JP3258266B2 - Antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an antenna device, and more particularly, to an antenna device mounted on an automobile.

[0002]

2. Description of the Related Art As is well known, a television receiving antenna device installed in an automobile is an external antenna called a so-called diversity antenna, which is used on a roof, a rear glass, a trunk lid, or the like outside a vehicle body. There is a structure in which a plurality of monopole antennas are erected.

[0003]

However, since the conventional television receiving antenna device must be erected during use, it is equipped with another transmitting / receiving antenna device, for example, an antenna device for a car telephone or the like. In such a case, the antenna devices may stand up, and as a result, they may be unsightly and unfavorable in appearance. In addition, when assembling the antenna device, wiring work to the antenna element according to the reception band is required, so that the wiring structure on the vehicle body becomes complicated, and when the assembled antenna device is used and not used. Since the raising and lowering operation is sometimes required, the operation may be troublesome.

[0004] An object of the present invention is to provide an antenna device which does not impair the appearance and has good assemblability and operability in view of the above-mentioned problems in the conventional antenna device.

[0005]

In order to achieve this object, an invention according to claim 1 is an antenna device mounted on a vehicle body, wherein at least a spoiler provided in the vehicle body has at least a longitudinal direction of the spoiler. An antenna element is provided on one side and folded back and forth in the longitudinal direction of the spoiler in the front-rear direction of the vehicle body and formed in two rows. It is extended toward the support leg, and one of its ends is a power supply terminal which is positioned with a gap provided with respect to the ground portion formed of the float electrode with respect to the vehicle body and is connected to a power supply portion in the vehicle body. In addition, a ground wire of a power supply line is connected to the ground portion.

According to a second aspect of the present invention, in the antenna device according to the first aspect, the antenna element includes a metal strip element having a width of 2% or more of an extension length in a plane in a longitudinal direction of the spoiler. The spoiler is folded back in the front-rear direction, and each folded end is extended toward the vehicle body along the installation direction of the support leg of the spoiler.

[0007] The invention described in claim 3 is claim 1 or 2.
The above-described antenna device is characterized in that the antenna elements are arranged on both longitudinal sides of the spoiler.

[0008]

According to a fourth aspect of the present invention, in the antenna device according to any one of the first to third aspects, the antenna element has a folded metal band-shaped element sealed in the spoiler. I have.

[0010]

According to the first, second and fourth aspects of the present invention, a planar antenna structure can be obtained by folding an antenna element formed of a metal band element in the front-rear direction of the vehicle body in the same plane. In addition, one of the folded ends is positioned with a gap provided with respect to the grounding portion formed of the float electrode with respect to the vehicle body, and is configured as a power supply terminal to which a power supply line is connected. Since the path is formed by the ground wire of the feed line connected to the grounding portion, the feed portion to the antenna element extended along the spoiler leg is wired only for the side where the feed terminal is located. No problem. This can simplify wiring processing and wiring work for the antenna device required for the spoiler legs. Furthermore, since the antenna element does not protrude from the spoiler by being enclosed inside the spoiler, the antenna element is configured without becoming a protruding portion on the vehicle body.

According to the third aspect of the present invention, two reception bands can be obtained only by providing the antenna elements on both sides of the wing surface of the spoiler, whereby the antenna element can be raised from the wing surface of the spoiler. This eliminates the need for an antenna stand on the vehicle body surface.

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is a perspective view showing a part of a vehicle body to which a spoiler to which an antenna device according to an embodiment of the present invention is applied is attached. In FIG. 1, a spoiler 1 is a molded product made of an electrically insulating member such as a resin. It is integrated with the vehicle body side at the rear part of the vehicle body 2. In the example shown in FIG. 1, the rear spoiler provided on the upper surface of the rear edge of the trunk lid 2A for opening and closing the trunk room located at the rear part of the vehicle body 2 is shown. However, the present invention is not limited to this example, and the hatchback is not limited to this example. It is also possible to target a roof spoiler provided on the upper rear edge of a type roof.

