JP5387317B2 - Glass antenna for vehicles - Google Patents

Description

  The present invention is a glass antenna suitable for receiving digital terrestrial television broadcast waves and UHF band analog television broadcast waves provided on a window glass of an automobile, and includes a front window glass and a rear window glass for an automobile. It is a non-grounded antenna provided.

  In recent years, television broadcast waves in Japan are shifting from terrestrial analog broadcasts in the 90 to 220 MHz VHF band and 470 to 770 MHz UHF band to 470 to 710 MHz terrestrial digital broadcasts. It is becoming necessary to support digital terrestrial broadcasting for the transmitting and receiving devices.

  Many conventional antenna patterns consist mainly of horizontal elements, and when these antenna patterns are provided on the front window glass or rear window glass of an automobile, the antenna is apparent against radio waves coming from the side. Since it is regarded as an upper dot shape or a short line shape and sufficient resonance cannot be obtained, there is a problem that reception sensitivity of radio waves coming from the side surface is low and directivity is insufficient.

  In order to cope with this, if an antenna is mounted on the side window glass and radio waves from the side direction are received and complemented by the diversity reception, the directional characteristics are improved and a satisfactory one can be obtained. When the antenna pattern is provided on the glass, the side window is limited to the fitting window glass, and the vehicle has no fitting window glass having an area where the antenna pattern can be installed on the side window, that is, the side window. For models that cannot install antenna patterns, diversity reception is performed by arranging multiple antennas on the front window glass and rear window glass, but satisfactory directivity characteristics for radio waves from the side of the vehicle have not been obtained. .

For example, Japanese Patent Application Laid-Open No. 2005-354139 discloses a digital television signal (maximum frequency f ₁ , corresponding wavelength λ ₁ , minimum frequency f _2). , Corresponding wavelength λ ₂ ), a vehicle glass antenna device, which is provided on a window glass of a vehicle, and has two upper antenna elements and a lower antenna element which are in a vertical relationship and extend in a horizontal direction; A glass antenna for a vehicle, comprising: a phase synthesizer that delays the phase of one of the received signals from the power supply terminals of the two antenna elements by 190 ° to 220 ° and synthesizes the two received signals An apparatus is described (Patent Document 1).

Further, for example, in Japanese Patent Laid-Open No. 2002-100914, a first antenna conductor, a second antenna conductor, a feeding point of the first antenna conductor, and a feeding point of the second antenna conductor are provided on the window glass plate of the automobile. In the automotive glass antenna provided, the first antenna conductor and the second antenna conductor intersect with each other, and at the intersecting portion, the first antenna conductor and the second antenna conductor provide an insulating layer. The angle formed between the first antenna conductor and the second antenna conductor at the intersecting portion is 60 to 120 degrees, and the conductor length L ₁ of the first antenna conductor, An automotive glass antenna is described in which the conductor length L ₂ of the second antenna conductor satisfies 0.5 · L ₂ ≦ L ₁ ≦ 2.0 · L ₂ (Patent Document 2). .

JP-A-2005-354139 JP 2002-100914 A

  Patent Document 1 uses a device that divides a glass antenna device installed on a windshield and a rear glass and synthesizes a reception signal obtained by delaying the phase of one antenna and a reception signal of the other antenna. It is intended to control directional characteristics, and is not intended to improve directivity with only an antenna.

  In addition, the grounded antenna as shown in Patent Document 2 has a description that two antennas are arranged on the same glass surface and diversity is received to improve directivity characteristics. The problem is that the directivity is remarkably brought close to non-directivity by intersecting the first conductor and the second conductor constituting the structure with the insulating layer interposed therebetween, and an insulating layer must be provided between the two conductors. There was a point.

  Furthermore, when a non-grounded terrestrial digital broadcast wave antenna is provided on the rear window glass of an automobile, there is a problem in that the directivity characteristics on the front side are deteriorated.

  The present invention has such a problem, that is, when an antenna for a non-grounded digital terrestrial broadcasting wave is provided in the margin of an automobile window glass, even if an antenna is provided on the rear window glass of the automobile, the front side It is an object to improve the directivity by obtaining a stable antenna reception gain without degrading the directivity, and obtaining good reception from the side.

