JP6094334B2 - Glass antenna for vehicles - Google Patents

Description

  The present invention relates to an antenna capable of suitably receiving radio waves of terrestrial digital radio broadcasting waves (DAB: Digital Audio Broadcasting), and relates to a glass antenna for a vehicle provided on a window glass of an automobile.

  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 almost everywhere in the world is the DAB standard, and band 3 which is the first frequency band of the DAB standard having a frequency band of 174 to 240 MHz. Two separate frequency bands, the band and the L band, which is the second frequency band of the DAB standard with a frequency band of 1452 to 1492 MHz, are used.

  Since the frequency band of the DAB standard band 3 is wide, the glass antenna for a vehicle that receives the radio wave needs to be able to receive the radio wave with high sensitivity evenly in a desired wide frequency band. As a glass antenna for a vehicle that can receive a wide-band radio wave, for example, as a vehicle antenna described in Japanese Patent Application Laid-Open No. 2005-2291140 (Patent Document 1) related to the application of the present applicant, the first feeding point is used. There has been proposed a glass antenna for a vehicle including a connected first element and a second element that is connected to the second element and forms a closed loop surrounding the first element.

  Alternatively, in Japanese Patent Application Laid-Open No. 2012-029032, which is also related to the application of the present applicant (Patent Document 2), a hot-side element connected to a hot-side feeding point and a distance from the hot-side feeding point are provided. A ground-side feed point, and a ground-side first element and a ground-side second element that extend in opposite directions from the ground-side feed point, and the ground-side first element and the ground-side second element include: The hot-side element is disposed so as to surround from the left and right, and the tip ends of the ground-side first element and the ground-side second element are close to each other, overlap, and capacitively coupled. A vehicle glass antenna is described.

JP 2005-229140 A JP 2012-029032 A

  In the glass antenna for a vehicle described in Patent Document 1, the second element has a closed loop structure. Therefore, when the glass antenna for a vehicle is applied to a window glass of an automobile having various shapes, in a desired band. Antenna tuning that adjusts the length and shape of each element for adjustment to obtain a desired antenna sensitivity has been difficult.

  Moreover, the glass antenna for vehicles described in patent document 2 makes each front-end | tip part of the said earth | ground side 1st element and the said earth | ground side 2nd element overlap, and adjusts the length and space | interval of each overlap part. Therefore, compared with the antenna described in Patent Document 1, when applied to the window glass of various shapes of automobiles, adjustment for obtaining a desired antenna sensitivity in a desired band is facilitated. . However, the optimum antenna pattern can be found by adjusting the overlap length of the tip of each of the ground side first element and the ground side second element and the length and arrangement of each element. Had a hard time.

  The present invention seeks to solve these problems. That is, DAB band 3 band radio waves can be suitably received over the entire band 3 band, the antenna shape is simple, and the desired antenna sensitivity in DAB band 3 band when applied to the window glass of various vehicles. It is an object of the present invention to provide a glass antenna for a vehicle that can be easily adjusted to obtain the above.

  The glass antenna for vehicles of this invention is a glass antenna for vehicles arrange | positioned at the window glass of a motor vehicle. The glass antenna for a vehicle according to the present invention is connected to the core-side feed point, a ground-side feed point provided apart from the core-side feed point, and the core-side feed point, and is away from the core-side feed point. A core-side element extending in the direction, and a loop-shaped filament connected to the ground-side feeding point. And the said loop-shaped filament is extended in the direction away from the said core wire side feeding point and the said earth side feeding point, is bent, and surrounds the said core wire side element, And the front-end | tip becomes an open end Yes.

  In the vehicle glass antenna of the present invention, when the tip of the loop-shaped filament is an open end as described above, when the vehicle glass antenna of the present invention is applied to various vehicles, in a desired band. It becomes easy to perform antenna tuning that adjusts the length of the loop-shaped filament or the shape so as to obtain a desired antenna sensitivity.

  Further, the glass antenna for a vehicle according to the present invention is such that, when the glass antenna for a vehicle is attached to a vehicle body, a part of the loop-shaped filament is close to an edge of a body flange of the vehicle body. The antenna may be disposed on the window glass.

