JP2012023707A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass antenna for a vehicle which can receive an electromagnetic wave over an entire band within a wide frequency bandwidth for a terrestrial digital radio broadcasting.SOLUTION: A glass antenna for a vehicle comprises:a core wire side feeding point and an earth side feeding point provided in parallel and in proximity to each other on a glass surface near an opening part of a metallic flange of a window of a vehicle; an earth side element including a filament extending in the direction away from the metallic flange positioned the closest to the earth side feeding point; a core wire side element including a core wire side first filament extending from the core wire side feeding point almost in parallel to the filament of the earth side element and a core side second filament diverging from the core side first filament or directly extending from the core side feeding point in parallel to the core side first filament. The length from the core wire side feeding point to the tip of core wire side first filament and the length from the core wire side feeding point to the tip of the core wire side second filament are respectively two separate filament lengths of resonance frequency resonated within one frequency bandwidth.

Description

  The present invention is an antenna capable of receiving with high sensitivity with respect to the entire frequency band in the band 3 of the DAB standard of digital terrestrial radio broadcasting (DAB), particularly a front window for an automobile. This is a non-grounded antenna provided on the glass, the rear window glass, and the side fitting and fixing window.

  In recent years, various radio modulation digital radios with low noise and high quality have been developed in radio broadcasting compared to AM and FM radio broadcasts based on conventional analog modulation schemes, and DAB (Digital Audio Broadcasting) has been developed around the world. , Digital radio broadcasting of various broadcasting standards such as DRM (Digital Radio Monaural), DMB (Digital Multimedia Broadcasting), ISDB (Integrated Services Digital Broadcasting) has been put into practical use.

  Among these various digital radio broadcast standards, the standard that is used in almost all countries except Japan and the United States is the DAB standard, and the frequency band ranges from 174 to 240 MHz and three frequency bands. However, two separate frequency bands of the L band band of 1452 to 1492 MHz are used, and one of the bands is adopted for each country.

  If the resonance frequency is set to be obtained at a certain frequency within a high frequency band such as the L band band of the DAB standard, high reception sensitivity is obtained in a wide band before and after the band centered on the resonance frequency. can get.

  On the other hand, if the resonance frequency is set to be obtained at a certain frequency within a slightly lower frequency band as in the band 3 band, the bandwidth for obtaining high reception sensitivity including the band centered on the resonance frequency is narrowed. There was a tendency to end up.

  Thus, the band 3 having a frequency band of 174 to 240 MHz has a wide bandwidth of 66 MHz, and when there is only one resonance frequency within this band, the bandwidth that can resonate. Therefore, there is a problem that good reception sensitivity cannot be obtained at all frequencies within the band. For this reason, antennas that have been devised in various ways to improve them have been developed.

  For example, in Japanese Patent Application Laid-Open No. 7-46016, a hot-side antenna wire is applied to a window glass in the horizontal direction and electromagnetically with an upper or lower horizontal side of a metal window frame of a vehicle body to which the window glass is attached. The ground side antenna wire is disposed so as to be coupled to the inside of the window glass from the hot side antenna wire, and one end thereof is disposed close to one end or the center of the hot side antenna wire. A window glass antenna for a car phone characterized by being provided is described (Patent Document 1).

  Further, Japanese Patent Application Laid-Open No. 2000-295023 discloses a resin film, a composite antenna element formed of a strip-shaped thin film conductor formed on the surface of the resin film, and a power feeding portion of the composite antenna element. The composite antenna element is provided with a first antenna element provided so as to be adapted to the first frequency band, and the first frequency band is provided in combination with the first antenna element. The second antenna element is provided so as to be adapted to the second frequency band having a lower frequency level, and the second antenna element is based on the electromagnetic wave in the first frequency band generated on the element. A DAB film antenna is described which is bent at the zero level point portion of the current distribution (Patent Document 2).

  Furthermore, JP 2001-127519 A discloses an antenna side window glass antenna in which an antenna conductor, a ground conductor, a feeding point of the antenna conductor and a ground point of the ground conductor are provided on the side window glass plate of the automobile, When viewed from the inside or outside of the vehicle, the feeding point and the grounding point are disposed near the right edge of the side window glass plate, and the grounding point is disposed substantially above the feeding point, and the antenna conductor is the feeding point. Is extended in a clockwise direction along the peripheral edge of the side window glass plate and around the side conductor so as to go around the side window glass plate, and the earth conductor is connected to the earth point or the earth point. An upper ground element that extends approximately to the left starting from the attached connection ground element, and a watch that starts from the ground point or connection ground element. Ri automobile side window glass antenna characterized in that it comprises a lower ground elements which extend in the direction is described (Patent Document 3).