That is, according to the present invention, in an antenna for digital terrestrial television broadcasting waves provided on a window glass surface of an automobile, a hot-side feeding point is provided near the vertical side of the opening of the flange of the window, and a ground-side feeding point is provided near the lower part thereof. ,
Passing through the hot-side feeding point, a hot-side closed-loop line consisting of a horizontal line and a vertical line,
A hot-side element comprising: at least one hot-side inner line extending from the hot-side feeding point into the hot-side closed-loop line and having an L shape by a horizontal line and a vertical line;
It is characterized by comprising at least two horizontal filaments extending in the horizontal direction from the ground-side feeding point and ground-side elements comprising at least two vertical filaments extending in the vertical direction from the ground-side feeding point 7. It is a glass antenna for vehicles.

  Alternatively, the present invention extends at least one first horizontal auxiliary line that branches in the horizontal direction outside the vertical line located on the side away from the hot-side feeding point of the hot-side closed loop line, The glass antenna for a vehicle described above, wherein the first vertical auxiliary wire is extended by bending from at least one tip of the first horizontal auxiliary wire.

  Alternatively, the present invention is characterized in that the second horizontal auxiliary filament is extended through a lead wire that branches and extends in the vertical direction from the middle of the horizontal filament on the lower side of the hot-side closed loop filament. It is the glass antenna for vehicles mentioned above.

Alternatively, the present invention is the glass antenna for a vehicle described above, wherein a second vertical auxiliary filament is provided from a hot-side feeding point at a position outside the hot-side closed loop filament.
Alternatively, the present invention is the above-described vehicle characterized in that the horizontal line portion at the lowermost position of the hot side element and the horizontal line portion at the uppermost position of the ground side element are capacitively coupled in proximity. It is a glass antenna.

  Alternatively, in the present invention, the vehicle glass described above is characterized in that all or a part of a plurality of horizontal wires extending from the earth-side feeding point of the earth-side element are connected to each other to form a closed loop. It is an antenna.

  Alternatively, the present invention is the above-described vehicle characterized in that the ends of all or some of the plurality of vertical wires extending from the ground-side feeding point of the ground-side element are connected to form a closed loop. It is a glass antenna.

  Alternatively, the present invention is characterized in that a central conductor of a coaxial cable is connected to a hot-side feeding point of the antenna for digital terrestrial television broadcasting, and an outer conductor of the coaxial cable is connected to a ground-side feeding point. It is the glass antenna for vehicles mentioned above.

  Alternatively, the present invention provides diversity reception by providing a plurality of the glass antennas on either the front window glass or the rear window glass of an automobile, or combining with other antennas for receiving digital terrestrial television broadcast waves. The glass antenna for a vehicle described above.

  Radio waves coming from the front-rear direction of an automobile by providing a plurality of antennas for receiving a ground-free digital terrestrial broadcast wave of the present invention on the glass plate surface of either the front window glass or the rear window glass of the automobile In addition, radio waves arriving from the left and right sides of the vehicle can be received with high sensitivity, and the directivity can be improved. In particular, even when an antenna is provided on the rear window glass of an automobile, a stable antenna reception gain can be obtained without deteriorating the directivity characteristics on the front side.

The front enlarged view of the antenna pattern of Example 1 of this invention. The front enlarged view of the antenna pattern of Example 2 of this invention. The front enlarged view of the antenna pattern of Example 3 of this invention. The front enlarged view of the antenna pattern of Example 4 of this invention. The front enlarged view of the antenna pattern of Example 5 of this invention. The front enlarged view of the antenna pattern of Example 6 of this invention. The front view which provided the antenna pattern of Example 1 of this invention in multiple places in the rear window glass, and enabled diversity reception. The front enlarged view of the antenna pattern of the comparative example 1. FIG. The frequency characteristic figure of Example 1 of this invention and Comparative Example 1. FIG. The directivity characteristic figure of Example 1 of this invention and Comparative Example 1. FIG.