Inside a spoiler 1 (hereinafter referred to as a rear spoiler for convenience), an antenna device 3 having a configuration shown in FIG. 2 is provided at least on one side in the longitudinal direction of the rear spoiler 1, in this embodiment on both sides. (For convenience, the antenna device on the other side is indicated by 3 '). In FIG. 2, the antenna device 3 is composed of metal strip elements 3A and 3A 'having a length capable of efficiently receiving signals corresponding to the resonance frequency and a width of 2% or more of the length. Metal strip element 3
A and 3A 'are folded back in the longitudinal direction of the wing portion of the rear spoiler 1 in the longitudinal direction of the vehicle body, and each end obtained by folding is bent along the support leg 1A of the rear spoiler 1. In the case of the present embodiment, the folded portions of the metal strip elements 3A, 3A 'have both ends cut off obliquely. The length of the antenna devices 3 and 3 'in the longitudinal direction is made different at each end in the longitudinal direction of the rear spoiler 1 in accordance with the difference in the reception band.

Each end of the metal strip elements 3A, 3A 'constitutes a start end and an end of the antenna device 3, 3' at the turnback position, and as shown in FIG. One is 10 mm with respect to the capacitive grounding plates 3B and 3B 'which form a capacitive grounding portion composed of a float electrode electrically floating with respect to the spoiler mounting position of the trunk lid 2A.
The power supply terminals 3C and 3C 'are positioned by providing gaps before and after (gap indicated by reference numeral L in the figure). By setting the gap size, the antenna elements 3, 3 'can be capacitively connected to the capacitive ground plates 3B, 3B'. Capacitive ground plates 3B, 3B 'are connected to their terminal surfaces and the lower surfaces of support legs 1A,
That is, the distance between the support leg 1A and the contact surface of the trunk lid 2A is set on the assumption that the distance between the support leg 1A and the trunk lid 2A is a capacity corresponding to the reception band, and the float electrode is interposed with an electrical insulating layer corresponding to the distance. It is also possible to configure
By utilizing the fact that the rear spoiler 1 is made of resin, it is of course possible to separate the resin existing between the trunk lid 2A from the mounting position of the rear spoiler as described above and to use the resin present therebetween as the insulating layer.

As shown in FIG. 3B, a core wire 5A, which is an internal conductor of a feed line 5 formed of a coaxial cable, is connected to the feed terminals 3C and 3C '.
A ground wire 5B, which is an external conductor of the feeder line 5, is connected to B '.

In this embodiment, the metal strip elements 3A, 3A
A ′ along the longitudinal surface of the rear spoiler 1 at A ′ is a folded metal strip element
A central loading element 4 in which a metal pattern for capacitively coupling A, 3A 'is formed.

Since the present embodiment has the above configuration,
Metal strip elements 3A, 3 constituting antenna devices 3, 3 '
A ′, the capacitive grounding plates 3B, 3B ′ feed terminals 3C, 3C ′ and the central loading element 4 are sealed in the rear spoiler 1.
When enclosing the rear spoiler 1, as shown in FIG. 3 (A), the vehicle body 2 travels along the shape of the surface in the longitudinal direction of the rear spoiler 1 (in FIG. The antenna devices 3 and 3 'are enclosed in a state where the front edge of the folded piece is positioned at the front edge (direction indicated by arrow A). Rear spoiler 1
It is preferable that the antenna device is configured as a split type in a vertical direction that allows a sandwich structure so that the antenna devices 3 and 3 ′ can be sandwiched and sealed.

The antenna devices 3, 3 'sealed in the rear spoiler 1 are arranged on both sides in the longitudinal direction of the rear spoiler 1, so that one of them is "VHF LOW".
As the receiving part of the band, the other is "VHF HIGH"
It is configured as a receiver for the band and the “UHF” band.