  Furthermore, in Japanese Patent Application Laid-Open No. 2009-49706, an antenna for receiving a terrestrial digital TV broadcast wave provided in a corner portion of a window glass on the rear seat side of an automobile, near the corner portion of the side window glass. A first vertical wire provided with two feeding points of a positive electrode and a negative electrode, and at least one of the at least two wires extending from the feeding point of the positive electrode; A first element consisting of a first horizontal line branched from the tip or middle of the vertical line and extending in the horizontal direction, and at least two second horizontal lines extending in the horizontal direction from the feeding point of the negative electrode And a second element consisting of a second vertical wire extending in the vertical direction from the feed point of the negative electrode, and a coaxial cable core and a sheath conductor at each of the positive and negative feed points The Glass antenna for a vehicle, characterized in that the continued, non-grounded type antenna is described (Patent Document 4).

JP 7-46016 A JP 2000-295023 A JP 2001-127519 A JP 2009-49706 A

  The invention of Patent Document 1 is not a DAB standard terrestrial digital radio broadcast wave antenna, but a window glass antenna for a car phone having a frequency of 810 MHz to 960 MHz. From the hot side antenna line and the ground side antenna line In this non-grounded antenna, the hot wire is electromagnetically coupled to the horizontal side of the metal window frame. However, if this window glass antenna for a car phone is used as an antenna in the frequency band of the band 3 of the DAB standard, there is only one hot side filament effective for widening the band. There is a problem that a high reception gain cannot be obtained over the entire band.

  Patent Document 2 describes an antenna pattern that can resonate in two bands of two different frequency bands, the band 3 and the L band of the digital radio broadcast wave reception standard, and can receive over both bands. However, there is a problem that the reception sensitivity is not made high for all frequency bands within one wide frequency bandwidth, and there is no ground side element, so that it is easily affected by noise from the defogger and metal body. was there.

  Further, the antenna disclosed in Patent Document 3 is not a DAB standard antenna for receiving terrestrial digital radio broadcast waves in a wide band 3 or L band in the frequency band, but is an FM radio having a frequency of 76 MHz to 90 MHz. It is a window glass antenna for receiving broadcast waves, and is composed of one antenna conductor provided so as to surround the earth conductor. When this antenna is used for receiving terrestrial digital radio broadcast waves in the band 3 of the DAB standard, There was a problem that a high reception gain could not be obtained over the entire band 3.

  The antenna shown in Patent Document 4 is not a DAB standard antenna for receiving terrestrial digital radio broadcast waves, but a non-grounded window glass antenna for receiving terrestrial digital broadcast waves having a frequency of 470 to 710 MHz. A first vertical wire in which at least one of at least two wires extending from the feeding point of the positive electrode on the core wire side extends vertically toward the corner direction, and the tip of the first vertical wire or This pattern is arranged along the inner vertical side of a metal flange that branches off from the middle and extends in the horizontal direction. When used for digital terrestrial television, there is no problem in reception characteristics, but there are three bands of DAB standards. When used as an antenna for terrestrial digital radio in the L band or the L band, the element on the core side is close to the metal flange. The result susceptible, there has been a problem that invites deterioration of reception characteristics.

  In the present invention, in receiving DAB standard digital radio broadcast, each of the frequency bands of 174 to 240 MHz, the frequency band of 174 to 240 MHz, or the frequency band of the L band of 1452 to 1492 MHz, The object is to obtain a satisfactory reception sensitivity in the entire bandwidth.

  That is, the present invention relates to a glass antenna for a non-grounded vehicle capable of receiving radio waves over the entire band within the frequency band of three bands for terrestrial digital radio broadcast waves of the DAB standard. A wire extending in a direction away from the core-side feeding point and the ground-side feeding point arranged in close proximity to each other on the glass surface near the opening of the metal flange and the metal flange located closest to the ground-side feeding point. Including a grounding side element, a core wire side first wire extending substantially parallel to the wire of the grounding side element from the core wire side feeding point, and branching from the core wire side first wire or directly from the core wire side feeding point A core wire-side element including a core wire-side second wire extending in parallel with the side first wire, and each tip of the core wire-side first wire and the core wire-side second wire from the core wire-side feeding point Up to the length of each One of which is a glass antenna for a vehicle, characterized in that the streak length of the two separate resonance frequency resonates in the frequency bandwidth.

  Alternatively, in the present invention, the core wire side first wire and the core wire side second wire and the wire of the grounding side element are bent so that the respective wires do not intersect each other at an arbitrary position. The vehicle glass antenna described above.

  Alternatively, the present invention provides the above-described glass antenna for vehicles, wherein the length of the resonating filament is αλ / 4 where α is a wavelength shortening rate of the glass and λ is a wavelength of the resonance frequency. is there.

  Alternatively, the present invention is the above-described glass antenna for a vehicle, wherein the ground side element is a rectangular closed loop wire.

  Alternatively, the present invention is the glass antenna for a vehicle described above, characterized in that a substantially rectangular closed-loop line is formed by connecting the tip of the second line of the core-wire-side element to the first line. is there.

  Alternatively, when the present invention is provided near the horizontal side of the opening of the metal flange and in the vicinity of the corner, the grounding side feeding point is provided near the corner and the core side feeding point is provided near the horizontal side away from the corner. This is the glass antenna for a vehicle described above.

  Alternatively, in the present invention, when the metal flange is provided in the vicinity of the vertical side of the opening of the metal flange and in the vicinity of the corner, the ground side feeding point is provided near the corner and the core side feeding point 6 is provided in the vicinity of the vertical side away from the corner. This is the glass antenna for a vehicle described above.