  The antenna of the present invention for digital terrestrial television broadcast waves provided on the surface of the window glass 1 of an automobile includes a hot-side feeding point 6 provided in the vicinity of the vertical side of the opening of the body flange 3 of the window, and the hot-side feeding point. 6 includes a hot-side element 10 and a ground-side element 20 that are extended from the respective feeding points of the ground-side feeding point 7 provided in the vicinity of the lower portion of 6.

  The hot-side element 10 passes through the hot-side feeding point 6, and has a substantially rectangular hot-side closed loop line 11 composed of horizontal and vertical stripes, and further from the hot-side feeding point 6 to the hot-side closed loop line. It consists of at least one hot-side inner filament 12 that extends into the filament 11 and is L-shaped by a horizontal filament and a vertical filament.

  The earth side element 20 includes at least two horizontal filaments 21, 21... Extending from the earth side feeding point 7 in the horizontal direction and at least two lines extending from the earth side feeding point 7 in the vertical direction. It consists of vertical filaments 22, 22.

  Further, at least one first horizontal auxiliary line 13, 13,... Branching in the horizontal direction outside the vertical line 11b located on the side away from the hot side feeding point 6 of the hot side closed loop line 11 is provided. , And the first vertical auxiliary line 14 bent downward from the tip of at least one first horizontal auxiliary line 13 of the first horizontal auxiliary line 13, 13... May be extended.

  Furthermore, the second horizontal auxiliary line 16 may be extended through a lead line that extends in the vertical direction from the middle of the horizontal line 11a on the lower side of the hot side closed loop line 11.

Furthermore, the second vertical auxiliary line 15 may be extended from the hot side feeding point 6 in parallel with the vertical line 11b at a position outside the hot side closed loop line 11.
The horizontal line portion at the lowest position of the hot side element 10 including the second horizontal auxiliary line 16 is capacitively coupled to the horizontal line 21 positioned at the uppermost side of the ground side element 20 in close proximity. Is preferable.

  Further, it is preferable that the ends of all or a part of the plurality of horizontal filaments 21, 21... Extended from the earth-side feeding point 7 of the earth-side element 20 are connected to form a closed loop.

  Further, when all of the plurality of vertical lines 22, 22... Extended from the ground side feeding point 7 of the ground side element 20 or the tips of some of the vertical lines are connected to form a closed loop, the reception is performed. This is preferable because the sensitivity is further improved. The ground side element 20 extending from the ground side feeding point 7 is provided so as to be close to the vertical side of the opening of the body flange 3.

  The hot-side inner filament 12 of the hot-side element 10 is preferably constituted by a plurality of filaments having different lengths because the resonance frequency band becomes wide.

  A central conductor of the coaxial cable is connected to the hot-side feeding point 6 of the antenna for receiving the terrestrial digital television broadcast wave, and an outer conductor of the coaxial cable is connected to the ground-side feeding point.

  When such a glass antenna for digital terrestrial television broadcasting is provided on either the front window glass or the rear window glass of an automobile, a good reception gain can be obtained by itself, but the front window glass or the rear window Diversity reception can be achieved even if it is a radio wave coming from the side of the vehicle by providing diversity reception in combination with other terrestrial digital television broadcast wave reception antennas on either glass. , Can improve the directivity.

  Of the horizontal and vertical wires on the hot side of the terrestrial digital TV antenna of the present invention, the wire provided in parallel to the window flange 3 is provided at least 5 mm away from the inside of the body flange 3 of each window. Is preferred.

  Furthermore, when the lengths of the horizontal filaments 11a and the vertical filaments 11b of the hot-side closed loop filament 11 of the hot-side element 10 are 50 to 100 mm, the reception state is good and the frequency characteristics are flat. This is preferable.

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

  Further, the antenna pattern of the present invention as described above is created by printing on a transparent resin film or sheet having an adhesive surface with a conductive material, or by attaching a wire or the like, and affixing it to a glass plate surface of an automobile. It can also be done.

The operation of the present invention will be described below.
The reason why the hot-side element 10 connected to the hot-side feeding point 6 is the hot-side closed-loop line 11 having a closed loop shape is to improve the directivity characteristics on the traveling direction side of the automobile.