  In the vehicle glass antenna of the present invention, a desired antenna sensitivity can be easily obtained in a desired band by capacitively coupling a part of the loop-shaped filaments close to the edge of the body flange of the vehicle body. Become.

  Furthermore, the glass antenna for vehicles of the present invention can fold the tip of the loop-shaped filament.

  The glass antenna for a vehicle of the present invention keeps the length of the loop-shaped filaments so that a desired antenna sensitivity can be obtained in a desired band by folding the tip of the loop-shaped filaments in this way. The area surrounded by the loop-like filaments can be reduced. Further, as in the glass antenna for a vehicle shown in FIG. 5, the looped filament and the end of the body flange are brought close to each other by bringing the end of the looped filament that is folded back on the upper edge of the vehicle body flange edge. Since the adjustment of the length and the interval close to the upper side of the edge becomes easy, the antenna tuning for obtaining the desired antenna sensitivity in the desired band of the vehicle glass antenna of the present invention becomes easier.

  Further, the glass antenna for a vehicle of the present invention is arranged such that an auxiliary element is connected or that the auxiliary element is capacitively coupled to the outside of the loop-shaped line in the vicinity of the loop-shaped line. Also good. By providing such an auxiliary element, the input impedance of the glass antenna for a vehicle of the present invention is adjusted, so that adjustment to desired antenna sensitivity is facilitated in a desired band.

  In the glass antenna for a vehicle of the present invention, the length of the loop-shaped filament may be 0.7αλ (α: wavelength reduction rate of the glass plate, λ: center frequency in a desired frequency band). A desired antenna sensitivity can be obtained in a desired band by setting the length of the loop-shaped filament around the length.

  The glass antenna for a vehicle according to the present invention has a desired antenna in a desired band when the glass antenna for a vehicle according to the present invention is applied to various vehicles because the tip of the loop-shaped filament is an open end. Antenna tuning that adjusts the length of the loop-shaped filament or the shape thereof can be easily performed so as to obtain sensitivity.

The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 1. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 2. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 3. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 4. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 5. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 6. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 7. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 8. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 9. FIG. The front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 10. FIG. The front view of the rear glass whole when it sees from the vehicle inside when the glass antenna for vehicles which concerns on Embodiment 10 is attached to the defogger upper margin part of rear glass. The figure which showed the measurement result of the antenna sensitivity in the band 3 of DAB when the glass antenna for vehicles concerning Embodiment 10 is attached to the defogger upper margin part of rear glass. The front view of the whole windshield when it sees from the vehicle inner side, when the glass-mounted antenna for vehicles which concerns on Embodiment 2 is attached to a windshield upper side. The front view of the whole side glass when seeing from the vehicle inner side, when the glass antenna for vehicles which concerns on Embodiment 1 is attached to a side glass.

  Hereinafter, the configuration of the antenna according to the embodiment of the present invention will be described. In the present specification, the terms “upper”, “lower”, “right”, and “left” are used for the attached drawings, and do not define the direction in the actual article.

<Embodiment 1>
FIG. 1 is a front view of an antenna according to Embodiment 1 of the present invention as viewed from the vehicle interior side.

  The glass antenna for a vehicle according to the first embodiment includes a core wire side feed point 11 and a ground side feed point 12, and the ground side feed point 12 is disposed separately below the core wire side feed point 11. Yes.

  One end of a horizontal line 131 constituting the core wire side element 13 is connected to the core wire side feed point 11 and is extended in a direction away from the core wire side feed point 11. In addition, one end of a loop-shaped wire 141 constituting the ground-side element 14 is connected to the ground-side feeding point 12, and the other end is arranged to surround the horizontal wire 131 in a rectangular shape so as to be an open end. It is installed.

  The glass antenna for a vehicle according to the first embodiment has a desired band when the glass antenna for a vehicle according to the present invention is applied to various vehicles because the tip of the loop-shaped filament 141 is an open end. Thus, it is easy to perform antenna tuning for adjusting the length of the loop-shaped filament 141 and adjusting the shape so that a desired antenna sensitivity can be obtained.

