WO2015111300A1 - Glass antenna - Google Patents

Abstract

This glass antenna to be disposed on a vehicle window glass is characterized in that: the glass antenna is provided with a first antenna that has a first power supply section, a first element connected to the first power supply section, and a second element connected to the first power supply section; the second element has a main body section extending from the first power supply section, and a folded back section connected to the main body section; and the folded back section is folded back from an end portion of the main body section, and is disposed along the main body section.

Description

Glass antenna

The present invention relates to a glass antenna disposed on the surface of a glass plate, and more particularly to an antenna that receives broadcast waves of a plurality of frequencies.

In countries around the world, radio and television broadcast frequencies and frequencies used for remote keyless entry differ depending on the country and region, so it was necessary to develop antennas with different element lengths for each destination. However, in order to develop many types of antennas, a large number of work steps are required, and thus antennas corresponding to a plurality of bands are desired. For example, the frequency of FM radio broadcasting is 76-90 MHz in Japan and 88-108 MHz in many foreign countries. If good sensitivity cannot be obtained in multiple bands, the element length is adjusted for each destination. There is a need to.

Also, DAB (digital audio broadcasting) is becoming common in Europe. Depending on the destination, only FM and AM radio broadcast bands are covered, and FM and AM radio broadcast bands and DAB bands are covered. There is. Therefore, by supporting a plurality of bands with one antenna, the types of antennas to be developed can be reduced, and the development man-hours can be reduced.

As an antenna for obtaining good sensitivity at such a plurality of frequencies, Patent Document 1 describes an antenna that can satisfactorily receive two DAB bands (band 3: 174 to 245 MHz, L band: 1452 to 1492 MHz). Has been.

Patent Document 2 describes a typical dual-frequency switching antenna. Since the antenna described in Patent Document 2 receives two radio waves in the 800 MHz band and the 1500 MHz band, the antenna has two elements having a length suitable for each frequency, and the two elements are divided into two or V-shaped. Connected in a shape.

JP 2010-81567 A JP-A-6-291530

However, the antenna described in Patent Document 1 cannot receive FM radio broadcast and DAB broadcast well. Also, with the antenna described in Patent Document 2, it is difficult to obtain good sensitivity in two broad bands such as the FM radio broadcast band and DAB band 3.

An object of the present invention is to provide an antenna that can satisfactorily receive both the FM radio broadcast band and the DAB band.

That is, this invention is a glass antenna arrange | positioned at the window glass for vehicles, Comprising: The 1st electric power feeding part connected to a receiver, The 1st element connected to the said 1st electric power feeding part, The said 1st electric power feeding part A first antenna having a second element connected to the first element, the second element having a main body extending from the first power feeding portion, and a folded portion connected to the main body. The folded portion is a glass antenna that is folded from an end portion of the main body portion and disposed along the main body portion.

Further, the present invention is the glass antenna further characterized in that the folded portion is folded from an end portion of the main body portion and arranged close to the main body portion.

The glass antenna is an antenna for receiving a first frequency band having a center frequency wavelength of λ ₁ and a second frequency band having a center frequency wavelength of λ _2. There, the shortening coefficient of wavelength of the window glass as alpha, the length of the folded portion is substantially αλ _2/4, the length of the body portion is substantially αλ _1/5, the length of the first element is a glass antenna, which is a substantially αλ _1/6.

Further, the present invention is the glass antenna further characterized in that the main body portions of the first element and the second element are extended in the same direction.

In the present invention, it is preferable that the first antenna is extended from the first feeding portion in a direction different from a direction in which the first element extends and a main body portion of the second element extends. It is a glass antenna characterized by having three elements.

Further, the present invention is the glass antenna, wherein the first antenna further includes at least one of an auxiliary element extending from the first power feeding portion and an auxiliary element extending from the first element. is there.

Further, the present invention is the glass antenna characterized in that at least one of the auxiliary elements is close to the outermost heating filament of the defogger arranged on the window glass and capacitively coupled.

Further, the present invention is the glass antenna further characterized in that the first antenna is close to a linear conductor disposed on the window glass and capacitively coupled.

Further, the present invention is the glass antenna, wherein the linear conductor is a second antenna.

Furthermore, in the present invention, the second antenna further includes a plurality of horizontal wires, at least one vertical wire connecting the plurality of horizontal wires, and a second power feeding unit, and a third frequency. The glass antenna is an antenna for receiving a band.

Further, the present invention is a glass antenna characterized in that a plurality of the vertical filaments are provided.

Further, the present invention is the glass antenna characterized in that at least one of the plurality of horizontal filaments is close to the second element and capacitively coupled.

Further, the present invention is the glass antenna further characterized in that at least one of the plurality of horizontal filaments is disposed between the first element and the second element.

Further, the present invention is the glass antenna further characterized in that at least one of the plurality of horizontal filaments has a folded portion whose end is folded upward or downward.

Further, according to the present invention, the second power feeding unit is provided at one end of the plurality of horizontal filaments, and the second antenna is connected to the uppermost filament of the plurality of horizontal filaments. It has a capacitive coupling line that is extended and disposed at a position where it is capacitively coupled to the body flange, and an auxiliary linear line that extends in a direction opposite to the direction in which the horizontal line extends from the second feeding portion. It is a glass antenna.

Further, the present invention is the glass antenna characterized in that the glass antenna further includes a third antenna, and the first antenna and the third antenna constitute a diversity antenna.

Further, in the present invention, the third antenna uses a line of a defogger arranged on the window glass as an antenna, and the defogger is provided with a third feeding unit connected to a receiver. It is a glass antenna characterized by this.

Further, according to the present invention, the defogger further includes a pair of bus bars provided on the left and right of the window glass, and a plurality of heating wires connecting the two bus bars, and the third antenna is A horizontal filament used in combination with the plurality of heating filaments, and at least two parallel auxiliary filaments extending from the bus bar or the outermost horizontal filament and having end portions spaced apart from each other. The two parallel auxiliary filaments are disposed close to each other along the glass antenna.

Further, the present invention is the glass antenna further characterized in that the third antenna has at least one auxiliary filament.

Further, the present invention is the glass antenna further characterized in that the third antenna has at least one vertical line connecting a plurality of horizontal lines of the third antenna.

Further, the present invention is a glass antenna further comprising a horizontal auxiliary line extending along the horizontal line from an end of at least one of the vertical lines.

According to the representative embodiment of the present invention, good sensitivity can be obtained in both the FM radio broadcast band and the DAB broadcast band.

The front view of the antenna pattern of 1st Example of this invention The front view of the antenna pattern of 2nd Example of this invention The front view of the antenna pattern of 3rd Example of this invention The front view of the antenna pattern of 4th Example of this invention The front view of the antenna pattern of 5th Example of this invention Front view of the antenna pattern of the sixth embodiment of the present invention The front view of the antenna pattern of 7th Example of this invention The front view of the antenna pattern of 8th Example of this invention The front view of the antenna pattern of 9th Example of this invention The front view of the antenna pattern of 10th Example of this invention The front view of the antenna pattern of 11th Example of this invention The front view of the antenna pattern of 12th Example of this invention The front view of the antenna pattern of 13th Example of this invention The front view of the antenna pattern of 14th Example of this invention The front view of the antenna pattern of 15th Example of this invention The front view of the antenna pattern of 16th Example of this invention. The front view of the antenna pattern of 17th Example of this invention The front view of the antenna pattern of 18th Example of this invention. The front view of the antenna pattern of 19th Example of this invention The front view of the antenna pattern of 20th Example of this invention The front view of the antenna pattern of 21st Example of this invention Frequency characteristics diagram of antenna of the 21st embodiment of the present invention Frequency characteristics diagram of antenna of the 21st embodiment of the present invention Frequency characteristics diagram of antenna of the 21st embodiment of the present invention

1 to 20 are views of the glass antenna according to the embodiment of the present invention as viewed from the inside of the vehicle.

As shown in FIG. 1, the glass antenna according to the embodiment of the present invention is provided on a rear glass of an automobile, and is connected to a first power feeding unit 15 and a first power feeding unit 15 and extends in a substantially horizontal direction. And a second element connected to the first power supply unit 15 and extending in the direction opposite to the extending direction of the first element 11. The second element extends from the first power feeding portion 15 and the folded portion 22 that is folded at the end of the main body portion 21 and extends in the direction of approaching the first power feeding portion 15 along the main body portion 21. It is comprised by. The folded portion 22 is disposed substantially parallel to the main body portion 21 in the vicinity thereof.

The first power supply unit 15 is connected to a reception amplifier 6 by a connection line (for example, AV electric wire) 5, and the reception amplifier 6 is connected to a receiver (not shown) by a high-frequency cable (for example, a coaxial cable). The receiving amplifier 6 is connected to the ground (vehicle body).

In the example shown in FIG. 1, the folded portion 22 extends from the end portion of the main body portion 21, but the folded portion 22 may extend from a position (in the middle) that is not the end portion of the main body portion 21.

Further, as shown in FIG. 2, the first element 11 and the second element may be stretched in the same direction.

Further, as shown in FIG. 3, a third element 31 extending from the first power feeding unit 15 may be provided. The third element 31 may be extended in a direction different from the extending direction of the first element 11 and the extending direction of the second element.

Further, as shown in FIGS. 4 and 5, auxiliary elements 12 and 13 that extend from the first element 11 along the first element 11 (for example, in parallel) may be provided. The number of auxiliary elements may be one as shown in FIG. 4, two as shown in FIG. 5, or a plurality of more than two. The auxiliary element may be provided above or below the first element 11. For example, one auxiliary element may be provided above the first element 11. The auxiliary elements 12 and 13 may be extended from the first power feeding unit 15, extended from the first element 11, or other auxiliary elements may be extended from a certain auxiliary element.

