JP2012015836A - Mount antenna for automobile roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mount antenna for a roof with excellent sensitivity for receiving electric waves to replace the existing roof antennas for automobiles.SOLUTION: In order to install an antenna part composed of a composite body connecting a plate antenna element and a short axis coil antenna element for receiving electric waves such as the radio in the existing antenna base on a roof of an automobile to replace the existing pole antenna, the short axis coil antenna element is electrically connected to a conductive connection part of the existing antenna base from which the existing pole antenna is removed, and the plate antenna element fixed on the top inside an antenna cover is mounted on the upper part of the short axis coil antenna element to be fixed with the antenna cover covering the existing antenna base.

Description

  The present invention relates to a mount antenna for a roof of an automobile in which an existing pole antenna attached to the roof of the automobile is removed and replaced with a suitable antenna of the automobile mounted with a cover.

  Conventionally, since the pole antenna attached to the roof of an automobile has a height of about 18 cm, it is necessary to bend when hitting the ceiling when parking in an indoor parking lot, or to be removed when washing with an automatic car wash machine. Therefore, as an alternative to this pole antenna, there is a replacement antenna that can be easily replaced with an existing pole antenna, which is a genuine part, using a base for standing the pole antenna attached to the roof of the automobile. Known (for example, Patent Document 1).

JP 2009-219044

  The replacement antenna disclosed in the above-mentioned Patent Document 1 covers the trace of removing the existing pole antenna by covering it with a synthetic resin cover in which the antenna wire is inserted into the antenna wire insertion portion. It was necessary to reduce the height of the coil to a size of about 6 cm, and for that purpose, it was necessary to increase the number of turns of the coil. However, winding many coils reduces the efficiency of the antenna, lowers the radio wave reception sensitivity and reduces the bandwidth with good electrical characteristics, and has the problem that radio broadcasts cannot be heard with good sound quality. It was. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a roof mount antenna having good radio wave reception sensitivity.

  In order to achieve the above object, an invention according to claim 1 is directed to an antenna unit made of a complex in which a flat antenna element for receiving radio waves such as radio and a short axis coil antenna element is connected, instead of an existing pole antenna. When installing on the existing antenna base of the roof, the short axis coil antenna element is connected to the conductive connection part of the existing antenna base from which the existing pole antenna is removed so that it can be energized, and the antenna cover is placed above the short axis coil antenna element. A flat plate antenna element fixed to the top of the antenna is attached, and an antenna cover is placed on the existing antenna base and fixed.

  According to a second aspect of the present invention, there is provided the automobile roof mount antenna according to the first aspect, wherein the flat antenna element is formed of a wide area metal plate formed in accordance with the shape of the antenna cover. To do.

  The invention according to claim 3 is the automobile roof mount antenna according to claim 1, wherein the flat antenna element is formed of a wide-area metal plate formed in accordance with the shape of the antenna cover, with a plurality of gaps. It is characterized by being overlapped.

  According to a fourth aspect of the present invention, there is provided an automotive roof mount antenna according to any one of the first to third aspects, wherein the flat antenna element is configured to connect the flat antenna element and the short-axis coil antenna element. It connects by the connection means which connects the metal plate located in the lowest end and the front-end | tip part of a short-axis coil antenna element.

  According to the mount antenna for a roof of an automobile according to the first aspect of the present invention, an antenna portion made of a complex in which a flat antenna element for receiving radio waves such as a radio and a short axis coil antenna element is connected to an existing pole antenna. Instead, when installing on the existing antenna base of the roof of the car, connect the short axis coil antenna element to the conductive connection part of the existing antenna base from which the existing pole antenna is removed so that it can be energized, and above the short axis coil antenna element, Since a flat antenna element fixed to the apex in the antenna cover is attached and the antenna cover is fixed on the existing antenna base, the roof mount antenna with good radio wave reception sensitivity can be provided.

  According to the second aspect of the present invention, since the flat antenna element is made of a large-area metal plate formed in accordance with the shape of the antenna cover, the surface area of the flat antenna element is increased, and the short-axis coil antenna element is Even if the number of turns is reduced and the antenna size is reduced, the reception sensitivity can be improved.

  According to the third aspect of the present invention, the flat antenna element is formed by stacking a large area of metal plates formed in accordance with the shape of the antenna cover with a plurality of gaps therebetween. Therefore, the reception area can be expanded as well as the radio wave reception sensitivity.

  According to the invention of claim 4, when connecting the flat antenna element and the short axis coil antenna element, the metal plate located at the lowermost end constituting the flat antenna element and the tip of the short axis coil antenna element are Since it connects by the connection means to connect, the useful antenna function which brings out the outstanding receiving sensitivity by the combined means of reception by a metal plate and reception by a short axis coil antenna element can be exhibited.

