JP2007134869A - Antenna housing box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna housing box capable of shielding leakage of an electromagnetic wave emitted from an antenna. <P>SOLUTION: The antenna housing box 10 for housing and arranging the antenna 30 to which a mobile phone located in an electromagnetic wave shield telephone box 1 is connected via a connector and a cable 8, includes a box body 11 a transmission reception side of which is open and which is made of an aluminum-made member being a conductive substance, a spacer 12 made of, e.g. foamed polyurethane is arranged inside the box body 11 and a resistance sheet 3 is covered on the surface of the spacer 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an antenna storage box, and more particularly to an antenna storage box in which an antenna connected via a cable and a connector to which a mobile phone in an electromagnetic shielding telephone box is connected are stored.

  While mobile phones can transmit and receive anywhere within the reach of radio waves, it is convenient, but electromagnetic waves radiated from mobile phones may adversely affect precision equipment and medical equipment. There is a place where use is prohibited. For example, the use of mobile phones is prohibited in hospitals, theaters, hotel lobbies, and the like.

  As a means to prevent electromagnetic wave radiation associated with the use of a mobile phone, a person who uses the mobile phone enters a box body and a door that divides a space for using the mobile phone and surrounds the box body As the partitioning part, a structure having a radio wave shielding part for preventing radio waves emitted from the mobile phone from leaking to the outside is known.

The telephone box configured as described above is provided with a connector to which a mobile phone is connected, and the connector and an external antenna are connected via a cable (for example, see Patent Document 1).
JP 2002-208884 (Claims, paragraph number 0011, FIGS. 1 to 3, FIGS. 5 to 8)

  By the way, in order to facilitate installation of an external antenna, it is generally convenient to install an antenna in a window portion in a building. However, since the antenna radiates electromagnetic waves, there is a possibility of adversely affecting a person using a medical device or a pacemaker in a building near the antenna installation part.

  This invention is made in view of the said situation, and makes it a subject to provide the antenna storage box which enabled it to shield the leakage of the electromagnetic waves radiated | emitted from an antenna.

  In order to solve the above-described problems, the present invention provides an antenna storage box for storing and arranging an antenna connected via a cable and a connector to which a mobile phone in an electromagnetic wave shielding telephone box is connected. According to the first aspect of the present invention, a spacer is disposed on the inner surface of the box body so as to have a function of absorbing electromagnetic waves, and the surface of the spacer. A resistance sheet is attached to the substrate.

  By comprising in this way, the electromagnetic waves radiated | emitted from an antenna can be attenuated and absorbed by a resistance sheet and a spacer.

  The invention according to claim 2 is a non-conductive method in which a magnetic sheet that absorbs electromagnetic waves is attached to the inner surface of the back portion of the box body facing the opening, and the antenna is attached to the surface side of the magnetic sheet. A material plate material is disposed, and a spacer is disposed on the inner surface of the side of the box body so as to absorb electromagnetic waves, and a resistance sheet is attached to the surface of the spacer. To do.

  With this configuration, the electromagnetic wave radiated from the antenna is not reflected by the non-conductive plate material, and directivity can be given to the transmission / reception side. The electromagnetic wave is absorbed by the magnetic sheet at the back portion of the box body, and is attenuated and absorbed by the resistance sheet and the spacer at the side portion other than the back portion.

  In addition, the invention according to claim 3 attaches a magnetic sheet that absorbs electromagnetic waves to the inner surface of the back portion facing the opening in the box body, and on the surface of the magnetic body sheet and the inner surface of the side portion of the box body, A spacer is provided so as to have a function of absorbing electromagnetic waves, a resistance sheet is attached to the surface of the spacer, and a nonconductive material plate for attaching the antenna is provided in the box body. It is characterized by.

  With this configuration, the electromagnetic wave radiated from the antenna is not reflected by the non-conductive plate material, and directivity can be given to the transmission / reception side. In addition, the electromagnetic wave is absorbed by the magnetic sheet and is attenuated and absorbed by the resistance sheet and the spacer.

