JP6540782B2 - Glass antenna - Google Patents

Description

  The present invention relates to a glass antenna, and more particularly to a glass antenna disposed in a window glass for a vehicle.

  In vehicles, such as a car, a conductor wire is printed on a back window glass, it uses as an antenna, and a glass antenna which receives FM radio broadcasting etc. is known. As a glass antenna, it has an antenna consisting of a conductor line printed on a rear window glass, and a feed terminal connected to the antenna and connected to a receiver via an antenna amplifier, and the feed terminal has an FM radio broadcast It is known to connect two antennas for receiving digital radio broadcasting (DAB).

  For example, in Patent Document 1, a first element and a second element are connected to a feed terminal connected to an antenna amplifier, and a second element is folded back from a main body extending from the feed terminal and an end of the main body A glass antenna is disclosed which has a folded portion disposed along the main body and receives an FM radio broadcast and a digital radio broadcast.

JP, 2015-142162, A

  When an FM / digital radio combined antenna that combines an FM antenna set to receive FM radio broadcast and a digital radio antenna set to receive digital radio broadcast is disposed on the rear window glass, FM / digital In some cases, a feeding terminal is directly connected to the radio combined antenna, and radio waves received by the FM / digital radio combined antenna are transmitted from the feeding terminal to the receiver via the antenna amplifier.

  As shown in FIG. 5, a glass antenna 110 disposed on the rear window glass 101 has an FM / digital radio combined antenna 120 set to receive an FM radio broadcast and a digital radio broadcast, and an FM / digital radio. The feed terminal 130 is directly connected to the dual purpose antenna 120, and the radio wave received by the FM / digital radio dual purpose antenna 120 is transmitted from the feed terminal 130 to the receiver (not shown) via the antenna connection line 111, the antenna amplifier 112 and the coaxial cable 113. Sometimes.

  As described above, by directly connecting the feeding terminal to the FM / digital radio combined antenna, the number of parts can be reduced by sharing the feeding terminal of the FM antenna and the digital radio antenna while well receiving FM radio broadcasting and digital radio broadcasting. It is possible.

  However, when the feed terminal connected to the FM / digital radio combined antenna is attached from the vehicle compartment side to the feed terminal base portion exposed in the vehicle interior formed by printing the conductive silver paste on the rear window glass, Since the terminals are exposed to the passenger compartment, the occupant of the rear seat may come in contact with the power supply terminals and damage the power supply terminals.

  On the other hand, it is thought that damage to the feed terminal can be suppressed by providing a cover member that covers the feed terminal from the cabin side, but the occupant of the rear seat still contacts the feed terminal and the feed terminal And the cover member may cause an increase in the number of parts and the number of assembling steps.

  Then, this invention makes it a subject to provide the glass antenna which can prevent that a feed terminal is damaged while ensuring the receiving sensitivity of FM antenna and a digital radio antenna favorably, sharing a feed terminal.

  In order to solve the above-mentioned subject, the present invention is characterized by having constituted as follows.

  First, an invention according to claim 1 of the present invention is a glass antenna disposed on a window glass for a vehicle, wherein an FM radio disposed on the window glass for a vehicle and having a center frequency of a first wavelength FM combining FM antenna set to receive high frequency signals in broadcast band and digital radio antenna set to receive high frequency signals in digital radio broadcast band whose center wavelength is the second wavelength A digital radio combined antenna, a first conductor wire at least a part of which is disposed on the window glass of the vehicle and having a length set based on a half length of the second wavelength, and the vehicle Having a length disposed on a window glass and connected to one end of the first conductor wire and set based on a quarter length of the second wavelength, and the FM digital Radio combination a And a feed terminal connected to the other end side of the first conductor wire, the second conductor wire being disposed in proximity to the FM / digital radio combined antenna so as to capacitively couple with the antenna; The terminal is disposed on the outer side in the vehicle width direction of the window glass for a vehicle covered by a rear pillar cover.

  In the invention according to claim 2, in the invention according to claim 1, a length of a portion of the first conductor wire disposed on the window glass for vehicle is half of the second wavelength. The second conductor wire is provided to have a length obtained by multiplying the glass shortening rate by the length obtained by subtracting the length of the portion not disposed on the window glass from the length within one predetermined range. The length of the portion disposed on the window glass has a length obtained by multiplying the length within a predetermined range of a quarter of the second wavelength by the glass shortening rate. It is characterized by

  In the invention according to claim 3, in the invention according to claim 1 or 2, the FM / digital radio combined antenna is provided on both sides in the vehicle width direction of the window glass for a vehicle. It is characterized by

  In the invention according to claim 4, in the invention according to any one of claims 1 to 3, a high frequency signal of an AM radio broadcast band on the inner side in the vehicle width direction of the window glass for a vehicle , And the AM antenna is connected to the second conductor line.

  According to the invention described in claim 1 of the present application, the glass antenna is an FM antenna for receiving high frequency signals in the FM radio broadcast band and the digital radio broadcast band in which the wavelength of the center frequency is the first and second wavelengths; An FM / digital radio combined antenna that doubles as an antenna, and a first conductor wire having a length at least a part of which is set on a window glass for a vehicle and set based on a half length of a second wavelength And a length connected to one end of the first conductor wire disposed on the window glass for the vehicle and set based on a quarter length of the second wavelength, and FM and digital The power supply terminal is covered by the rear pillar cover, including a second conductor wire disposed in proximity to be capacitively coupled to the radio antenna and a power supply terminal connected to the other end of the first conductor wire. Window glass for vehicles It is arranged in the vehicle width direction outer side.