  The length of one side of the hot-side closed loop strip 11 is preferably 50 to 100 mm because the wavelength of the received radio wave of the terrestrial digital broadcast wave is λ and the wavelength reduction rate of the glass plate is α. In this case, the length becomes a length corresponding to ¼αλ (α: wavelength shortening rate of glass, λ: wavelength of received radio wave), and reception sensitivity is improved.

  The hot side element 10 is provided with an L-shaped line consisting of a horizontal line 12a and a vertical line 12b as the hot side inner line 12, 12 inside the hot side closed loop line 11 of the hot side element 10. If only the closed loop filaments, there is a low reception sensitivity called dip in the directional characteristics in the reception band of the terrestrial digital broadcast wave, so by the horizontal filaments 12a and the vertical filaments 12b of the hot side inner filaments 12 and 12, Sensitivity is improved by adjusting the impedance of the band where the reception sensitivity falls.

  It is the first that the reverse L-shaped auxiliary line consisting of the first horizontal auxiliary line 13 and the first vertical auxiliary line 14 is provided on the outer side of the hot side closed loop line 11 of the hot side element 10. This is because the vertical auxiliary line 14 improves the reception sensitivity of the frequency (470 to 600 MHz) on the low band side of the reception band (470 to 710 MHz) of the terrestrial digital broadcast wave.

  Further, the vertical line is provided on each of the hot side element 10 and the ground side element 20 because the hot side element 10 and the ground side element are apparently point-like when viewed from the side of the automobile. It is not regarded as a short line shape, it becomes a line shape, and sufficient resonance can be obtained for radio waves coming from the lateral direction. This is because the characteristics are sufficient.

  The reason why the hot-side element 10 of the terrestrial digital TV antenna of the present invention is separated from the inside of the opening of the body flange 3 by 5 mm or more is to prevent the influence of the metal body of the automobile. However, if the terrestrial digital TV antenna, its hot feed point 6 and its ground feed point 7 are moved away from the body flange 3 and moved too far to the inside of the glass surface, the AM / FM radio antenna and interference caused by defogger 4 are likely to cause interference, causing new problems such as conspicuous wiring of coaxial cables feeding hot side feed point 6 and ground side feed point 7 It is to do.

  Each example of the present invention will be described below.

[Example 1]
A terrestrial digital TV antenna as shown in FIG. 1 is arranged in the upper margin of the defogger 3 of the rear window glass 1 of the automobile, in the vicinity of the upper side corner of the opening of the body flange 3, An ungrounded terrestrial digital TV antenna composed of two elements of the ground side element 20 is disposed in the lower part.

  The hot-side feeding point 6 and the ground-side feeding point 7 were squares of 12 mm in length and width, respectively, and were provided at positions 10 mm away from the opening side of the body flange. The distance between the hot-side feeding point 6 and the ground-side feeding point 7 was 30 mm.

  The hot side element 10 is provided with a substantially rectangular hot side closed loop line 11 comprising a horizontal line 11a and a vertical line 11b having a length of 80 mm in length and width, passing through the hot side feeding point 6, and further, Two horizontal filaments 12a and 12a having a length of 65 mm and 70 mm are extended in parallel to the inside of the lower side of the hot-side closed loop filament 11 from the feeding point 6, and further, the length is extended upward from the tip of each horizontal filament. It consists of L-shaped hot-side inner filaments 12 and 12 obtained by extending 60 mm and 65 mm vertical filaments 12b and 12b.

  Further, the first horizontal auxiliary line 13 having a length of 80 mm is extended in the horizontal direction from the tip of the horizontal line 11 a on the lower side of the hot-side closed loop line 11, and the length 55 mm is extended by bending downward vertically from the tip. The first vertical auxiliary filament 14 was provided.

  On the other hand, the earth side element 20 has at least two horizontal filaments 21, 21... Extending from the earth side feeding point 7 in the horizontal direction and at least two vertical lines extending from the earth side feeding point 7 in the vertical direction. It consists of wire 22, 22, ..., The space | interval of the horizontal wire located in the lowest line side of the hot side closed loop wire 11 and the horizontal wire located in the uppermost side of the earth | ground side element 20 is 30 mm.

  The window glass plate 1 for automobiles has a substantially trapezoidal shape with an upper side = about 1100 mm, a lower side = about 1250 mm, and a side side = about 700 mm.