  In the present invention, it is preferable to project an outward flange formed of a conductive material at the opening of the box body. In this way, by projecting an outward flange formed of a conductive material at the opening of the box body, it is possible to prevent electromagnetic waves radiated to the transmission / reception side from wrapping around the rear side of the box body. it can.

  Further, it is preferable that the opening of the box body is covered with a cover member formed of a non-conductive substance. In this case, the non-conductive substance can be formed of a synthetic resin or glass (claim 8). Thus, by covering the opening of the box body with a cover member formed of a nonconductive material formed of synthetic resin or glass, the directivity to the electromagnetic wave transmission / reception side is not affected. Intrusion of dust etc. into the box body can be prevented.

  The conductive material may be formed of a conductive metal such as aluminum or iron, and the spacer may be formed of a foamed synthetic resin. By comprising in this way, the leakage of the electromagnetic waves radiated | emitted from an antenna other than the transmission / reception side can be shielded reliably.

  In addition, the invention according to claim 6 is characterized in that the electromagnetic wave attenuation amount is 10 dB or more in the frequency band of 800 MHz to 2.2 GHz over the hemispherical spatial range on the back side facing the opening in the box body. To do.

  With this configuration, the electromagnetic wave attenuation can be attenuated to a level equal to or less than the PHS radio wave transmission output of 80 mW.

  According to this invention, since it is configured as described above, the following effects can be obtained.

  (1) According to the first aspect of the invention, the electromagnetic wave radiated from the antenna can be attenuated and absorbed by the resistance sheet and the spacer, so that the leakage of the electromagnetic wave radiated from the antenna to the side other than the transmission / reception side is shielded. can do.

  (2) According to the second and third aspects of the invention, the electromagnetic wave radiated from the antenna can be absorbed by the magnetic sheet, attenuated by the resistance sheet and the spacer, and can be absorbed by the antenna. In addition to the above (1), the directivity of the antenna can be improved since the electromagnetic wave to be transmitted is not reflected by the non-conductive material plate and can have directivity on the transmission / reception side.

  (3) According to the invention described in claim 4, since electromagnetic waves radiated to the transmission / reception side can be prevented from wrapping around the rear side of the box body, in addition to the above (1) and (2), The leakage of electromagnetic waves to the inside of the building can be shielded.

  (4) According to the fifth and eighth aspects of the invention, it is possible to prevent the entry of dust and the like into the box body without affecting the directivity of the electromagnetic wave to the transmission / reception side. In addition to (3) to (3), the performance of the antenna can be further prevented from being lowered, and the maintenance of the antenna storage box can be facilitated.

  (5) According to the invention described in claim 6, since the electromagnetic wave attenuation can be attenuated to a level equal to or less than 80 mW of the PHS radio wave transmission output, in addition to the above (1) to (4), an antenna is further provided. The influence of electromagnetic waves on a person using a medical device, a pacemaker, or the like on the shielding side of the storage box can be eliminated.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing a use state of an antenna storage box according to the present invention.

  As shown in FIG. 1, the telephone box 1 includes a floor panel 2, three wall panels 3, a door panel 4, and a ceiling panel 5, each of which includes a conductive material having an electromagnetic wave shielding function, such as an aluminum member. It is mainly composed of four conductive materials located between adjacent wall panels 3 and door panels 4, for example, columns 6 made of extruded aluminum, and columns 6 and wall panels. 3 and one end of the door panel 4 are connected in a conductive state.

  In the telephone box 1 configured as described above, a cable connection connector 7 that can be connected to a mobile phone of a different model is installed. The cable connection connector 7 is connected to the window portion of the building 9 via the antenna connection cable 8. The external antenna 30 accommodated in the antenna storage box 10 (hereinafter referred to as the storage box 10) according to the present invention installed in the middle of the antenna {specifically, a plurality of antennas of different models, but here one Will be described. }It is connected to the.

First Embodiment FIG. 2 is a perspective view showing a first embodiment of an antenna storage box according to the present invention, and FIG. 3 is a cross-sectional view of the antenna storage box.