  As a result, the feed terminal is not covered by the rear pillar cover and is not exposed to the vehicle interior. Therefore, the passenger of the rear seat contacts the feed terminal without damaging the feed terminal without providing a separate cover member for covering the feed terminal. Can be prevented.

  The first conductor wire connected to the feeding terminal is capacitively coupled to the FM / digital radio combined antenna via the second conductor wire, thereby making it possible to set the impedance in the FM radio broadcast band to four of the first wavelength of the first conductor wire. The inductive reactance due to the inductance based on the difference in length with a part can be canceled by the capacitive reactance due to the capacitance of the capacitive coupling between the FM / digital radio combined antenna and the second conductor wire, so that the FM / digital radio combined It is possible to suppress the decrease in the reception sensitivity of the FM antenna in the antenna, and the reception sensitivity of the FM antenna can be favorably secured.

  In addition, the first conductor line has a length set based on a quarter length of the second wavelength, and is disposed on the second conductor line disposed in proximity to the FM / digital radio combined antenna. By being connected, it can be regarded as a configuration in which one end of the first conductor wire is directly connected to the FM / digital radio combined antenna, and the first conductor wire has a half length of the second wavelength. Since the reception sensitivity of the digital radio antenna can be made almost equal at one end and the other end of the first conductor wire by having the length set based on the digital radio antenna in the FM / digital radio combined antenna It is possible to suppress the decrease in the reception sensitivity of the digital radio antenna, and the reception sensitivity of the digital radio antenna can be favorably secured.

  Therefore, in the glass antenna, while sharing the feed terminals of the FM antenna and the digital radio antenna, the reception sensitivity of the FM antenna and the digital radio antenna can be favorably secured and the damage of the feed terminal can be prevented.

  According to the second aspect of the present invention, the first conductor wire has a length of a portion disposed on the window glass for a vehicle from a length within a predetermined range of one half of the second wavelength. The second conductor wire is provided so as to have a length obtained by multiplying the glass shortening rate by the length obtained by reducing the length of the portion not provided on the window glass, and the second conductor wire is provided for the portion provided on the window glass The above effect can be specifically realized by providing the length obtained by multiplying the length within a predetermined range of a quarter of the second wavelength by the glass shortening rate.

  Further, according to the invention described in claim 3, the FM / digital radio combined antenna can be diversified as the FM / digital radio combined antenna is provided by being respectively provided on both sides in the vehicle width direction of the window glass for a vehicle. , And can improve the reception sensitivity of the FM antenna and the digital radio antenna.

  Further, according to the invention of claim 4, the AM connected to the second conductor wire is set to receive the high frequency signal of the AM radio broadcast band on the inner side in the vehicle width direction of the window glass for a vehicle By providing the antenna, it is possible to share the feed terminal with the FM antenna and the digital radio antenna also for the AM antenna.

It is a figure showing composition of a glass antenna concerning an embodiment of the present invention. It is a principal part enlarged view of the glass antenna shown in FIG. It is a graph which shows the frequency characteristic in the digital radio broadcast zone of a glass antenna. It is a graph which shows the frequency characteristic in the FM radio broadcast band of a glass antenna. It is a figure which shows the structure of the conventional glass antenna.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

  FIG. 1 is a view showing the configuration of a glass antenna according to an embodiment of the present invention. The glass antenna 10 which concerns on embodiment of this invention is arrange | positioned by the rear window glass 1 as a window glass for vehicles, as shown in FIG. FIG. 1 shows the glass antenna 10 disposed on the rear window glass 1 as viewed from the vehicle compartment side, and the peripheral edge portion of the rear window glass 1 omits the flange portion of the vehicle body component attached from the vehicle rear side. Is shown.

  The glass antenna 10 is an FM / digital radio combined antenna 20 which shares an FM antenna and a digital radio antenna on the left side of the vehicle which is the upper side of the rear window glass 1 and one side in the vehicle width direction, and at least a part of the rear window A first conductor wire 30 disposed on the glass 1 and provided correspondingly to the FM / digital radio antenna 20 and an end of the first conductor wire 30 disposed on the rear window glass 1 and connected to the FM · A second conductor wire 40 disposed in the vicinity of the FM / digital radio antenna 20 so as to capacitively couple with the digital radio antenna 20, and a feeding terminal 45 connected to the other end of the first conductor wire 30 Is equipped. The FM / digital radio combined antenna 20, the first conductor wire 30, and the second conductor wire 40 disposed on the rear window glass 1 are each formed by printing a conductive wire made of conductive silver paste on the rear window glass 1. ing.

  FIG. 2 is an enlarged view of a main part of the glass antenna shown in FIG. In the present embodiment, the FM / digital radio combined antenna 20 has an 88 to 108 MHz FM radio broadcast band whose center frequency is 98 MHz so as to receive a high frequency signal of the FM radio broadcast band whose center frequency is the first wavelength. And an FM antenna set to receive an FM radio broadcast of the second embodiment, and the central frequency of the present embodiment is 205 MHz so as to receive a high frequency signal of the digital radio broadcast band in which the wavelength of the central frequency is the second wavelength 170. It is also used as a digital radio antenna set to receive a digital radio broadcast of a digital radio broadcast band of -240 MHz.

