JP2004319161A - Transmission line and transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission line and a transmission device of which flexibility is excellent and workability at the time of construction is superior. <P>SOLUTION: This is the transmission line 3 to transmit electric signals, and it is provided with the center conductor 7 formed in a sheet, outside conductors 9, 10 which are formed in sheets and which are arranged in two pieces and in parallel keeping a prescribed distance b from both faces of the center conductor, and dielectrics 8, 11 arranged in a gap between the outside conductors 9, 10 and the center conductor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the field of devices having a wireless communication function including home appliances in general, and a radio signal when a radio signal from a wireless device such as a wireless router is communicated by a wireless device such as a personal computer with a wireless LAN. The present invention relates to a transmission line and a transmission apparatus using the same.
[0002]
[Prior art]
FIG. 4 is a configuration diagram illustrating an example of a conventional transmission system.
[0003]
In FIG. 4, 100 is a building such as a building, 101 and 102 are rooms of the building 100, 103 is a wireless device (for example, a wireless router) placed in the room 101, 104 is an antenna of the wireless device 103, and 105 is a personal computer with a wireless LAN. , 106 is a partition wall separating the rooms 101 and 102, and N is a network such as the Internet.
[0004]
A radio signal transmitted from the wireless device 103 disposed in the room 101 via the antenna 104 is communicated by the personal computer 105 via the space of the room 101, the partition wall 106, and the space of the room 102. That is, the transmission path in FIG. 4 includes the space of the room 101, the partition wall 106, and the room 102. In the case of a radio signal transmitted through such a transmission path, a space loss in the rooms 101 and 102 and a wall loss in the partition wall 106 occur. This wall loss is the difference between the input electric field intensity E0 of the partition wall 106 and the output electric field intensity E1 of the partition wall 106, and varies depending on the material of the wall and the humidity, but is considered to be about 30 dB in an apartment. Here, if the transmission level of the wireless device is −10 dBm and the communication sensitivity of the personal computer 105 as a wireless signal communication device is −90 dBm, the personal computer 105 receives the radio signal from the wireless device 103 if the space loss is 50 dB or more. Can no longer communicate.
[0005]
As described above, since the partition wall 106 is provided between the one room 101 and the other room 102, there is a problem that the reception electric field strength in the other room 102 is extremely lowered and the personal computer 105 cannot be used. As a device for correcting this problem, for example, there is a non-powered radio wave repeater formed by arranging antennas in each room for communication and electrically connecting the antennas with coaxial cables, connectors, etc. (Patent Document) 1), by this non-powered radio wave repeater, radio waves received by one antenna are transmitted through a coaxial cable as a transmission line and radiated from the other antenna without being attenuated. Sufficient reception field strength can be maintained even in a room or outside.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-313022
[Problems to be solved by the invention]
However, the conventional transmission line uses a coaxial cable, and the coaxial cable has a certain thickness and diameter, so when installing in an existing building, make a hole in the wall or ceiling. And had the problem of poor workability.
[0008]
In this transmission line and transmission device, it is not necessary to make holes or the like in the wall surface or ceiling surface, and it is required to have excellent workability during construction.
[0009]
In order to satisfy this requirement, an object of the present invention is to provide a transmission line having good flexibility and excellent workability during construction, and a transmission device using the transmission line.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the transmission line of the present invention is a transmission line for transmitting an electrical signal, and the transmission line is formed from a central conductor formed in a flat plate shape and a predetermined shape from both sides of the central conductor formed in a flat plate shape. The outer conductor is disposed in parallel with a distance of 2 mm, and the dielectric is disposed in the gap between the outer conductor and the center conductor.
[0011]
As a result, a transmission line having good flexibility and excellent workability during construction can be obtained.
[0012]
In order to solve the above problems, a transmission apparatus according to the present invention includes the transmission line, a first antenna disposed at one end of the central conductor, and a second antenna disposed at the other end of the central conductor. It has the composition which has.
[0013]
Thereby, the transmission apparatus using the said transmission line is obtained.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The transmission line according to claim 1 of the present invention is a transmission line for transmitting an electrical signal, and the transmission line is formed from a center conductor formed in a flat plate shape and a predetermined shape from both sides of the center conductor formed in a flat plate shape. Two outer conductors arranged in parallel at a distance from each other and a dielectric disposed in a gap between the outer conductor and the center conductor are provided.
[0015]
With this configuration, a transmission line with a small transmission loss can be formed in a flat plate shape as a whole, so that it is excellent in flexibility and the transmission line can be passed through a narrow space such as a gap between a wall, a door, or a window. Has an effect.