  As shown in FIGS. 2 and 3, the storage box 10 includes a box body 11 made of a conductive material, for example, aluminum, whose surface on the transmission / reception side is open. A spacer 12 made of a foamed synthetic resin such as foamed polyurethane is disposed over the entire inner surface of the box body 11 and is formed on the surface of the spacer 12 with, for example, polyethylene terephthalate (PET) or paper. A resistance sheet 13 is attached. In this case, the thickness of the layer formed by the spacer 12 and the resistance sheet 13 is preferably set to a thickness that is approximately ¼ of the wavelength (λ) of the electromagnetic wave. This is generally referred to as a λ / 4 type absorber. Thus, by setting the thicknesses of the spacer 12 and the resistance sheet 13 to λ / 4, the electromagnetic waves radiated from the antenna 30 can be effectively reduced. Can be attenuated and absorbed.

  As shown in FIG. 3, the side wall portion constituting the box body 11 is formed of a hollow extruded shape member 14 made of aluminum, and the bottom portion constituting the box body 11, that is, the back portion facing the opening 15 of the box body 11. Is formed by an aluminum plate member 17 fitted in a mounting groove 16 formed by a pair of projecting pieces projecting from the lower inner wall of the hollow extruded shape member 14.

  The antenna 30 is attached to the central portion inside the storage box 10 configured as described above via the attachment member 18. In this case, the mounting plate 18a installed horizontally on the back of the box body 11 is fixed to the inner surface of the side portion by an angle-shaped holding member 19 fixed with a fixing screw (not shown), and the mounting member 18 is attached to the mounting plate 18a. The antenna 30 can be attached by attaching. A through hole 11a is provided in the lower side wall of the box body 11, and the antenna connection cable 8 is connected to the antenna 30 through the through hole 11a. At this time, the gap between the through hole 11a and the antenna connection cable 8 is closed with, for example, the aluminum foil 11b, so that leakage of electromagnetic waves to the outside can be surely prevented.

  According to the storage box 10 configured as described above, the electromagnetic wave radiated from the antenna 30 that flows toward the back side opposite to the transmission side is absorbed and shielded by the resistance sheet 13 and the spacer 12. Can do.

  As shown by a two-dot chain line in FIG. 3, it is preferable to cover the opening 15 of the box body 11 with a cover member 40 formed of a non-conductive substance such as synthetic resin or glass. Thus, by covering the opening 15 of the box body 11 with the cover member 40 formed of a non-conductive substance, the directivity of the electromagnetic wave radiated from the antenna 30 to the transmission / reception side is affected. In addition, it is possible to prevent the entry of dust and the like into the box body 11. Accordingly, it is possible to prevent the performance of the antenna 30 from being deteriorated and to facilitate maintenance of the storage box 10.

Second Embodiment FIG. 4 is a perspective view showing a second embodiment of the storage box 10A according to the present invention, and FIG. 5 is a cross-sectional view of the storage box 10A of the second embodiment.

  The storage box 10A of the second embodiment includes a box body 11 made of a conductive material such as aluminum having an opening on the transmitting and receiving side, and an outward flange 20 made of a conductive material such as aluminum in the opening 15 of the box body 11. It has. In this case, the outward flange 20 is formed by an angle member made of an aluminum extruded profile, and one piece 20a of the angle member is formed on the side wall of the box body 11 by a fixing member (not shown) such as a rivet. Fixed and attached.

  In the storage box 10A of the second embodiment, a magnetic material sheet 21 that absorbs electromagnetic waves is attached to the inner surface of the back portion of the box body 11 that faces the opening 15, and an antenna is provided on the surface side of the magnetic material sheet 21. A non-conductive material to which 30 is attached, for example, a synthetic resin plate 22 is disposed. Further, in the storage box 10A of the second embodiment, the spacer 12 formed of a nonconductive material such as foamed polyurethane is disposed over the entire inner surface of the side portion of the box body 11, and the surface of the spacer 12 is resisted. The sheet 13 is attached.

  In the second embodiment, the other parts are the same as those in the first embodiment, so the same parts are denoted by the same reference numerals and description thereof is omitted.

