JP2009272821A - On-vehicle flat antenna for terrestrial digital broadcasting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle antenna for terrestrial digital broadcasting installed on a dashboard. <P>SOLUTION: This flat antenna 2 has a first coupling part pattern 6 divided at one part on a first surface of a circuit board and formed into a loop-like shape, and a second coupling pattern formed into nearly the same shape on a second board surface on the opposite side, and both the patterns are arranged oppositely to each other by interposing the circuit board to form capacitance coupling and magnetic induction coupling states. A case 34 for housing the flat antenna therein is attached to a base 33 mounted on a dashboard by a hinge 35 in an angle adjustable manner. The flat antenna does not interrupt with a visual field, and it is not necessary for a wire to pass through a front pillar. The inclination of the antenna can be adjusted corresponding to the inclination of a windshield. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a planar antenna for digital terrestrial broadcasting installed in an automobile.

  Conventionally, film antennas and rod antennas are known as terrestrial digital broadcast antennas mounted on automobiles. Among these, the film antenna is used by attaching the antenna pattern itself or the film on which the antenna pattern is formed to the inner surface of the windshield of the automobile, and does not take up much space for installation compared to the rod antenna. Is also relatively simple and widely used. However, the film antenna may not be attached to any position on the windshield, and in order to ensure the field of view necessary for safe driving, comply with the conditions stipulated in the safety standards of the Ministry of Land, Infrastructure, Transport and Tourism. It must be installed within a predetermined tolerance of the upper edge or both side edges.

  Further, since the film antenna for digital terrestrial broadcasting is used by being attached within a predetermined allowable range near the upper edge or side edge of the windshield as described above, the antenna wiring is removed from the pillar cover of the front pillar. It was usual to draw along the front pillar and lead it down the dashboard.

  Since the airbag device for the front seat is usually housed inside the front pillar of an automobile, the wiring of the film antenna attached to the upper and side edges of the windshield is routed around the front pillar. Therefore, it is difficult to ensure that there is no possibility of adversely affecting the operation of the airbag, which is an important safety device.

  However, there is a problem that the film antenna has to be attached to the upper edge of the windshield for safety or compliance with safety standards, and therefore the wiring has to be routed inside the front pillar. It was. It is only necessary to attach the film antenna to a position other than the upper edge or side edge of the windshield so that the antenna wiring does not have to be routed inside the front pillar. However, the conventional film antenna does not have sufficient sensitivity, so it cannot be used, and in addition to the top and side edges of the windshield, an appropriate attachment that corresponds to the characteristics and structure of the film antenna. The current situation is that no place was found.

  Therefore, the present invention provides a vehicle-mounted antenna for digital terrestrial broadcasting that satisfies the requirement of safety standards for ensuring the field of view necessary for safe driving and does not require the antenna wiring to be routed through the front pillar. It is an object.

In order to achieve the above-mentioned object, the present invention is characterized in that a flat antenna with a low directivity having a broadband characteristic capable of receiving digital terrestrial broadcasting is used and installed on a dashboard at various angles. Yes.
Hereinafter, the configuration will be specifically described along each claim.

The in-vehicle planar antenna for digital terrestrial broadcasting described in claim 1 of the present application is
A first coupling portion pattern formed in a loop shape divided at one place on a first substrate surface of a circuit board made of a dielectric, and formed in a loop shape divided at one position on a second substrate surface of the circuit board. The first coupling portion pattern and the second coupling portion pattern sandwich the circuit board so that a capacitive coupling state and a magnetic induction coupling state are formed with each other. A planar antenna having a high-frequency coupler disposed opposite to each other,
A base installed on the dashboard of the car,
The planar antenna corresponding to the inclination angle of the windshield so that the front antenna of the base close to the windshield of the automobile and the planar antenna are connected and the planar antenna can face the windshield. Angle adjusting means for adjusting the inclination angle of
It is characterized by having.

The in-vehicle planar antenna for digital terrestrial broadcasting according to claim 2 is:
A base provided on a dashboard of an automobile, and a base including an antenna mounting portion provided at an angle corresponding to an inclination angle of the windshield at a front edge of the base near the windshield of the automobile;
A first coupling portion pattern formed in a loop shape divided at one place on a first substrate surface of a circuit board made of a dielectric, and formed in a loop shape divided at one position on a second substrate surface of the circuit board. The first coupling portion pattern and the second coupling portion pattern sandwich the circuit board so that a capacitive coupling state and a magnetic induction coupling state are formed with each other. A planar antenna attached to the antenna mounting portion of the base so as to face the windshield,
It is characterized by having.

