embodiment is -17.5 dB in the domestic FM radio band by the first antenna 10, and the TV broadcast wave VHF by the second antenna 20 and the third antenna 30. In the -LOW band, it is -19.5 dB and -21.6 dB, respectively, in the VHF-HIGH band, it is -22.5 dB and -20.5 dB, respectively, and in the UHF band, it is -18.1 dB and -14.8 dB, respectively. In both cases, a reception gain that can be practically used was obtained.

[Example 6]
As shown in FIG. 6, the first feeding point 11 of the first antenna 10 of the first embodiment is provided on the left vertical side, and the first horizontal line 12 and the horizontal line 13a from the first feeding point 11 are provided. , 13b are extended in the right horizontal direction, the second feeding point 21 of the second antenna 20 and the third feeding point 31 of the third antenna 30 are provided on the right vertical side, and the second feeding point is provided. The second horizontal line 21 and the third horizontal line 31 are extended in the left horizontal direction from the point 21 and the third feeding point 31, respectively.

  In the first antenna 10 shown in this embodiment, the tip of the first element 12 and the tip of one horizontal line 13b of the second element 13 are connected by a vertical line, and the first element 10 12 is a pattern in which the tip of 12 and the tip of the other horizontal filament 13a of the second element 13 are opened.

  Further, the pattern of the second antenna 20 for receiving TV broadcast waves is such that the second horizontal line 22 extends in the horizontal direction from the second feeding point 21, and further, the middle part on the second horizontal line 22. A vertical line is branched further to the upper side, and a horizontal line is extended from the tip in the horizontal direction opposite to the second feeding point 21.

  Furthermore, the pattern of the third antenna is the same pattern as the third antenna of Example 1 except that the position of the feeding point is reversed left and right.

  Each pattern of this example was formed by screen printing using a conductive material such as silver paste on the side window glass of the vehicle in the same manner as in Example 1 and firing at the same time as bending in a heating bending furnace.

  The average reception gain in each frequency band of the antenna of the present embodiment is −19.0 dB in the domestic FM radio band by the first antenna 10, and the TV broadcast wave VHF by the second antenna 20 and the third antenna 30. −19.2 dB and −21.6 dB for the −LOW band, −21.6 dB and −20.3 dB for the VHF-HIGH band, and −18.5 dB and −15.6 dB for the UHF band, respectively. In both cases, a reception gain that can be practically used was obtained.

[Comparative Example 1]
FIG. 11 shows a conventional antenna pattern provided on the rear seat side window of the vehicle side window.
A first antenna 10 'for AM / FM radio reception is provided in a region occupying about half the area of the upper region of the side window, and a second antenna 20' is provided in a region occupying about half the area of the lower region. The third antenna 30 ′ is provided with two antennas for receiving TV broadcast waves.

  FIG. 12 shows a frequency characteristic diagram when a radio wave in the FM radio band in the domestic 76 MHz to 90 MHz band is received by the first antenna of this comparative example, and the reception gain of the standard dipole antenna is 0 dB. When expressed in terms of gain difference, the average value of horizontal polarization in the domestic frequency band was -21.0 dB.

  In addition, a frequency characteristic diagram when a domestic 90 MHz to 108 MHz band TV broadcast wave VHF-LOW band radio wave is received by the second antenna 20 ′ and the third antenna 30 ′ is as shown in FIG. The thin line is a frequency characteristic diagram received by the second antenna 20 ′ and the thick line is received by the third antenna 30 ′. When the reception gain of the standard dipole antenna is set to 0 dB, the gain difference of the domestic frequency band The average value of the horizontal polarization was 22.9 dB for the second antenna 20 'and -38.0 dB for the third antenna 30'.

  Furthermore, the frequency characteristic diagram when a domestic 170 MHz to 220 MHz band TV broadcast wave VHF-HIGH band radio wave is received by the second antenna 20 ′ and the third antenna 30 ′ is a thin line as shown in FIG. The antenna 20 ′ of 2 and the third antenna 30 ′ are thick lines, and the frequency characteristics received by these two antennas are expressed in terms of gain difference when the reception gain of a standard dipole antenna is 0 dB. The average values of horizontal polarization in the frequency band were −31.3 dB and −23.4 dB, respectively.