  As shown in FIG. 2, the FM / digital radio combined antenna 20 is disposed at a plurality of horizontal portions extending in parallel in the horizontal direction in the vehicle width direction, specifically, a first horizontal side separated by a predetermined distance in order from the upper side. Ends of the left side and the right side of the vehicle 21, the second horizontal portion 22, the third horizontal portion 23, the fourth horizontal portion 24 and the fifth horizontal portion 25, and the plurality of horizontal portions 21, 22, 23, 24, 25 Are connected to each other, and are provided with a first vertical portion 26 and a second vertical portion 27 extending in the vertical direction.

  In the glass antenna 10, the length L1 of the first horizontal portion 21, the second horizontal portion 22, the third horizontal portion 23, the fourth horizontal portion 24 and the fifth horizontal portion 25 is set to 150 mm, and the first horizontal portion 21 and The distance L2 of the second horizontal portion 22, the distance L3 of the second horizontal portion 22 and the third horizontal portion 23, the distance L4 of the third horizontal portion 23 and the fourth horizontal portion 24, and the fourth horizontal portion 24 and the fifth horizontal portion 25 The distance L5 is set to 30 mm, and the length L6 of the first vertical portion 26 and the second vertical portion 27 is set to 120 mm.

  1 and 2, the rear pillar cover 2 covers the vehicle width direction outer side of the rear window glass 1 from the vehicle compartment side, and the roof lining 3 covers the vehicle body upper side of the rear window glass 1 from the vehicle compartment side. It is shown by a dashed line. The feed terminal 45 for the FM / digital radio combined antenna 20 is disposed on the outer side in the vehicle width direction of the rear window glass 1 covered by the rear pillar cover 2 and attached to the vehicle compartment side of the rear window glass 1. The feed terminal 45 is also disposed on the center side of the rear window glass 1 with respect to the inner edge portion of the flange portion 4 of the vehicle body component to which the rear window glass 1 is attached.

  The feed terminal 45 is attached to the feed terminal base portion 30 a provided on the other end side of the first conductor wire 30 and exposed in the vehicle compartment from the vehicle compartment side. The conductive silver paste is printed on the rear window glass 1 also for the power supply terminal base portion 30a. The feed terminal 45 is provided at a position overlapping the fourth horizontal portion 24 of the FM / digital radio combined antenna 20 in the top-bottom direction.

  As described above, the power supply terminal 45 is disposed on the outer side in the vehicle width direction of the rear window glass 1 covered by the rear pillar cover 2 and thus is not exposed in the vehicle compartment. It is possible to prevent the feeding terminal 45 from being damaged by the occupant of the rear seat contacting the feeding terminal 45 without separately providing the

  When the rear pillar cover 2 is attached to the rear window glass 1 to which the roof lining 3 is attached, the feed terminal 45 can be attached before the rear pillar cover 2 is attached to the rear window glass 1. Can be prevented from being damaged.

  The feed terminal 45 is connected to the antenna amplifier 12 via the antenna connection line 11 that functions as the first conductor line 30 without being disposed in the rear window glass 1, and is connected to a receiver (not shown) to the antenna amplifier 12. The coaxial cable 13 is connected so that the radio wave received by the FM / digital radio combined antenna 20 can be amplified from the feeding terminal 45 to the receiver by the antenna amplifier 12 and transmitted. The antenna amplifier 12 is earth-fixed to the rear pillar of the vehicle.

  The first conductor wire 30 disposed in the rear window glass 1 is disposed at a position spaced a predetermined distance upward from the upper end of the second vertical portion 27 of the FM / digital radio antenna 20 at one end, and the other end The unit is connected to the feed terminal 45. In the glass antenna 10, the distance L7 between one end of the first conductor wire 30 and the second vertical portion 27 of the FM / digital radio antenna 20 is set to 15 mm.

  The first conductor line 30 is formed to have a length set based on a half length of the second wavelength which is a wavelength of the center frequency of the digital radio broadcast band, and disposed on the rear window glass 1 The sum of the length of the first conductor wire 30 divided by the glass shortening rate α of the rear window glass 1 and the length of the antenna connection wire 11 to be within a predetermined range of one half of the second wavelength It is formed. The length of the antenna connection line 11 is set near 150 mm to ensure ease of assembly. In the rear window glass 1, the glass shortening ratio α is set to 0.7.

  Specifically, the length of the first conductor wire 30 is within a predetermined range, for example, ± 20% with respect to a half length of the second wavelength, which is a wavelength of the center frequency of the digital radio broadcast band of 170 to 240 MHz. The internal length is set. The predetermined range is set such that, for example, in the frequency characteristics of the digital radio broadcast band of 170 to 240 MHz, an average reception sensitivity equal to or higher than a predetermined reception sensitivity near -10 dB in ratio to the dipole antenna is obtained. .