<Embodiment 2>
FIG. 2 is a front view of a glass antenna for a vehicle according to Embodiment 2 of the present invention as viewed from the inside of the vehicle. The glass antenna for a vehicle according to the first embodiment is such that the open end portion of the loop-shaped wire 141 forms a proximity portion 14a with the body flange, is close to the edge 2 of the body flange, and is capacitively coupled. Is different.

  The glass antenna for a vehicle according to the second embodiment can easily obtain a desired antenna sensitivity in a desired band by forming the proximity portion 14a with the body flange in this way.

<Embodiment 3>
FIG. 3 is a front view of a glass antenna for a vehicle according to Embodiment 3 of the present invention as viewed from the inside of the vehicle. In the glass antenna for a vehicle according to the second embodiment, the ground-side feeding point 12 is spaced apart from the core-side feeding point 11 and is connected to the ground-side feeding point 12 of the loop-shaped wire 141. The difference is that the end portion on the side forming the proximity portion 14a with the body flange is close to the end edge 2 of the body flange and capacitively coupled. Even with such a configuration, it is possible to easily obtain a desired antenna sensitivity in a desired band by forming the proximity portion 14a with the body flange.

<Embodiment 4>
FIG. 4 is a front view of a glass antenna for a vehicle according to Embodiment 4 of the present invention viewed from the inside of the vehicle. The glass antenna for a vehicle according to the second embodiment includes a point where the core-side feeding point 11 and the ground-side feeding point 12 are laterally spaced apart, and the core-side element 13 includes an L-shaped filament. The wire is connected at one end to the core wire-side feeding point 11 and is extended downward, and the wire is connected to the lower end of the vertical wire 132 and is extended to the right. 131 is different from the above. Even with such a configuration, the glass antenna for a vehicle of the present invention can easily obtain a desired antenna sensitivity in a desired band.

<Embodiment 5>
FIG. 5 is a front view of a glass antenna for a vehicle according to Embodiment 5 of the present invention as viewed from the inside of the vehicle. The glass antenna for a vehicle according to the second embodiment is such that a tip end portion of a loop-shaped filament 141 is folded upward, and a loop-shaped filament-folded portion 141a is formed. The front end portion of the folded portion 141a is adjacent to the edge 2 of the body flange to form a proximity portion 14a with the body flange, and is capacitively coupled.

  The glass antenna for a vehicle of the present invention keeps the length of the loop-shaped filaments so that a desired antenna sensitivity can be obtained in a desired band by folding the tip of the loop-shaped filament 141 in this way. The area surrounded by the loop-shaped filament 141 can be reduced. Further, the proximity portion 14a with the body flange is formed by bringing the tip end portion of the looped wire folding portion 141a close to the edge 2 of the body flange of the vehicle to form the proximity portion 14a with the body flange. Since adjustment and adjustment of the distance from the edge 2 of the body flange are facilitated, antenna tuning for obtaining desired antenna sensitivity in a desired band becomes easier.

<Embodiment 6>
FIG. 6 is a front view of a glass antenna for a vehicle according to Embodiment 6 of the present invention as viewed from the inside of the vehicle. The glass antenna for a vehicle according to the second embodiment is different from the glass antenna for a vehicle in that the core wire side element 13 has two horizontal filaments 131 and one end thereof is connected to the core wire side feeding point 11 and extends in the same direction. . The lengths of the two horizontal filaments may be the same length or different lengths so that a desired antenna sensitivity can be obtained in a desired band.

  Moreover, when the core wire side element 13 is comprised with a some filament, the positional relationship of each filament is the shape which connects the ends of the horizontal filament 131 and the vertical filament 132 like Embodiment 4, and implementation. It is not necessary to be constrained by a shape in which one end of each of the plurality of filaments is connected to the core wire-side feeding point as in the sixth aspect and extended in the same direction. For example, when a core wire side element is composed of two wires, one end of one wire is connected to the core wire feeding point 11 and one end of the other wire is connected to the core wire feeding point 11. You may make it connect to the middle part of the said wire connected to.