  The antenna is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate at a width of 0.7 mm, dried, baked in a heating bending furnace, and further from a tuner (not shown). The central conductor of the extended coaxial cable was connected to the hot-side feeding point 6 and the outer conductor was connected to the grounding-side feeding point 7.

  When the terrestrial digital television broadcast wave receiving antenna of Example 1 created in this way was provided on the rear window glass of the automobile and received as an antenna in the terrestrial digital television broadcast wave band with a frequency of 470 to 710 MHz, the solid line in FIG. Good frequency characteristics shown in FIG. 8 are obtained, and a significant improvement is seen in the band of 470 to 620 MHz and the band of 650 to 710 MHz as compared with the antenna of Comparative Example 1 described later shown in FIG. It can be seen that a sufficiently good reception sensitivity can be obtained by itself.

  The frequency characteristic indicated by the dotted line in FIG. 9 is based on the antenna pattern of the comparative example 1 shown in FIG. 8 and has a configuration in which the hot-side element 10 does not have a rectangular closed loop line.

  Further, the directional characteristic diagram shown by the solid line in FIG. 10 is a case where the hot side first vertical filament 12 of the hot side element 10 shown in Example 1 of FIG. 1 is present, and the directional characteristic diagram shown by the dotted line is 8 is a case where the hot-side element 10 shown in Comparative Example 1 in FIG. 8 does not have a rectangular closed loop filament, and as can be seen from FIGS. 9 and 10, the antenna pattern of the present invention shown in FIG. However, it can be seen that both the frequency characteristic and the directivity are superior to the pattern of Comparative Example 1 shown in FIG.

[Example 2]
The second embodiment shown in FIG. 2 differs from the first embodiment shown in FIG. 1 in that both the hot-side element 10 and the ground-side element 20 are different from each other. The horizontal filaments on the uppermost side of the side element 20 are adjacently capacitively coupled.

  That is, the two horizontal filaments 12a and 12a are extended in the horizontal direction inside the hot-side closed loop filament 11 from the hot-side feeding point 6, and the vertical filaments 12b and 12b are further extended in the vertical direction from their respective tip portions. The point at which the hot-side inner filaments 12, 12 are provided, and the distance between the hot-side feeding point 6 and the ground-side feeding point 7 is 30 mm, the same as in the first embodiment.

  On the other hand, the rectangular hot-side feeding point 6 is arranged so as to circumscribe the middle of the left side of the substantially saddle-shaped hot-side closed loop strip 11, and the vertical strip of the hot-side closed loop strip 11. A point where the second vertical auxiliary line 15 is extended in the vertical direction from the hot-side feeding point 6 in parallel to the outside of the hot-side feeding point 6, and the vertical side of the hot-side closed-loop line 11 on the side away from the hot-side feeding point 6 The point which provided the two 1st horizontal auxiliary filaments 13 and 13 branched from the filament 11b and extended in the outside direction, and also the tip parts of the two horizontal filaments 21 and 21 of the earth side element, And the point where the tips of the two vertical filaments 22 and 22 are connected to each other, the length of the horizontal filament of the hot-side closed loop filament 11 is 80 mm, and the length of the vertical filament 11b is 100 mm. A long rectangular shape with its lower side Horizontal strip 11a is point so as to capacitively coupled by proximity to horizontal strip 21 of the ground-side element 20 is different.

  The antenna is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 1 with a width of 0.7 mm, dried, and baked in a heating bending furnace. Further, the central conductor of the coaxial cable extended from a tuner (not shown) was connected to the hot-side feeding point 6 and the outer conductor was connected to the grounding-side feeding point 7.

  When the terrestrial digital TV broadcast wave antenna of Example 2 created in this way was provided on the rear window glass of an automobile and received as an antenna for a terrestrial digital TV broadcast wave band with a frequency of 470 to 710 MHz, Similarly, satisfactory reception sensitivity was obtained, which was sufficiently practical.

[Example 3]
The third embodiment shown in FIG. 3 differs from the second embodiment shown in FIG. 2 in the hot side element 10 and the ground side element 20 is the same. Further, the horizontal line on the lowermost side of the hot side element 10 and the horizontal line on the uppermost side of the ground side element 20 are close to each other and are the same as in the second embodiment.