[0016]
The transmission line according to claim 2 of the present invention is the transmission line according to claim 1, wherein the transmission line has a connection portion for electrically connecting the external conductors.
[0017]
With this configuration, the shielding effect is enhanced and the transmission efficiency can be increased.
[0018]
The transmission line according to claim 3 of the present invention is the transmission line according to claim 2, wherein the connecting portions are arranged at intervals of less than a quarter wavelength of the maximum wavelength of the electric signal to be transmitted. It is what.
[0019]
With this configuration, leakage of magnetic flux and electric field can be efficiently suppressed, the shielding effect can be enhanced, and therefore transmission efficiency can be enhanced.
[0020]
A transmission line according to a fourth aspect of the present invention is the transmission line according to the second or third aspect, wherein the connecting portion is constituted by a through hole.
[0021]
With this configuration, the connection portion can be easily provided.
[0022]
The transmission line according to claim 5 of the present invention is the transmission line according to any one of claims 1 to 4, wherein the transmission line has an outer peripheral portion in which a dielectric is disposed on the outer periphery of the outer conductor. It is.
[0023]
With this configuration, when the transmission line is disposed, the outer conductor of the transmission line is not in direct contact with metal or the like, and the characteristics of the transmission line can be easily maintained.
[0024]
A transmission line according to a sixth aspect of the present invention is the transmission line according to the first aspect, wherein an adhesive tape is attached to one of the long sides of the outer peripheral portion.
[0025]
With this configuration, the transmission line can be easily fixed to a mounting portion such as a wall via an adhesive tape.
[0026]
The transmission line according to claim 7 of the present invention is the transmission line according to claim 5 or 6, wherein the thickness of one long side of the outer peripheral portion is the thickness of the other long side of the outer peripheral portion. It was decided to make it thicker.
[0027]
With this configuration, the central conductor can be arranged at a position far from the mounting portion such as a wall, so that the electrical influence from the mounting portion can be reduced and the characteristic impedance of the transmission line can be stabilized. Has an effect.
[0028]
A transmission line according to an eighth aspect of the present invention is the transmission line according to the seventh aspect, wherein a tape-like electrical shield is disposed on one long side of the outer peripheral portion, and the electrical shield is provided. An adhesive tape is attached.
[0029]
With this configuration, the mounting portion such as a wall can be electrically shielded, so that the electrical influence from the mounting portion can be reduced and the characteristic impedance of the transmission line can be stabilized. .
[0030]
According to a ninth aspect of the present invention, in the transmission line according to the eighth aspect, the electrical shield is made of a material containing ferrite.
[0031]
With this configuration, the mounting portion such as the wall can be shielded electrically and magnetically, so that the electrical influence from the mounting portion can be further reduced, and the characteristic impedance of the transmission line can be further stabilized. Has the effect of being able to.
[0032]
The transmission line according to claim 10 of the present invention is the transmission line according to claim 8 or claim 9, wherein paper is disposed on the long side opposite to the long side to which the adhesive tape is attached. It is what.
[0033]
With this configuration, it becomes easy to paste wallpaper on the surface, and it is possible to avoid deteriorating the beauty. Also, because it is paper, the design can be written with paint or colored pencils.
[0034]
A transmission device according to an eleventh aspect of the present invention includes the transmission line according to any one of the first to tenth aspects, a first antenna disposed at one end of the central conductor, and the other end of the central conductor. And a second antenna disposed in the section.
[0035]
With this configuration, radio signals from a radio device arranged in one room can be transmitted through a transmission line with a small transmission loss, and the reception level at the radio signal receiving device arranged in the other room can be increased. Has the effect of being able to. The arrangement of the center conductor at the end includes not only direct connection to the antenna but also connection between the end of the center conductor and the antenna through a matching circuit.
[0036]
A transmission device according to a twelfth aspect of the present invention is the transmission device according to the eleventh aspect, wherein a radio wave signal from the first wireless device is received at one end and output as a reception signal, and the transmission line is a reception signal. Is transmitted from one end to the other end, and the second antenna transmits the received signal at the other end as a radio signal to the second radio apparatus.
[0037]
With this configuration, for example, a radio signal from a radio device arranged in one room is received by the first antenna, and the received signal output from the first antenna is transmitted through a transmission line with a small transmission loss. The received signal at the other end can be transmitted as a radio signal by the second antenna to the wireless device disposed in the other room.
[0038]
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0039]
(Embodiment 1)
FIG. 1 is a configuration diagram showing a transmission apparatus using a transmission line according to Embodiment 1 of the present invention.
