JP2005295398A - Antenna device and anti-noise method of antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device and the anti-noise method of an antenna which can reduce a part material cost and man-hour, and which can prevent bending of cables and stress upon bending. <P>SOLUTION: An antenna device 100 is provided with an antenna body 12, and a coaxial cable 11 connecting the antenna body 12 to a signal processing device which processes signals received from the antenna body 12. The coaxial cable 11 is provided with a shield tap 1. The shield tap 1 is provided with a connector 2 connected and fixed to a shield 11b of the coaxial cable 11 and an attaching portion 3 connected and fixed to the earth. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna device and an antenna noise countermeasure method, and more particularly to an in-vehicle antenna device and an antenna noise countermeasure method.

  Conventionally, as this type of antenna device, there is one disclosed in Patent Document 1. The antenna disclosed in Patent Document 1 is a TV. Through a coaxial cable, a plurality of antennas such as FM antennas, GPS antennas, etc. are connected to the antenna main body, and a branching circuit having a plurality of terminals such as a power terminal, a GPS terminal, a TV terminal, and an FM terminal is connected via a coaxial cable. Connected. Specifically, the antenna unit according to this prior art is used as an antenna outside the vehicle and is connected to a branching circuit via a single cable, and this branching circuit is connected to a GPS processing device. The antenna unit includes an antenna body, a GPS antenna, and a TV broadcast and FM broadcast antenna having a plurality of systems (hereinafter referred to as a TV / FM antenna), and the GPS antenna and the TV / FM antenna. Is integrally connected to the antenna body.

  The antenna main body has a synthesizing means for synthesizing the GPS signal received by the GPS antenna and the TV signal / FM signal received by the TV / FM antenna, and the signal synthesized by the synthesizing means is separated via a cable. To the wave circuit. The demultiplexing circuit has a power supply terminal that receives a power supply voltage from the GPS processing device, and supplies the received power supply voltage to the antenna unit via a cable. The demultiplexing circuit demultiplexes the synthesized signal and outputs a GPS signal, a TV signal, and an FM signal from the GPS terminal, the TV terminal, and the FM terminal, respectively.

  The antenna body includes a booster connected to the TV / FM antenna, a low noise amplifier (hereinafter abbreviated as LNA) connected to the GPS antenna, a mixer for mixing the booster output and the LNA output. A noise filter that removes noise (in this case, GPS signal, TV signal, and FM signal) superimposed on the power supply voltage on the cable and extracts only the power supply voltage, and a fluctuating power supply voltage extracted from the noise filter And a booster and a voltage regulator that outputs a predetermined voltage supplied to the LNA.

  The mixer serves as a combining means for combining the GPS signal and the TV signal / FM signal. The noise filter includes a series circuit of a coil L and a capacitor C connected between the cable and the ground.

  The antenna unit according to the prior art has an advantage that the antenna unit can be installed at a predetermined location of the automobile because the GPS antenna and the TV / FM antenna are integrally connected to the antenna body.

  In such an antenna unit, when receiving from the antenna via the coaxial cable, noise from the antenna body may be picked up. As a countermeasure, as shown in FIG. For example, as shown in FIG. 8, a method of attaching a ferrite core in the form of a GND, or a method of GND connection by direct soldering from a coaxial cable is performed.

  FIG. 7 shows a state where the ferrite core 20 is attached to the coaxial cable 11. FIG. 8 shows a state in which a part of the outer skin 11a made of an insulating material such as a synthetic resin of the coaxial cable 11 is removed, and a portion where the outer conductor 11b for shielding is exposed except for the outer skin 11a is a set plate or the like. Is to be soldered.

  However, since the ferrite core shown in FIG. 7 is expensive and large, it has been a defect in the wiring with reduced base.

  Further, in the case of the soldering shown in FIG. 8, there is a drawback that disconnection occurs when stress such as bending is applied.

JP-A-8-204442

  Therefore, the technical problem of the present invention is to provide an antenna device that can reduce the parts material cost and man-hours, and a noise countermeasure method for the antenna.