  Alternatively, the present invention is the above-described vehicle glass antenna, wherein the terrestrial digital radio broadcast wave receiving antenna is provided in the vicinity of the upper side of the opening of the metal flange of the front window glass of the automobile.

  Alternatively, the present invention is the glass antenna for a vehicle described above, wherein the antenna for receiving a terrestrial digital radio broadcast wave is provided in the vicinity of the corner of the opening of the rear window glass of the automobile.

  Alternatively, the present invention is the glass antenna for a vehicle described above, wherein the antenna for receiving a terrestrial digital radio broadcast wave is provided in an opening of a window glass by fitting the side part of the automobile.

  Alternatively, in the present invention, the antenna pattern of the present invention is created by printing a conductive material on a transparent resin film or sheet having an adhesive surface, or by attaching a wire wire or the like, and sticking it to a window glass surface of an automobile. The glass antenna for a vehicle according to any one of the above-described features.

  Like the DAB standard band 3 of the present invention, although the frequency band is as low as 174 to 240 MHz, the bandwidth is as wide as 66 MHz, and resonance occurs only at one resonance frequency of the center frequency of this band. In this case, there is a band that cannot be resonated because the bandwidth at which resonance of a certain level or more is obtained is narrow. However, according to the present invention, two resonance frequencies at which reception characteristics peak within the same bandwidth are separated by two. As described above, compared to the case where there is only one resonance frequency, there is no band with low reception sensitivity at a frequency within the same bandwidth far from the resonance frequency, and good reception characteristics can be obtained in the entire band. It became so.

The front enlarged view of the antenna pattern of Example 1 of this invention. The front enlarged view of the antenna pattern of Example 2 of this invention. The front enlarged view of the antenna pattern of Example 3 of this invention. The front enlarged view of the antenna pattern of Example 4 of this invention. The front enlarged view of the antenna pattern of Example 5 of this invention. The front enlarged view of the antenna pattern of Example 6 of this invention. The front enlarged view of the antenna pattern of Example 7 of this invention. The figure which provided the antenna pattern of Example 1 of this invention in the front window glass of the motor vehicle. The figure which provided the antenna pattern of Example 1 of this invention in the front window glass of the motor vehicle. The figure which provided the antenna pattern of Example 1 of this invention in the rear window glass of the motor vehicle. The front enlarged view of the antenna pattern of the comparative example 1. FIG. The frequency characteristic figure in the band 3 of the DAB specification of Example 1 and Comparative Example 1 of the present invention. The front enlarged view of the antenna pattern of Example 8 of this invention. The figure which provided the antenna pattern of Example 8 of this invention in the front window glass of the motor vehicle. The frequency characteristic figure in the band 3 of the DAB specification of Example 8 of this invention and the comparative example 1. FIG.

  The present invention is a non-grounding glass for receiving a DAB standard terrestrial digital radio broadcast wave composed of a core-side element 10 extending from a core-side feeding point 6 and a ground-side element 20 extending from a ground-side feeding point 7. It is an antenna.

  The core wire side feeding point 6 and the grounding side feeding point 7 are arranged adjacent to each other on the glass surface along the opening side of the metal flange of the automobile window, and the distance between each feeding point and the metal flange 3 is almost equal. It arrange | positions so that it may become the same. The core wire side element 10 extending from the core wire side feed point and the ground side element 20 extending from the ground side feed point are in a direction away from the opening side of the metal flange 3 at the closest position, that is, a substantially central portion of the glass plate. Extend in parallel to each other.

  The core wire side element 10 and the ground side element 20 are extended from the core wire side feed point 6 and the ground side feed point 7 so as to be parallel to each other, but may be bent so as not to cross each other at an arbitrary place. .

<When installing on the top side of a metal flange>
That is, when the antenna of the present invention is provided at the upper side position or the lower side position excluding the position near the corner of the opening of the metal flange 3, the filaments of the core wire side element 10 and the ground side element 20 are connected to the substantially central portion of the glass plate. However, the positions of the filaments of the core wire side element 10 and the grounding side element 20 may be changed to the left and right.

  In the case where the antenna of the present invention is disposed at the upper side or the lower side position near the corner of the opening of the metal flange among these upper side or lower side positions, the core wire side element 10 provided in the vertical direction of the antenna of the present invention. As the position of each line of the ground side element 20, the ground side element 20 is disposed on the side close to the corner of the metal flange 3, and the core side element 10 is separated from the corner of the opening of the metal flange 3. It arranged so that it might become.

<When placed on the vertical side of the opening of the metal flange>
On the other hand, when the antenna of the present invention is provided on the vertical side excluding the position in the vicinity of the corner of the opening of the metal flange 3, that is, in the middle portion of the vertical side, the filaments of the core wire side element 10 and the ground side element 20 are Although it is provided extending in the horizontal direction toward the substantially central portion of the glass plate, the positions of the filaments of the core wire side element 10 and the ground side element 20 may be arranged with their positions being changed up and down.