  The first conductor line 30 is also formed to have a length near the quarter length of the first wavelength, which is a wavelength of the center frequency of the 88 to 108 MHz FM radio broadcast band, The sum of the length obtained by dividing the length of the first conductor wire 30 disposed by the glass shortening ratio α of the rear window glass 1 and the length of the antenna connection wire 11 is in the vicinity of a quarter length of the first wavelength It will be formed to have a length.

  The first conductor wire 30 disposed in the rear window glass 1 has a first vertical portion 31 extending upward from one end, and a first horizontal portion extending substantially horizontally from the upper end of the first vertical portion 31 to the left side of the vehicle And a second vertical portion 33 which extends downward from the left side of the vehicle of the first horizontal portion 32 and is connected to the feed terminal 45.

  Then, the sum of the lengths of the first vertical portion 31, the first horizontal portion 32, and the second vertical portion 33 divided by the glass shortening ratio α of the rear window glass 1 and the sum of the lengths of the antenna connection lines 11 are It is formed to be within a predetermined range of half of the second wavelength which is the wavelength of the center frequency of the digital radio broadcast band of 170 to 240 MHz. The first conductor wire 30 is not disposed on the vehicle window glass 1 because the length of the portion disposed on the vehicle window glass 1 is within a predetermined range of half the second wavelength. It is provided to have a length obtained by multiplying the glass shortening rate α by the length obtained by reducing the length of

  In the glass antenna 10, the length L8 of the first vertical portion 31 is set to 15 mm, the sum of the lengths of the first horizontal portion 32 and the second vertical portion 33 is set to 340 mm, and the rear window glass 1 is disposed. The length of the first conductor wire 30 is set to 355 mm, and the length of the antenna connection wire 11 is set to 150 mm.

  The second conductor wire 40 is disposed adjacent to the FM / digital radio antenna 20 at a predetermined distance away from the one end portion P1 of the first conductor wire 30 so as to capacitively couple with the FM / digital radio antenna 20. A first horizontal portion 41 extending horizontally in parallel along the first horizontal portion 21 of the FM / digital radio antenna 20 on the left side of the vehicle and a first horizontal portion extending downward from the end of the first horizontal portion 41 on the left side of the vehicle A vertical portion 42 and a second horizontal portion 43 horizontally extending in parallel along the first horizontal portion 21 of the FM / digital radio antenna 20 on the right side of the vehicle from the lower end of the first vertical portion 42 are provided.

  In the glass antenna 10, the distances L9 and L10 of the first horizontal part 41 and the second horizontal part 43 of the second conductor wire 40 and the first horizontal part 21 of the FM / digital radio antenna 20 are set to 5 mm and 15 mm, respectively. There is. In the second conductor wire 40, the distance L11 between the first horizontal portion 41 and the inner edge (see the broken line in FIG. 2) of the flange 4 of the vehicle body component formed of metal such as steel plate is set to 20 mm. And capacitive coupling.

  The second conductor line 40 is formed to have a length set based on a quarter length of the second wavelength, which is a wavelength of the center frequency of the digital radio broadcast band of 170 to 240 MHz, and the rear window The length of the second conductor wire 40 disposed on the glass 1 divided by the glass shortening ratio α of the rear window glass 1 is formed to be within a predetermined range of 1⁄4 of the second wavelength There is.

  Specifically, the length of the second conductor wire 40 is specifically the length obtained by dividing the length of the second conductor wire 40 disposed in the rear window glass 1 by the glass shortening ratio α of the rear window glass 1 Is set to a length within a predetermined range, for example, ± 20% with respect to a length of a quarter of the second wavelength which is a wavelength of the center frequency of the digital radio broadcast band of 170 to 240 MHz. In the glass antenna 10, the length L12 of the first horizontal portion 41 and the second horizontal portion 43 is set to 150 mm, the length L13 of the first vertical portion 42 is set to 10 mm, and the rear window glass 1 is disposed. The length of the second conductor wire 40 is set to 310 mm. The predetermined range is set such that, for example, in the frequency characteristics of the digital radio broadcast band of 170 to 240 MHz, an average reception sensitivity equal to or higher than a predetermined reception sensitivity near -10 dB in ratio to the dipole antenna is obtained. .

  In the present embodiment, the glass antenna 10 was examined for frequency characteristics in the digital radio broadcast band and the FM radio broadcast band.

  FIG. 3 is a graph showing the frequency characteristics of the glass antenna in the digital radio broadcast band. In FIG. 3, the frequency of the digital radio broadcast band is plotted on the horizontal axis, and the reception sensitivity to the frequency of the digital radio broadcast band is plotted on the vertical axis. The reception sensitivity on the vertical axis indicates that the smaller the negative value, that is, the larger the reception sensitivity, the better the reception sensitivity. The reception sensitivity indicates the reception sensitivity before being amplified by the antenna amplifier 12 and is shown as a ratio to the dipole antenna. Although FIG. 3 shows the reception sensitivity measured through the power supply terminal 45 on the left side of the vehicle, the same characteristic applies to the reception sensitivity measured through the power supply terminal 75 on the right side of the vehicle described later. .

  As shown in FIG. 3, in the glass antenna 10, although the reception sensitivity at the frequencies near 174 to 180 MHz and 194 to 202 MHz is lower than the reception sensitivity at other frequencies, the average reception over the entire frequency of the digital radio broadcast band It can be seen that the sensitivity can be made to be equal to or higher than the predetermined reception sensitivity in the vicinity of -10 dB, and good reception sensitivity can be obtained.