It is an internal permeation | transmission perspective view of the antenna part which represented the cover of the mount antenna for roofs in one Embodiment of this invention with the imaginary line. FIG. 2 is a bottom perspective view of an antenna portion of the roof mount antenna in FIG. 1. It is an internal permeation | transmission perspective view of the antenna part which represented the cover of the roof mount antenna in other embodiment with the imaginary line. (A) is a longitudinal end view showing a connection example of a flat antenna element and a short-axis coil antenna element constituting an antenna part in one embodiment, and (b) is a flat antenna element constituting an antenna part in another embodiment. It is a vertical end view which shows the connection Example of a short axis coil antenna element. (A) is a diagram showing the matching state and bandwidth of an existing pole antenna (height 18 cm), (b) is the matching state and bandwidth of a replacement antenna (height 6 cm) with a reduced height. FIG. 4C is a diagram showing a matching state and a bandwidth of the roof mount antenna according to the embodiment of the present invention.

  One embodiment of a roof mount antenna according to the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is an internal perspective view of the antenna portion of the roof mount antenna of the present invention represented by an imaginary line, FIG. 2 is a bottom perspective view of the antenna portion of the roof mount antenna in FIG. The antenna cover 2 for receiving radio waves such as radio is fixed in the interior of the antenna cover made of synthetic resin. The fixing means is fixed using a double-sided tape or a known fixing means. Note that another material such as a fiber reinforced plastic (FRP) is also conceivable as the material of the antenna cover.

  The shape of the outer surface of the antenna cover 1 is substantially boat-shaped when viewed from above, and one end corresponding to the front of the vehicle to be mounted has a tapered shape, and the side surface shape reduces air resistance. The streamline shape is formed such that the height gradually increases from one end corresponding to the front of the vehicle toward the other end.

  The antenna unit 2 is connected to an existing antenna-based conductive connection part from which an existing pole antenna is removed so as to be energized, and can improve reception sensitivity and expand a reception area with a unique configuration. That is, the antenna unit 2 is a composite body in which the flat antenna element 3 and the short axis coil antenna element 7 are connected.

  The flat antenna element 3 is composed of a wide-area metal plate 31 formed in accordance with the shape of the antenna cover 1, and is composed of a horizontal portion 5 and a hypotenuse portion 6 with a constricted portion 4 serving as a folding line as a boundary. A pair of expansion wing pieces 5a, 5b, 6a and 6b are connected to the both side surface portions. As the material of the metal plate 31, various metal materials such as a copper plate, a light aluminum plate, or a stainless plate resistant to corrosion can be used.

  The short-axis coil antenna element 7 has a structure in which a coil 8 is wound around a gap core of about 3 cm, and a starting end portion 8a of the coil 8 is connected to a conductive fixed portion 11 to the metal plate of the flat antenna element 3 by soldering or the like. It is connected. The terminal portion 8b of the coil 8 is loosened from the lower end portion of the coil 8, and as a connecting lead wire 9, a lug terminal 10 provided at the terminal portion is replaced with an existing antenna base conductive connecting portion from which an existing pole antenna is removed. It is fixed to the connection receiving part of the existing antenna base so that it can be energized.

  As shown in FIG. 2, the connection between the flat antenna element 3 and the short-axis coil antenna element 7 is performed by arranging the short-axis coil antenna element 7 in an orthogonal state on the back surface of the metal plate 31 constituting the flat antenna element 3. As shown to (a), the front-end | tip part 8a of the coil 8 wound around the short axis coil antenna element 7 is connected and connected by the soldering 13 to the electroconductive fixed part 11 to the metal plate 31. The metal plate 31 and the short-axis coil antenna element 7 may be connected to the metal plate 31 by using a whisker spring provided on the short-axis coil antenna element 7 in addition to soldering. Further, a spring spring provided on the short axis coil antenna element 7 may be used to contact the metal plate 31.

  The operation of the antenna unit 2 configured as described above will be described. The antenna unit 2 is a composite body in which the flat antenna element 3 and the short-axis coil antenna element 7 are connected. In particular, the metal plate 31 constituting the flat antenna element 3 is a horizontal plate formed according to the shape of the antenna cover 1. Since the surface area is enlarged by the pair of extended wing pieces 5a, 5b, 6a and 6b connected to the portion 5 and the oblique side portion 6 and both side portions thereof, the number of turns of the short axis coil antenna 7 is reduced and the antenna size is reduced. Even so, the reception sensitivity can be improved.