The first antenna 10 is configured as described above. The element of the first antenna 10 is adjusted to a length suitable for receiving FM radio broadcast band (76 to 108 MHz) and DAB (Digital Audio Broadcast) band 3 (174 to 245 MHz).

As shown in FIGS. 5 and 6, the auxiliary element 12 may be disposed close to the defogger 90 and capacitively coupled to the outermost heating filament 91 of the defogger 90. 5 and 6, the right half of the defogger 90 is not shown.

Note that the element of the first antenna may be disposed close to a conductor (for example, another antenna) that is not connected to the ground instead of the defogger 90 and may be capacitively coupled. That is, the conductor adjacent to the element of the first antenna is shown in FIGS. 7 and 8 even in the heating filament 91 of the defogger 90 as shown in FIGS. 5 and 6, or in the parasitic element 40 as shown in FIG. Thus, the second antenna 50 may be used. Each filament is arranged in the second antenna 50 so as to obtain a reception effective area for suitably receiving the AM radio frequency band (526.5 to 1606.5 kHz). Furthermore, the element of the 1st antenna with which the conductor which is not connected to earth | ground is adjoining may be any of the 1st element 11, the auxiliary elements 12, 13, and the 2nd element (21, 22).

Also, as shown in FIGS. 9 and 10, a folded portion 56 may be provided at the end of the horizontal filament 52D. Further, as shown in FIG. 9, the folded portion 56 may be folded downward, or may be folded upward as shown in FIG.

Further, as shown in FIG. 11, the folded portion 56 may extend from the end of the uppermost horizontal filament 52F, be folded upward, and extend along the horizontal filament 52F (for example, in parallel). . The folded portion 56 is disposed close to the body flange 2 of the vehicle body to which the rear glass 1 is attached, and is capacitively coupled to the body flange 2.

Further, as shown in FIG. 12, the two folded portions 56 and 57 may be capacitively coupled to the body flange 2.

Further, as shown in FIG. 13, an auxiliary filament 58 extending outward from the second power feeding portion 54 (a direction opposite to the direction in which the horizontal filament 52 extends) may be provided. As shown in FIG. 13, the auxiliary filament 58 may be bent downward and may be extended downward (along the third element 31), or may be extended linearly outward.

Further, as shown in FIG. 14, the third antenna 60 may be provided on the rear glass 1 at a position away from the first antenna 10 (for example, under the defogger 90). The third antenna 60 includes two horizontal elements 61 and 62 and a third power feeding unit 63, and has a length suitable for receiving the FM radio broadcast band (76 to 108 MHz) and the TV broadcast band (470 to 770 MHz). It will be adjusted. In this case, the first antenna 10 and the third antenna 60 may constitute a diversity antenna, and FM radio broadcast may be received with diversity.

The defogger 90 has a pair of bus bars 93 provided on the left and right sides of the rear glass 1 and a plurality of heating wires 91 connecting the two bus bars 93. Moreover, you may have the vertical filament 92 which connects the some heating filament 91. FIG. The number of vertical filaments 92 may be one or more.

Further, as shown in FIG. 15, a defogger 90 may be used as the third antenna 60. The heating filament 91 and the vertical filament 92 constituting the defogger 90 function as a horizontal filament and a vertical filament in the third antenna 60, respectively.

In this case, one bus bar 93 of the defogger 90 is connected to the power source via the defogger coil 94, and the other bus bar 93 is connected to the ground via the defogger coil 94, and flows into the third antenna 60 from the power source and ground. Suppresses noise in the reception frequency band. In addition, a third power feeding unit 95 is provided in one bus bar 93. Also in this case, the first antenna 10 and the third antenna 60 constitute a diversity antenna.

Also, as shown in FIG. 16, the third antenna 60 has a plurality of parallel auxiliary filaments 96, 97, 98 extending downward from the lowest horizontal filament 91 and arranged along the horizontal filament 91. The ends of the parallel auxiliary filaments 96, 97, and 98 are located away from each other. Further, a part of the parallel auxiliary line 96 and a part of the parallel auxiliary line 97 are arranged in close proximity to each other so as to be along each other. Furthermore, a part of the parallel auxiliary line 97 and a part of the parallel auxiliary line 98 are arranged in close proximity to each other so as to be along each other. In addition, you may arrange | position so that not only a part of parallel auxiliary filament but almost all may mutually follow.

Further, the number of auxiliary filaments extending along the horizontal filament 91 may be three as shown in FIG. 16, two or four or more as shown in FIG. Furthermore, the auxiliary filament extending along the horizontal filament 91 may be extended downward from the horizontal filament 91 as shown in FIG. 16, or may be extended downward from the bus bar 93 as shown in FIG. In addition, even in the case shown in FIG. 17, a part of the parallel auxiliary filament 96 and at least a part of the parallel auxiliary filament 98 are arranged in close proximity to each other so as to be along each other.

Further, as shown in FIG. 18, an auxiliary filament 89 extending upward from the bus bar 93 (or the outermost horizontal filament 91) may be provided. Further, the fourth antenna 70 may be provided in the vicinity of the auxiliary filament 89. The fourth antenna 70 includes a fourth power feeding unit 71 and a horizontal element 72, and is adjusted to a length suitable for receiving a TV broadcast band (470 to 770 MHz). In this case, a diversity antenna may be configured by the third antenna 60 and the fourth antenna 70 to receive the TV broadcast diversity.

Further, as shown in FIG. 19, a plurality of vertical filaments 92 may connect the heating filament 91 of the defogger 90. In addition, the number of the vertical filaments 92 may be one, two, or four or more in addition to the three illustrated.

Further, as shown in FIG. 20, horizontal auxiliary filaments 99 that extend downward from the lowest horizontal filament 91 and extend from the center of the defogger to the left and right sides along the horizontal filament 91 may be provided.

In the antenna according to the embodiment of the present invention, the pattern is printed at a predetermined position on the indoor side of the window glass plate with a conductive ceramic paste at a width of about 0.7 mm, dried, and then baked in a heating furnace. Formed. Alternatively, an antenna may be formed using a conductive pattern formed on a resin film that transmits light, and attached to a glass plate.

As described above, the embodiment in which the antenna is provided on the rear glass 1 of the automobile has been described with respect to the embodiment of the present invention. However, the antenna according to the embodiment of the present invention may be provided in another place (for example, the windshield and the side glass).

Next, the operation of the glass antenna according to the embodiment of the present invention will be described.

Since the antenna of this embodiment is provided with the first element 11, the main body portion 21 of the second element, and the folded portion 22 of the second element, good sensitivity can be obtained in a plurality of frequency bands. In particular, the length of the folded portion 22 and substantially αλ _2/4, the length of the body portion 21 and substantially αλ _1/5, since the length of the first element 11 has a substantially αλ _1/6, the lower frequency Good sensitivity can be obtained both in the FM radio broadcast band (wavelength of central frequency = λ ₁ ) and the DAB broadcast band (wavelength of central frequency = λ ₂ ). Good sensitivity can also be obtained in the DAB L band (1452 to 1492 MHz).

The folded portion 22 is folded from the end portion of the main body portion 21 and is disposed close to the main body portion 21 so that the folded portion 22 is electrically strongly coupled to each other and has a low frequency FM radio broadcast band and a DAB broadcast band. In any case, good sensitivity can be obtained.

Further, since two different length elements (first element 11 and second element main body 21) for FM radio broadcast reception are provided, the sensitivity can be improved in a wide band in the FM radio broadcast band. Furthermore, by forming the folded portion 22 by folding the second element, the sensitivity can be improved even in the high frequency DAB band 3.

Further, by extending the first element 11 and the main body portion 21 of the second element in the same direction, the first element 11 and the second element (21, 22) are arranged on one side of the first power feeding portion 15, The antenna can be reduced in size. For this reason, the 1st electric power feeding part 15 can be arrange | positioned in the position close | similar to the side of the glass plate 1. FIG.

Further, a third element 31 extending from the first power feeding unit 15 is provided in a direction different from the direction in which the first element 11 extends and the direction in which the main body portion 21 of the second element extends, The sensitivity on the high frequency side of the FM radio broadcast band can be improved by adjusting the length and the relative positional relationship. Also, the sensitivity of DAB band 3 can be improved overall.

Further, since the auxiliary elements 12 extending from the first power feeding section 15 (FIG. 4) and the auxiliary elements 12 and 13 extending from the first element 11 (FIG. 5) are provided, the sensitivity of the high frequency DAB band 3 is increased. Can be improved.

Further, since the auxiliary element 12 is close to the heating wire 91 of the defogger 90 and the first antenna 10 is capacitively coupled to the defogger 90, the broadcast wave received by the heating wire 91 of the defogger 90 is guided to the first antenna 10. And the sensitivity of the first antenna 10 can be improved. In particular, the sensitivity of the high frequency DAB band 3 can be improved.

In addition, since the first antenna 10 (auxiliary element 12, second element) is close to the linear conductors 91, 42, 52 and the first antenna 10 is capacitively coupled to the conductors 91, 42, 52, the conductors 91, 42 are provided. , 52 can guide the broadcast wave received by the first antenna 10 and improve the sensitivity of the antenna. Moreover, the sensitivity in the FM radio broadcast band of a low frequency can be improved by adjusting the length and relative positional relationship of the elements on the conductors 91, 42, and 52 side.