  In the case where the antenna of the present invention is disposed at the position of the vertical side of the metal flange 3 near the corner of the opening of the metal flange, the core wire side element provided in the horizontal direction of the antenna of the present invention 10 and the grounding side element 20, the grounding side element 20 is horizontally disposed on the side close to the corner of the metal flange, and the core side element 10 is positioned away from the corner of the metal flange 3. It was arranged horizontally.

  The ground side element 20 is a ground side first wire 21 extending in a direction away from the metal flange 3 located closest to the ground side feed point 7, and the core line side element 10 is connected to the core side feed point 6. The core wire side first wire 11 extending substantially parallel to the wire of the grounding side element 20 and the middle portion of the core wire side first wire 11 or the core wire side first wire 11 from the core wire side feeding point 6. The core wire side second wire 13 extends in parallel to the core wire side first wire 11 through an orthogonal wire wire extending in a direction orthogonal to the core wire side, and the core wire side feed point 6 to the core wire side The lengths to the tips of the first wire 11 and the core-wire-side second wire 13 are the wire lengths determined by the wavelengths of the two separated resonance frequencies that resonate within the frequency bandwidth of the band 3, respectively. .

  Further, the core wire side first wire 11 and the core wire side first wire 12 of the core wire side element 10 are arranged at positions separated from the metal flange 3 so as not to be affected by the metal flange 3. Alternatively, the ground side element is disposed between the metal flange 3 and the core wire side element 10.

  As described above, within the band 3 bandwidth of the DAB standard, the frequency at which the reception sensitivity is increased most by the length of the first wire on the core line side and the reception sensitivity is increased by the resonance most at the second line on the core side. By providing the strips having lengths that resonate at two separate frequencies, which are higher frequencies, radio waves can be suitably received over a wide band within the band 3 bandwidth.

  As described above, it has been described that the DAB standard frequency band can be suitably received in the band 3 band of 174 to 240 MHz. However, the present invention is not limited to this, and the L band band of 1452 to 1492 MHz, which is another frequency band of the DAB standard. Can be received without problems.

  The length of the core wire side first wire and the length of the core wire side second wire means the length from the core wire side feeding point to the respective ends of the core wire side first wire and the core wire side second wire.

  The resonating filament length is expressed as αλ / 4 where α is the wavelength shortening rate of the glass and λ is the wavelength of the resonance frequency.

  Further, the grounding side element is not limited to a linear shape, and may be a rectangular closed loop line as shown in FIG.

  Furthermore, as shown in FIG. 6, the vicinity of the tip of the second filament of the core wire element may be connected to the first filament to form a substantially rectangular closed loop filament.

<When the antenna of the present invention is provided on the front window glass of an automobile>
Furthermore, as shown in FIGS. 8 and 9, when the antenna of the present invention is provided on the front window glass of an automobile, an opening portion of a metal flange is provided so as not to obstruct the driver's front view. It is preferable to provide in the vicinity of the upper side of the opening, and in particular, the position of the upper side excluding the vicinity of the corner of the opening is preferable.

  As shown in FIG. 8, the antenna provided in the vicinity of the upper side of the opening has the core-side element 10 and the ground-side element 20 extending from the core-side feeding point 6 and the ground-side feeding point 7, respectively, in the approximate center of the glass plate. It extended to the direction perpendicular | vertical and parallel to each other.

  This extends each of the core wire side element 10 and the ground side element 20 in a direction away from the core wire side feed point and the metal flange closest to the ground side feed point, that is, in the direction of the center of the glass plate. As a result, the adverse effect of the metal body was reduced.

  As shown in FIG. 9, in particular, when the antenna of the present invention is disposed near the corner of the opening of the metal flange, it is closer to the corner on the vertical side of the opening of the metal flange 3. By disposing the grounding side element 20 at the position and disposing the core wire side element 10 on the side away from the side, adverse effects such as noise from the metal body can be blocked by the grounding side element.

  Of course, as shown in FIG. 8, in the case where the antenna of the present invention is provided at the center position on the upper side away from the corner portion of the opening of the metal flange 3, it is separated from the vertical side of the metal flange. Therefore, either the core wire side element 10 or the ground side element 20 may be on the vertical side.

  Further, as shown in FIG. 14, if the core wire side element 10 and the grounding side element 20 are bent at an arbitrary position of each element so as not to cross each other, the driver's field of view is simply made parallel to each element. Since it can ensure widely than the case where it extends, it becomes more preferable embodiment.

<When the antenna of the present invention is provided on the rear window glass of an automobile>
Furthermore, as shown in FIG. 10, when the antenna of the present invention is provided on the rear window glass of an automobile, in most cases, the rear window glass has the defogger 4 or the upper margin of the defogger 4 In many cases, another antenna (not shown) is provided at the center of the lower margin, so that it must be provided near the four corners of the opening of the metal flange 3. However, if each element of the antenna of the present invention is arranged in the vertical direction, depending on the length of the element, there is a possibility of interfering with the defogger 4. Therefore, the elements 20 and 30 of the antenna of the present invention are arranged in the horizontal direction. It is desirable to do.