  FIG. 5 is a diagram showing the matching state and bandwidth of each antenna, where the vertical axis represents the matching state and the horizontal axis represents the frequency bandwidth. FIG. 5A shows the matching state and bandwidth of the existing pole antenna (height 18 cm), and FIG. 5B shows the replacement antenna (high height) shown in FIG. 5B. Comparing the matching state (6 cm long) with the figure (b) showing the bandwidth, it can be seen that the frequency bandwidth of the replacement antenna (height 6 cm) with a reduced height is clearly narrow. On the other hand, FIG. 5 (c) is a diagram (c) showing the matching state and the bandwidth of the roof antenna mounted with the short-axis coil antenna element (height 3 cm) having a further reduced height and the flat antenna element. Is equivalent to the figure (a) showing the matching state and bandwidth of the existing pole antenna (height 18 cm), and the figure (b) showing the matching state and bandwidth of the replacement antenna (height 6 cm). It can be seen that the matching state is good and the frequency bandwidth is wide as compared with FIG.

  FIG. 3 is an internally transparent perspective view showing another embodiment of the antenna portion of the roof mount antenna. In the antenna cover 51, an antenna portion 52 for receiving radio waves such as radio is fixed. The fixing means is fixed using a double-sided tape or a known fixing means. Reference numeral 51 denotes a synthetic resin antenna cover in which an antenna portion 2 for receiving radio waves such as radio is fixed in the inner space. The fixing means is fixed using a double-sided tape or a known fixing means. Note that another material such as a fiber reinforced plastic (FRP) is also conceivable as the material of the antenna cover.

  The antenna cover 51 has an outer surface shape that is formed into a substantially boat shape when viewed from the top, and has a tapered shape at one end corresponding to the front of the vehicle to be mounted. The side surface shape reduces air resistance. The streamline shape is formed such that the height gradually increases from one end corresponding to the front of the vehicle toward the other end.

  The antenna unit 52 is connected to an existing antenna-based conductive connection unit from which an existing pole antenna is removed so as to be energized, and can improve reception sensitivity and expand a reception area with a unique configuration. That is, the antenna unit 52 is a composite body in which a plurality of flat plate antenna elements 3, 3... And a short axis coil antenna element 7 (FIG. 2) are connected.

  The flat antenna elements 3, 3... Are formed of metal plates 31, 31... Formed in accordance with the shape of the antenna cover 51, and the horizontal portion with the constricted portion 4 serving as a folding line as a boundary. 5 and a hypotenuse part 6, and a pair of extended wing pieces 5a, 5b..., 6a, 6b. As the material of the metal plate 31, various metal materials such as a copper plate, a light aluminum plate, or a stainless plate resistant to corrosion can be used.

  The flat antenna elements 3, 3... Are stacked with a plurality of metal plates 31, 31. It is fixed using known technical means.

  The short-axis coil antenna element 7 has a structure in which a coil 8 is wound around a gap core of about 3 cm, and a starting end portion 8a of the coil 8 is connected to a conductive fixed portion 11 to the metal plate of the flat antenna element 3 by soldering or the like. It is connected. The terminal portion 8b of the coil 8 is loosened from the lower end portion of the coil 8, and as a connecting lead wire 9, a lug terminal 10 provided at the terminal portion is replaced with an existing antenna base conductive connecting portion from which an existing pole antenna is removed. It is fixed to the connection receiving part of the existing antenna base so that it can be energized.

  It is preferable to use an insulator material such as rubber as a material for utilizing the vibration absorbing action by interposing the spacers 12 between the metal plates 31, 31. The metal plates 31, 31... Of the flat antenna elements 3, 3... Are formed according to the shape of the antenna cover 51, and a plurality of metal plates 31, 31. In this case, the surface areas of the flat antenna elements 3, 3,... Can be increased as much as possible because they are not overlapped with each other via the air gap S. It is possible not only to improve the reception sensitivity but also to expand the reception area.

  As described above, the connection between the flat antenna element 3 and the short-axis coil antenna element 7 is performed by connecting the short-axis coil antenna element 7 to the back surface of the metal plate 31 located at the lowermost end constituting the flat antenna elements 3, 3,. As shown in FIG. 4 (b), the tip 8 a of the coil 8 wound around the short-axis coil antenna element 7 is connected to the conductive fixed portion 11 to the metal plate 31 by soldering 13. Connecting. The metal plate 31 and the short-axis coil antenna element 7 may be connected to the metal plate 31 by using a whisker spring provided on the short-axis coil antenna element 7 in addition to soldering. Further, a spring spring provided on the short axis coil antenna element 7 may be used to contact the metal plate 31.