  Another technical problem of the present invention is to provide an antenna device and an antenna noise countermeasure method capable of avoiding cable bending and bending stress.

  According to the present invention, an antenna device comprising an antenna body (12) and a cable (11) for connecting between the antenna body (12) and a signal processing device for processing signals received from the antenna body (12). In (100), the cable (11) includes a shield metal fitting (1), and the shield metal fitting (1) is connected to the connection portion (2) connected and fixed to the shield portion of the cable (11), and connected to the ground. An antenna device (100) is provided that includes an attachment portion (3) for fixing.

  According to the present invention, in the antenna device (100), the cable (11) is a coaxial cable (11) including an outer conductor (11b), and the connecting portion (2) of the shield metal fitting (1). ) Has a cylindrical shape, the attachment portion (3) has a plate shape extending from the connection portion (2), and the connection portion (2) is exposed to a part of the coaxial cable (11). An antenna device (100) characterized by being caulked and mounted so as to cover the conductor (11b) is obtained.

  Moreover, according to this invention, the said antenna device (100) WHEREIN: The said mounting part (3) is equipped with the screw hole (4), The antenna device (100) characterized by the above-mentioned is obtained.

  According to the present invention, any one of the antenna devices (100) includes a conductive cylindrical member (7) mounted around the outer conductor (11b), and the connecting portion (2) An antenna device (100) characterized by being caulked and mounted so as to cover the exposed outer conductor (11b) through a cylindrical member (7) is obtained.

  Moreover, according to this invention, the antenna device (100) characterized by being mounted in a vehicle in the said any one antenna device (100).

  In addition, according to the present invention, the antenna main body (12) and the cable (11) for connecting the antenna main body (12) and a signal processing device for processing a signal received from the antenna main body (12) are provided. A noise countermeasure method for an antenna device (100), comprising: a shield metal fitting (1) comprising an attachment portion (3) and a connection portion (2) for connecting and fixing to a ground to a shield portion of the cable (11) An antenna noise countermeasure method characterized in that the connection portion (2) is fixedly connected.

  According to the present invention, in the noise suppression method for the antenna, the cable (11) is a coaxial cable (11) including an outer conductor (11b), and the connection portion (2) of the shield metal fitting (1). ) Has a cylindrical shape, the attachment portion (3) has a plate shape extending from the connection portion (2), and the connection portion (2) is exposed to a part of the coaxial cable (11). An antenna noise countermeasure method characterized by caulking and mounting so as to cover the conductor (11b) can be obtained.

  According to the present invention, in the antenna noise countermeasure method, the antenna noise countermeasure method characterized by using the shield fitting (1) provided with a screw hole (4) in the mounting portion (3). can get.

  According to the invention, in any one of the antenna noise reduction methods, the conductive cylindrical member (7) mounted around the outer conductor (11b) is mounted, and the connection portion (2) is mounted. The antenna noise countermeasure method is characterized in that the antenna is caulked so as to cover the exposed outer conductor (11b) through the cylindrical member (7).

  Furthermore, according to the present invention, in any one of the antenna noise countermeasure methods, an antenna noise countermeasure method characterized by being used in a vehicle can be obtained.

  It should be noted that the reference numerals in the parentheses are simply added for easy understanding of the present invention, and of course do not limit the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the antenna apparatus which can reduce component material cost and a man-hour, and the noise countermeasure method of the antenna can be provided.

  In addition, according to the present invention, it is possible to provide an antenna device and an antenna noise countermeasure method that can avoid bending and bending stress of a cable.

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

  FIG. 1 is a plan view showing an antenna apparatus according to a first embodiment of the present invention. FIG. 2 is a front view of the antenna device of FIG. FIG. 3 is an enlarged view of a portion A in FIG. 4A, 4B, and 4C are partially enlarged perspective views sequentially showing assembly of the antenna device of FIGS.

  1 and 2, an antenna device 100 according to a first embodiment of the present invention includes an antenna body 12 having a GPS antenna, and a coaxial cable 11 drawn from the antenna body 12, and a coaxial cable. An attachment portion 13 for connecting to the signal processing device is provided at the tip of 11.