In addition, since the second element (21, 22) is close to the horizontal filament 52 and the first antenna 10 is capacitively coupled to the second antenna 50, the broadcast wave received by the second antenna 50 is guided to the first antenna 10. And the sensitivity of the first antenna 10 can be improved. Further, by adjusting the length and relative positional relationship of the elements 52 and 53 of the second antenna 50, the sensitivity in the FM radio broadcast band can be improved.

Further, since the second antenna 50 includes a plurality of horizontal filaments 52, a vertical filament 53 connecting the horizontal filaments 52, and a second power feeding unit 54, the second antenna 50 can be used for other frequencies with a simple structure (for example, An AM radio broadcast receiving antenna can be configured.

Further, by providing a plurality of vertical filaments 53 and adjusting the interval between the vertical filaments 53, the sensitivity in the FM radio broadcast band can be easily improved.

Further, the first antenna 10 and the second antenna 50 can be capacitively coupled by arranging the second elements (21, 22) close to the horizontal filament 52.

Moreover, since the horizontal filament 52 is arrange | positioned between the 1st element 11 and the 2nd element (21, 22), the coupling | bonding of the 1st antenna 10 and the 2nd antenna 50 becomes strong, and the 1st antenna 10 and the 1st antenna The two antennas 50 are easily affected by each other. For this reason, the first antenna 10 becomes sensitive to changes in characteristics due to adjustment of the element length of the second antenna 50 and the relative positional relationship of the elements, and the characteristics of the first antenna 10 can be easily improved.

Further, since the folded portions 56 and 57 that are folded upward or downward are provided, the sensitivity of the first antenna 10 can be adjusted without greatly changing the characteristics of the second antenna 50. Further, by forming the folded portions 56 and 57 by folding upward from the horizontal filament 52, it is possible to improve the sensitivity of the first antenna 10 in the FM radio broadcast band (particularly, the middle band).

Further, since the folded portions 56 and 57 are capacitively coupled to the body flange 2 (FIGS. 11 to 15), the FM radio broadcast band (particularly, by adjusting the length of the folded portions 56 and 57 and the distance from the body flange) ), The sensitivity of the first antenna 10 in the middle region can be improved.

Moreover, since the auxiliary filament 58 extending in the direction opposite to the direction in which the horizontal filament 52 extends from the second feeding portion 54 is provided, the length of the auxiliary filament 58 and the extending direction of the second antenna 50 can be adjusted. The characteristics can be changed, and the sensitivity of the first antenna 10 in the FM radio broadcast band (especially in the middle range) can be improved.

In addition, since the third antenna 60 is disposed at a position away from the first antenna 10 and diversity reception is performed by the first antenna 10 and the third antenna 60, it becomes easier to receive incoming waves and improve reception performance. Can do.

Further, since the third antenna 60 is constituted by the filaments 91 and 92 of the defogger 90, it is not necessary to provide a separate antenna element, and deterioration of the appearance can be suppressed. Moreover, since the 3rd electric power feeding part 95 is provided in the bus bar 93, the electric power feeding part of a high frequency signal and the electric power feeding part of a heating wire can be shared. Further, since the bus bar 93 is connected to the power source and the ground via the defogger coil 94, the bus bar 93 can be connected to the power source and the ground for direct current and can be floated from the power source and the ground for high frequency.

In addition, a horizontal line (heating line) 91 and parallel auxiliary lines 96, 97, 98 extending from the bus bar 93 or the outermost horizontal line 91 are provided, and ends of the parallel auxiliary lines 96, 97, 98 are Two of the parallel auxiliary filaments 96, 97, and 98 that are spaced apart from each other are arranged close to each other, so that the third and third of the parallel auxiliary filaments can be adjusted by adjusting the width and length of the overlap of the parallel auxiliary filaments. The sensitivity of the antenna 60 can be improved, and the sensitivity of other antennas constituting the diversity can be improved.

Moreover, since the parallel auxiliary filaments 96, 97, and 98 are extended from the bus bar 93, the adjustment range can be increased by increasing the length of the parallel auxiliary filaments and increasing the length of overlap of the parallel auxiliary filaments. it can.

Further, since the auxiliary wire 89 is provided on the third antenna 60, the sensitivity of the third antenna 60 can be improved, and the sensitivity of the antenna provided around the third antenna 60 can be improved.

Moreover, since the vertical line 92 for connecting the horizontal line 91 is provided, the sensitivity of the third antenna 60 can be improved.

Further, a horizontal auxiliary line 99 extending from the end of the vertical line 92 along the horizontal line 91 is provided, and the end of the horizontal auxiliary line 99 is not connected to the defogger 90, so that the antenna characteristics can be freely adjusted. The degree can be increased.

Hereinafter, various embodiments of the present invention will be described.

<Example 1>
FIG. 1 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern of a first embodiment of the present invention.

The glass antenna of the first embodiment is constituted by the first antenna 10. The first antenna 10 is connected to the first power feeding unit 15 and the first power feeding unit 15, connected to the first element 11 extending in a substantially horizontal direction (left direction in the drawing), and the first power feeding unit 15, and It has the 2nd element extended | stretched in the reverse direction (the right direction in a figure) of the extending | stretching direction of 1 element.

The second element is folded back downward (or upward) at the end of the main body portion 21 from the main body portion 21 extending from the first power feeding portion 15, and is substantially parallel to the first portion along the main body portion 21. It is comprised by the folding | turning part 22 extended | stretched in the direction approaching the electric power feeding part 15. FIG. Note that the folded portion 22 may extend from the middle of the main body portion 21.

By making the length of each element of the first embodiment the same as that of the element of the second embodiment, which will be described later, an antenna suitable for receiving the FM radio broadcast band and DAB band 3 can be realized. it can.

Although illustration is omitted, the antenna of the first embodiment may be provided with a third element extending from the first feeding portion 15. The 3rd element is good to extend in the direction (for example, downward direction) different from the extending direction of the 1st element 11, and the extending direction of the 2nd element.

<Example 2>
FIG. 2 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern according to a second embodiment of the present invention.

The glass antenna of the second embodiment is different from the first embodiment in the extending direction of the first element 11.

The glass antenna of the second embodiment is constituted by the first antenna 10. The first antenna 10 is connected to the first feeding unit 15 and the first feeding unit 15, connected to the first element 11 extending in a substantially horizontal direction (right direction in the drawing), and the first feeding unit 15, and The second element extends in substantially the same direction as the first element 11 in the same direction as the extending direction of the first element 11 (right direction in the drawing).

The second element is folded back downward (or upward) at the end of the main body portion 21 from the main body portion 21 extending from the first power feeding portion 15, and is substantially parallel to the first portion along the main body portion 21. It is comprised by the folding | turning part 22 extended | stretched in the direction approaching the electric power feeding part 15. FIG. Note that the folded portion 22 may extend from the middle of the main body portion 21.

The length of each element of the first antenna 10 of the second embodiment is adjusted to a length suitable for receiving the FM radio broadcast band and the DAB band 3, and extends from the first power feeding unit 15. The length of the vertical portion of one element 11 is 20 mm, the length of the horizontal portion extending from the end of the vertical portion of the first element 11 is 400 mm, the length of the main body portion 21 of the second element is 460 mm, The length of the folded portion 22 is 300 mm, and the distance between the main body portion 21 and the folded portion 22 is 7 mm.

That is, the wavelength shortening ratio α is 0.7 rear window 1, when the FM radio broadcast band of the center frequency (wavelength = lambda ₁₎ to 92 MHz, the length of the first element 11 is substantially αλ _1/6, and the body the length of section 21 is substantially αλ _1/5. Further, when the center frequency of the DAB band 3 (wavelength = lambda _2), and 210 MHz, the length of the folded portion 22 is substantially αλ _2/4.

At this time, the length of the first element 11 may be only the length of the horizontal portion, and may include the length of the vertical portion in addition to the length of the horizontal portion.

In the first and second embodiments, in order to receive an FM radio broadcast band of a low frequency, two elements having different lengths of the main body portion 21 of the first element 11 and the second element are provided. Sensitivity can be improved in a wide frequency FM radio broadcast band. Further, the second element is folded to form the folded portion 22 and is disposed close to the main body portion 21 (in parallel with an interval of 7 mm), so that the sensitivity of the FM radio broadcast band of the low frequency is high without deteriorating. The sensitivity of frequency DAB band 3 can be improved.

In the second embodiment, the first element 11 and the second element (21, 22) are connected to the first power supply section 15 by extending the first element 11 and the main body section 21 of the second element in the same direction. The antenna can be reduced in size by being arranged on one side of the antenna. For this reason, the 1st electric power feeding part 15 can be arrange | positioned in the position close | similar to the side of the glass plate 1. FIG.

<Example 3>
FIG. 3 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a third embodiment of the present invention.

The glass antenna of the third embodiment is different from the second embodiment in that a third element 31 is provided.

The glass antenna of the third embodiment is constituted by the first antenna 10. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, and a third element 31. The second element includes a main body portion 21 and a folded portion 22.

The third element 31 extends from the first power feeding unit 15 in a direction different from the extending direction of the first element 11 and the extending direction of the second element. Specifically, the third element 31 includes a horizontal portion extending from the first power feeding portion 15 in a direction opposite to the extending direction of the main body portion 21 of the second element (left direction in the drawing), and a lower portion from the end of the horizontal portion. And a vertical portion extending in a direction (a direction different from the right direction in which the first element 11 and the second element extend). The length of the horizontal portion of the third element 31 is 5 mm, and the length of the vertical portion is 150 mm. In FIG. 3, there is one third element 31, but a plurality of third elements 31 may be provided.