As shown in FIG. 3, a power supply line 5 is connected to the power supply terminals 3C and 3C 'by using a mounting portion of the rear spoiler 1 to the trunk lid 2A. Antenna device 3,
When the position of the power supply path at 3 ′ is connected to the power supply terminals 3C and 3C ′, the terminal ends at the capacitive grounding plates 3B and 3B ′.
And a power supply path is formed at an edge corresponding to the front side in the traveling direction of the rear spoiler 1. When the rear spoiler 1 is attached to the trunk lid 2A, the antenna device 3,
The wiring to 3 'is performed only for the power supply terminals 3C and 3C' and the capacitance ground plates 3B and 3B 'opposed thereto.
For this reason, the wiring work at the time of assembling the rear spoiler 1 is simplified, and the support legs 1 where the ground terminals 3B, 3B 'are located as in the case where the vehicle body is used as the grounding portion.
The hole processing for A becomes unnecessary.

In the antenna devices 3 and 3 ', the ground terminals 3B and 3B' and the feed terminals 3C and
Since the center loading element 4 is arranged on the folded piece reaching 3C ', the fundamental resonance frequency (VHF L
It is possible to adjust the impedance of a higher frequency (UHF band) than that of the OW band, and it is possible to maintain a good reception state in that band.

Next, an embodiment related to the present invention will be described with reference to FIG. The embodiment shown in FIG. 4 is characterized in that the ends of the antenna element are positioned at both ends in the longitudinal direction of the spoiler, and one of them is disposed opposite to a ground portion grounded to the vehicle body with a predetermined gap. And In FIG. 4, the same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals. That is, in FIG. 4, in the antenna device 30, the metal strip-shaped elements 30 </ b> A and 30 </ b> A ′ constituting the antenna element are folded back in the longitudinal direction of the vehicle body in the plane of the wing section of the rear spoiler 1, and the folded end is the wing section. It is located in the plane. The metal strip-shaped elements 30A, 30A 'are positioned such that the folded end portions intersect the inner ends of the wings of the rear spoiler 1 and the support legs 1A. One end portion of each of the metal strip elements 30A and 30A 'has one end with respect to the capacitive grounding plates 30B and 30B' described later.
The power supply terminal 30C is provided with a gap of about 0 mm (a gap indicated by a symbol L in FIG. 4) and opposed to each other. The capacitive grounding plates 30B, 30B 'are plate members which are installed on the trunk lid 2A located on the vehicle body side and which stand upright in the support legs 1A, and the upper ends thereof are one ends of the metal strip elements 30A, 30A'. Power supply terminals 30C and 30C '
As described above, positioning is performed with a gap of about 10 mm. A core wire, which is an internal conductor of the power supply line 5 formed of a coaxial cable, is connected to the power supply terminals 30C and 30C ', and an external conductor included in the same power supply line 5 is connected to the capacitive grounding plates 30B and 30B'. Is connected.

Since the present embodiment has the above configuration,
As in the embodiment shown in FIG.
The metal strip-shaped elements 30A, 30A ', the capacitive grounding plates 30B, 30B', the power supply terminals 30C, 30C ', and the central loading element 4 constituting the 0' are sealed in the rear spoiler 1. The power supply terminals 30C and 30C 'are attached to the trunk lid 2A by using a mounting portion of the rear spoiler 1 as shown in FIG.
The core wire of the power supply line 5 is connected. Antenna device 30, 3
In the power supply path at 0 ', the power supply path is formed at an edge corresponding to the front side in the traveling direction of the rear spoiler 1. Rear spoiler 1
Is attached to the trunk lid 2A, the wiring to the antenna devices 30, 30 'is
C 'and the capacitive grounding plates 30B, 30B' opposed thereto.
Done only for For this reason, the wiring work at the time of assembling the rear spoiler 1 is simplified.

According to the embodiment as described above, the spoiler 1
Since only the metal strip elements 30A and 30A 'are arranged in the wing portion of the, unlike the embodiment shown in FIG.
The bending process along the installation direction of the support leg 1A of the spoiler 1 becomes unnecessary, and the antenna device can be assembled by separately assembling the wing portion of the spoiler 1 and the support leg 1A. There are no restrictions.