The in-vehicle flat antenna for digital terrestrial broadcasting according to claim 3 is the in-vehicle flat antenna for digital terrestrial broadcasting according to claim 2,
The base is a sheet metal product comprising a substrate attached to the dashboard of the automobile, and an attachment plate that is integrated with the substrate and bent at an angle corresponding to the inclination angle of the windshield of the automobile,
The planar antenna is housed therein, and has a translucent case that is engaged with the mounting plate of the base in order to place and fix the planar antenna on the mounting plate of the base. It is characterized by.

The in-vehicle planar antenna for digital terrestrial broadcasting according to claim 4 is:
A first coupling portion pattern formed in a loop shape divided at one place on a first substrate surface of a circuit board made of a dielectric, and formed in a loop shape divided at one position on a second substrate surface of the circuit board. The first coupling portion pattern and the second coupling portion pattern sandwich the circuit board so that a capacitive coupling state and a magnetic induction coupling state are formed with each other. A planar antenna having a high-frequency coupler disposed opposite to each other,
Means for installing the planar antenna on a dashboard of an automobile;
It is characterized by having.

The in-vehicle planar antenna for digital terrestrial broadcasting according to claim 5 is the in-vehicle planar antenna for digital terrestrial broadcasting according to any one of claims 1 to 4,
The external wiring connected to the planar antenna is wired without passing through the front pillar of the automobile.

  According to the vehicle-mounted planar antenna for digital terrestrial broadcasting described in claim 1 of the present application, sufficient performance can be obtained as a vehicle-mounted digital terrestrial broadcast antenna even when installed on the dashboard. Furthermore, if the base is installed at a position close to the windshield on the dashboard of the car, and the angle adjustment means adjusts the inclination angle of the flat antenna in accordance with the inclination angle of the windshield, the flat antenna becomes the windshield. Since it can be arranged in a parallel state facing the windshield at a close position, it is possible to obtain a space-saving effect of effectively using a narrow space on the dashboard while sufficiently securing a driving view. Combined with the excellent characteristics inherent in the planar antenna, it can exhibit the same or better performance as the conventional film antenna attached directly to the inner surface of the upper edge of the windshield as a terrestrial digital broadcasting antenna.

  According to the in-vehicle planar antenna for digital terrestrial broadcasting described in claims 2 and 3, if the base is installed at a position close to the windshield on the dashboard of the automobile, the planar antenna is located near the windshield. Since it arrange | positions in the parallel state which faced the windshield, the effect similar to the invention of Claim 1 is acquired.

  According to the vehicle-mounted planar antenna for digital terrestrial broadcasting described in claim 3, the planar antenna is simply attached to the mounting plate of the base, which is a sheet metal product formed by bending the plate material at a predetermined angle, with a translucent case. According to the configuration, the planar antenna can be arranged in a parallel state facing the windshield.

  According to the in-vehicle planar antenna for digital terrestrial broadcasting described in claim 4, since the planar antenna can be mounted flat on the dashboard of the automobile, it is narrow on the dashboard while ensuring a sufficient driving field of view. Sufficient performance can be achieved as an on-vehicle digital terrestrial broadcasting antenna while obtaining the space-saving effect of effectively using space.

  According to the in-vehicle planar antenna for digital terrestrial broadcasting described in claim 5, the planar antenna is arranged on the dashboard, and the external wiring connected to the planar antenna is guided downward without passing through the front pillar of the automobile. Therefore, there is no possibility of adversely affecting the operation of the airbag provided inside the front pillar.

  The inventor satisfies the requirements of safety standards for ensuring the field of view necessary for safe driving, and does not need to wire the antenna wiring through the front pillar, and is a new in-vehicle digital terrestrial broadcasting that replaces the film antenna. We have intensively studied the basic structure of the antenna. As a result, we obtained the idea of a flat antenna with a thin and compact structure that can be installed on the dashboard as an antenna to solve the above-mentioned problems, and as a result of continuing research and development to realize this, the following configuration was achieved. Devised a flat antenna.