Since the configuration of the third embodiment other than that described above is the same as that of the second embodiment, the same reference numerals are given and description thereof is omitted.

In the third embodiment, since the third element 31 extending from the first power feeding unit 15 is provided, by adjusting the length and relative positional relationship of the third element 31, the sensitivity on the high frequency side of the FM radio broadcast band Can be improved. Also, the sensitivity of DAB band 3 can be improved overall.

<Example 4>
FIG. 4 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern according to a fourth embodiment of the present invention.

The glass antenna of the fourth embodiment is different from the third embodiment in that an auxiliary element 12 is provided.

The glass antenna of the fourth embodiment is constituted by the first antenna 10. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and an auxiliary element 12. The second element includes a main body portion 21 and a folded portion 22.

The auxiliary element 12 extends downward from the first power feeding unit, and is then arranged substantially in parallel along the first element 11. The length of the auxiliary element 12 is preferably shorter than the first element 11 or about the same length. Specifically, the length of the vertical portion of the auxiliary element 12 is 33 mm, and the length of the horizontal portion is 125 mm. The auxiliary element 12 may extend from the first power feeding unit 15 or may extend from the first element 11.

Since the configuration of the fourth embodiment other than that described above is the same as that of the third embodiment, the same reference numerals are given and description thereof is omitted.

In the fourth embodiment, since the auxiliary element 12 extending from the first feeding unit 15 is provided, the sensitivity of the high frequency DAB band 3 can be improved.

<Example 5>
FIG. 5 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern according to a fifth embodiment of the present invention.

The glass antenna of the fifth embodiment is different from the third embodiment in that auxiliary elements 12 and 13 are provided.

The glass antenna of the fifth embodiment is constituted by the first antenna 10. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22.

The auxiliary element 12 extends downward from the intersection of the vertical portion and the horizontal portion of the first element, and is then arranged substantially in parallel along the first element 11. The length of the auxiliary element 12 may be shorter than the first element or about the same length as the first element 11. Specifically, the length of the vertical portion of the auxiliary element 12 is 33 mm, and the length of the horizontal portion is 125 mm.

The auxiliary element 13 extends rightward from the vertical portion of the first element and is arranged substantially in parallel along the first element 11. The length of the auxiliary element 13 is preferably shorter than the first element 11 or about the same length. Specifically, the auxiliary element 13 has a length of 175 mm.

The auxiliary elements 12 and 13 may be extended from the first element 11 or may be extended from the first power feeding unit 15.

Since the configuration of the fifth embodiment other than that described above is the same as that of the third embodiment, the same reference numerals are given and description thereof is omitted.

In the fourth embodiment, the auxiliary element 12 is provided below the first element 11. In the fifth embodiment, the auxiliary element 12 is provided below the first element 11, and the auxiliary element 13 is provided above the first element 11. Thus, the number of auxiliary elements is not limited to that illustrated. Further, the auxiliary element may be provided on the upper side or the lower side of the first element 11. For example, in the fifth embodiment, only the auxiliary element 13 may be provided on the upper side of the first element 11.

Further, when a plurality of auxiliary elements are provided, another auxiliary element may be extended from one auxiliary element.

In the fifth embodiment, the auxiliary element 12 is disposed close to the defogger 90 (for example, 5 mm apart in parallel) so as to be capacitively coupled to the uppermost heating wire 91 of the defogger 90. The

The defogger 90 has a pair of bus bars 93 provided on the left and right sides of the rear glass 1 and a plurality of heating wires 91 connecting the two bus bars 93. In FIG. 5, only the left half of the defogger 90 is shown.

In the fifth embodiment, since the auxiliary elements 12 and 13 extending from the first element 11 are provided, the sensitivity of the high frequency DAB band 3 can be improved. Further, since the first antenna 10 (auxiliary element 12) and the defogger 90 (heating wire 91) are close to each other and the first antenna 10 is capacitively coupled to the defogger 90, the broadcast wave received by the defogger heating wire 91 can be transmitted. The first antenna 10 can be guided, and the sensitivity of the first antenna 10 can be improved. In particular, the sensitivity of the high frequency DAB band 3 can be improved.

<Example 6>
FIG. 6 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a sixth embodiment of the present invention.

The glass antenna of the sixth embodiment is different from the fifth embodiment in that it has the first antenna 10 and the parasitic element 40, and the second elements (21, 22) and the parasitic element 40 are capacitively coupled.

The glass antenna of the sixth embodiment is constituted by the first antenna 10 and the parasitic element 40. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22.

The parasitic element 40 is composed of a plurality of horizontal filaments 42 and one or more vertical filaments 43 connecting the horizontal filaments 42, and no feeding part is provided. That is, the parasitic element 40 is a conductor that is not connected to the ground. The number of horizontal filaments 42 may be one or more, and the number of vertical filaments 43 may be plural as long as it is one or more.

The auxiliary element 12 is disposed in close proximity to the defogger 90 so as to be capacitively coupled to the uppermost heating wire 91 of the defogger 90.

The defogger 90 includes a pair of bus bars 93 provided on the left and right of the rear glass 1, a plurality of heating wires 91 that connect the two bus bars 93, and a vertical wire 92 that connects the plurality of heating wires 91. And have. In FIG. 6, only the left half of the defogger 90 is shown.

The main body portion 21 of the second element is disposed close to the parasitic element 40 (for example, 10 mm apart in parallel) so as to be capacitively coupled to the lowermost horizontal filament 42A of the parasitic element 40. .

Since the configuration of the sixth embodiment other than that described above is the same as that of the fifth embodiment, the same reference numerals are given and description thereof is omitted.

In the sixth embodiment, the main body portion 21 of the second element and the horizontal filament 42 of the parasitic element 40 are disposed close to each other, and the first antenna 10 and the parasitic element 40 are capacitively coupled. The broadcast wave received by can be guided to the first antenna 10 and the sensitivity of the antenna can be improved. Further, by adjusting the length and relative positional relationship of the parasitic element 40, it is possible to improve the sensitivity in the low frequency FM radio broadcast band.

<Example 7>
FIG. 7 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a seventh embodiment of the present invention.

The glass antenna of the seventh embodiment has a first antenna 10 and a second antenna 50, and is different from the fifth embodiment in that the second elements (21, 22) and the second antenna 50 are capacitively coupled.

The glass antenna of the seventh embodiment is constituted by the first antenna 10 and the second antenna 50. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22.

The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53 connecting the horizontal filaments 52, and a second power feeding unit 54. The intervals between the vertical filaments 53 may be equal or different. By adjusting the interval between the vertical stripes 53, the sensitivity of the FM radio broadcast band can be improved. The number of horizontal filaments 52 may be one or more, and the number of vertical filaments 53 may be one or more. In the second antenna 50, each filament is arranged so that a reception effective area for suitably receiving the AM radio broadcast band (526.5 to 1606.5 kHz) can be obtained.

The second power feeding portion 54 is provided at the end of the horizontal filament 52, at the center of the horizontal filament 52 (for example, at the intersection of the horizontal filament 52B and the vertical filament 53), or provided at other locations. Also good. The 2nd electric power feeding part 54 is connected with a receiving amplifier by a connection line (for example, AV electric wire), and a receiving amplifier is connected to a receiver by a high frequency cable (for example, coaxial cable). The receiving amplifier is connected to the ground (vehicle body).

The second elements (21, 22) are disposed close to the horizontal filament 52A of the second antenna 50, and the first antenna 10 and the second antenna 50 are capacitively coupled.

Although the defogger is not shown in FIG. 7, the defogger 90 may be provided so as to be capacitively coupled to the auxiliary element 12, or the defogger 90 may not be provided.

The main body portion 21 of the second element is disposed along the second antenna 50 so as to be capacitively coupled to the horizontal line 52A below the second antenna 50 (for example, 10 mm apart in parallel).

Since the configuration of the seventh embodiment other than that described above is the same as that of the fifth embodiment, the same reference numerals are given and description thereof is omitted.

In the seventh embodiment, the main body portion 21 of the second element is disposed close to the horizontal line 52 of the second antenna 50, and the first antenna 10 and the second antenna 50 are capacitively coupled. The received broadcast wave can be guided to the first antenna 10, and the sensitivity of the first antenna 10 can be improved. Moreover, the sensitivity in the FM radio broadcast band of a low frequency can be improved by adjusting the length and relative positional relationship of the filaments 52 and 53 of the second antenna 50.

Also, the second antenna 50 for other frequencies (for example, for receiving AM radio broadcasts) can be configured with a simple structure.

<Example 8>
FIG. 8 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern according to an eighth embodiment of the present invention.

The glass antenna of the eighth embodiment is different from the seventh embodiment in that the horizontal filament 52B of the second antenna 50 is disposed between the auxiliary element 13 of the first antenna 10 and the folded portion 22.

The glass antenna of the eighth embodiment is constituted by the first antenna 10 and the second antenna 50. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, and a second power feeding unit 54.

In the eighth embodiment, the left side of the lowest horizontal filament 52B enters the area where the first antenna 10 is provided. That is, the left side of the horizontal filament 52B is close to the auxiliary element 13 and the folded portion 22 of the first antenna 10 in close proximity to and along the auxiliary element 13 and close to the folded portion 22. It arrange | positions substantially parallel. That is, the left side of the horizontal filament 52B is disposed between the first element 11 and the second element (21, 22) of the first antenna 10. A plurality of horizontal filaments 52 (for example, two horizontal filaments 52) may be disposed between the first element 11 and the second element (21, 22).