  FIG. 4 is a graph showing the frequency characteristics of the glass antenna in the FM radio broadcast band. In FIG. 4, the frequency of the FM radio broadcast band is plotted on the horizontal axis, and the reception sensitivity to the frequency of the FM radio broadcast band is plotted on the vertical axis. The reception sensitivity on the vertical axis indicates that the smaller the negative value, that is, the larger the reception sensitivity, the better the reception sensitivity. The reception sensitivity indicates the reception sensitivity before being amplified by the antenna amplifier 12 and is shown as a ratio to the dipole antenna. Although FIG. 4 shows the reception sensitivity measured via the power supply terminal 45 on the left side of the vehicle, the same characteristic applies to the reception sensitivity measured via the power supply terminal 75 on the right side of the vehicle described later.

  As shown in FIG. 4, in the glass antenna 10, although the reception sensitivity at a frequency near 88 to 93 MHz is lower than the reception sensitivity at other frequencies, the average reception sensitivity of the entire frequency in the FM radio broadcast band is around -10 dB It can be seen that it can be made to be equal to or higher than the predetermined reception sensitivity of the above, and good reception sensitivity can be obtained.

  Here, the reception performance of the digital radio broadcast band of the glass antenna and the FM radio broadcast band will be described.

  In the glass antenna 10, as shown in FIG. 2, the second conductor wire 40 connected to one end P1 of the first conductor wire 30 is a quarter of the second wavelength which is the wavelength of the center frequency of the digital radio broadcast band. By having the length set based on one length and disposed close to the FM / digital radio combined antenna 20, the first conductor of the FM / digital radio combined antenna 20 for the digital radio broadcast band It can be considered that one end P1 of the wire 30 is directly connected.

  In addition, one end of the first conductor wire 30 has a length set based on a half length of the second wavelength, which is the wavelength of the center frequency of the digital radio broadcast band, by the first conductor wire 30. The reception sensitivity of the digital radio antenna can be made approximately equal between the part P1 and the other end P2.

  Therefore, in the glass antenna 10, it is possible to suppress the decrease in the reception sensitivity of the digital radio antenna in the FM / digital radio combined antenna 20 in the digital radio broadcast band, and ensure the reception sensitivity of the digital radio antenna favorably. Can.

  Also, in the glass antenna 10, the first conductor wire 30 connected to the feed terminal 45 is formed to have a length near the quarter length of the first wavelength which is the wavelength of the center frequency of the FM radio broadcast band. Thus, one end P 1 of the first conductor wire 30 is capacitively coupled to the FM / digital radio antenna 20 via the second conductor wire 40.

  Thereby, the inductive reactance due to the inductance based on the difference in the length of the first wavelength of the first conductor wire 30 with respect to the impedance in the FM radio broadcast band can be used as the FM / digital radio combined antenna 20 and the second conductor wire 40 Can be canceled by the capacitive reactance due to the capacitive coupling with the.

  Therefore, in the glass antenna 10, the decrease in the reception sensitivity of the FM antenna in the FM / digital radio combined antenna 20 can be suppressed in the FM radio broadcast band, and the reception sensitivity of the FM antenna can be favorably secured. .

  As shown in FIG. 1, the glass antenna 10 is also an FM / digital radio combined antenna 50 in which an FM antenna and a digital radio antenna are combined on the right side of the vehicle which is the upper side of the rear window glass 1 and the other side in the vehicle width direction. And a first conductor wire 60 at least a part of which is disposed in the rear window glass 1 and provided correspondingly to the FM / digital radio combined antenna 50 and a first conductor wire 60 disposed in the rear window glass 1. The second conductor wire 70 disposed in proximity to the FM / digital radio antenna 50 so as to be capacitively coupled to the FM / digital radio antenna 50 while being connected to one end portion, and the other end of the first conductor wire 60 And a feed terminal 75 connected to the The FM / digital radio combined antenna 50, the first conductor wire 60 and the second conductor wire 70 disposed on the rear window glass 1 are each formed by printing a conductive wire made of conductive silver paste on the rear window glass 1 ing.

  The FM / digital radio combined antenna 50 is formed symmetrically with the FM / digital radio combined antenna 20 on the rear window glass 1 in the vehicle width direction, and the high frequency signal of the FM radio broadcast band whose center frequency is the first wavelength The FM antenna set to receive and the digital radio antenna set to receive a high frequency signal of the digital radio broadcast band whose center frequency is the second wavelength are used in common.

  Also for the FM / digital radio combined antenna 50, a plurality of horizontal portions extending in parallel in the horizontal direction in the vehicle width direction, specifically, a first horizontal portion 51 and a second horizontal portion arranged to be separated by a predetermined distance sequentially from the upper side The first vertical portion 56 and the second vertical portion which extend in the vertical direction by connecting the end portions of the right, left, and right sides of the plurality of horizontal portions 51 respectively by connecting the third, fourth, and fifth horizontal portions And a unit 57.