[0040]
In FIG. 1, the building 100, the rooms 101 and 102, the wireless device 103, the antenna 104, the wireless LAN-equipped personal computer (hereinafter, personal computer) 105, the partition wall 106, and the network N are the same as those in FIG. Description is omitted. 1 is a transmission device using a transmission line 3 (described later) arranged from one room 101 to the other room 102, 2 is a first antenna arranged at one end of the transmission line 3, and 3 is one end A transmission line 4 for transmitting a signal from one part to the other end part is a second antenna disposed at the other end part of the transmission line 3.
[0041]
The operation of the transmission line configured as described above will be described.
[0042]
The radio signal transmitted from the wireless device 103 disposed in the room 101 via the antenna 104 passes through the space of the room 101, the partition wall 106, and the space of the room 102, and also the space of the room 101, the transmission device 1, and the room 102. Is received by the personal computer 105 through the space. That is, the transmission system in FIG. 1 includes a first transmission system composed of the space of the room 101, the partition wall 106 and the space of the room 102, and a second transmission composed of the space of the room 101, the space of the transmission device 1 and the room 102. The system is arranged in parallel. Here, since the first transmission system passes through the partition wall 106, the transmission loss is large, and most of the signals reaching the personal computer 105 are signals transmitted through the second transmission system including the transmission device 1. That is, the radio signal having the electric field strength E2 reaches the personal computer 105 via the first antenna 2, the transmission line 3, and the second antenna 4 as a radio signal having the electric field strength E3. Here, if the transmission loss in the transmission device 1 is 15 dB, the spatial loss in the room 101 is 20 dB, the spatial loss in the room 102 is 20 dB, and the transmission level of the wireless device 103 is −10 dBm, the personal computer 105 as a wireless signal receiving device. The communication level is −65 dBm, and the communication sensitivity of the personal computer 105 may be −65 dBm or more.
[0043]
2 is a schematic diagram schematically showing the transmission apparatus 1 of FIG. 1, and FIG. 3A is a cross-sectional view (transverse cross-sectional view) of the transmission line 3 of FIG. ) Is a cross-sectional view showing a modification of the transmission line in FIG.
[0044]
2 and 3, 1 is a transmission apparatus similar to that in FIG. 1, 2 is a first antenna similar to FIG. 1, 3 is a transmission line similar to FIG. 1, and 4 is a second antenna similar to FIG. Reference numerals 5 and 6 denote matching units for matching with the characteristic impedance (for example, 50Ω) of the transmission line 3, and reference numeral 7 denotes a central conductor disposed in the central portion of the cross section of the transmission line 3 which is a tape body having a rectangular cross section. Width W, thickness t), 8 is a first dielectric having a rectangular cross section surrounding the central conductor 5, 9, 10 are external conductors formed on both long sides of the first dielectric 8, and 11 is an external A second dielectric (outer peripheral dielectric) having a rectangular cross section surrounding the conductors 9 and 10 and through-holes 12 and 13 to be described later is provided as an outer conductor for electrically connecting the outer conductors 9 and 10. Through hole (height b, outer dimension Wd), 14 is a second rectangular cross section An adhesive tape 15 is attached to one long side of the electric body 11 (lower long side in FIG. 3A), and 15 is one long side of the second dielectric 11 (in FIG. 3B). It is an electrical shield attached between the lower long side) and the adhesive tape 14.
[0045]
The material, characteristics, etc. of the transmission line 3 configured as described above will be described.
[0046]
The central conductor 7 is made of, for example, copper, the outer conductors 9, 10, 12, and 13 are, for example, copper foil, the first and second dielectrics are, for example, polyimide, and the electrical shield 15 is the walls of the rooms 101, 102, etc. It is a ferrite layer or a conductor layer containing a ferrite material that can effectively remove the influence from the mounting portion. For example, the ferrite is powdered and included in another material such as a resin so that the electrical breaker can be formed into a tape shape. As shown in FIG. 3A, the width of the transmission line 3 is Wd1 and the height is d, and these dimensions are, for example, Wd1 = 20 mm and d = 2 mm. As a result, a flexible transmission line with a small transmission loss is obtained, and the transmission line 3 with a small transmission loss has a flat plate shape as a whole as shown in FIG. 3 (by Wd1 = 20 mm and d = 2 mm). Therefore, the transmission line 3 can be passed through a narrow space such as a wall, door, or window gap. Also, as shown in FIG. 3, the thickness of one long side (here, the lower long side) of the second dielectric 11 is made larger than the thickness of the other long side (here, the upper long side). Can also reduce the influence from the mounting parts such as the walls of the rooms 101 and 102 and stabilize the characteristic impedance of the transmission line 3. it can. Further, by arranging a tape-shaped electrical shield 15 on one long side of the second dielectric 11 having a rectangular cross section, and attaching an adhesive tape to the electrical shield 15, the rooms 101, 102 are provided. It is possible to further reduce the influence from the mounting portion such as the wall. The surface of the adhesive tape mounting surface (back surface 3b) and the opposite surface (surface 3a) are often different from the wall and ceiling designs. The paper is attached to the surface 3a so that it is easy to stretch the surface, and the surface 3a is made “paper finish” in the same manner as the gypsum board (plaster board). Thereby, it becomes easy to paste wallpaper on the surface 3a, and it is possible to avoid deteriorating the beauty. Also, because it is paper, the design can be written with paint or colored pencils.