  That is, the planar antenna is provided with a first coupling portion pattern formed in a loop shape divided at one place on the first board surface of the circuit board made of a dielectric, and is provided at one place on the second board surface of the circuit board. A second coupling portion pattern formed in a loop shape separated by the first coupling portion pattern and the second coupling portion pattern so as to form a capacitive coupling state and a magnetic induction coupling state with each other. An antenna having a high-frequency coupler having a configuration in which both patterns are arranged to face each other with the circuit board interposed therebetween, and has an optimum broadband characteristic for receiving terrestrial digital broadcasting.

Furthermore, as a result of continuing research and development on a specific structure for installing this planar antenna on the dashboard in an optimal manner for achieving the task, several types of specific installation structures suitable for the planar antenna have been obtained. developed.
Hereinafter, three embodiments of the basic structure of the planar antenna and the structure for installing the planar antenna on the dashboard will be described.

(1) 1st Embodiment (FIGS. 1-5)
The in-vehicle planar antenna 1 for digital terrestrial broadcasting of the present example shown in FIGS. 1 to 6 is a flat plate-like device that is installed flat on a dashboard of an automobile. And an adhesive layer 4 (for example, double-sided tape) as an installation means for installing the base 3 on the dashboard.

The planar antenna 2 of this example is an antenna in which a high-frequency transmitter having a high-frequency coupler capable of forming sufficient electrical coupling is incorporated as a balun.
As shown in part in FIG. 1, the high-frequency coupler included in the planar antenna 2 of this example is formed on a circuit board 5 made of a dielectric and a first substrate surface 5a of the circuit board 5, and is divided at one place. A loop-shaped first coupling portion pattern 6 and a loop-shaped second coupling portion pattern formed on the second substrate surface of the circuit board 5 (not shown) and divided at one place, although not shown in the figure. The first coupling part pattern 6 and the second coupling part pattern are arranged opposite to each other with the circuit board 5 interposed therebetween so that a capacitive coupling and a magnetic induction coupling state are formed. Yes.

  That is, FIG. 1 shows the first coupling portion pattern 6 formed on the first substrate surface 5a of the circuit board 5, and the second substrate surface of the circuit board 5 is opposite to the surface shown in FIG. Yes, since the second coupling part pattern is on the opposite surface, it is not shown in the figure. However, both patterns are arranged opposite to each other with the circuit board 5 interposed therebetween.

  FIG. 1 (or FIG. 5) and FIG. 3 both show the same antenna of the first embodiment, but both figures can be adopted as the first coupling portion pattern or the second coupling portion pattern. The pattern examples are shown in the same place for convenience.

  Here, it is preferable that the first coupling part pattern and the second coupling part pattern have a congruent or similar shape. In addition, the first coupling part pattern and the second coupling part pattern have an axis line perpendicular to the circuit board 5 such that their dividing positions (parts obtained by cutting a part of the loop shape or ring shape). It is desirable to arrange so that the positions are offset from each other by 180 degrees.

  Next, a high-frequency transmitter including the high-frequency coupler having first and second coupling portion patterns is formed on the first substrate surface 5a of the circuit board 5 in addition to the high-frequency coupler having the above-described configuration, A first high-frequency transmission circuit pattern 7 connected to the first coupler pattern 6; a second high-frequency transmission circuit pattern formed on the second substrate surface of the circuit board 5 and connected to the second coupler pattern; It has further.

  FIG. 1 shows a first coupling portion pattern 6 formed on the first substrate surface 5a of the circuit board 5 and a first high-frequency transmission circuit pattern 7 connected thereto, and the second substrate of the circuit board 5 is shown. The surface is on the opposite side of the surface shown in FIG. 1, and the second coupling portion pattern and the second high-frequency transmission circuit pattern connected thereto are on the opposite surface, so they are not shown in FIG. .

  The planar antenna 2 of this example uses the high-frequency transmitter as a balun connected to the antenna, and the first high-frequency transmission circuit pattern 7 is an unbalanced transmission circuit pattern. The high-frequency transmission circuit pattern is a balanced transmission circuit pattern.

  Further, the high-frequency transmitter having this configuration and the antenna pattern formed on the first substrate surface 5a of the circuit board 5 and connected to the unbalanced transmission circuit pattern can be used as a balun built-in antenna. An example planar antenna can be constructed.