  The feed terminal 75 for the FM / digital radio combined antenna 50 is formed in the same manner as the feed terminal 45 for the FM / digital radio combined antenna 20 and on the outer side of the rear window glass 1 covered by the rear pillar cover 2 in the vehicle width direction. It is arranged and attached to the cabin side of the rear window glass 1. The feed terminal 75 is also disposed closer to the center of the rear window glass 1 than the inner edge of the flange portion of the vehicle body component to which the rear window glass 1 is attached.

  The feed terminal 75 is connected to the antenna amplifier 15 via the antenna connection line 14 that functions as the first conductor line 60 without being disposed in the rear window glass 1, and is connected to a receiver (not shown) to the antenna amplifier 15. The coaxial cable 16 is connected, and the radio wave received by the FM / digital radio shared antenna 50 can be amplified from the feeding terminal 75 to the receiver by the antenna amplifier 15 and transmitted. The antenna amplifier 15 is grounded to the rear pillar of the vehicle.

  The first conductor wire 60 disposed in the rear window glass 1 is formed substantially symmetrically with the first conductor wire 30 in the vehicle width direction, and one end thereof is in the vicinity of the second vertical portion 57 of the FM / digital radio antenna 50. The first horizontal portion 51 is disposed at a position spaced apart from the first horizontal portion 51 by a predetermined distance, and the other end is connected to the feed terminal 75. In the glass antenna 10, the distance between one end of the first conductor wire 60 and the first horizontal portion 51 of the FM / digital radio antenna 50 is set to 15 mm.

  The first conductor line 60 is also formed to have a length set based on a half length of the second wavelength, which is the wavelength of the center frequency of the digital radio broadcast band, and is arranged on the rear window glass 1 The sum of the length obtained by dividing the length of the first conductor wire 60 to be provided by the glass shortening ratio α of the rear window glass 1 and the length of the antenna connection line 14 is within a predetermined range of half the second wavelength, for example ± It is formed to be within 20%. The length of the antenna connection line 14 is set in the vicinity of 150 mm in order to ensure ease of assembly.

  The first conductor line 60 is also formed to have a length in the vicinity of a quarter of the first wavelength, which is the wavelength of the center frequency of the 88 to 108 MHz FM radio broadcast band, and disposed on the rear window glass 1 The sum of the length of the first conductor wire 60 divided by the glass shortening ratio α of the rear window glass 1 and the length of the antenna connection wire 11 is a length near the quarter length of the first wavelength To be formed.

  The first conductor wire 60 disposed in the rear window glass 1 also has a first vertical portion extending upward from one end and a first horizontal portion extending substantially horizontally from the upper end of the first vertical portion to the right side of the vehicle And a second vertical portion that extends downward from the vehicle right side of the first horizontal portion and is connected to the feed terminal 75.

  And the sum of the length obtained by dividing the sum of the lengths of the first vertical part, the first horizontal part and the second vertical part by the glass shortening ratio α of the rear window glass 1 and the length of the antenna connection line 14 is 170 to 240 MHz It is formed to be within a predetermined range of one half of the second wavelength which is the wavelength of the center frequency of the digital radio broadcast band. The first conductor wire 60 is not disposed in the vehicle window glass 1 because the length of the portion disposed in the vehicle window glass 1 is within a predetermined range of half the second wavelength. It is provided to have a length obtained by multiplying the glass shortening rate α by the length obtained by reducing the length of

  In the first conductor wire 60, the length of the first vertical portion is set to 15 mm, the sum of the lengths of the first horizontal portion and the second vertical portion is set to 340 mm, and The length of one conductor wire 60 is set to 355 mm, and the length of the antenna connection wire 11 is set to 150 mm.

  The second conductor wire 70 is disposed in proximity to the FM / digital radio antenna 50 at a predetermined distance so as to capacitively couple with the FM / digital radio antenna 50, and the vehicle from the one end of the first conductor wire 60 On the right side, a first horizontal portion extending horizontally in parallel along the first horizontal portion 51 of the FM / digital radio antenna 50, and a first vertical portion extending downward from the end on the right side of the vehicle of the first horizontal portion A second horizontal portion extending horizontally in parallel along the first horizontal portion 51 of the FM / digital radio antenna 50 on the left side of the vehicle from the lower end portion of the first vertical portion.

  In the glass antenna 10, the distances between the first horizontal portion and the second horizontal portion of the second conductor wire 70 and the first horizontal portion 51 of the FM / digital radio antenna 50 are set to 5 mm and 15 mm, respectively. The second conductor wire 70 has a distance of 20 mm between the first horizontal portion and the inner edge portion of the flange portion of the vehicle body component formed of metal such as steel plate, and is not capacitively coupled to the vehicle body component.

  The second conductor line 70 is formed to have a length set based on a quarter length of the second wavelength which is a wavelength of the center frequency of the digital radio broadcast band of 170 to 240 MHz, and the rear window The length of the second conductor wire 70 disposed on the glass 1 divided by the glass shortening ratio α of the rear window glass 1 is formed to be within a predetermined range of 1⁄4 of the second wavelength There is.