Moreover, the 2nd electric power feeding part 54 of the 2nd antenna 50 is connected via the connecting wire 55 extended | stretched from the horizontal wire 52C.

Although the defogger is not shown in FIG. 8, the defogger 90 may be provided so as to be capacitively coupled to the auxiliary element 12, or the defogger 90 may not be provided.

Since the configuration of the eighth embodiment other than that described above is the same as that of the seventh embodiment, the same reference numerals are given and description thereof is omitted.

In the eighth embodiment, since the horizontal filament 52 is disposed between the first element 11 and the second element (21, 22), the coupling between the first antenna 10 and the second antenna 50 becomes strong, and the first The antenna 10 and the second antenna 50 are susceptible to each other. For this reason, the first antenna 10 becomes sensitive to changes in characteristics due to adjustment of the element length and relative positional relationship of the second antenna 50, and the characteristics of the first antenna 10 can be easily adjusted.

<Example 9>
FIG. 9 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a ninth embodiment of the present invention.

The glass antenna of the ninth embodiment is the same as that of the eighth embodiment in that the horizontal filament 52D of the second antenna 50 has a folded portion 56, and the second feeder 54 is disposed at the end of the lower horizontal filament 52E. Different.

The glass antenna of the ninth embodiment is constituted by the first antenna 10 and the second antenna 50. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second power feeding unit 54, and a folded part 56.

In the second antenna 50 of the ninth embodiment, the second feeding portion 54 is disposed at the left end portion of the lower horizontal filament 52E. For this reason, the 1st electric power feeding part 15 of the 1st antenna 10 and the 2nd electric power feeding part 54 of the 2nd antenna 50 are arrange | positioned adjacently, and the operation | work which connects a connection line to the electric power feeding part of each antenna becomes easy.

Further, a folded portion 56 is provided at the right end of the horizontal filament 52D of the second antenna 50. The folded portion 56 extends downward from the right end of the horizontal filament 52D, is folded in the left direction, and extends in the left direction close to the horizontal filament 52D (for example, 5 mm apart in parallel).

Although the defogger is not shown in FIG. 9, the defogger 90 may be provided so as to be capacitively coupled to the auxiliary element 12, or the defogger 90 may not be provided.

Since the configuration of the ninth embodiment other than that described above is the same as that of the seventh embodiment, the same reference numerals are given and description thereof is omitted.

In the ninth embodiment, since the folded portion 56 is provided, the sensitivity of the first antenna 10 can be improved without greatly changing the characteristics of the second antenna 50.

<Example 10>
FIG. 10 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a tenth embodiment of the present invention.

The glass antenna of the tenth embodiment is different from the ninth embodiment in the direction in which the folded portion 56 is folded from the horizontal filament 52D.

The glass antenna of the tenth embodiment is constituted by the first antenna 10 and the second antenna 50. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second power feeding unit 54, and a folded part 56.

A folded portion 56 is provided at the right end of the horizontal filament 52D of the second antenna 50. The folded portion 56 extends upward from the right end of the horizontal line 52D, is folded leftward, and extends in the left direction in close proximity (for example, 5 mm apart in parallel) along the horizontal line 52D.

In FIG. 10, the defogger is not shown, but the defogger 90 may be provided so as to be capacitively coupled to the auxiliary element 12, or the defogger 90 may not be provided.

Since the configuration of the tenth embodiment other than the above is the same as that of the ninth embodiment, the same reference numerals are given and description thereof is omitted.

In the tenth embodiment, since the folded portion 56 is formed by folding the horizontal filament 52 upward, the sensitivity of the first antenna 10 in the FM radio broadcast band (particularly, the middle band) can be improved.

<Example 11>
FIG. 11 shows an antenna pattern of an eleventh embodiment of the present invention and is a front view of a glass antenna provided on a rear glass 1 of an automobile.

The glass antenna of the eleventh embodiment differs from the tenth embodiment in that the folded portion 56 is capacitively coupled to the body flange 2.

The glass antenna of the eleventh embodiment is constituted by the first antenna 10 and the second antenna 50. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second power feeding unit 54, and a folded part 56.

A folded portion 56 is provided at the right end of the uppermost horizontal filament 52F of the second antenna 50. The folded portion 56 extends upward from the right end of the horizontal line 52D, is folded leftward, and extends in the left direction in close proximity (for example, 5 mm apart in parallel) along the horizontal line 52D. The folded portion 56 is disposed close to the body flange 2 of the vehicle body (for example, 5 mm apart and in parallel), and is capacitively coupled to the body flange (ie, ground).

Although the defogger is not shown in FIG. 11, the defogger 90 may be provided so as to be capacitively coupled to the auxiliary element 12, or the defogger 90 may not be provided.

Since the configuration of the eleventh embodiment other than that described above is the same as that of the ninth embodiment, the same reference numerals are given and description thereof is omitted.

In the eleventh embodiment, since the folded portion 56 is capacitively coupled to the body flange 2, adjusting the length of the folded portion 56 and the distance from the body flange 2 allows the first portion in the FM radio broadcast band (particularly, the middle band). The sensitivity of one antenna 10 can be improved.

<Example 12>
FIG. 12 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a twelfth embodiment of the present invention.

The glass antenna of the twelfth embodiment differs from the eleventh embodiment in that it has two folded portions 56 and 57.

The glass antenna of the twelfth embodiment is constituted by the first antenna 10 and the second antenna 50. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second power feeding unit 54, and folded portions 56 and 57.

A folded portion 56 is provided at the right end of the uppermost horizontal filament 52F of the second antenna 50. The folded portion 56 extends upward from the right end of the horizontal line 52D, is folded leftward, and extends in the left direction in close proximity (for example, 5 mm apart in parallel) along the horizontal line 52D. A folded portion 57 is provided in the middle of the horizontal filament 52F. The folded portion 57 extends upward from the horizontal line 52D, is folded leftward, and extends close to the horizontal line 52D (for example, 5 mm apart in parallel). The folded portions 56 and 57 are disposed close to the body flange 2 of the vehicle body (for example, 5 mm apart and in parallel), and capacitively coupled to the body flange 2 (ie, ground).

Note that the number of folded portions may be one as shown in FIG. 11, two as shown in FIG. 12, or three or more.

Although the defogger is not shown in FIG. 12, the defogger 90 may be provided so as to be capacitively coupled to the auxiliary element 12, or the defogger 90 may not be provided.

Since the configuration of the twelfth embodiment other than the above is the same as that of the ninth embodiment, the same reference numerals are given and description thereof is omitted.

In the twelfth embodiment, since the two folded portions 56 and 57 are capacitively coupled to the body flange 2, the adjustment range of the antenna characteristics can be expanded.

<Example 13>
FIG. 13 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern of a thirteenth embodiment of the present invention.

The glass antenna of the thirteenth embodiment differs from the twelfth embodiment in that it has auxiliary filaments 58.

The glass antenna of the thirteenth embodiment is constituted by the first antenna 10 and the second antenna 50. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second feeding part 54, folded parts 56 and 57, and auxiliary filaments 58.

The auxiliary filament 58 extends outward from the second power feeding portion 54 (the direction opposite to the direction in which the horizontal filament 52 extends), bends downward, and extends along the third element 31. In addition, you may extend | stretch the auxiliary filament 58 to the outer side (direction opposite to the direction where the horizontal filament 52 extends | stretches) linearly.

Further, the folded portion 57 of the thirteenth embodiment extends upward from the intersection of the horizontal line 52D and the vertical line 53, is folded leftward, and closes along the horizontal line 52D (for example, 5 mm apart). In parallel).

In addition, as long as the position where a folding | turning part extends | stretches from the horizontal filament 52D is on the horizontal filament 52D, as shown in FIG. 12, even if it is the intersection of the horizontal filament 52D and the vertical filament 53 as shown in FIG. But you can.

Although the defogger is not shown in FIG. 13, the defogger 90 may be provided so as to be capacitively coupled to the auxiliary element 12, or the defogger 90 may not be provided.

Since the configuration of the thirteenth embodiment other than the above is the same as that of the ninth embodiment, the same reference numerals are given and description thereof is omitted.

In the thirteenth embodiment, since the auxiliary filament 58 extending in the direction opposite to the direction in which the horizontal filament 52 extends from the second power feeding portion 54 is provided, the length and the extending direction of the auxiliary filament 58 are adjusted to adjust the first By changing the characteristics of the two antennas 50, the sensitivity of the first antenna 10 in the FM radio broadcast band (especially the middle band) can be improved.

<Example 14>
FIG. 14 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern according to a fourteenth embodiment of the present invention.

The glass antenna of the fourteenth embodiment differs from the thirteenth embodiment in that it has a third antenna 60.

The glass antenna of the fourteenth embodiment is constituted by the first antenna 10, the second antenna 50, and the third antenna 60. The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second feeding part 54, folded parts 56 and 57, and auxiliary filaments 58. The third antenna 60 includes two horizontal elements 61 and 62 arranged along each other, and a third power feeding unit 63, and includes at least one of FM radio broadcast band, TV broadcast band, and DAB band 3. It is adjusted to a length suitable for receiving broadcast waves.

The third antenna 60 is arranged at a position distant from the first antenna 10, constitutes a diversity antenna with the first antenna 10, and receives FM radio broadcasts with diversity.

In FIG. 14, the defogger 90 is illustrated, but the defogger 90 may not be provided. The defogger 90 includes a pair of bus bars 93 provided on the left and right sides of the rear glass 1, a plurality of heating wires 91 that connect the two bus bars 93, and vertical wires 92 that connect the plurality of heating wires 91. Have The number of vertical filaments 92 may be one or more.