  According to the planar antenna 2 of the present example, since the first coupling portion pattern 6 and the second coupling portion pattern are arranged to face each other with the circuit board 5 interposed therebetween, both patterns are coupled by magnetic induction coupling, Also coupled by capacitive coupling. Therefore, unlike the conventional case where patterns are formed on the same plane, the patterns are coupled by capacitive coupling, and the magnetic induction coupling state between the patterns is also improved. Therefore, compared with the prior art, it has a wide band and excellent transmission characteristics, is suitable for receiving terrestrial digital broadcasting, and reliably receives radio waves of, for example, 470 to 770 MHz even when installed on a dashboard in an automobile. Can be configured.

  As shown in FIGS. 1-4, the base 3 which accommodates the planar antenna 2 of the said structure is the flat half thin box shape, the lower half part 3a which accommodates a planar antenna, and translucent lower half part An upper lid portion 3b for sealing the planar antenna 2 is provided in the lower half portion 3a. Through the translucent upper lid 3b, the ring-shaped first coupling portion pattern 6 of the planar antenna 2 inside is seen through, and the design is high. A wiring 8 connected to the amplifier circuit on the circuit board 5 of the planar antenna 2 is drawn out from a through hole formed in the short side of the lower half 3a of the base 3.

  As shown in FIG. 5, the in-vehicle planar antenna 1 for digital terrestrial broadcasting has an adhesive layer as an installation means shown in FIGS. 2 to 4 in a posture in which the upper lid portion 3 b is placed on a dashboard 9 in a car interior. 4 (double-sided adhesive tape). The wiring 8 of the planar antenna 2 is routed under the dashboard 9 from the gap between the dashboard 9 and the front pillar 10 and is connected to a TV monitor of a car navigation device (not shown).

(2) Second embodiment (FIG. 6)
The in-vehicle planar antenna 1a for terrestrial digital broadcasting according to the second embodiment has the same configuration as that of the first example, but the base 3 that houses the planar antenna is the lower half 3a as in the first example. And the upper lid portion 3c having no translucency. The base 3 is black as a whole. The other points are the same as in the first example. According to this example, the pattern of the planar antenna 2 in the base 3 cannot be seen, and since it is flat as a whole and the color is black, it does not stand out when installed on the dashboard 9 and does not disturb the view.

(3) Third embodiment (FIGS. 7 to 12)
The in-vehicle planar antenna 1b for digital terrestrial broadcasting according to the third embodiment has the same configuration as that of the first example, but the base 13 for accommodating the planar antenna is different from the above examples.

  As shown in FIGS. 7 to 12, the base 13 of this example includes a base 13 a installed on the dashboard 9 of the automobile, and the windshield at the front edge of the base 13 a close to the windshield 15 of the automobile. And an antenna mounting portion 13b provided at an angle corresponding to 15 inclination angles. The base portion 13a and the antenna mounting portion 13b are integrally formed of resin, and the planar antenna 2 is housed inside an opening (not shown) so that the opening is closed.

  According to this example, if a plurality of types of inclination angles of the antenna mounting portion 13b of the base 13 are set in accordance with the inclination angles of a plurality of types of windshields 15, the windshield 15 of the automobile on which the antenna is to be installed. If the vehicle-mounted planar antenna 1b for digital terrestrial broadcasting having a different angle of the antenna mounting portion 13b of the base 13 is selected in accordance with the inclination angle of the base antenna 13, as shown in FIG. The planar antenna 2 can be arranged in parallel at a position close to the inner surface, has a wide bandwidth, excellent transmission characteristics, and is suitable for reception of terrestrial digital broadcasts. Moreover, since the installation position is in the vicinity of the lower edge of the windshield 15, it does not violate the requirement of the safety standard for ensuring the field of view necessary for safe driving.

(4) Fourth embodiment (FIGS. 13 to 15)
The in-vehicle planar antenna 1c for digital terrestrial broadcasting of the fourth embodiment has the same configuration as that of the first example, but the base 23 for accommodating the planar antenna is different from the above examples.

  As shown in FIGS. 13 to 15, the base 23 of the present example includes a substrate 23 a that is attached to the dashboard 9 of the vehicle with an adhesive layer 4 such as a double-sided adhesive tape, and a vehicle windshield that is integrated with the substrate 23 a. 15 is a sheet metal product including an attachment plate 23b bent at an angle corresponding to 15 inclination angles. The flat antenna 2 is housed in a translucent case 24 that is open on one side, and the open side of the case 24 that houses the flat antenna 2 is attached to the mounting plate 23 b of the base 23. The wiring 8 from the planar antenna 2 is drawn out through the through hole of the case 24.