  In the middle of the coaxial cable 11, a cylindrical earth metal fitting 1 having a cylindrical connection portion 2 provided on one end side is attached so as to cover a part of the cable. The ground metal fitting 1 is provided with a mounting portion 3 made of a plate piece extending from the connection portion 2 further outward in the radial direction of the cable. A screw hole 4 is provided near the tip of the mounting portion 3.

  As will be described in detail below, the connecting portion 2 is attached and fixed to the coaxial cable by caulking.

  Next, a method for attaching the grounding metal fitting 1 to the coaxial cable 11 will be described.

  Referring to FIG. 4A, the outer conductor 11 b of the coaxial cable 11 with the outer skin 11 a made of an insulating material stripped is exposed at the intermediate portion of the coaxial cable 11. As is well known, the outer conductor 11b is a conductor that forms a shield, and is usually composed of thin conductive wires knitted into a cylindrical mesh shape. The connecting portion 2 having an opening is inserted into the exposed portion of the outer conductor 11b, and the grounding metal 1 is mounted so that the exposed outer conductor 11b of the coaxial cable is positioned in the cylinder of the connecting portion 2.

  Next, as shown in FIG. 4 (b), the jig 6 is applied to a part of the outer periphery, and a force is applied as shown by an arrow 7 to crimp.

  As shown in FIG. 4 (c), the opening is blocked, and a recess 5 is formed on the outer periphery of the connecting portion in the direction intersecting the axial direction. As a result, the grounding metal 1 is connected to the outer conductor 11 b of the coaxial cable 11. It is firmly fixed to the exposed part.

  The ground metal fitting 1 is attached by screwing it to a desired ground portion of a vehicle (not shown) through a screw hole 4 provided in the attachment portion 3.

  FIG. 5 is a side view showing a grounding fitting of the antenna device according to the second embodiment of the present invention. FIGS. 6A, 6B, 6C, and 6D are partially enlarged perspective views sequentially showing the assembly of the antenna device according to the second embodiment of the present invention.

  The antenna device according to the second embodiment of the present invention has substantially the same configuration as the antenna device according to the first embodiment shown in FIGS. 1 and 2 except that the shape of the grounding metal and the mounting method thereof are different. I have. Parts having the same names as those in the first embodiment are denoted by the same reference numerals.

  Referring to FIG. 5, the connection portion 2 of the ground metal fitting 1 does not have a cut in which a tip bent in a cylindrical shape and a base portion are previously joined by welding or the like, and further, a hole having substantially the same thickness as the coaxial cable 11. It is formed in the cylindrical shape provided with the part.

  A method for attaching the grounding metal fitting 1 to the coaxial cable 11 will be described with reference to FIGS.

  Referring to FIG. 6A, an outer conductor exposed portion 16 is formed in the middle portion of the coaxial cable 11, and the outer conductor 11 b of the coaxial cable 11 with the outer skin 11 a made of an insulating material is stripped. As is well known, the outer conductor 11b is a conductor that forms a shield, and is usually composed of thin conductive wires knitted into a cylindrical mesh shape. The cylindrical member 7 made of a copper cylinder is passed in advance from one end side of the coaxial cable 11 so that the exposed portion of the outer conductor 11b is exposed, and the connecting portion 2 is also inserted from one end of the coaxial cable 11. Next, as shown in FIG. 6B, the cylindrical member 7 is slid to the position of the exposed external conductor 16 of the external conductor 11 b in the axial direction of the coaxial cable 11 indicated by the arrow 9.

  As shown in FIG. 6 (c), the ground metal fitting 1 is indicated by an arrow 14 so that the exposed portion 16 of the outer conductor of the coaxial cable 11 is located in the cylinder of the connection portion 2 of the ground metal fitting 1 and covers the cylindrical member 7. Slide it in the axial direction.

  Next, as shown in FIG. 6 (d), the jig 6 is applied to a part of the outer periphery, and the cylindrical member 7 and the connecting portion are both squeezed by applying force.