<Embodiment 7>
FIG. 7 is a front view of a glass antenna for a vehicle according to Embodiment 7 of the present invention as viewed from the inside of the vehicle. It differs from the glass antenna for vehicles of Embodiment 2 in that the loop-shaped filament 141 is not rectangular. The vehicle glass antenna of the present invention is not limited to the rectangular shape as described above, and the shape thereof is not limited as long as the core wire side element 13 is formed so as to be surrounded by the loop-shaped wire 141.

<Eighth embodiment>
FIG. 8: is the front view seen from the vehicle inner side of the glass antenna for vehicles concerning Embodiment 8 of this invention. The glass antenna for a vehicle according to the seventh embodiment is different from the glass antenna for a vehicle in that one end of an auxiliary wire 142 is connected to the looped wire 141 as an auxiliary element. By connecting the auxiliary wire 142 to the loop wire 141 in this way, the input impedance of the vehicle glass antenna of the present invention matches the characteristic impedance of the coaxial cable connected to the vehicle glass antenna of the present invention. Therefore, the auxiliary wire 142 can be used to obtain a desired antenna sensitivity in a desired band.

<Ninth Embodiment>
FIG. 9: is the front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 9 of this invention. In the glass antenna for a vehicle according to the eighth embodiment, the auxiliary element is the parasitic wire 15, the parasitic wire 15 is close to the loop-shaped wire 141, and the proximity part of the loop-shaped wire to the auxiliary element 14b is formed, and the loop-shaped wire 141 is different from the parasitic wire 15 in the proximity of the parasitic wire 15 and is capacitively coupled. Even if the auxiliary element is constituted by such a parasitic wire 15, it can be used for obtaining a desired antenna sensitivity in a desired band.

<Embodiment 10>
FIG. 10: is the front view seen from the vehicle inside of the glass antenna for vehicles concerning Embodiment 10 of this invention. The glass antenna for a vehicle according to the eighth embodiment includes an FM second antenna that constitutes the FM second antenna 3 in addition to the auxiliary filament 142 as a point where the tip of the loop-shaped filament 141 is folded back. The difference is that an antenna element 32 is used.

  The loop-shaped strip 141 is close to a part of the element 32 of the FM second antenna, and a proximity portion 14c with the FM second antenna is formed and capacitively coupled. Even if an element constituting such a glass antenna for a vehicle according to the present invention is used as an auxiliary element, it can be used for obtaining a desired antenna sensitivity in a desired band.

<Connection between Glass Antenna for Vehicle of the Present Invention and Receiver>
The vehicular glass antenna of the present invention uses a coaxial line as a feed line for transmitting a signal received by the vehicular glass antenna to a receiver. A feeding terminal (not shown) is connected to the tip of the coaxial line, and the feeding terminal is soldered to the core-side feeding point 11 and the ground-side feeding point 12 of the vehicle glass antenna of the present invention. The coaxial wire is connected to the core side of the power supply terminal, and the outer conductor of the coaxial line is connected to the ground side of the power supply terminal.

<About the formation method of the glass antenna for vehicles of this invention>
The glass antenna for a vehicle of the present invention can use the same general conductive ceramic paste as that for forming a rear glass defogger, and can be printed by the same method as the defogger and baked in a heating furnace.

  A blank portion sandwiched between the FM first antenna 4 and the FM second antenna 3 on the defogger 6 of the rear glass 5 as shown in FIG. Arranged. Furthermore, the dimensions and positional relationship of each component and the positional relationship with the FM second antenna 3 were adjusted so as to be suitable in a frequency band of 174 to 240 MHz, which is the frequency band of the 3 band of DAB. Then, the rear glass 5 was attached to the vehicle, and the antenna performance was measured in the frequency band of the DAB band 3 of the vehicle glass antenna of the tenth embodiment.

<Positional relationship of each antenna on the rear glass>
FIG. 11 is a view showing the rear glass 5 when viewed from the inside of the vehicle. The rear glass 5 is adjusted to receive the defogger 6, the FM first antenna 4, the FM second antenna 3, and the DAB band 3 band. The vehicle glass antenna 1 of the present invention was disposed.