  For this reason, in the vicinity of the corners of the four corners of the opening of the metal flange 3, the ground side feeding point and the core wire side feeding point are provided in order from the side close to the corner on the vertical side excluding the corner, and the ground side element 20 and the core side Each filament of the element 10 was provided so as to extend in the horizontal direction away from the vertical side of the flange.

  The ground side feed point 7 and the core wire side feed point 6 are provided in order from the side near the corner, and the ground side element 20 and the core wire side element 10 are provided in the horizontal direction from the respective feed points. This is because the ground-side element 20 can block adverse effects such as noise from the metal body flange 3 by moving away from the horizontal side of the metal flange 3.

  Further, each of the core wire side element 10 and the ground side element 20 is placed in the horizontal direction away from the vertical side of the metal flange located closest to the core wire side feed point and the ground side feed point, that is, in the central direction of the glass plate. The reason for extending the length is to reduce adverse effects such as noise caused by the metal body.

<When the antenna of the present invention is provided on a side window glass of an automobile>
When the antenna of the present invention is provided on the side window glass of an automobile, the core side feeding point and the grounding side feeding point are arranged in parallel along all the opening sides except for the corner portion of the metal flange of the side fitting window. Can be provided.

  Further, the antenna of the present invention provided along the upper side or the lower side excluding the corner of the opening of the metal flange 3 has the core wire side element 10 and the ground side element 20 respectively extending from the core wire side feed point 6 and the ground side feed point 7. The glass plate extends substantially in the vertical direction and substantially parallel to the substantially central portion of the glass plate.

  Furthermore, the antenna of the present invention provided along the vertical side excluding the corner of the opening of the metal flange 3 has a core wire side element 10 and a ground side element 20 extending from the core wire side feed point 6 and the ground side feed point 7 respectively. The glass plates extend in a substantially horizontal direction and substantially parallel to each other toward a substantially central portion of the glass plate.

  Furthermore, in the case where the antenna of the present invention is disposed in the vicinity of the corner portion on the upper side or the lower side of the opening portion of the metal flange, the antenna is grounded on the side close to the vertical side of the opening side of the metal flange 3 on the corner side. By disposing the side element 20 and disposing the core wire side element 10 on the side away from the side, adverse effects from the metal body can be blocked by the ground side element.

  Similarly, when the antenna of the present invention is disposed in the vicinity of the corner of the vertical side of the opening of the metal flange, the side of the opening of the metal flange 3 close to the horizontal side (the corner The ground-side element 20 is disposed on the other side, and the core-wire-side element 10 is disposed on the side away from the horizontal side, whereby adverse effects from the metal body can be blocked by the ground-side element.

  In addition, the line width of the core wire side element 10 and the grounding side element is approximately 0.3 to 0.8 mm.

  The central conductor of the coaxial cable is connected to the core wire side feed point 6 of the antenna for receiving the terrestrial digital radio broadcast wave, and the outer conductor of the coaxial cable is connected to the ground side feed point.

  Such a glass antenna for digital terrestrial radio broadcasting is located in the vicinity of the upper side excluding the vicinity of the corner of the opening of the metal flange of the front window of the automobile as shown in FIG. 8, or in the automobile as shown in FIG. Position near the corner of the upper side of the opening of the metal flange of the front window, or, as shown in FIG. 10, a horizontal side or vertical side of the corner of the metal flange of the rear window glass, or a side part not shown. If it is provided on any one of the upper side, the lower side, and the side except the corner portion of the metal flange of the killing fixed window, a good reception gain can be obtained by itself.

  If the diversity reception is provided in combination with other antennas for receiving terrestrial digital radio broadcast waves, it is possible to improve the reception gain even for radio waves coming from the side of the vehicle. The directivity can be improved.

  In the case where an insulating ceramic paste layer 2 colored in black or the like is printed on the periphery of the glass plate as the window glass 1 for an automobile, the ceramic paste layer 2 is dried and then digital By arranging the core-side feed point 6 and the ground-side feed point 7 of the radio antenna on the ceramic paste layer 2, the feed points 6 and 7 of the antenna become invisible from the outside of the vehicle, thereby improving the appearance. It is preferable.

  In addition, the antenna pattern of the present invention as described above is produced by printing a conductive material on a transparent resin film or sheet having an adhesive surface, or by attaching a wire filament, etc. It can also be made to affix on the window glass surface and various panels.

  Furthermore, the antenna pattern of the present invention is created by printing with a conductive material on a transparent resin film or sheet having an adhesive surface, or by sticking a wire wire or the like, and is attached to the window glass surface of an automobile. Also good.

  Each example of the present invention will be described below.

[Example 1]
The antenna according to the first embodiment of the present invention as shown in FIG. 1 is disposed on the glass surface near the vertical side of the opening of the metal flange 3 in the upper margin of the defogger 3 of the rear window glass 1 of the automobile. . The antenna is a non-grounded terrestrial digital radio antenna composed of two elements, a core wire side element 10 and a ground side element 20.