  According to the storage box 10 </ b> A configured as described above, the electromagnetic wave radiated from the antenna 30 is not reflected by the non-conductive material plate material 22, and directivity can be given to the transmission / reception side. The electromagnetic wave radiated from the antenna 30 is absorbed by the magnetic sheet 21 at the back of the box body 11 and is attenuated and absorbed by the resistance sheet 13 and the spacer 12 at the side other than the back.

  Also in the second embodiment, as shown by a two-dot chain line in FIG. 5, the opening 15 of the box body 11 is covered with a cover member 40 formed of a nonconductive material such as synthetic resin or glass. Is preferred. As a result, it is possible to prevent entry of dust or the like into the box body 11 without affecting the directivity of the electromagnetic wave radiated from the antenna 30 to the transmission / reception side, thereby preventing the performance of the antenna 30 from deteriorating. In addition, the maintenance of the storage box 10 can be facilitated.

  In the second embodiment, the other parts are the same as those in the first embodiment, so the same parts are denoted by the same reference numerals and description thereof is omitted.

Third Embodiment FIG. 6 is a perspective view showing a third embodiment of the storage box 10B according to the present invention, and FIG. 7 is a cross-sectional view of the storage box 10B according to the third embodiment.

  Similar to the second embodiment, the storage box 10B of the third embodiment includes a box body 11 and an outward flange 20 formed of a conductive material such as an aluminum member.

  In the storage box 10B of the third embodiment, a magnetic sheet 21 that absorbs electromagnetic waves is attached to the inner surface of the back portion of the box body 11 that faces the opening 15, and the surface of the magnetic sheet 21 and the box body 11 are bonded. A spacer 12 formed of a non-conductive material, for example, a foamed synthetic resin such as foamed polyurethane, is disposed on the entire inner surface of the side portion of the cover, and a resistance sheet 13 is attached to the surface of the spacer 12. 11, a non-conductive material for attaching the antenna 30, for example, a plate 22 made of synthetic resin is disposed.

  In the third embodiment, the other parts are the same as those in the first and second embodiments. Therefore, the same parts are denoted by the same reference numerals and description thereof is omitted.

  According to the storage box 10 </ b> B configured as described above, the electromagnetic wave radiated from the antenna 30 is not reflected by the non-conductive material plate 22, and directivity can be given to the transmission / reception side. The electromagnetic wave radiated from the antenna 30 is absorbed by the magnetic sheet 21 at the back of the box body 11 and absorbed by the resistance sheet 13 and the spacer 12, and by the resistance sheet 13 and spacer 12 at the side other than the back. Absorbed.

  In the third embodiment as well, as shown by a two-dot chain line in FIG. 7, the opening 15 of the box body 11 is covered with a cover member 40 formed of a nonconductive material such as synthetic resin or glass. Is preferred. As a result, it is possible to prevent the entry of dust and the like into the box body 11 without affecting the directivity of the electromagnetic wave radiated from the antenna 30 to the transmission / reception side, thereby preventing the performance of the antenna 30 from deteriorating. In addition, the maintenance of the storage box 10 can be facilitated.

  In addition, although the case where the box main body 11 was formed with aluminum was demonstrated in the said embodiment, you may form the box main body 11 with conductive metals other than aluminum, for example, conductive metals, such as iron.

  Next, an experiment of radio wave shielding performance of the storage box according to the present invention will be described. First, in conducting the experiment of the radio wave shielding performance, first, an electromagnetic wave having a frequency of 800 MHz and 2200 MHz (2.2 GHz) band radiated from the antenna 30 connected to the radio wave transmitter is 45 mm around the circumference of the antenna 30 2 m away. Measure the strength of the electromagnetic field (the strength of the radio wave) by placing the receiver at the interval position. Next, as shown in FIG. 8A, the antenna 30 is arranged from the opening 15 side to the back side of the storage box 10 according to the present invention, and similarly, the frequencies 800 MHz and 2200 MHz radiated from the antenna 30 are arranged. A receiver is arranged at 45 ° intervals around the circumference of the (2.2 GHz) band electromagnetic wave 2 m away from the antenna 30 to measure the strength of the electromagnetic field (the strength of the radio wave). Then, when the difference (attenuation amount) was calculated, a result as shown in FIG. 8B was obtained. As a result, the electromagnetic wave attenuation can be 10 dB or more in the frequency range of 800 MHz to 2.2 GHz over the hemispherical space range {solid angle: 2π (steradian)} on the back side facing the opening in the box body 11.