  In other words, the rectangular hot-side feeding point 6 is arranged so as to be inscribed in the middle of the inner side of the left side of the bowl-shaped hot-side closed loop strip 11. On the outside of the vertical line 11b of the hot side closed loop line 11 is a second vertical auxiliary line extending from the hot side feed point 6 in the vertical direction. The point which does not provide the filament 15 is different from Example 2 shown in FIG.

  On the other hand, two first horizontal auxiliary wires 13, 13 that branch from the vertical wire 11 b on the side away from the hot-side feeding point 6 of the hot-side closed loop wire 11 and extend outward are provided. This is the same as in the second embodiment shown in FIG.

  The antenna is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 2 with a width of 0.7 mm, dried, and baked in a heating bending furnace. Further, the central conductor of the coaxial cable extended from a tuner (not shown) was connected to the hot-side feeding point 6 and the outer conductor was connected to the grounding-side feeding point 7.

  When the terrestrial digital television broadcast wave antenna of Example 3 created in this way was provided on the rear window glass of an automobile and received as an antenna of a terrestrial digital TV broadcast wave band with a frequency of 470 to 710 MHz, it was the same as in Example 2. The reception sensitivity was satisfactory, and it was sufficiently practical.

[Example 4]
4 differs from the third embodiment shown in FIG. 3 in the hot side element 10 and the ground side element 20 is the same. In addition, the horizontal line on the lowermost side of the hot-side closed loop line 11 of the hot-side element 10 and the horizontal line on the uppermost side of the ground-side element 20 are separated by 30 mm, and there is no capacitive coupling. Different from 3.

  That is, the rectangular hot-side feeding point 6 is arranged so as to be inscribed in the lower left corner of the bowl-shaped hot-side closed loop strip 11, but the length of the horizontal strip 11 a of the hot-side closed loop strip 11 is long. Compared with 100 mm, the length of the vertical line 11 b is a horizontally long rectangle of 80 mm, and the hot-side inner line provided inside the hot-side closed-loop line 11 is perpendicular to the hot-side feeding point 6. The point which provided horizontal line 12a, 12a in each front-end | tip part of two extended vertical lines 12b, 12b, and also the vertical line 11b of the side away from the hot side feeding point 6 of the hot side closed loop line 11 Example 3 shown in FIG. 3 is that only one L-shaped auxiliary line consisting of a first horizontal auxiliary line 13 and a first vertical auxiliary line 14 which are further branched and extended outward is provided. Is different.

  The antenna is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 1 with a width of 0.7 mm, dried, and baked in a heating bending furnace. Further, the central conductor of the coaxial cable extended from a tuner (not shown) was connected to the hot-side feeding point 6 and the outer conductor was connected to the grounding-side feeding point 7.

  When the terrestrial digital television broadcast wave antenna of Example 4 created in this way was provided on the rear window glass of an automobile and received as an antenna of a terrestrial digital TV broadcast wave band with a frequency of 470 to 710 MHz, it was the same as in Example 1. The reception sensitivity was satisfactory, and it was sufficiently practical.

[Example 5]
In the fifth embodiment shown in FIG. 5, both the hot side element 10 and the ground side element 20 are different from the first embodiment shown in FIG. The ground side element 20 is the same as that of the second embodiment shown in FIG.

  That is, the hot side element 10 is arranged such that the rectangular hot side feeding point 6 circumscribes the lower left portion of the rectangular hot side closed loop wire 11, and the hot side feeding point 6 is connected to the hot side. Inside the closed-loop filament 11, two horizontal filaments 12a, 12a are extended in the horizontal direction, and further, hot-side inner filaments 12, 12 are provided in which the vertical filaments 12b, 12b are extended in the vertical direction from their respective tips. In addition, the horizontal line 13a extends in the horizontal direction from the tip of the horizontal line 11a on the lower side of the hot-side closed loop line 11 and is further provided with a vertical line 13b that is bent and extended vertically downward from the tip. This is consistent with the first embodiment shown in FIG.

