JP2005286692A - Communication apparatus and mount method of antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mount method of an antenna capable of not weakening a radiation radio wave, facilitating the assembling, and preventing a communication apparatus from being damaged. <P>SOLUTION: In an on-vehicle apparatus including: a housing 11; and a multi-element antenna 15 including directors 12, a radiator 13 and a reflector 14 arranged in the housing 11, the housing 11 has a housing main body 11A and a front panel 11B, the director 12 arranged at a position most remotely apart from the reflector 14 at least among the directors 12 is arranged in the vicinity of a rear side of the front panel 11B, and the radiator 13 is arranged in the housing main body 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a communication device and an antenna mounting method, and more particularly, to a communication device having an antenna built in a housing and an antenna mounting method.

2. Description of the Related Art Conventionally, in a vehicle-mounted device, when a communication function is provided, a device in which a communication antenna is built in a housing is known (see, for example, Patent Document 1).
FIG. 6 is a top view for explaining an outline of arrangement in a housing of a conventional vehicle-mounted device.
In such an in-vehicle device 100, when the transceiver 101 and the communication antenna 102 are provided in the housing, the communication antenna is connected to the front panel (decorative panel) 103 of the in-vehicle device 100 as shown in FIG. The transmitter / receiver 101 is connected to the transmitter / receiver 101 by a coaxial cable 104.
With this configuration, radio waves can be easily emitted, and wireless communication with the outside can be easily performed.
JP-A-9-261749

FIG. 7 is an explanatory diagram (part 1) of a conventional problem.
However, depending on the in-vehicle device, as shown in FIG. 7, the communication antenna 102 cannot always be disposed at a position close to the surface of the housing. In such a case, the front panel (decorative panel) 103 is used. Has a problem that the radio wave radiated from the communication antenna 102 through the front panel 103 is weakened.

FIG. 8 is an explanatory diagram (part 2) of a conventional problem.
In addition, when the communication antenna 102 is arranged in the front panel 103, the decorative panel is often attached last in the manufacturing process, so that the state shown in FIG. As shown in FIG. 8, there is a problem that the coaxial cable 104 connected to the communication antenna 102 is bent and interferes with the work.

FIG. 9 is an explanatory diagram (part 3) of the conventional problem.
In addition, as shown in FIG. 9, when the vehicle-mounted device has the front panel unit 105 that can be opened and closed, in order to ensure wireless communication, when the communication antenna 102 is disposed in the front panel unit 105, Since the coaxial cable 104 is bent each time the front panel unit 105 is opened and closed, the coaxial cable 104 may be damaged due to metal fatigue or the like depending on how the coaxial cable 104 of the communication antenna 102 is handled. .
Therefore, an object of the present invention is to facilitate assembly work and prevent damage to the apparatus without weakening radiated radio waves even when the in-vehicle communication apparatus includes a transceiver and a communication antenna. A communication device and an antenna mounting method are provided.

  In order to solve the above-described problem, the communication device includes a housing and a multi-element antenna including a director, a radiator, and a reflector disposed in the housing. A waveguide having a body main body and a front panel, and disposed at least at a position farthest from the reflector among the waveguides, is disposed in the vicinity of the back surface of the front panel, and the radiator is the housing. It is arranged in the body body.

In this case, the waveguide and the reflector other than those arranged near the back surface of the front panel may be arranged in the casing body.
Further, a transmitter / receiver that is connected to the radiator via a feeder line and that transmits / receives wirelessly to / from an external communication device may be provided in the housing body.

Further, the front panel may be provided at a position considered to face an open space when the communication device is installed.
Furthermore, the front panel in which the director is disposed near the back surface may be formed as a front panel.
The director, the radiator, and the reflector may be arranged in parallel at a predetermined distance from each other on a virtual plane including a predetermined radio wave radiation direction.

  And a multi-element antenna having a director, a radiator, and a reflector disposed in the housing, wherein an antenna mounting method for mounting the multi-element antenna is at least the waveguide. A waveguide disposed at a position farthest from the reflector among the radiators is disposed in the vicinity of the back surface of the front panel constituting the casing, and the radiator is disposed in the casing main body constituting the communication device. It is characterized by being arranged in.

In this case, you may make it arrange | position the director other than arrange | positioned in the back surface vicinity of the said surface panel, and a reflector in the said housing | casing main body.
In addition, a transmitter / receiver that wirelessly transmits / receives data to / from an external communication device may be disposed in the housing body, and the radiator may be connected to the transmitter / receiver via a feeder line.