  Specifically, the length of the second conductor wire 70 is specifically the length obtained by dividing the length of the second conductor wire 70 disposed on the rear window glass 1 by the glass shortening ratio α of the rear window glass 1 Is set to a length within a predetermined range, for example, ± 20% with respect to a length of a quarter of the second wavelength which is a wavelength of the center frequency of the digital radio broadcast band of 170 to 240 MHz. In the glass antenna 10, the lengths of the first horizontal portion and the second horizontal portion are respectively set to 140 mm and 150 mm, the length of the first vertical portion is set to 10 mm, and the second is disposed on the rear window glass 1 The length of the conductor wire 70 is set to 300 mm. The predetermined range is set such that, for example, in the frequency characteristics of the digital radio broadcast band of 170 to 240 MHz, an average reception sensitivity equal to or higher than a predetermined reception sensitivity near -10 dB in ratio to the dipole antenna is obtained. .

  As a result, the FM / digital radio combined antenna 50 can also be prevented from lowering the reception sensitivity of the FM antenna and the digital radio antenna in the FM / digital radio combined antenna 50, and the reception sensitivity of the FM antenna and the digital radio antenna Can be secured well.

  Thus, by providing the FM / digital radio combined antenna 20, 50 respectively on both sides in the vehicle width direction of the rear window glass 1, the FM / digital radio combined antenna can be diversified, and the FM antenna and the digital radio The reception sensitivity of the antenna can be improved.

  The second conductor wire 70 disposed in the vicinity of the FM / digital radio antenna 50 disposed on the right side of the vehicle of the rear window glass 1 is disposed on the inward side of the rear window glass 1 in the vehicle width direction. An AM antenna 80 set to receive a high frequency signal in the broadcast band is connected.

  The AM antenna 80 is set to receive AM radio broadcasts in the AM radio broadcast band of 500 to 1700 kHz, and a plurality of horizontal portions 81 extending in parallel in the horizontal direction, specifically, a predetermined distance away from the upper side Connect the first left side 81, the second side, the third side, the fourth side, the fifth side and the sixth side, and the ends on the left side of the multiple side parts 81 A first vertical portion 82 extending in the vertical direction and a second vertical portion 83 extending downward from the end of the first horizontal portion 81 on the vehicle right side and connected to the second conductor wire 70 are provided.

  In the glass antenna 10, the separation distance of the plurality of horizontal portions 81 is set to 30 mm, and the end portions on the left side of the vehicle of the second horizontal portion, the third horizontal portion, the fourth horizontal portion, the fifth horizontal portion and the sixth horizontal portion The distance between the FM and the digital radio combined antenna 20 is set to 50 mm, and the second side, the third side, the fourth side, the fifth side and the sixth side of the vehicle right end and the FM and the digital side The distance between the radio antenna 50 is set to 60 mm.

  The AM antenna 80 is also formed by printing a conductor wire made of a conductive paste on the rear window glass 1.

  In the glass antenna 10, the radio wave in the AM radio broadcast band received by the AM antenna 80 can be amplified by the antenna amplifier 15 from the feeding terminal 75 to the receiver and transmitted.

  Thus, by providing the AM antenna 80 set to receive the high frequency signal of the AM radio broadcast band on the inner side in the vehicle width direction of the rear window glass 1 and by being connected to the second conductor wire 70, AM Also for the antenna 80, the feed terminal 75 can be shared with the FM antenna and the digital radio antenna.

  The rear window glass 1 is also provided with a defogger 90, and the defogger 90 is arranged from one side of the rear window glass 1 in the vehicle width direction to the other side. The FM / digital radio combined antenna 20, 50, the first conductor wires 30, 60, the second conductor wires 40, 70 and the AM antenna 80 are disposed above the defogger 90.

  The defogger 90 connects a plurality of heat wires 91 arranged substantially symmetrically in parallel from the left side of the rear window glass 1 to the right side of the vehicle and ends of the left and right sides of the plurality of heat wires 91 respectively. A pair of left and right bus bars 92 extending in the vertical direction is provided, and current is supplied from a power supply (not shown) to the plurality of heat wires 91 via the bus bars 92 to prevent the rear window glass 1 from being fogged. In FIG. 1, only the uppermost and lowermost heating wires of the plurality of heating wires 91 are shown.

  The defogger 90 also includes conductor wires 93 extending downward from the uppermost heating wire 91 among the plurality of heating wires 91 so as to intersect the plurality of heating wires 91. In the glass antenna 10, conductor wires 93a, 93b, 93c are provided on the vehicle left side, the vehicle right side, and the vehicle center side of the rear window glass 1, respectively.

  The conductor wires 93a and 93b are formed to extend from the uppermost heating wire 91 to the lowermost heating wire 91, and the conductor wire 93c is lower than the uppermost heating wire 91 and the lowermost heating wire 91. It is formed to extend from the lower end to the left side and the right side of the vehicle.

  The defogger 90 can be used as an antenna for assisting the FM antenna in the FM / digital radio combined antenna 20, 50 by being disposed close to the lower side of the FM / digital radio combined antenna 20, 50. , And the reception sensitivity of the FM antenna can be further improved.

  The heat wire 91 and the conductor wire 93 are formed by printing the conductive silver paste on the rear window glass 1 also for the defogger 90.