  On the other hand, the second vertical auxiliary line 15 extends from the hot side feed point 6 in the vertical direction outside the vertical line 11b of the hot side closed loop line 11 in parallel, and the lower side of the hot side closed loop line 11 The second horizontal auxiliary line 16 is extended through a lead line that extends in the vertical direction from the middle of the horizontal line 11a on the side, and the tips of the two horizontal lines 21 and 21 of the ground element The point which connected each other and the front-end | tip parts of the two perpendicular | vertical linear strips 22 and 22 is different from Example 1 shown in FIG.

  On the other hand, the second horizontal auxiliary line 16 that is the horizontal line on the lowermost side of the hot side element 10 and the horizontal line on the uppermost side of the ground side element 20 are close and capacitively coupled. It differs from Example 1 shown in FIG.

  The antenna is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 1 with a width of 0.7 mm, dried, and baked in a heating bending furnace. Further, the central conductor of the coaxial cable extended from a tuner (not shown) was connected to the hot-side feeding point 6 and the outer conductor was connected to the grounding-side feeding point 7.

  When the terrestrial digital TV broadcast wave antenna of Example 5 created in this way was provided on the rear window glass of the automobile and received as an antenna in the terrestrial digital TV broadcast wave band with a frequency of 470 to 710 MHz, it was the same as in Example 1. The reception sensitivity was satisfactory, and it was sufficiently practical.

[Example 6]
In the sixth embodiment shown in FIG. 6, both the hot side element 10 and the ground side element 20 are different from the first embodiment shown in FIG.

  The hot side element 10 is outside the vertical line 11b of the hot side closed loop line 11 and in parallel to the second vertical auxiliary line 15 extending from the hot side feeding point 6 in the vertical direction, This is the same as the first embodiment shown in FIG.

  On the other hand, the ground side element 20 is different in that there are three ground side first horizontal filaments and three ground side first vertical filaments respectively extending in the horizontal and vertical directions from the square ground side feeding point 7. .

  The antenna is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate in the same manner as in Example 1 with a width of 0.7 mm, dried, and baked in a heating bending furnace. Further, the central conductor of the coaxial cable extended from a tuner (not shown) was connected to the hot-side feeding point 6 and the outer conductor was connected to the grounding-side feeding point 7.

  When the terrestrial digital TV broadcast wave antenna of Example 6 created in this way was provided on the rear window glass of the automobile and received as an antenna in the terrestrial digital TV broadcast wave band with a frequency of 470 to 710 MHz, it was the same as in Example 1. The reception sensitivity was satisfactory, and it was sufficiently practical.

[Example 7]
In Example 7 shown in FIG. 7, the antenna pattern of Example 1 is provided in two left and right systems in the upper margin of the defogger 4 of the rear window glass for an automobile. That is, in this example, one antenna is disposed at each of the left and right corners on the upper side of the opening of the body flange, and diversity reception is performed by the two antennas provided on the left and right.

  As in Examples 1 to 6, the antenna is printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate with a width of 0.7 mm, dried, and then baked in a heating bending furnace. Furthermore, when connecting each of the two coaxial cables extended from the tuner (not shown) by the diversity circuit to each of the two antennas, the central conductors of the coaxial cables are connected to the two hot feeding points 6 and 6 on the hot sides. In addition, the outer conductor was also connected to feeding points 7 and 7 on each of the two ground sides.

  The two antennas for digital terrestrial television broadcast waves of Example 7 created in this way are diversity-received and received as antennas in the terrestrial digital television broadcast wave band of frequency 470 to 710 MHz. Compared with the case of receiving with, the directional characteristics can be complemented with each other to obtain more excellent directional characteristics, and the reception rate can be improved.

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

[Comparative Example 1]
The comparative example 1 shown in FIG. 8 is the hot-side element 10 of the first embodiment shown in FIG. 1, and the tip of one horizontal filament on the upper side of two horizontal filaments extending in the horizontal direction from the hot-side feeding point 6. One of the two vertical lines extending in the vertical direction from the hot-side feeding point 6 is closer to the direction in which the horizontal line is extended. It consists of two filaments extending in the same direction as the horizontal filaments from the tip of the vertical filaments to form L-shaped filaments, and each filament does not cross each other and does not have a closed loop filament.