[0025]

As described above, according to the first, second and fourth aspects of the present invention, the antenna element composed of the metal strip element is folded back in the longitudinal direction of the vehicle body in the same plane. A planar antenna structure can be provided. In addition, one of the folded ends is positioned with a gap provided with respect to the grounding portion formed of the float electrode with respect to the vehicle body, and is configured as a power supply terminal to which a power supply line is connected. Since the path is formed by the ground wire of the feed line connected to the grounding portion, the feed portion to the antenna element extended along the spoiler leg is wired only for the side where the feed terminal is located. No problem. For this reason, wiring processing and wiring work for the antenna device required at the leg of the spoiler can be simplified. Furthermore, since the antenna element does not protrude from the spoiler by being enclosed inside the spoiler, the antenna element is configured without becoming a protruding portion on the vehicle body. Thereby, it is possible to prevent the appearance on the vehicle body from being spoiled by the stand of the antenna device. Moreover, since the wiring structure of the antenna device is intended only for the power supply terminal as described above,
Since it is not necessary to unnecessarily process the legs of the spoiler, it is possible to simplify wiring processing and wiring work. Further, since the antenna device is sealed in the spoiler, it is not necessary to perform the operation of raising and lowering the antenna element, so that the operability can be improved.

According to the third aspect of the present invention, two reception bands can be obtained only by providing the antenna elements on both sides of the wing surface of the spoiler, whereby the antenna elements are erected from the wing surface of the spoiler. This eliminates the need for an antenna stand on the vehicle body surface.

[0027]

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a vehicle using a spoiler to which an antenna device according to an embodiment of the present invention is applied.

FIG. 2 is a perspective view for explaining a main configuration of the antenna device according to the embodiment of the present invention.

FIG. 3 is a plan view and a side view of the antenna device shown in FIG. 2;

FIG. 4 is a perspective view for explaining a main configuration of an antenna device according to an embodiment related to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rear spoiler 1A Support leg 2 Body 2A Trunk lid 3, 3 ', 30, 30' Antenna device 3A, 3A ', 30A, 30A' Metal strip element 3B, 3B ', 30B, 30B' Ground plate 3C which forms a capacitive grounding part , 3C ', 30C, 30C' Feeding terminal A Vehicle traveling direction L Gap

Continuation of the front page (56) References JP-A-3-135882 (JP, A) JP-A-7-46013 (JP, A) JP-A 4-55805 (JP, U) JP-A 1-132105 (JP) , U) the Institute of Electronics and communication Engineers, antenna engineering handbook, Japan, shares the Shoao arm, Inc., July 10, 1984, the second impression of the first edition, 114-116 (58) investigated the field (Int.Cl. ⁷ H01Q 1/22 H01Q 1/48 H01Q 9/42

Claims (4)

(57) [Claims] 1. An antenna device mounted on a vehicle body, wherein the antenna device is provided at least on one side in a longitudinal direction of the spoiler inside a spoiler provided on the vehicle body, and the antenna device of the vehicle body is disposed within a plane in a longitudinal direction of the spoiler. An antenna element that is folded back and forth and formed in two rows, wherein the folded end of the antenna element is extended toward a support leg of the spoiler, and one of the ends is floated with respect to the vehicle body. A power supply terminal that is positioned with a gap with respect to a ground portion formed of electrodes and is connected to a power supply portion in the vehicle body, and a ground wire of a power supply line is connected to the ground portion. An antenna device characterized by the above-mentioned. 2. The antenna device according to claim 1, wherein
The antenna element is formed by folding a metal strip element having a width of 2% or more of an extension length in the longitudinal direction of the spoiler in the longitudinal direction of the vehicle body, and each folded end is provided with a support leg of the spoiler. An antenna device extending toward the vehicle body along a direction. 3. The antenna device according to claim 1, wherein the antenna elements are arranged on both sides in a longitudinal direction of the spoiler. 4. The method according to claim 1, wherein
In the antenna device, the antenna element is folded back.
Characterized by encapsulating a metal strip element inside the spoiler
Antenna device.