The auxiliary element 12 is arranged close to the defogger 90 so as to be capacitively coupled to the uppermost heating wire 91 of the defogger 90. For this reason, the broadcast wave which the heating filament 91 received can be guide | induced to the 1st antenna 10, and the sensitivity of an antenna can be improved.

Since the configuration of the 14th embodiment other than the above is the same as that of the 13th embodiment, the same reference numerals are given and description thereof is omitted.

In the fourteenth embodiment, since diversity reception is performed by the first antenna 10 and the third antenna 60, it becomes easier to receive incoming waves, and reception performance can be improved.

<Example 15>
FIG. 15 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a fifteenth embodiment of the present invention.

The glass antenna of the fifteenth embodiment differs from the fourteenth embodiment in that the defogger 90 functions as a third antenna.

The glass antenna of the fifteenth embodiment is constituted by the first antenna 10, the second antenna 50, and the third antenna 60. Note that, as will be described later, the defogger 90 functions as the third antenna 60.

The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second feeding part 54, folded parts 56 and 57, and auxiliary filaments 58.

The defogger 90 functioning as the third antenna 60 connects a pair of bus bars 93 provided on the left and right sides of the rear glass 1, a plurality of heating wires 91 connecting the two bus bars 93, and a plurality of heat wires 91. And a vertical line 92. The number of vertical filaments 92 may be one or more. Since the defogger 90 of the fifteenth embodiment functions as a third antenna, the heating filament 91 and the vertical filament 92 constituting the defogger 90 function as a horizontal filament and a vertical filament of the third antenna 60, respectively.

The bus bar 93 is provided with a defogger coil 94 and a third power feeding unit 95. That is, one bus bar 93 is connected to the power source via the defogger coil 94, and the other bus bar 93 is connected to the ground via the defogger coil 94. The defogger coil 94 suppresses noise in the reception frequency band that flows into the third antenna 60 from the power source and the ground. In addition, a third power feeding unit 95 is provided on one (eg, power supply side) bus bar 93. The third power feeding unit 95 is connected to the reception amplifier by a connection line (for example, an AV electric wire), and the reception amplifier is connected to the receiver by a high-frequency cable (for example, a coaxial cable). The receiving amplifier is connected to the ground (vehicle body).

The defogger coil 94 and the third power supply unit 95 are arranged at the center of the bus bar 93 with the defogger coil 94 on the upper side and the third power supply unit 95 on the lower side, but the positions where the defogger coil 94 and the third power supply unit 95 are arranged. Can be anywhere on the bus bar 93. Furthermore, the order (upper and lower positional relationship) in which the defogger coil 94 and the third power feeding unit 95 are arranged is not limited to that illustrated.

When the third antenna 60 (defogger 90) receives a DAB band 3 broadcast wave, a power supply unit may be provided separately from the power supply unit that extracts the received FM radio broadcast wave. In this case, the FM radio broadcast wave power supply unit and the DAB broadcast wave power supply unit may be provided in different (opposing) bus bars 93.

The third antenna 60 constitutes a diversity antenna with the first antenna 10 and receives at least one broadcast wave of FM radio broadcast and DAB band 3 broadcast with diversity.

The auxiliary element 12 is arranged close to the defogger 90 so as to be capacitively coupled to the uppermost heating wire 91 of the defogger 90.

Since the configuration of the fifteenth embodiment other than the above is the same as that of the fourteenth embodiment, the same reference numerals are given and description thereof is omitted.

In the fifteenth embodiment, since the third antenna 60 is configured by the filaments 91 and 92 of the defogger 90, it is not necessary to provide a separate antenna element, and deterioration in appearance can be suppressed. Moreover, since the 3rd electric power feeding part 95 is provided in the bus bar 93, the electric power feeding part of a high frequency signal and the electric power feeding part of a heating wire can be shared. Further, since the bus bar 93 is connected to the power source and the ground via the defogger coil 94, the bus bar 93 can be connected to the power source and the ground for direct current and can be floated from the power source and the ground for high frequency.

<Example 16>
FIG. 16 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern of a sixteenth embodiment of the present invention.

The glass antenna of the sixteenth embodiment differs from the fifteenth embodiment in that auxiliary filaments 96, 97, and 98 extending from the lowest horizontal filament 91 of the third antenna 60 are provided. The first antenna 10 is different from the fifteenth embodiment in that the configuration of the second embodiment is adopted.

The glass antenna of the sixteenth embodiment is constituted by the first antenna 10 and the third antenna 60. In FIG. 16, only the first antenna 10 and the third antenna 60 (defogger 90) are shown. However, the second antenna 50 of another embodiment described above may be provided, and the second antenna 50 and the body flange may be provided. 2 may be capacitively coupled.

The 1st antenna 10 has the 1st electric power feeding part 15, the 1st element 11, and the 2nd element. The second element includes a main body portion 21 and a folded portion 22. The configuration of the first antenna is not limited to that shown in the drawing, and the configuration of any of the above-described embodiments may be employed. For example, the first antenna 10 may include the auxiliary element 12 that is capacitively coupled to the uppermost horizontal line 91 of the third antenna 60.

The defogger 90 functioning as the third antenna 60 is composed of a pair of bus bars 93 provided on the left and right of the rear glass 1, a plurality of heating wires 91 connecting the two bus bars 93, and the lowermost heating wire 91. It has parallel auxiliary filaments 96, 97, 98 that extend. Note that the defogger 90 may have one or a plurality of vertical filaments 92 that connect the plurality of heating filaments 91. Since the defogger 90 of the sixteenth embodiment functions as a third antenna, the heating wire 91 constituting the defogger 90 functions as a horizontal wire of the third antenna 60. The bus bar 93 is provided with a defogger coil 94 and a third power feeding unit 95.

The parallel auxiliary filaments 96 are arranged so as to extend downward from the lowest horizontal filament 91 and to extend leftward along the horizontal filament 91. The parallel auxiliary filaments 97 are arranged so as to extend from the middle of the parallel auxiliary filaments 96 substantially horizontally to the left, then bend downward, and further extend to the left along the horizontal filaments 91. The parallel auxiliary filaments 98 are arranged so as to extend downward from the lowermost horizontal filament 91 and to extend rightward along the horizontal filament 91.

The ends of the parallel auxiliary filaments 96, 97, and 98 are at positions separated from each other. Further, a part of the parallel auxiliary line 96 and a part of the parallel auxiliary line 97 are arranged in close proximity to each other so as to be along each other. Furthermore, a part of the parallel auxiliary line 97 and a part of the parallel auxiliary line 98 are arranged in close proximity to each other so as to be along each other. Thus, since two parallel auxiliary filaments 96, 97, and 98 are arranged so as to overlap (dashed line portion), each parallel auxiliary filament is capacitively coupled at the end. In addition, it may be arrange | positioned so that not only a part of parallel auxiliary filament but almost all may mutually follow.

It should be noted that the number of auxiliary filaments extending along the horizontal filament 91 may be two as shown in FIG. 17, three as shown in FIGS. 16 and 18, or four or more. The position where the parallel auxiliary filaments 96, 97, 98 extend from the defogger 90 may be from the bus bar 93 as shown in FIG. 17 or from the horizontal filament 91 as shown in FIGS.

Since the configuration of the sixteenth embodiment other than that described above is the same as that of the fifteenth embodiment, the same reference numerals are given and description thereof is omitted.

In the sixteenth embodiment, since the parallel auxiliary filaments 96, 97, and 98 are arranged so that the two are arranged close to each other, by adjusting the width and length of the overlap of the parallel auxiliary filaments, The sensitivity of the third antenna 60 can be improved, and the sensitivity of other antennas constituting the diversity can be improved.

<Example 17>
FIG. 17 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern according to a seventeenth embodiment of the present invention.

The glass antenna of the seventeenth embodiment differs from the fifteenth embodiment in that auxiliary filaments 96 and 98 extending from the bus bar are provided.

The glass antenna of the seventeenth embodiment is constituted by the first antenna 10 and the third antenna 60. In FIG. 17, only the first antenna 10 and the third antenna 60 (defogger 90) are shown. However, the second antenna 50 of another embodiment described above may be provided, and the second antenna 50 and the body flange may be provided. 2 may be capacitively coupled.

The 1st antenna 10 has the 1st electric power feeding part 15, the 1st element 11, and the 2nd element. The second element includes a main body portion 21 and a folded portion 22. The configuration of the first antenna is not limited to that shown in the drawing, and the configuration of any of the above-described embodiments may be employed.

The defogger 90 functioning as the third antenna 60 includes a pair of bus bars 93 provided on the left and right sides of the rear glass 1, a plurality of heating wires 91 connecting the two bus bars 93, and parallel auxiliary lines extending from the bus bar 93. Articles 96 and 98 are included. The bus bar 93 is provided with a defogger coil 94 and a third power feeding unit 95.

The parallel auxiliary filaments 96 are arranged so as to extend downward from the right bus bar 93 and extend to the left along the horizontal filaments 91. The parallel auxiliary filaments 98 are arranged so as to extend downward from the left bus bar 93 and to extend rightward along the horizontal filaments 91. The ends of the parallel auxiliary filaments 96 and 98 are located at positions separated from each other. Further, a part of the parallel auxiliary line 96 and a part of the parallel auxiliary line 98 are arranged in close proximity to each other so as to be along each other. Thus, since two parallel auxiliary filaments 96 and 98 are arranged so as to overlap (dashed line portion), each parallel auxiliary filament is capacitively coupled at the end. In addition, it may be arrange | positioned so that not only a part of parallel auxiliary filament but almost all may mutually follow.