  According to the present invention, radiated radio waves are not weakened, assembly work is facilitated, and damage to the apparatus can be prevented.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a principle explanatory diagram for explaining a method of mounting an antenna of a vehicle-mounted device according to the embodiment.
The in-vehicle device 10 includes a housing 11 and a multi-element antenna 15 having a waveguide 12, a radiator 13, and a reflector 14 disposed in the housing 11.
The housing 11 has a housing body 11A and a front panel (surface panel) 11B configured as a decorative panel.

Here, the director 12 has a function of guiding a radio wave from the outside to the radiator 13 or radiating a radio wave from the radiator 13 in a predetermined radiation direction with a predetermined directivity, and the front panel 11B. It is arrange | positioned in the back surface vicinity.
Further, the radiator 13 is arranged in the housing body 11A and radiates a radio wave by receiving power from a transmitter / receiver 16 described later, or a radio wave guided by the director 12 or the radiator 13 It has the function of collecting the induced radio waves and sending them to the transceiver 16 side.
The reflector 14 is disposed in the housing body 11 </ b> A and has a function of reflecting radio waves to the radiator 13 side and blocking radio waves from the side opposite to the radiator 13.

Further, a transmitter / receiver 16 that performs wireless transmission / reception with an external communication device is disposed in the housing main body 11A. The transmitter / receiver 16 is connected to the radiator 13 via a coaxial cable 17 serving as a feeder line. Is connected.
In this case, the multi-element antenna 15 having the director 12, the radiator 13, and the reflector 14 functions as a so-called three-element Yagi / Uda antenna that is a directional antenna.
Therefore, as shown in FIG. 1, the radio wave radiation pattern includes a main lobe ML from the radiator 13 toward the director 12 and a side lobe from the radiator toward the reflector 14 (Side Lobe). ) SL is observed.

  In this case, the director 12, the radiator 13, and the reflector 14 are arranged on a virtual plane including a predetermined radio wave radiation direction, that is, a radio wave radiation direction represented by a main lobe, as a spatial arrangement in the operating state. Therefore, the waveguide 12 can be separately attached to the front panel 11B at the time of assembly.

  Further, since the radiator 13 that needs to be fed, that is, connected to the transmitter / receiver 16 and the coaxial cable 17 is disposed in the housing body 11A, wiring work of the coaxial cable 17 at the time of attaching the front panel 11B does not occur. Therefore, the work can be facilitated and there is no fear of cable breakage. Even when the front panel can be freely opened and closed, the spatial arrangement of the director 12, the radiator 13 and the reflector 14 at the time of opening and closing is considered, or the radiator 13 and the reflector 13 are reflected at the sacrifice of directivity. If the structure which radiates | emits only with the device 14 is taken, the coaxial cable 17 will not be bent.

Next, more specific antenna mounting will be described with reference to FIGS.
FIG. 2 is a partially transparent top view for explaining the arrangement of the multi-element antenna. FIG. 3 is a partially transparent perspective view for explaining the arrangement of the multi-element antenna. FIG. 4 is a partially transparent front view for explaining the multi-element antenna arrangement. FIG. 5 is a partially transparent side view for explaining the multi-element antenna arrangement.
As shown in FIG. 2, as an example of this embodiment, each of the director 12, the radiator 13, and the reflector 14 has half the wavelength λ of the radio wave used for communication, that is, a length of λ / 2. ing.
The distance between the director 12 and the radiator 13 is, for example, 0.15λ.

The distance between the radiator 13 and the reflector 14 is, for example, 0.2λ.
In FIG. 2, the director 12 is disposed in the vicinity of the back surface of the front panel, and the radiator 13 and the reflector 14 are disposed in the housing body 11A.
The transceiver 16 and the radiator 13 are connected via a coaxial cable 17, and the radiator 13 is supplied with power by the transceiver 16.

As shown in FIGS. 3, 4 and 5, the director 12, the radiator 13 and the reflector 14 are represented by a predetermined radio wave radiation direction, that is, a main lobe, as a spatial arrangement of each other in the operating state. Are arranged in parallel at the predetermined distance described above on a virtual plane P1 including the radio wave radiation direction RD.
Therefore, it is possible to transmit and receive radio waves with a predetermined directivity.
As described above, according to the present embodiment, even when a power feeding element of a communication antenna, that is, a radiator is arranged in the housing main body 11A of the in-vehicle device 10, strong radio waves with high directivity are transmitted outside the device. Can be emitted.