  On the other hand, the ground side element 20 has the same pattern as the ground side element 20 of the first embodiment shown in FIG.

  As in Example 1, the antenna of Comparative Example 1 was printed with a conductive ceramic paste at a predetermined position on the indoor surface side of the window glass plate at a width of 0.7 mm, dried, and then heated and heated in a furnace. Further, the central conductor of the coaxial cable extended from a tuner (not shown) was connected to the hot-side feeding point 6 and the outer conductor was connected to the grounding-side feeding point 7.

  When the terrestrial digital TV broadcast wave antenna of Comparative Example 1 created in this way was provided on the rear window glass of the automobile and received as an antenna of the terrestrial digital TV broadcast wave band with a frequency of 470 to 710 MHz, the dotted line in FIG. The frequency characteristics as shown and the directivity characteristics as shown by the dotted line in FIG.

  By making the hot side element 10 of the comparative example 1 into a pattern as shown in the embodiment 1 of FIG. 1, the frequency characteristic is improved as shown by the solid line from the dotted line of FIG. 9, and the directivity is also a dotted line of FIG. As can be seen from FIG.

DESCRIPTION OF SYMBOLS 1 Window glass 2 Ceramic paste layer 3 Body flange 4 Defogger 6 Hot side feeding point 7 Ground side feeding point 10 Hot side element 11 Hot side closed loop strip 12 Hot side inner strip 13 First horizontal auxiliary strip 14 First vertical auxiliary Line 15 Second horizontal auxiliary line 16 Second vertical auxiliary line 20 Ground side element 21 Horizontal line 22 Vertical line

Claims (9)

In the antenna for terrestrial digital television broadcast waves provided on the window glass surface of an automobile, a hot-side feeding point is provided in the vicinity of the vertical side of the opening of the flange of the window, and a ground-side feeding point is provided in the vicinity thereof.
Passing through the hot-side feeding point, a hot-side closed-loop line consisting of a horizontal line and a vertical line,
A hot-side element comprising: at least one hot-side inner line extending from the hot-side feeding point into the hot-side closed-loop line and having an L shape by a horizontal line and a vertical line;
It is characterized by comprising at least two horizontal filaments extending in the horizontal direction from the ground-side feeding point, and an earth-side element comprising at least two vertical filaments extending in the vertical direction from the ground-side feeding point 7 as well. A glass antenna for a vehicle. Extending at least one first horizontal auxiliary line that branches in the horizontal direction outside the vertical line located on the side away from the hot side feeding point of the hot side closed loop line, 2. The glass antenna for a vehicle according to claim 1, wherein the first vertical auxiliary filament is extended by bending from at least one tip. 3. The second horizontal auxiliary filament is extended through a lead line that branches and extends in the vertical direction from the middle of the horizontal filament on the lower side of the hot-side closed loop filament. 3. Vehicle glass antenna. The glass antenna for a vehicle according to any one of claims 1 to 3, wherein a second vertical auxiliary wire is provided from a hot-side feeding point at a position outside the hot-side closed loop wire. 5. The capacitive element according to claim 1, wherein the horizontal line portion at the lowermost position of the hot side element and the horizontal line portion at the uppermost position of the ground side element are capacitively coupled in close proximity. Vehicle glass antenna. The vehicle according to any one of claims 1 to 5, wherein the ends of all or some of the plurality of horizontal wires extending from the earth-side feeding point of the earth-side element are connected to form a closed loop. Glass antenna. 7. The plurality of all or a part of vertical wires extending from the ground side feeding point of the ground side element are connected to each other to form a closed loop. Glass antenna for vehicles. 8. The coaxial cable center conductor is connected to the hot-side feeding point of the antenna for terrestrial digital television broadcasting, and the outer conductor of the coaxial cable is connected to the ground-side feeding point. A glass antenna for a vehicle according to claim 1. 2. The glass antenna according to claim 1, wherein a plurality of the glass antennas are provided in any one of a front window glass and a rear window glass of an automobile, or are combined with other antennas for receiving digital terrestrial television broadcast waves to receive diversity. The glass antenna for vehicles in any one of thru | or 8.

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