Since the configuration of the seventeenth embodiment other than the above is the same as that of the sixteenth embodiment, the same reference numerals are given and description thereof is omitted.

In the seventeenth embodiment, since the parallel auxiliary filaments 96 and 98 extend from the bus bar 93, the parallel auxiliary filaments are lengthened, and the length of overlap of the parallel auxiliary filaments is increased to increase the adjustment range. be able to.

<Example 18>
FIG. 18 is a front view of a glass antenna provided on a rear glass 1 of an automobile, showing an antenna pattern of an eighteenth embodiment of the present invention.

The glass antenna of the eighteenth embodiment differs from the fifteenth embodiment in that auxiliary wires 96, 97, 98, 89 extending from the bus bar are provided, and the fourth antenna 70 is provided.

The glass antenna of the eighteenth embodiment is constituted by the first antenna 10, the third antenna 60, and the fourth antenna 70. In FIG. 18, only the first antenna 10, the third antenna 60 (defogger 90), and the fourth antenna 70 are shown, but the second antenna 50 of the other embodiments described above may be provided, The antenna 50 and the body flange 2 may be capacitively coupled.

The 1st antenna 10 has the 1st electric power feeding part 15, the 1st element 11, and the 2nd element. The second element includes a main body portion 21 and a folded portion 22. The configuration of the first antenna is not limited to that shown in the drawing, and the configuration of any of the above-described embodiments may be employed. For example, the first antenna 10 may include the auxiliary element 12 that is capacitively coupled to the uppermost horizontal line 91 of the third antenna 60.

The defogger 90 functioning as the third antenna 60 includes a pair of bus bars 93 provided on the left and right sides of the rear glass 1, a plurality of heating wires 91 connecting the two bus bars 93, and parallel auxiliary lines extending from the bus bar 93. It has strips 96, 97, 98 and an auxiliary strip 89. The bus bar 93 is provided with a defogger coil 94 and a third power feeding unit 95.

The parallel auxiliary filaments 96 are arranged so as to extend downward from the bus bar 93 and to extend leftward along the horizontal filaments 91. The parallel auxiliary filaments 97 are arranged so as to extend from the middle of the parallel auxiliary filaments 96 substantially horizontally to the left, then bend downward, and further extend to the left along the horizontal filaments 91. The parallel auxiliary filaments 98 are arranged so as to extend downward from the bus bar 93 and to extend rightward along the horizontal filaments 91.

The ends of the parallel auxiliary filaments 96, 97, and 98 are at positions separated from each other. Further, a part of the parallel auxiliary line 96 and a part of the parallel auxiliary line 97 are arranged in close proximity to each other so as to be along each other. Furthermore, a part of the parallel auxiliary line 97 and a part of the parallel auxiliary line 98 are arranged in close proximity to each other so as to be along each other. Thus, since two parallel auxiliary filaments 96, 97, and 98 are arranged so as to overlap (dashed line portion), each parallel auxiliary filament is capacitively coupled at the end. In addition, it may be arrange | positioned so that not only a part of parallel auxiliary filament but almost all may mutually follow.

The auxiliary filament 89 extends upward from the bus bar 93 on the right side (where the third power feeding unit 95 is provided), and is bent and extended in the left direction. The auxiliary filament 89 may extend from the outermost horizontal filament 91. The auxiliary filament 89 may be bent in the right direction without being bent in the left direction, and may be bent only in the upward direction.

Further, the auxiliary filament 89 may be extended downward from the defogger 90 (the bus bar 93, the lowest horizontal filament 91), and may be extended along the horizontal filament 91. In this case, the auxiliary filament 89 functions as a parallel auxiliary filament.

The auxiliary filament 89 may extend downward from the right bus bar 93 or may extend upward or downward from the left bus bar 93. In particular, when the auxiliary wire 89 is connected to the lower end of the bus bar 93 provided with the third power supply unit 95, the sensitivity of the high frequency DAB band 3 can be improved. On the other hand, when the auxiliary wire 89 is connected to the upper end, the sensitivity of a separately provided antenna for television broadcast reception (particularly, 170 to 230 MHz VHF-High Band) can be improved.

The fourth antenna 70 includes a fourth power feeding unit 71 and a horizontal element 72, and is adjusted to a length suitable for receiving a TV broadcast band (470 to 770 MHz). In this case, a diversity antenna may be configured by the third antenna 60 and the fourth antenna 70 to receive the TV broadcast diversity. The 4th electric power feeding part 71 is connected with a receiving amplifier by a connection line (for example, AV electric wire), and a receiving amplifier is connected to a receiver by a high frequency cable (for example, coaxial cable). The receiving amplifier is connected to the ground (vehicle body).

When the auxiliary filament 89 bends in the left or right direction, the end of the auxiliary filament 89 may be disposed close to the fourth antenna 70.

Since the configuration of the eighteenth embodiment other than that described above is the same as that of the sixteenth embodiment, the same reference numerals are given and description thereof is omitted.

In the eighteenth embodiment, since the auxiliary filament 89 is provided on the third antenna 60, the sensitivity of the third antenna 60 can be improved. In addition, since the auxiliary filament 89 is disposed close to the fourth antenna 70, the sensitivity of the antenna (for example, the fourth antenna 70) provided around the third antenna 60 can be improved.

<Example 19>
FIG. 19 shows an antenna pattern of a nineteenth embodiment of the present invention, and is a front view of a glass antenna provided on a rear glass 1 of an automobile.

The glass antenna of the nineteenth embodiment differs from the eighteenth embodiment in that the third antenna 60 (defogger 90) has a vertical line 92.

The glass antenna of the nineteenth embodiment is constituted by the first antenna 10, the third antenna 60, and the fourth antenna 70. In FIG. 19, only the first antenna 10, the third antenna 60 (defogger 90), and the fourth antenna 70 are shown, but the second antenna 50 of the other embodiments described above may be provided, The antenna 50 and the body flange 2 may be capacitively coupled.

The 1st antenna 10 has the 1st electric power feeding part 15, the 1st element 11, and the 2nd element. The second element includes a main body portion 21 and a folded portion 22. The configuration of the first antenna is not limited to that shown in the drawing, and the configuration of any of the above-described embodiments may be employed. For example, the first antenna 10 may include the auxiliary element 12 that is capacitively coupled to the uppermost horizontal line 91 of the third antenna 60.

The defogger 90 functioning as the third antenna 60 includes a bus bar 93, a heating filament 91, a vertical filament 92, parallel auxiliary filaments 96, 97, 98, and an auxiliary filament 89. Since the defogger 90 of the nineteenth embodiment functions as a third antenna, the heating filament 91 and the vertical filament 92 constituting the defogger 90 function as a horizontal filament and a vertical filament of the third antenna 60, respectively. The number of the vertical stripes 92 is not limited to the three illustrated, but may be one, two, or four or more. The bus bar 93 is provided with a defogger coil 94 and a third power feeding unit 95.

The fourth antenna 70 includes a fourth power feeding unit 71 and a horizontal element 72, and is adjusted to a length suitable for receiving a TV broadcast band (470 to 770 MHz).

Since the configuration of the nineteenth embodiment other than the above is the same as that of the eighteenth embodiment, the same reference numerals are given and description thereof is omitted.

In the nineteenth embodiment, since the vertical line 92 for connecting the horizontal line 91 is provided, the sensitivity of the third antenna 60 can be improved.

<Example 20>
FIG. 20 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern of a twentieth embodiment of the present invention.

The glass antenna of the twentieth embodiment differs from the nineteenth embodiment in that the third antenna 60 (defogger 90) has a horizontal auxiliary line 99.

The glass antenna of the twentieth embodiment is constituted by the first antenna 10, the third antenna 60, and the fourth antenna 70. In FIG. 20, only the first antenna 10, the third antenna 60 (defogger 90), and the fourth antenna 70 are illustrated, but the second antenna 50 of the other embodiments described above may be provided, The antenna 50 and the body flange 2 may be capacitively coupled.

The 1st antenna 10 has the 1st electric power feeding part 15, the 1st element 11, and the 2nd element. The second element includes a main body portion 21 and a folded portion 22. The configuration of the first antenna is not limited to that shown in the drawing, and the configuration of any of the above-described embodiments may be employed. For example, the first antenna 10 may include the auxiliary element 12 that is capacitively coupled to the uppermost horizontal line 91 of the third antenna 60.

The defogger 90 functioning as the third antenna 60 includes a bus bar 93, a heating wire 91, a vertical wire 92, parallel auxiliary wires 96, 97, 98, an auxiliary wire 89, and a horizontal auxiliary wire 99. Have The bus bar 93 is provided with a defogger coil 94 and a third power feeding unit 95.

The horizontal auxiliary line 99 is constituted by a horizontal part extending downward from the lowermost horizontal line 91 and extending along the horizontal line 91 from the center of the defogger to the left and right sides.

The fourth antenna 70 includes a fourth power feeding unit 71 and a horizontal element 72, and is adjusted to a length suitable for receiving a TV broadcast band (470 to 770 MHz).

Since the configuration of the 20th embodiment other than the above is the same as that of the 19th embodiment, the same reference numerals are given and description thereof is omitted.

In the 20th embodiment, since the horizontal auxiliary line 99 extending along the horizontal line 91 is provided from the end of the vertical line 92, the end of the horizontal auxiliary line 99 is not connected to the defogger 90. The degree of freedom for adjusting the antenna characteristics can be increased.

<Example 21>
FIG. 21 is a front view of a glass antenna provided on the rear glass 1 of an automobile, showing an antenna pattern according to a twenty-first embodiment of the present invention.