  According to this example, if a plurality of types of inclination angles of the antenna mounting plate 23b of the base 23 are set in accordance with the inclination angles of a plurality of types of windshields 15, the windshield 15 of the automobile on which the antenna is to be installed. If the vehicle-mounted planar antenna 1c for digital terrestrial broadcasting having a different angle of the antenna mounting plate 23b of the base 23 is selected according to the inclination angle of the base 23, the planar antenna 2 is parallel at a position close to the inner surface of the windshield 15 in the installed state. Therefore, the planar antenna 2 having a wide band, excellent transmission characteristics, and suitable for receiving terrestrial digital broadcasts can exhibit higher performance. Moreover, since the installation position is in the vicinity of the lower edge of the windshield 15, it does not violate the requirement of the safety standard for ensuring the field of view necessary for safe driving. Further, since the base 23 is a sheet metal product having an integral structure, the manufacturing cost is low. Moreover, since the pattern of the planar antenna 2 can be seen through the translucent case 24, the design is high.

(5) Fifth embodiment (FIGS. 16 to 21)
The in-vehicle planar antenna for digital terrestrial broadcasting 1d of the fifth embodiment has the same configuration as that of the first example, but the base 33 for accommodating the planar antenna is different from the above examples.

  As shown in FIGS. 16, 17, and 20, the base 33 of this example is attached on the dashboard 9 of the automobile with an adhesive layer 4 such as a double-sided adhesive tape. Further, the planar antenna 2 of this example is housed in a case 34 so that the antenna pattern can be seen through the translucent upper surface. The case 34 housing the planar antenna 2 is connected to the front edge of the base 33 close to the windshield 15 of the automobile via a hinge 35 as an angle adjusting means having a function capable of fixing the position at a desired angle. Has been.

  18 and 19 show modified examples in which the shapes of the base 33, the case 34, and the hinge 35 as the angle adjusting means are different, but the basic shape and the function are the same.

  According to this example, as shown in FIGS. 21A and 21B, if the inclination angle of the case 34 with respect to the base 33 is adjusted in accordance with the inclination angle of the windshield 15 that varies depending on the vehicle type or the like, the base 33 and the angle of the planar antenna 2 with respect to the windshield 15 can be adjusted, and the planar antenna 2 can be arranged in parallel at a position close to the inner surface of the windshield 15. For this reason, one type of in-vehicle planar antenna 1d for digital terrestrial broadcasting can cope with various angles of the windshield 15, and the windshield 15 of any angle has a wide bandwidth and excellent transmission characteristics, and can receive digital terrestrial broadcasting. The performance as the suitable planar antenna 2 can be exhibited more highly. Moreover, since the installation position is in the vicinity of the lower edge of the windshield 15, it does not violate the requirement of the safety standard for ensuring the field of view necessary for safe driving. Moreover, since the pattern of the planar antenna 2 can be seen through the translucent case, the design is high.