  The defogger 6 is provided with a pair of bus bars 62 at both left and right ends of the rear glass 5 along the left and right sides, respectively, and a plurality of heating wires 61 are arranged in the horizontal direction between the pair of bus bars 62. The both ends of each heating wire 61 were connected to the bus bar 62. Further, along the center line d in the left-right direction of the rear glass 5, an orthogonal wire 63 is disposed from the uppermost heating wire 61 to the lowermost heating wire 61, and all heating that overlaps the orthogonal wire 63 is performed. The wire 61 was connected.

  The FM first antenna 4 was disposed on the upper portion of the defogger 6 of the rear glass 5. The FM first antenna 4 is provided with a feed point 41 of the FM first antenna at the right end of the rear glass 5 on the upper part of the defogger 6, and from the feed point 41 of the FM first antenna, an element 42 of the FM first antenna. And a blank portion is formed on the left side of the upper portion of the defogger 6 of the rear glass 5.

  The FM second antenna 3 was disposed in a blank portion where the element 42 of the FM first antenna on the left side of the rear glass 5 on the upper part of the defogger 6 was not disposed. The FM second antenna 3 is provided with an FM second antenna feeding point 31 on the right side of the rear glass 5 on the upper part of the defogger 6, and the FM second antenna element 32 is moved from the FM second antenna feeding point 31. Stretched.

  The filament constituting the element 32 of the FM second antenna has one end connected to the feeding point 31 of the FM second antenna, extended in the right direction of the rear glass 5, and folded in the middle to form a folded portion. . Further, the element 32 of the FM second antenna connects a single line so as to be parallel to the line from the feeding point 31 of the FM second antenna to the folded portion of the line, and a double line Configured.

  The glass antenna 1 for a vehicle according to the present invention is disposed so as to be positioned above the FM second antenna 3 in a blank portion where the element 42 of the FM first antenna on the left side above the defogger 6 of the rear glass 5 is not disposed. did.

  In the glass antenna 1 for a vehicle of the present invention, the core-side feeding point 11 and the ground-side feeding point 12 are disposed so as to be vertically separated along the left side portion of the rear glass 5. The core wire side feeding point 11 is disposed above the ground side feeding point 12.

  One end of the loop-shaped strip 141 of the ground side element 14 is connected to the ground side feed point 12, and the lower side of the strip extends to the right side of the rear glass 5, and the element 32 of the FM second antenna is connected to the loop side strip 141. A proximity portion 14c between the loop-shaped filament and the FM second antenna was formed in the vicinity of the folded portion of the constituting filament and capacitively coupled. Because of this configuration, the lower part of the loop-shaped filament 141 is horizontally extended to the right in order to be close to the folded portion of the filament constituting the element 32 of the FM second antenna at a certain interval. The structure is such that it is bent downward and then folded upward.

  Further, the auxiliary filament 142 of the ground side element has one end connected to a bending point that is folded upward at the lower portion of the loop-shaped filament 141, and horizontally extended to the right. Furthermore, the looped-wire-shaped folded portion 141a is disposed so as to be close to the edge 2 of the body flange when the rear glass 5 is attached to the vehicle.

<Dimensions of Glass Antenna for Vehicle of the Present Invention and FM Second Antenna, Distance Between Both Antennas>
The dimensions are described below using the reference numerals shown in FIG.

[Dimensions of Glass Antenna for Vehicle of the Present Invention]
Dimensions of core wire side feed point and ground side feed point = 10 mm × 10 mm
Interval 1k = 30mm between core wire side feed point 11 and ground side feed point
Length 1a = 110mm of horizontal wire 131 of core wire side element
Interval 1b = 15mm between horizontal filaments 131 of two core wire side elements
Total length of the loop-shaped filament 141 = 670 mm
The length of the 1c portion of the looped filament 141 = 175 mm
The length of the 1d portion of the looped filament 141 = 40 mm
The length of the 1e portion of the loop-shaped filament 141 = 45 mm
The length of the 1f portion of the looped filament 141 = 115 mm
Length of 1 g part of loop-shaped filament 141 = 220 mm
Overall length of the loop-shaped line-folded portion 141a = 75 mm
The length of the 1h portion of the loop-shaped line-folded portion 141a = 15 mm
The length of the 1i portion of the loop-shaped line-folded portion 141a = 60 mm
Auxiliary wire 142 of earth side element = 110mm
Proximal portion 14a = 60mm between the loop-shaped element and the edge of the body flange
Proximal portion 14c = 205mm between loop element and FM second antenna
The total length of the loop-shaped strip 141 is λ at the center frequency (207 MHz) of the DAB band 3 frequency band, and the wavelength reduction rate α of the glass provided with the glass antenna of the present invention is 0.7. Sometimes it can be expressed as about 0.7α.