The glass antenna of the twenty-first embodiment is composed of a first antenna 10, a second antenna 50, a third antenna 60, a fourth antenna 70, and a fifth antenna 100.

The first antenna 10 includes a first power feeding unit 15, a first element 11, a second element, a third element 31, and auxiliary elements 12 and 13. The second element includes a main body portion 21 and a folded portion 22. Since the first antenna 10 of the twenty-first embodiment has the same configuration as the first antenna 10 (FIG. 5) of the fifth embodiment, detailed description thereof is omitted.

The second antenna 50 includes a plurality of horizontal filaments 52, a plurality of vertical filaments 53, a second power feeding unit 54, and folded portions 56 and 57. Since the second antenna 50 of the twenty-first embodiment has the same configuration as the second antenna 50 (FIG. 12) of the twelfth embodiment, detailed description thereof is omitted.

The left side of the horizontal filament 52B is close to the auxiliary element 13 and the folded portion 22 of the first antenna 10 in close proximity to and substantially parallel to the auxiliary element 13 and close to and substantially parallel to the folded portion 22. Placed in. For this reason, the first antenna 10 and the second antenna 50 are capacitively coupled. Further, the folded portions 56 and 57 are arranged close to the body flange 2 of the vehicle body (for example, 5 mm apart and in parallel), and the second antenna 50 and the body flange 2 (that is, ground) are capacitively coupled.

The defogger 90 functioning as the third antenna 60 includes a bus bar 93, a heating wire 91, a vertical wire 92, parallel auxiliary wires 96, 97, 98, an auxiliary wire 89, and a horizontal auxiliary wire 99. Have The bus bar 93 is provided with a defogger coil 94 and a third power feeding unit 95. Since the third antenna 60 of the twenty-first embodiment has the same configuration as the third antenna 60 (FIG. 20) of the twentieth embodiment, detailed description thereof is omitted.

The fourth antenna 70 includes a fourth power feeding unit 71, a plurality of horizontal elements 72, and a plurality of vertical elements 73, and is adjusted to a length suitable for receiving a TV broadcast band (470 to 770 MHz).

The horizontal element 72 is disposed close to the horizontal filament 52 of the second antenna 50, and the fourth antenna 70 and the second antenna 50 are capacitively coupled. Further, the horizontal element 72 is disposed in the vicinity of the auxiliary filament 89 of the third antenna 60, and the fourth antenna 70 and the third antenna 60 are capacitively coupled.

The fifth antenna 100 has a fifth feeding portion, a plurality of vertical wires, and a single horizontal wire. The fifth power feeding unit is connected to the reception amplifier by a connection line (for example, an AV electric wire), and the reception amplifier is connected to the receiver by a high-frequency cable (for example, a coaxial cable). The receiving amplifier 6 is connected to the ground (vehicle body).

The following description (FIGS. 22 to 24) is antenna sensitivity when the arrangement or length of the elements described below is changed, and the configuration of other elements is not changed. The antenna sensitivity is a value obtained by measuring the antenna sensitivity in all directions (360 degrees) in the horizontal plane and calculating the average.

FIG. 22 shows the antenna gain (sensitivity) in DAB band 3 when the length of the folded portion 22 is changed in the antenna of the twenty-first embodiment. The length of the main body 21 was 460 mm, and the distance between the main body 21 and the folded portion 22 was constant at 7 mm. In FIG. 22, the characteristic when the length of the folded portion 22 is 300 mm is shown by a solid line, the characteristic when 400 mm is set by a broken line, and the characteristic when 200 mm is set by a dashed line. According to FIG. 22, when the length of the folded portion 22 is 300 mm, the gain drop on the high frequency side is small, and the average gain in the band is the highest. Therefore, the length of the folded portion 22 can be said to have a good degree αλ _2/4. Note that λ ₂ is the wavelength (1.5 m) of the center frequency 210 MHz of DAB band 3.

FIG. 23 shows the antenna gain (sensitivity) in the FM radio broadcast band when the length of the main body 21 is changed in the antenna of the twenty-first embodiment. The length of the folded portion 22 was 300 mm, and the distance between the main body portion 21 and the folded portion 22 was constant at 7 mm. In FIG. 23, the characteristic when the length of the main body portion 21 is 460 mm is indicated by a solid line, the characteristic when it is 410 mm is indicated by a broken line, and the characteristic when it is 510 mm is indicated by an alternate long and short dash line. According to FIG. 23, when the length of the main body portion 21 is 460 mm, it has a flat characteristic in the band and the average gain in the band is the highest. Therefore, the length of the body portion 21 can be said to be about αλ _1/5. Note that λ ₁ is a wavelength (3.3 m) having a center frequency of 92 MHz in the FM radio broadcast band.

FIG. 24 shows the antenna gain (sensitivity) in the FM radio broadcast band when the length of the first element 11 is changed in the antenna of the twenty-first embodiment. The length of the vertical portion of the first element 11 was constant at 20 mm. In FIG. 24, the characteristic when the length of the horizontal portion of the first element 11 is 400 mm is indicated by a solid line, the characteristic when it is 350 mm is indicated by a broken line, and the characteristic when it is 450 mm is indicated by an alternate long and short dash line. According to FIG. 24, when the length of the main body 21 is 400 mm, it has a flat characteristic within the band. Therefore, the length of the first element 11 is said to have good order αλ _1/6.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited to such specific configurations, and various modifications and equivalents within the spirit of the appended claims Includes configuration.

This application claims priority based on Japanese Patent Application No. 2014-12484 filed with the Japan Patent Office on January 27, 2014, the entire contents of which are incorporated herein by reference.

Claims (21)

1. A glass antenna disposed on a vehicle window glass,
   A first power supply connected to the receiver;
   A first element connected to the first power feeding unit;
   A first antenna having a second element connected to the first power feeding unit,
   The second element has a main body portion extending from the first power feeding portion, and a folded portion connected to the main body portion,
   The glass antenna according to claim 1, wherein the folded portion is folded from the main body portion and disposed along the main body portion.
2. 2. The glass antenna according to claim 1, wherein the folded portion is folded from an end portion of the main body portion and disposed adjacent to the main body portion.
3. The glass antenna is
   An antenna for receiving a first frequency band having a center frequency wavelength of λ ₁ and a second frequency band having a center frequency wavelength of λ ₂ ;
   The wavelength reduction rate of the window glass as alpha, the length of the folded portion is substantially αλ _2/4, the length of the body portion is substantially αλ _1/5, the length of the first element is substantially the glass antenna according to claim 1, characterized in that the αλ _1/6.
4. The glass antenna according to claim 1, wherein the main body of the first element and the second element are extended in the same direction.
5. The first antenna includes a third element that extends from the first power feeding unit in a direction different from a direction in which the first element extends and the main body of the second element extends. The glass antenna according to claim 4.
6. The glass antenna according to claim 1, wherein the first antenna has at least one of an auxiliary element extending from the first power feeding portion and an auxiliary element extending from the first element.
7. The glass antenna according to claim 6, wherein at least one of the auxiliary elements is close to the outermost heating filament of a defogger disposed on the window glass and capacitively coupled.
8. 2. The glass antenna according to claim 1, wherein the first antenna is close to a linear conductor disposed on the window glass and is capacitively coupled.
9. The glass antenna according to claim 8, wherein the linear conductor is a second antenna.
10. The second antenna is
    A plurality of horizontal filaments, at least one vertical filament connecting the plurality of horizontal filaments, and a second feeding part,
    The glass antenna according to claim 9, wherein the glass antenna is an antenna for receiving a third frequency band.
11. The glass antenna according to claim 10, wherein a plurality of the vertical filaments are provided.
12. The glass antenna according to claim 10, wherein at least one of the plurality of horizontal filaments is close to the second element and capacitively coupled.
13. 11. The glass antenna according to claim 10, wherein at least one of the plurality of horizontal filaments is disposed between the first element and the second element.
14. The glass antenna according to claim 10, wherein at least one of the plurality of horizontal filaments has a folded portion whose end is folded upward or downward.
15. The second power feeding unit is provided at one end of the plurality of horizontal filaments,
    The second antenna is
    A capacitive coupling wire extending from the uppermost filament of the plurality of horizontal filaments and disposed at a position for capacitive coupling to the body flange;
    11. The glass antenna according to claim 10, further comprising an auxiliary wire extending in a direction opposite to a direction in which the horizontal wire extends from the second power feeding unit.
16. The glass antenna includes a third antenna,
    The glass antenna according to claim 1, wherein the first antenna and the third antenna constitute a diversity antenna.
17. The third antenna uses a defogger line disposed on the window glass as an antenna, and the defogger is provided with a third feeding unit connected to a receiver. The glass antenna described.
18. The defogger has a pair of bus bars provided on the left and right sides of the window glass, and a plurality of heating wires connecting the two bus bars,
    The third antenna includes at least two parallel auxiliary wires extending from the horizontal wire used in combination with the plurality of heating wires and the bus bar or the outermost horizontal wire, and having end portions spaced apart from each other. And
    The glass antenna as set forth in claim 17, wherein the two parallel auxiliary filaments are arranged close to each other.
19. The glass antenna according to claim 18, wherein the third antenna has at least one auxiliary filament.
20. The glass antenna according to claim 18, wherein the third antenna has at least one vertical line connecting a plurality of horizontal lines of the third antenna.
21. 21. The glass antenna according to claim 20, further comprising a horizontal auxiliary filament extending along the horizontal filament from an end of at least one of the vertical filaments.

Images