  As described above, the glass antenna 10 according to the present embodiment is used as both the FM radio broadcast band having the first and second wavelengths at the center frequency and the FM antenna and the digital radio antenna for receiving high frequency signals in the digital radio broadcast band. FM / digital radio combined antenna 20, and a first conductor wire 30 having a length at least a part of which is set on the window glass 1 for a vehicle and set based on a half length of the second wavelength And have a length set based on the length of a quarter of the second wavelength while being disposed on the vehicle window glass 1 and connected to one end of the first conductor wire 30 and · A feed terminal 45 is provided with a second conductor wire 40 disposed close to the antenna for capacitive coupling with the digital radio antenna 20, and a feed terminal 45 connected to the other end of the first conductor wire 30; The rear pillar hippo Are arranged in the vehicle width direction outer side of the vehicle window glass 1 is covered by 2.

  As a result, the feed terminal 45 is not covered by the rear pillar cover 2 and is not exposed to the vehicle interior. Therefore, the passenger in the rear seat contacts the feed terminal 45 without providing a separate cover member for covering the feed terminal 45. Damage to the feeding terminal 45 can be prevented.

  The first conductor wire 30 connected to the feeding terminal 45 is capacitively coupled to the FM / digital radio combined antenna 20 via the second conductor wire 40, whereby the impedance of the first conductor wire 30 in the FM radio broadcast band is obtained. The inductive reactance due to the inductance based on the difference in length with the quarter of the first wavelength can be canceled by the capacitive reactance due to the capacitance of the capacitive coupling between the FM / digital radio combined antenna 20 and the second conductor wire 40 Therefore, the decrease in the reception sensitivity of the FM antenna in the FM / digital radio combined antenna 20 can be suppressed, and the reception sensitivity of the FM antenna can be favorably secured.

  In addition, the first conductor wire 30 has a length set based on the length of a quarter of the second wavelength, and is disposed in the vicinity of the FM / digital radio combined antenna 20. By being connected to the wire 40, it can be regarded as a configuration in which one end of the first conductor wire 30 is directly connected to the FM / digital radio combined antenna 20, and the first conductor wire 30 is divided by the second wavelength. Since the reception sensitivity of the digital radio antenna can be made approximately equal at one end P1 and the other end P2 of the first conductor wire 30 by having the length set based on one length, FM -It can suppress that the receiving sensitivity of the digital radio antenna in the digital radio combined antenna 20 falls, and can ensure the receiving sensitivity of the digital radio antenna favorably.

  Therefore, in the glass antenna 10, while sharing the feed terminal 45 of the FM antenna and the digital radio antenna, the reception sensitivity of the FM antenna and the digital radio antenna can be favorably secured and the damage of the feed terminal 45 can be prevented. .

  Although the glass antenna 10 is provided with the FM / digital radio combined antenna 20, 50, it is also possible not to include the FM / digital radio combined antenna 50. In addition, the glass antenna 10 may not include the AM antenna 80.

  The present invention is not limited to the illustrated embodiment, and various improvements and design changes are possible without departing from the scope of the present invention.

  As described above, according to the present invention, it is possible to ensure the reception sensitivity of the FM antenna and the digital radio antenna well while sharing the feeding terminal in the glass antenna and to prevent the feeding terminal from being damaged. And the glass antenna may be suitably used in the manufacturing industry of vehicles such as automobiles.

DESCRIPTION OF SYMBOLS 1 Vehicle window glass 2 Rear pillar cover 10 Glass antenna 11, 14 Antenna connection line 20, 50 FM and digital radio combined antenna 30, 60 1st conductor wire 40, 70 2nd conductor wire 45, 75 Feeding terminal 80 AM antenna

Claims (4)

A glass antenna disposed on a window glass for a vehicle;
An FM antenna disposed on the window glass for a vehicle and set to receive a high frequency signal of an FM radio broadcast band whose center frequency is the first wavelength, and a digital radio whose center wavelength is the second wavelength An FM / digital radio combined antenna that is also used as a digital radio antenna set to receive high frequency signals in the broadcast band,
A first conductor wire at least a part of which is disposed on the vehicle window glass and having a length set based on a half length of the second wavelength;
It has a length which is disposed on the window glass of the vehicle and connected to one end of the first conductor wire and which is set based on a quarter length of the second wavelength, and the FM A second conductor wire disposed close to the FM / digital radio combined antenna so as to capacitively couple with the digital radio combined antenna;
A feed terminal connected to the other end of the first conductor wire;
Equipped with
The power supply terminal is disposed on the outer side in the vehicle width direction of the window glass for vehicle covered by a rear pillar cover.
A glass antenna characterized by The first conductor wire is not disposed on the vehicle window glass because the length of the portion disposed on the vehicle window glass is within a predetermined range of a half of the second wavelength. To have a length obtained by multiplying the glass shortening rate by the length obtained by subtracting the length of
The second conductor wire has a length obtained by multiplying the length within a predetermined range of a quarter of the second wavelength by the glass shortening rate, with the length of the portion disposed on the window glass for vehicle Provided in
The glass antenna according to claim 1, characterized in that: The FM / digital radio combined antenna is respectively provided on both sides in the vehicle width direction of the window glass for vehicles.
The glass antenna according to claim 1 or 2, characterized in that: An AM antenna configured to receive a high frequency signal in an AM radio broadcast band is provided on the inner side in the vehicle width direction of the window glass for the vehicle,
The AM antenna is connected to the second conductor wire.
The glass antenna according to any one of claims 1 to 3, characterized in that.

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