  The ground-side element 20 has a ground-side first filament 21 having a length of 50 mm facing the horizontal direction away from the vertical side of the opening of the metal flange 3 from the upper side of a square ground-side feeding point 7 having a length and width of 12 mm. Provided.

  On the other hand, the core wire side element 10 is a first wire on the core wire side having a length of 120 mm from the upper side of a square core wire side feeding point 6 having a length and width of 12 mm toward the horizontal direction away from the vertical side of the opening of the metal flange 3. A strip 11 is provided, and further, a perpendicular branch 12 having a length of 25 mm is extended from a middle portion of the core-wire-side first wire 11 toward the ground-side element 20, and the core-wire-side first is extended from the tip. A 25 mm core wire side second wire 13 was provided in the same direction as the direction in which the wire extends.

  The branch position of the first orthogonal wire 12 from the core wire side first wire is a position having a length of 10 mm from the end of the core wire side feed point 6, and the core wire side feed point 6 and the ground side feed point 7 are The interval is 18 mm.

  Each wire of each of the core wire side element 10 and the ground side element 20 and each feeding point is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate with a width of 0.7 mm for each wire, After drying, it was baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Example 1 thus prepared is provided on the rear window glass of the automobile, and the center conductor of the coaxial cable extended from a tuner (not shown) is connected to the core wire side feed point 6. The conductor was connected to the ground-side feeding point 7 and received as an antenna of the band 3 terrestrial digital radio broadcast wave band with a frequency of 174 to 240 MHz.

  FIG. 12 shows frequency characteristics in three bands obtained by the pattern of Example 1 (see FIG. 1) and the pattern of Comparative Example 1 (see FIG. 11) described later.

  As shown in FIG. 12, the reception sensitivity of the pattern of the first embodiment of the present invention indicated by the solid line is higher than the reception sensitivity of the pattern of the first comparative example indicated by the dotted line over the entire frequency band of band 3. It can be seen that sensitivity is obtained.

[Example 2]
The antenna pattern of Example 2 shown in FIG. 2 is disposed on the glass surface near the vertical side of the opening of the metal flange 3 in the upper margin of the defogger 3 of the rear window glass 1 of the automobile. Compared with the antenna pattern of Example 1 shown in FIG. 1, the pattern is different in that the second filament of the core wire side element 10 extends directly from the core wire side feed point 6 in the vertical direction, The lengths of the orthogonal wires 12 of the core wire side element 10 and the lengths of the core wire side second wires 13 are different between the first embodiment and the second embodiment. However, the total length of the wire from the core wire side feeding point 6 to the tip of the core wire side second wire is 60 mm, which is substantially the same length in the first and second embodiments.

  Moreover, the length of the core wire side 1st filament 11, the length of the earthing | grounding side element 20, and the space | interval between two feeding points are the same as Example 1. FIG.

  The antenna of Example 2 was printed with a conductive ceramic paste at a predetermined position on the indoor side of the window glass plate in the same manner as in Example 1, dried, and then baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Example 2 created in this way is provided on the rear window glass of the automobile, and the central conductor of the coaxial cable extended from the tuner (not shown) is connected to the core wire side feeding point 6. When the conductor is connected to the ground-side feeding point 7 and received as an antenna in the terrestrial digital radio broadcast wave band of the band 3 of frequency 174 to 240 MHz, satisfactory reception sensitivity is obtained as in the first embodiment, and sufficient. It was at a practical level.

[Example 3]
In Example 3 shown in FIG. 3, the core wire side feeding point 6 and the grounding side feeding point 7 of the antenna of the present invention are provided in the vicinity of the upper side of the opening portion of the metal flange of the front window glass of the automobile. The first embodiment is different from the first and second embodiments in which the core wire side element 10 and the grounding side element 20 are extended in the horizontal direction from the feeding points 6 and 7 in that the core wire side element 10 and the grounding side element 20 are extended in the vertical direction. ing.

  Furthermore, compared with the pattern of Example 2 shown in FIG. 2, the core wire side second filament of the core wire side element 10 extending vertically downward from the core wire side feed point is directly open from the core wire side feed point 6 to the metal flange 3. It is different in that it extends to the left away from the vertical side of the part, extends from its tip in the direction parallel to the first core wire and extends in the direction of the first core wire.

  On the other hand, the ground-side element 20 extending in a direction away from the metal flange from the ground-side feeding point 7 is the same.

  The antenna was printed with a conductive ceramic paste at a predetermined position on the indoor side of the window glass plate in the same manner as in Example 2, dried, and baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of the third embodiment created in this way is provided on the front window glass of the automobile, and the central conductor of the coaxial cable extended from a tuner (not shown) is connected to the feeding point 6 on the core wire side. When the outer conductor is connected to the ground-side feeding point 7 and received as an antenna in the band 3 terrestrial digital radio broadcast wave band of frequency 174 to 240 MHz, the satisfactory receiving sensitivity is obtained as in the second embodiment. And was at a practical level.