  Similar to that shown in FIG. 4 (c), a recess 5 in the direction intersecting the axial direction is formed on the outer periphery of the cylindrical portion of the connecting portion 2, whereby the grounding metal 1 is exposed to the outer conductor 11 b of the coaxial cable 11. Further, it is firmly fixed via the cylindrical member 7.

  As in the first embodiment described above, the grounding metal fitting 1 is attached by screwing it to a desired earthing part of a vehicle (not shown) via a screw hole 4 provided in the attachment part 3. .

  INDUSTRIAL APPLICABILITY The antenna device and the antenna noise countermeasure method according to the present invention can be applied to the noise countermeasure and noise countermeasure of the vehicle GPS receiver.

It is a top view which shows the antenna apparatus by embodiment of this invention. It is a front view of the antenna apparatus of FIG. FIG. 3 is an enlarged view of a portion A in FIG. 2. (A), (b), and (c) are the partial expansion perspective views which show assembly of the antenna apparatus of FIG.1 and FIG.2 in order. It is a side view which shows the earth metal fitting of the antenna device by the 2nd Embodiment of this invention. (A), (b), (c), and (d) are the partial expansion perspective views which show assembly of the antenna apparatus by the 2nd Embodiment of this invention in order. It is a fragmentary perspective view which mainly shows the ferrite core part which shows the noise countermeasure method using the ferrite core of the conventional antenna apparatus. It is a fragmentary perspective view which mainly shows the soldering part which shows the noise countermeasure method by the GND connection method by the direct soldering of the conventional antenna apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground metal fitting 2 Connection part 3 Attachment part 4 Screw hole 6 Jig 7 Cylindrical member 9,14 Arrow 11 Coaxial cable 11a Outer skin 11b External conductor 12 Antenna main body 13 Attachment part 16 External conductor exposed part 20 Ferrite core 100 Antenna apparatus

Claims (10)

In an antenna device comprising an antenna body, and a cable connecting between the antenna body and a signal processing device for processing a signal received from the antenna body,
The antenna device according to claim 1, wherein the cable includes a shield metal fitting, and the shield metal fitting includes a connection portion that is connected and fixed to a shield portion of the cable, and an attachment portion that is connected and fixed to the ground.   2. The antenna device according to claim 1, wherein the cable is a coaxial cable having an outer conductor, the connection portion of the shield metal fitting has a cylindrical shape, and the attachment portion has a plate shape extending from the connection portion. The antenna device is characterized in that the connecting portion is attached by caulking so as to cover the outer conductor exposed at a part of the coaxial cable.   The antenna device according to claim 2, wherein the attachment portion includes a screw hole.   4. The antenna device according to claim 1, further comprising: a conductive cylindrical member mounted around the outer conductor, wherein the connection portion is exposed through the cylindrical member. An antenna device, wherein the antenna device is attached by caulking so as to cover an external conductor.   The antenna device according to any one of claims 1 to 4, wherein the antenna device is mounted on a vehicle.   A noise countermeasure method for an antenna device comprising an antenna body and a cable for connecting between the antenna body and a signal processing device for processing a signal received from the antenna body, wherein the shield portion of the cable is connected to ground. An anti-noise method for an antenna, characterized in that the connecting portion of a shield metal fitting having a mounting portion and a connecting portion for fixing is connected and fixed.   The antenna noise suppression method according to claim 6, wherein the cable is a coaxial cable having an outer conductor, the connection portion of the shield metal fitting has a cylindrical shape, and the attachment portion extends from the connection portion. A method for noise reduction of an antenna, comprising a plate shape, and caulking and mounting the connecting portion so as to cover the outer conductor exposed at a part of the coaxial cable.   The antenna noise countermeasure method according to claim 7, wherein the shield metal fitting provided with a screw hole in the mounting portion is used.   The antenna noise reduction method according to any one of claims 6 to 8, wherein a conductive cylindrical member mounted around the outer conductor is mounted, and the connection portion is interposed via the cylindrical member. A method for noise reduction of an antenna, wherein the antenna is caulked so as to cover the exposed outer conductor. The antenna noise countermeasure method according to any one of claims 6 to 9, wherein the antenna noise countermeasure method is used for a vehicle.

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