  The operation of the antenna unit 52 configured as described above will be described. The antenna section 52 is a composite body in which the flat antenna element 3 and the short-axis coil antenna element 7 are connected. In particular, the metal plate 31 constituting the flat antenna element 3 is a horizontal plate formed in accordance with the shape of the antenna cover 1. Since the surface area is further increased by the pair of extended wing pieces 5a, 5b, 6a, 6b connected to the portion 5 and the oblique side portion 6 and both side portions thereof, the number of turns of the short axis coil antenna element 7 is reduced, and Even if the antenna size is reduced, not only the reception sensitivity of radio waves can be improved, but also the reception area can be expanded.

  As described above, according to the roof mount antenna of the present invention, a single or a plurality of large-area metal plates formed in accordance with the shape of the antenna cover are overlapped on the short-axis coil antenna element. Since the flat antenna element fixed at the top of the antenna cover is provided, the reception sensitivity can be improved and the reception area can be expanded, and radio broadcasts can be heard with good sound quality.

DESCRIPTION OF SYMBOLS 1, 51 Antenna cover 2, 52 Antenna part 3 Flat antenna element 31 Metal plate S Air gap 7 Short axis coil antenna element 8 Coil 9 Connection lead wire 10 Lug terminal

The short-axis coil antenna element 7 has a structure in which a coil 8 is wound around a gap core of about 3 cm, and a front end portion 8a of the coil 8 is electrically fixed to the metal plate 31 of the flat antenna element 3 by soldering or the like. It is linked to. The terminal portion 8b of the coil 8 is loosened from the lower end portion of the coil 8, and as a connecting lead wire 9, a lug terminal 10 provided at the terminal portion is replaced with an existing antenna base conductive connecting portion from which an existing pole antenna is removed. It is fixed to the connection receiving part of the existing antenna base so that it can be energized.

FIG. 3 is an internally transparent perspective view showing another embodiment of the antenna portion of the roof mount antenna. In the antenna cover 51, an antenna portion 52 for receiving radio waves such as radio is fixed. The fixing means is fixed using a double-sided tape or a known fixing means. Reference numeral 51 denotes a synthetic resin antenna cover in which an antenna 52 for receiving radio waves such as radio is fixed in the interior. The fixing means is fixed using a double-sided tape or a known fixing means. Note that another material such as a fiber reinforced plastic (FRP) is also conceivable as the material of the antenna cover.

The short-axis coil antenna element 7 has a structure in which a coil 8 is wound around a gap core of about 3 cm, and a front end portion 8a of the coil 8 is electrically fixed to the metal plate 31 of the flat antenna element 3 by soldering or the like. It is linked to. The terminal portion 8b of the coil 8 is loosened from the lower end portion of the coil 8, and as a connecting lead wire 9, a lug terminal 10 provided at the terminal portion is replaced with an existing antenna base conductive connecting portion from which an existing pole antenna is removed. It is fixed to the connection receiving part of the existing antenna base so that it can be energized.

The operation of the antenna unit 52 configured as described above will be described. The antenna portion 52 is a composite body in which the flat antenna element 3 and the short-axis coil antenna element 7 are connected. In particular, the metal plate 31 constituting the flat antenna element 3 is a horizontal plate formed in accordance with the shape of the antenna cover 51. Since the surface area is further increased by the pair of extended wing pieces 5a, 5b, 6a, 6b connected to the portion 5 and the oblique side portion 6 and both side portions thereof, the number of turns of the short axis coil antenna element 7 is reduced, and Even if the antenna size is reduced, not only the reception sensitivity of radio waves can be improved, but also the reception area can be expanded.

Claims (4)

  When installing an antenna unit made of a complex connecting a flat antenna element and a short axis coil antenna element for receiving radio waves, such as a radio, on the existing antenna base of the automobile roof instead of the existing pole antenna, the short axis coil The antenna element is connected to the conductive connection portion of the existing antenna base from which the existing pole antenna is removed so as to be energized, and the flat antenna element fixed to the apex in the antenna cover is attached to the upper part of the short axis coil antenna element, A mount antenna for a roof of an automobile, wherein an antenna cover is fixed on the existing antenna base.   2. The mount antenna for a roof of an automobile according to claim 1, wherein the flat antenna element is made of a metal plate having a large area formed in accordance with the shape of the antenna cover.   2. The mount antenna for a roof of an automobile according to claim 1, wherein the flat antenna element is formed by stacking a plurality of metal plates formed in accordance with the shape of the antenna cover with a plurality of gaps therebetween.   In connecting the flat antenna element and the short-axis coil antenna element, the metal plate located at the lowermost end constituting the flat antenna element and the tip of the short-axis coil antenna element are connected by a connecting means. The mount antenna for a roof of an automobile according to any one of claims 1 to 3.

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