  Furthermore, as shown in FIG. 15, the thin line is the second line when the second antenna 20 ′ and the third antenna 30 ′ receive the TV broadcast wave UHF band radio wave in the domestic 470 MHz to 770 MHz band. The frequency characteristic received by these two antennas is expressed as a gain difference when the reception gain of a standard dipole antenna is 0 dB. The average values of the waves were −21.9 dB and −24.1 dB, respectively.

  As described above, according to the result of comparing the reception gains of the respective embodiments of the present invention and the comparative example, it can be seen that the reception gains of the respective embodiments of the present invention are excellent.

  The present invention is used as a glass antenna provided on a side window glass for a vehicle such as an automobile.

The front view which has arrange | positioned the pattern of Example 1 of this invention in the side part window glass. The front view which has arrange | positioned the pattern of Example 2 of this invention in the side part window glass. The front view which has arrange | positioned the pattern of Example 3 of this invention in the side part window glass. The front view which has arrange | positioned the pattern of Example 4 of this invention in the side part window glass. The front view which has arrange | positioned the pattern of Example 5 of this invention in the side part window glass. The front view which has arrange | positioned the pattern of Example 6 of this invention in the side part window glass. The frequency characteristic figure when the electromagnetic wave of FM radio band is received with the 1st antenna of the pattern of Example 1. FIG. The frequency characteristic figure when the radio wave of TV broadcast wave VHF-Low band is received by the 2nd, 3rd antenna of the pattern of Example 1. FIG. The frequency characteristic figure when the radio wave of TV broadcast wave VHF-High band is received by the 2nd, 3rd antenna of the pattern of Example 1. FIG. The frequency characteristic figure when the radio wave of TV broadcast wave UHF band is received by the 2nd, 3rd antenna of the pattern of Example 1. FIG. The front view which has arrange | positioned the conventional pattern to the side window glass. The frequency characteristic figure when the electromagnetic wave of FM radio band is received with the 1st antenna of the conventional pattern. The frequency characteristic figure when the radio wave of TV broadcast wave VHF-Low band is received with the 2nd and 3rd antenna of the conventional pattern. The frequency characteristic figure when the radio wave of TV broadcast wave VHF-High band is received with the 2nd and 3rd antenna of the conventional pattern. The frequency characteristic figure when the radio wave of TV broadcast wave UHF band is received by the 2nd and 3rd antenna of the conventional pattern.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet glass 2 Metal flange 10, 10 '1st antenna 11, 11' 1st feeding point 12 1st element 13 2nd element 13a, 13b Horizontal filament 13c, 13d Vertical filament 20, 20 '2nd Antennas 21, 21 'Second feeding point 22 Second horizontal filaments 30, 30' Third antenna 31, 31 'Third feeding point 32 Third horizontal filaments

Claims (4)

A first feeding point is provided in the vicinity of a substantially middle portion of the vertical side on one side of the vehicle side window glass, and at least a first extending in the horizontal direction from the first feeding point toward the vertical side on the other side. A first antenna for receiving an AM / FM radio broadcast wave having a horizontal line is disposed in a region in the vicinity of the horizontal center line of the window glass, and a second antenna is disposed at an upper side and a lower side in the vicinity of the vertical side. A feed point and a third feed point, and a second antenna for receiving TV broadcast waves having at least a second horizontal line extending in a horizontal direction from the second feed point is provided in the upper side region; A third antenna for receiving TV broadcast waves having at least a third horizontal line extending in a horizontal direction from the third feeding point is provided in a lower side region of the first antenna. Glass antenna for vehicles. The first element for receiving the AM / FM radio broadcast wave has at least a first horizontal line extending in the horizontal direction toward the vertical side on the other side from the first feeding point. And a second vertical line that is branched in a vertical direction from the first horizontal line at or near the first feeding point, and a horizontal line that extends in parallel to the first horizontal line from its tip. The glass antenna for a vehicle according to claim 1, comprising an element. Α (2N−1) λ / 4 (N = 1 or greater integer) where the length of the first element of the first antenna is λ the wavelength of the intermediate frequency of the domestic FM broadcast wave band of 76 to 90 MHz 3. The glass antenna for vehicles according to claim 2, wherein α = wavelength shortening rate by glass). The length of each line of the second antenna and the third antenna is 90 to 108 MHz band TV broadcast wave VHF-LOW, and 170 to 222 MHz band TV broadcast wave VHF-HIGH band intermediate frequency is λ The vehicle glass according to any one of claims 1 to 3, wherein α (2N-1) λ / 4 (where N is an integer equal to or greater than 1 and α is a wavelength reduction rate due to glass). antenna.