[Dimension of FM second antenna]
FM second antenna 3a length = 170 mm
FM second antenna 3b length = 25mm
Length of part 3c of FM second antenna = 160 mm
The distance between the 3d portions of the FM second antenna = 10 mm.

[Gap between the vehicle glass antenna of the present invention, FM second antenna, and edge of body flange]
Spacing between looped filament and folded part a = 5 mm
Spacing b = 5 mm between the lower horizontal portion of the loop-shaped filament 141 and the folded portion of the FM second antenna
The distance c = 5 mm between the lower bent portion of the loop-shaped filament 141 and the folded portion of the FM second antenna
The distance d between the ground side feeding point 12 and the feeding point 31 of the FM second antenna is 20 mm.

<Method for forming each antenna>
The vehicle glass antenna 1, the FM second antenna 3, and the FM first antenna 4 of the present invention can use the same general conductive ceramic paste as that for forming the rear glass defogger, and the same method as the defogger. And printed in a furnace. Moreover, the width | variety of each filament which comprises all the antennas was 3 mm.

<How to connect each antenna to the receiver>
[Connection method between FM first antenna and FM second antenna and receiver]
The FM first antenna 4 is connected to an amplifier (not shown) installed on the vehicle body in the vicinity of the feeding point 41 of the FM first antenna by an AV line, and a coaxial line extended from a receiver is connected to the amplifier. . The outer side of the coaxial line was grounded to the vehicle body via an amplifier. The FM second antenna 3 is not connected to the amplifier. Therefore, the FM second antenna 3 is connected to a ground point (not shown) on a vehicle body near the feeding point 31 of the FM second antenna from a receiver (not shown) to a ground point with a coaxial cable (not shown). The outer sheath side was grounded, the core wire side of the coaxial cable was connected to an AV line (not shown), and the feed point 31 of the FM second antenna was connected.

[Method for Connecting Glass Antenna for Vehicle of the Present Invention to Receiver]
The glass antenna 1 for a vehicle according to the present invention uses a coaxial line as a feed line for transmitting a signal received by the antenna to a receiver. A power supply terminal (not shown) is connected to the end of the coaxial line, and the ground side of the power supply terminal is connected to the ground side power supply point 12, and the hot side power supply point 11 is connected to the hot side. The power supply terminal and each power supply point are connected by soldering. The coaxial wire is connected to the hot side of the power supply terminal, and the outer conductor of the coaxial line is connected to the ground side of the power supply terminal. Then, the other end of the coaxial line was connected to a receiver.

<Measurement result of glass antenna for vehicle of the present invention>
FIG. 12 shows the average value of the antenna sensitivity in all directions in the frequency band of 174 to 240 MHz, which is the band 3 band of DAB of the glass antenna for a vehicle of the present invention (hereinafter simply referred to as the antenna). I will call it sensitivity). The unit of the horizontal axis in FIG. 12 is frequency, and the unit is MHz. The vertical axis | shaft of FIG. 12 has shown the antenna sensitivity, and a scale is 10 dB.

  In FIG. 12, it can be seen that uniformly high antenna sensitivity is obtained in the frequency band of 174 to 240 MHz, which is the band 3 of DAB.

    The vehicle glass antenna 1 according to the second embodiment of the present invention shown in FIG. 13 is arranged on the upper right side of the windshield 7 as shown in FIG. Furthermore, the dimensions and positional relationship of each component were adjusted so as to be suitable in a frequency band of 174 to 240 MHz which is a frequency band of the 3 bands of DAB. Then, the windshield 7 was attached to the vehicle, and the antenna performance was measured in the frequency band of the DAB band 3 of the vehicle glass antenna of the second embodiment.