[Example 4]
The antenna pattern of Example 4 shown in FIG. 4 is disposed on the glass surface near the vertical side of the opening of the metal flange 3 in the upper margin of the defogger 3 of the rear window glass 1 of the automobile. Compared with the antenna pattern of the first embodiment shown in FIG. 1, an orthogonal wire 12 is provided in which the second wire 13 of the core wire side element 10 branches vertically downward from the middle portion of the core wire first wire 11, and its tip The difference is that the core-wire-side second filament 13 is extended in parallel to the core-wire-side first filament 11, and the other points are the same as in the first embodiment.

  The antenna of Example 4 was printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 1, dried, and baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Example 4 created in this way is provided on the rear window glass of the automobile, and the central conductor of the coaxial cable extended from the tuner (not shown) is connected to the core wire side feed point 6. When the conductor is connected to the ground-side feeding point 7 and received as an antenna in the terrestrial digital radio broadcast wave band of the band 3 of frequency 174 to 240 MHz, satisfactory reception sensitivity is obtained as in the first embodiment, and sufficient. It was at a practical level.

[Example 5]
The antenna pattern of Example 5 shown in FIG. 5 is disposed on the glass surface of the vertical side of the opening of the metal flange 3 in the upper margin of the defogger 3 of the rear window glass 1 of the automobile. Unlike the second embodiment, the core-side element 10 is the same as the second embodiment in that the ground side element 20 has a closed loop shape compared to the antenna pattern of the second embodiment shown in FIG.

The closed loop-shaped grounding side element 20 has a rectangular shape in which the tips of two horizontal filaments extending in the horizontal direction while maintaining the width of the grounding side feeding point 7 are connected.
The antenna of Example 5 was printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 2, dried, and then baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Example 5 created as described above is provided on the rear window glass of the automobile, and the central conductor of the coaxial cable extended from a tuner (not shown) is connected to the core-side feeding point 6. When the conductor is connected to the ground-side feeding point 7 and received as an antenna of the band 3 terrestrial digital radio broadcast wave band of the frequency 174 to 240 MHz, the satisfactory reception sensitivity is obtained in the same manner as in Example 2 and sufficient. It was at a practical level.

[Example 6]
The antenna pattern of Example 6 shown in FIG. 6 is disposed on the glass surface near the vertical side of the opening of the metal flange 3 in the upper margin of the defogger 3 of the rear window glass 1 of the automobile. Compared to the antenna pattern of Example 2 shown in FIG. 2, the tip of the second wire extending from the tip of the orthogonal wire branched from the middle of the first wire of the core wire side element 10 is connected to the first wire. And the point which formed the rectangular-shaped part differs.

  Further, the length of the core wire side first wire 11 of the core wire side element, the length of the grounding side element 20, and the interval between the two feeding points are the same as in the second embodiment.

  The antenna of Example 6 was printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 1, dried, and baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Example 6 created in this way is provided on the rear window glass of the automobile, and the central conductor of the coaxial cable extended from the tuner (not shown) is connected to the core wire side feeding point 6. When the conductor is connected to the ground-side feeding point 7 and received as an antenna of the band 3 terrestrial digital radio broadcast wave band of the frequency 174 to 240 MHz, the satisfactory reception sensitivity is obtained in the same manner as in Example 2 and sufficient. It was at a practical level.

[Example 7]
The antenna pattern of Example 2 shown in FIG. 7 is disposed on the glass surface near the vertical side of the opening of the metal flange 3 in the upper margin of the defogger 3 of the rear window glass 1 of the automobile. Compared with the antenna pattern of Example 2 shown in FIG. 2, the arrangement positions of the orthogonal wire 12 and the core wire side second wire 13 of the core wire side element 10 are different. In other words, the difference is that the core-wire-side second filament is extended in both the left and right directions from the tip of the orthogonal filament 12 branched so as to be orthogonal to the middle portion of the core-wire-side first filament.

  On the other hand, the core wire side first filament 11, the grounding side element 20 and the like are the same as those in the second embodiment.

  In the same manner as in Example 2, the antenna of Example 7 was printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate, dried, and baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Example 7 thus prepared is provided on the rear window glass of the automobile, and the center conductor of the coaxial cable extended from the tuner (not shown) is connected to the core-side feeding point 6. When the conductor is connected to the ground-side feeding point 7 and received as an antenna of the band 3 terrestrial digital radio broadcast wave band of the frequency 174 to 240 MHz, the satisfactory reception sensitivity is obtained in the same manner as in Example 2 and sufficient. It was at a practical level.

[Example 8]
In Example 8 shown in FIG. 13, the core wire side feeding point 6 and the grounding side feeding point 7 of the antenna of the present invention are provided in the vicinity of the upper side of the opening of the metal flange of the front window glass of the automobile, and each feeding point is provided. The core wire side element 10 and the ground side element 20 are extended vertically from each other, and each element is bent at a right angle at an arbitrary position. This is different from Example 7 in which the straight line is extended in the direction. However, the length of each filament is the same as Example 7.

  Each wire and each feeding point of the core wire side element 10 and the grounding side element 20 are printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate with a width of 0.7 mm and dried. After that, it was baked by a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Example 8 created in this way is provided on the front window glass of the automobile, and the center conductor of the coaxial cable extended from a tuner (not shown) is connected to the core wire side feeding point 6. The outer conductor was connected to the ground-side feeding point 7 and received as an antenna of the band 3 terrestrial digital radio broadcast wave band having a frequency of 174 to 240 MHz.