  In addition, since it is not necessary to supply power to the surface panel 11B side that is separate from the casing body 11A, it is not necessary to connect a power supply cable such as a coaxial cable to the surface panel 11B side, and workability during assembly is improved. Even if the structure is such that the front panel can be opened and closed, the power feeding cable is not bent and is not broken due to metal fatigue or the like.

In the above description, a three-element multi-element antenna having one director is used as an example. However, even in the case of a multi-element antenna having four or more elements having a plurality of directors, at least a plurality of It is possible to apply in the same way if the wave guide placed at the position farthest from the reflector is placed near the back surface of the front panel and the radiator is placed in the housing body. It is. According to this configuration, it becomes possible to sharpen the directivity.
Furthermore, the present invention can be applied to a case where the reflector is composed of a plurality of elements.

  In the above description, the case of the front panel as the front panel has been described. However, the antenna is provided at any position as long as it is in the vicinity of the back side of the front panel that faces the open space when the communication device is installed. It is also possible.

In the above description, the radiator and the transmitter / receiver are connected by the coaxial cable. However, the radiator and the reflector are formed on the substrate of the transmitter / receiver, and the radiator is configured to be fed by the wiring pattern. Is also possible.
The dimensions of the elements of the director, radiator, and reflector in the above description, and the spatial arrangement of each element including the distance between each element are examples, and can be appropriately changed according to the frequency used and the purpose of the transceiver It is.

  In the above description, a transceiver has been described as an example of a communication device. However, the present invention can be similarly applied to either a transmitter or a receiver.

It is principle explanatory drawing for demonstrating the mounting method of the antenna of the vehicle equipment of embodiment. It is a partially transparent top view for explaining the arrangement of multi-element antennas. It is a partially transparent perspective view for description of multi-element antenna arrangement. It is a partially transparent front view for description of multi-element antenna arrangement. It is a partially transparent side view for description of multi-element antenna arrangement. It is an arrangement | positioning outline explanatory top view in the housing | casing of the conventional vehicle equipment. It is explanatory drawing (the 1) of the conventional problem. It is explanatory drawing (the 2) of the conventional problem. It is explanatory drawing (the 3) of the conventional problem.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Vehicle equipment, 11 ... Housing | casing, 11A ... Housing | casing main body, 11B ... Front panel (surface panel), 12 ... Waveguide, 13 ... Radiator, 14 ... Reflector, 15 ... Multi-element antenna, 16 ... Transceiver.

Claims (9)

In a communication device having a housing and a multi-element antenna having a director, a radiator and a reflector disposed in the housing,
The housing has a housing body and a surface panel,
At least the waveguide disposed at a position farthest from the reflector among the waveguides is disposed near the back surface of the front panel,
The communication device according to claim 1, wherein the radiator is disposed in the housing body. The communication device according to claim 1.
The communication device, wherein the waveguide and the reflector other than those arranged near the back surface of the front panel are arranged in the casing body. In the communication apparatus in any one of Claim 1 or Claim 2,
A communication apparatus is provided in the housing body, wherein a transceiver is connected to the radiator via a feeder line and wirelessly transmits and receives to / from an external communication device. The communication device according to any one of claims 1 to 3,
The said surface panel is provided in the position considered to face open space at the time of installation of the said communication apparatus, The communication apparatus characterized by the above-mentioned. The communication apparatus according to any one of claims 1 to 4,
The front panel in which the director is disposed in the vicinity of the back surface is formed as a front panel. The communication device according to any one of claims 1 to 5,
The communication device, wherein the director, the radiator, and the reflector are arranged in parallel at a predetermined distance from each other on a virtual plane including a predetermined radio wave radiation direction. In a communication device having a housing and a multi-element antenna having a director, a radiator and a reflector disposed in the housing, in the antenna mounting method for mounting the multi-element antenna,
A waveguide disposed at a position farthest from the reflector at least among the waveguides is disposed in the vicinity of the back surface of the front panel constituting the housing,
A communication device, wherein the radiator is arranged in a housing body constituting the communication device. In the mounting method of the antenna of Claim 7,
A method for mounting an antenna, comprising: arranging a waveguide and a reflector other than those disposed near a back surface of the front panel in the housing body. In the mounting method of the antenna of Claim 7 or Claim 8,
A method of mounting an antenna, comprising: a transmitter / receiver that wirelessly transmits / receives data to / from an external communication device in the housing body; and the radiator is connected to the transmitter / receiver through a feeder.

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