  The glass antenna 1 for a vehicle according to the present invention uses a coaxial line as a feed line for transmitting a signal received by the antenna to a receiver. A power supply terminal (not shown) is connected to the end of the coaxial line, and the ground side of the power supply terminal is connected to the ground side power supply point 12, and the hot side power supply point 11 is connected to the hot side. The power supply terminal and each power supply point are connected by soldering. The coaxial wire is connected to the hot side of the power supply terminal, and the outer conductor of the coaxial line is connected to the ground side of the power supply terminal. Then, the other end of the coaxial line was connected to a receiver. As a result of the measurement, it was found that the same high antenna sensitivity was obtained in the frequency band of 174 to 240 MHz that is the band 3 of DAB as in the case of Example 1.

    The vehicle glass antenna 1 according to the first embodiment of the present invention shown in FIG. 14 is disposed on the left side of the side glass 8 as shown in FIG. Furthermore, the dimensions and positional relationship of each component were adjusted so as to be suitable in a frequency band of 174 to 240 MHz which is a frequency band of the 3 bands of DAB. Then, the side glass 8 was attached to the vehicle, and the antenna performance was measured in the frequency band of the DAB band 3 of the vehicle glass antenna of the first embodiment.

  The glass antenna 1 for a vehicle according to the present invention uses a coaxial line as a feed line for transmitting a signal received by the antenna to a receiver. A power supply terminal (not shown) is connected to the end of the coaxial line, and the ground side of the power supply terminal is connected to the ground side power supply point 12, and the hot side power supply point 11 is connected to the hot side. The power supply terminal and each power supply point are connected by soldering. The coaxial wire is connected to the hot side of the power supply terminal, and the outer conductor of the coaxial line is connected to the ground side of the power supply terminal. Then, the other end of the coaxial line was connected to a receiver. As a result of the measurement, it was found that the same high antenna sensitivity was obtained in the frequency band of 174 to 240 MHz that is the band 3 of DAB as in the case of Example 1.

DESCRIPTION OF SYMBOLS 1 Glass antenna 11 for vehicles 11 Core side feed point 12 Ground side feed point 13 Core side element 131 Horizontal line 132 of core side element Vertical line 14 of core side element 14 Ground side element 14a Proximity part 14b with body flange Proximal part 14c Proximity part 141 with FM second antenna Loop-shaped line 141a Loop-shaped line-folding part 142 Auxiliary line 15 for ground side element Parasitic element 2 Edge 3 of body flange FM 2nd antenna 31 FM Second antenna feed point 32 FM second antenna element 4 FM first antenna 41 FM first antenna feed point 42 FM first antenna element 5 Rear glass 6 Defogger 61 Heating wire 62 Bus bar 63 Orthogonal wire 7 Windshield 8 Side glass

Claims (4)

A vehicle glass antenna disposed on a window glass of an automobile,
A core wire side feeding point (11);
An earth-side feeding point (12) provided separately from the core-side feeding point (11);
A core wire side element (13) connected to the core wire side feed point (11) and extending in a direction away from the core wire side feed point (11);
A loop-shaped filament (141) connected to the ground-side feeding point (12),
The loop-shaped filament (141) is extended and bent in a direction away from the core-side feeding point (11) and the ground-side feeding point (12), thereby enclosing the core-side element (13), Its tip is an open end ,
An open end of the loop-shaped filament (141) forms a proximity portion (14a) with a body flange, is close to an end edge (2) of the body flange, and is capacitively coupled . Glass antenna.   The vehicular glass antenna according to claim 1, wherein when the vehicular glass antenna is attached to a vehicle body, the loop-shaped filament (141) is close to an end edge (2) of a body flange of the vehicle body. Glass antenna.   The glass antenna for a vehicle according to claim 1 or 2, wherein a tip end portion of the loop-shaped filament (141) is folded back.   An auxiliary element (142) is connected to the loop-shaped filament (141), or the auxiliary element (15, 32) is placed outside the loop-shaped filament (141). The glass antenna for a vehicle according to any one of claims 1 to 3, wherein

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