  FIG. 15 shows frequency characteristics in three bands obtained by the pattern of Example 8 (see FIG. 13) and the pattern of Comparative Example 1 (see FIG. 11) described later.

  As shown in FIG. 15, the reception sensitivity of the pattern of the eighth embodiment of the present invention indicated by the solid line is higher than the reception sensitivity of the pattern of the comparative example 1 indicated by the dotted line over the entire frequency band of the band 3. It can be seen that sensitivity is obtained.

  As mentioned above, although demonstrated by the preferable Example, this invention is not limited to these, A various application is possible.

[Comparative Example 1]
Comparative Example 1 shown in FIG. 11 has only the core-wire-side first filament (see FIG. 1) having a length that resonates at an intermediate frequency of three bands shown in Example 1 as core-wire-side element 10 ′. The grounding side element 20 has the same pattern as that of the first embodiment.

  The antenna of Comparative Example 1 was printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 1, dried, and then baked in a heating furnace.

  The terrestrial digital radio broadcast wave receiving antenna of Comparative Example 1 created in this way is provided on the rear window glass of the automobile, and the central conductor of the coaxial cable extended from the tuner (not shown) is connected to the feeding point 6 on the core wire side to the outer sheath. The conductor is connected to the ground-side feeding point 7 and received as an antenna in the band 3 terrestrial digital radio broadcast wave band of frequency 174 to 240 MHz. As shown by the thin dotted line in FIG. It was clear that the characteristics of Example 1 indicated by the thick dotted line are excellent.

DESCRIPTION OF SYMBOLS 1 Window glass 2 Ceramic paste layer 3 Metal flange 4 Defogger 6 Core wire side feeding point 7 Grounding side feeding point 10, 10 'Core wire side element 11 Core wire side 1st wire 12 Orthogonal wire 13 Core wire side 2nd wire 20 Grounding side Element 21 Ground side first wire

Claims (11)

In a glass antenna for a non-grounded vehicle that can receive radio waves over the entire frequency band within the three frequency bands of the DAB standard terrestrial digital radio broadcast wave,
A core-side feeding point and a grounding-side feeding point that are arranged in close proximity to each other on the glass surface in the vicinity of the opening of the metal flange of the automobile window;
A ground-side element including a wire extending in a direction away from the metal flange located closest to the ground-side feeding point;
A core-wire-side first wire extending substantially parallel to the ground-side element wire from the core-wire-side feeding point, a branch from the core-wire-side first wire, or a core-wire-side first wire directly from the core-wire-side feeding point; A core wire side element including a core wire side second wire extending in parallel,
The lengths from the core wire side feeding point to the respective tips of the core wire side first wire and the core wire side second wire are respectively separated from each other within the one frequency bandwidth. The glass antenna for vehicles characterized by the above-mentioned.   The core wire side first wire, the core wire side second wire, and the wire of the grounding side element are bent at arbitrary locations so that the wires do not intersect each other. Item 2. The glass antenna for a vehicle according to Item 1.   The glass antenna for a vehicle according to claim 1 or 2, wherein the length of the resonating filament is αλ / 4 where α is a wavelength shortening rate of the glass and λ is a wavelength of the resonance frequency.   The glass antenna for a vehicle according to any one of claims 1 to 3, wherein the ground side element is a rectangular closed-loop line.   The vehicle according to any one of claims 1 to 4, wherein a tip end portion of the second wire of the core wire side element is connected to the first wire to form a substantially rectangular closed-loop wire. Glass antenna.   The ground-side feeding point is provided near the corner and the core-side feeding point is provided near the horizontal side away from the corner when the metal flange is provided near the horizontal side of the opening of the metal flange and in the vicinity of the corner. The glass antenna for vehicles as described in any one of 1 thru | or 5.   The ground-side feeding point is provided near the corner and the core-side feeding point is provided near the vertical side away from the corner when the metal flange is provided near the vertical side of the opening of the metal flange and in the vicinity of the corner. The glass antenna for vehicles as described in any one of 1 thru | or 5.   6. The vehicle glass according to claim 1, wherein the antenna for receiving the terrestrial digital radio broadcast wave is provided in the vicinity of the upper side of the opening of the metal flange of the front window glass of the automobile. antenna.   The glass antenna for a vehicle according to any one of claims 1 to 5, wherein the antenna for receiving the terrestrial digital radio broadcast wave is provided in the vicinity of the corner portion of the opening of the rear window glass of the automobile.   The glass antenna for a vehicle according to any one of claims 1 to 5, wherein the antenna for receiving the terrestrial digital radio broadcast wave is provided in an opening portion of a side window of an automobile.   The antenna pattern of the present invention is produced by printing a conductive material on a transparent resin film or sheet having an adhesive surface, or by sticking a wire wire or the like, and is attached to a window glass surface of an automobile. Item 11. The glass antenna for a vehicle according to any one of Items 1 to 10.

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