  As a result of the above experiment, it has been found that the electromagnetic wave attenuation can be attenuated to a level equal to or less than the PHS radio wave transmission output of 80 mW.

It is a schematic perspective view which shows the use condition of the antenna storage box which concerns on this invention. It is a perspective view which shows 1st Embodiment of the antenna storage box which concerns on this invention. It is sectional drawing which shows 1st Embodiment of the antenna storage box which concerns on this invention. It is a perspective view which shows 2nd Embodiment of the antenna storage box which concerns on this invention. It is sectional drawing which shows 2nd Embodiment of the antenna storage box which concerns on this invention. It is a perspective view which shows 3rd Embodiment of the antenna storage box which concerns on this invention. It is sectional drawing which shows 3rd Embodiment of the antenna storage box which concerns on this invention. It is the schematic top view (a) which shows the arrangement | positioning state of the apparatus which tests electromagnetic wave shielding performance in the antenna storage box which concerns on this invention, and the graph (b) which shows the experimental result of electromagnetic wave shielding performance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telephone box 7 Cable connection connector 8 Antenna connection cable 10, 10A, 10B Antenna storage box 11 Box main body 12 Spacer 13 Resistance sheet 15 Opening part 20 Outward flange part 21 Magnetic material sheet 22 Antenna mounting plate 30 Antenna 40 Cover member

Claims (8)

An antenna storage box for storing and arranging an antenna connected via a cable and a connector to which a mobile phone in an electromagnetic shielding telephone box is connected,
It has a box body made of a conductive material with an open transmission / reception surface,
An antenna storage box, wherein a spacer is provided on the inner surface of the box body so as to have a function of absorbing electromagnetic waves, and a resistance sheet is attached to the surface of the spacer. An antenna storage box for storing and arranging an antenna connected via a cable and a connector to which a mobile phone in an electromagnetic shielding telephone box is connected,
It has a box body made of a conductive material with an open transmission / reception surface,
A magnetic material sheet that absorbs electromagnetic waves is attached to the back inner surface of the box body that faces the opening, and a plate made of a non-conductive material to which the antenna is attached is disposed on the surface side of the magnetic material sheet.
An antenna storage box, wherein a spacer is disposed on an inner surface of a side portion of the box body so as to have a function of absorbing electromagnetic waves, and a resistance sheet is attached to the surface of the spacer. An antenna storage box for storing and arranging an antenna connected via a cable and a connector to which a mobile phone in an electromagnetic shielding telephone box is connected,
It has a box body made of a conductive material with an open transmission / reception surface,
A magnetic sheet that absorbs electromagnetic waves is attached to the back inner surface of the box body facing the opening, and spacers are provided on the surface of the magnetic sheet and the side inner surfaces of the box body to have a function of absorbing electromagnetic waves. Along with the arrangement, a resistance sheet is attached to the surface of the spacer,
An antenna storage box, wherein a plate material made of a non-conductive material for mounting the antenna is disposed in the box body. The antenna storage box according to any one of claims 1 to 3,
An antenna storage box, wherein an outward flange portion made of a conductive material protrudes from an opening of the box body. The antenna storage box according to any one of claims 1 to 4,
An antenna storage box, wherein an opening of the box body is covered with a cover member formed of a nonconductive material. The antenna storage box according to any one of claims 1 to 5,
An antenna storage box, wherein an electromagnetic wave attenuation amount is 10 dB or more in a frequency band of 800 MHz to 2.2 GHz over a hemispherical space on the back side facing the opening in the box body. The antenna storage box according to any one of claims 1 to 3,
An antenna storage box, wherein the conductive material is a conductive metal such as aluminum or iron, and the spacer is a foamed synthetic resin. The antenna storage box according to claim 5,
An antenna storage box, wherein the non-conductive substance is synthetic resin or glass.

Images