It is a perspective view from the upper surface of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 1st Embodiment. It is a perspective view from the lower surface of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 1st Embodiment. (A) is a top view which shows the different antenna pattern of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 1st Embodiment, (b) is the same front view, (c) is the right side view. It is sectional drawing of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 1st Embodiment. It is a perspective view which shows the installation state of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 1st Embodiment from the vehicle inner side. It is a perspective view from the upper surface of the vehicle-mounted planar antenna for terrestrial digital broadcasting of 2nd Embodiment. It is the perspective view which looked at the vehicle-mounted planar antenna for digital terrestrial broadcasting of 3rd Embodiment from diagonally right forward. It is the perspective view which looked at the vehicle-mounted planar antenna for digital terrestrial broadcasting of 3rd Embodiment from the diagonally left front. (A) is a top view which shows the different antenna pattern of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 3rd Embodiment, (b) is the front view, (c) is the right side view, (d) is the bottom view. is there. It is sectional drawing of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 3rd Embodiment. It is a perspective view which shows the installation state of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 3rd Embodiment from the vehicle inner side. It is sectional drawing of the installation state of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 3rd Embodiment. It is the perspective view which looked at the vehicle-mounted planar antenna for digital terrestrial broadcasting of 4th Embodiment from diagonally right forward. It is the perspective view which looked at the vehicle-mounted planar antenna for terrestrial digital broadcasting of 4th Embodiment from the diagonally left rear. (A) is a top view of the vehicle-mounted planar antenna for digital terrestrial broadcasting of 4th Embodiment, (b) is the same front view, (c) is the right side view. It is the perspective view which opened the vehicle-mounted planar antenna for digital terrestrial broadcasting of 5th Embodiment, and was seen from diagonally right forward. It is the perspective view which closed the vehicle-mounted planar antenna for digital terrestrial broadcasting of 5th Embodiment, and was seen from the diagonally left front. (A) is a top view of the modification of the vehicle-mounted planar antenna for terrestrial digital broadcasting of 5th Embodiment, (b) is the same front view, (c) is the right side view. It is sectional drawing of the vehicle-mounted planar antenna for terrestrial digital broadcasting of 5th Embodiment. It is a perspective view which shows the installation state of the vehicle-mounted planar antenna for terrestrial digital broadcasting of 5th Embodiment from the vehicle inner side. It is sectional drawing which shows the state which installed the vehicle-mounted planar antenna for digital terrestrial broadcasting of 5th Embodiment corresponding to the windshield 15 from which inclination | tilt angles differ.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d ... Vehicle-mounted planar antenna for digital terrestrial broadcasting 2 ... Planar antenna 3, 13, 23, 33 ... Base 4 ... Adhesive layer as installation means 5 ... Circuit board of planar antenna 6 ... Planar antenna First coupling part pattern 7 ... First high frequency transmission circuit pattern of planar antenna 8 ... Wiring of planar antenna 9 ... Dashboard 10 ... Front pillar 15 ... Windshield

Claims (5)

A first coupling portion pattern formed in a loop shape divided at one place on a first substrate surface of a circuit board made of a dielectric, and formed in a loop shape divided at one position on a second substrate surface of the circuit board. The first coupling portion pattern and the second coupling portion pattern sandwich the circuit board so that a capacitive coupling state and a magnetic induction coupling state are formed with each other. A planar antenna having a high-frequency coupler disposed opposite to each other,
A base installed on the dashboard of the car,
The planar antenna corresponding to the inclination angle of the windshield so that the front antenna of the base close to the windshield of the automobile and the planar antenna are connected and the planar antenna can face the windshield. Angle adjusting means for adjusting the inclination angle of
An in-vehicle planar antenna for digital terrestrial broadcasting, characterized by comprising: A base provided on a dashboard of an automobile, and a base including an antenna mounting portion provided at an angle corresponding to an inclination angle of the windshield at a front edge of the base near the windshield of the automobile;
A first coupling portion pattern formed in a loop shape divided at one place on a first substrate surface of a circuit board made of a dielectric, and formed in a loop shape divided at one position on a second substrate surface of the circuit board. The first coupling portion pattern and the second coupling portion pattern sandwich the circuit board so that a capacitive coupling state and a magnetic induction coupling state are formed with each other. A planar antenna attached to the antenna mounting portion of the base so as to face the windshield,
An in-vehicle planar antenna for digital terrestrial broadcasting, characterized by comprising: The base is a sheet metal product comprising a substrate attached to the dashboard of the automobile, and an attachment plate that is integrated with the substrate and bent at an angle corresponding to the inclination angle of the windshield of the automobile,
The planar antenna is housed therein, and has a translucent case that is engaged with the mounting plate of the base in order to place and fix the planar antenna on the mounting plate of the base. The in-vehicle planar antenna for digital terrestrial broadcasting according to claim 2. A first coupling portion pattern formed in a loop shape divided at one place on a first substrate surface of a circuit board made of a dielectric, and formed in a loop shape divided at one position on a second substrate surface of the circuit board. The first coupling portion pattern and the second coupling portion pattern sandwich the circuit board so that a capacitive coupling state and a magnetic induction coupling state are formed with each other. A planar antenna having a high-frequency coupler disposed opposite to each other,
Means for installing the planar antenna on a dashboard of an automobile;
An in-vehicle planar antenna for digital terrestrial broadcasting, characterized by comprising: The in-vehicle planar antenna for digital terrestrial broadcasting according to any one of claims 1 to 4, wherein external wiring connected to the planar antenna is wired without passing through a front pillar of the automobile.

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