[0047]
Next, a specific transmission loss in the transmission line 3 will be described.
[0048]
When each dimension of the transmission line 3 is t = 25 μm, W = 1.56 mm, b = 1.5 mm, and Wd = 25.65 mm, the cross-sectional area Sd = 38.48 mm 2 (mm 2 represents square millimeters) ), The central conductor structure coefficient K1 = 1.1, and the upper and lower conductor structure coefficients K2 = 1.2. When the dielectrics 8 and 11 are made of foamed polyethylene, the effective dielectric constant εr = 1.5 and the effective dielectric power factor tan δ = 0.00015. Further, it is assumed that the characteristic impedance Z of the transmission line 3 is 50Ω and the use frequency f is 2400 MHz (however, it is possible not only to 2400 MHz but also to transmit communications at other frequencies including the 5 GHz band). From these numerical values, the resistance attenuation amount αr = 0.2552, the leakage attenuation amount αg = 0.0401, the attenuation amount α = 0.29553 dB / m, and the 10 m attenuation amount α10 = 2.953 dB. That is, the 10 m attenuation α10 is about 3 dB. Therefore, if the space loss of the rooms 101 and 102 is 20 dB, the loss of the antennas 2 and 4 is 6 dB, and the length of the transmission line 3 is 10 m, the power loss from the wireless device 103 to the personal computer 105 is 20 dB × 2 + 6 dB × 2 + 3 dB = 55 dB. In this case, if the transmission level of the wireless device 103 is −10 dBm, the communication level of the personal computer 105 as the wireless signal receiving device is −65 dBm, and the communication sensitivity of the personal computer 105 may be −65 dBm or more. Here, if the wall loss of the partition wall 106 is 30 dB and the space loss from the wireless device 103 and the personal computer 105 to the wall 106 is 30 dB, the communication level of the personal computer 105 as the wireless signal receiving device is −100 dBm. It is necessary that the communication sensitivity is -100 dBm or more. Since the distance loss of the transmission line 3 is α = 0.2953 dB / m, even if the distance is 100 m, the loss is about 30 dB. In this case, the communication level of the personal computer 105 as the wireless signal receiving device is − Communication is possible if the communication sensitivity of the personal computer 105 is -82 dBm or higher.
[0049]
In this embodiment, communication between the rooms 101 and 102 is targeted. However, the present invention is not limited to this, and can be applied to communication between train vehicles, for example. In addition, although the rooms 101 and 102 are shown as adjacent rooms, it is clear from the above-described numerical examination that the same effect can be obtained even if antennas of two rooms far apart are connected via the transmission line 3. is there.
[0050]
As described above, according to the present embodiment, two transmission lines 3 are arranged in parallel with a predetermined distance b from both sides of the central conductor 7 formed in a flat plate shape and the flat conductor. The provided outer conductors 9 and 10, the outer periphery of the outer conductors 9 and 10, and / or the dielectrics 8 and 11 disposed in the gap between the outer conductors 9 and 10 and the center conductor 7, and the outer conductors 9 and 10 By having the through holes 12 and 13 that electrically connect each other, the transmission line 3 with little transmission loss can be formed in a flat plate shape as a whole. Can be passed through a narrow space. In addition, if the through holes 12 and 13 are arranged at intervals of less than a quarter wavelength of the minimum wavelength of the electric signal to be transmitted, leakage of magnetic flux can be efficiently suppressed and the shielding effect can be enhanced. Therefore, the number of through holes can be made appropriate by considering the minimum wavelength of the transmitted electrical signal. For example, if the maximum electrical signal to be transmitted is 2.4 GHz, the interval is 300/2400/4 = 31 mm, and if the maximum electrical signal to be transmitted is 5.6 GHz, 300/5600/4 = 13 mm. By providing through-holes at intervals, magnetic flux leakage can be efficiently suppressed.
[0051]
Further, by attaching the adhesive tape 14 to one long side of the outer peripheral dielectric 11 that is a dielectric disposed around the outer periphery of the outer conductors 9 and 10, the transmission line 3 is connected via the adhesive tape 14. It can be easily fixed to a mounting portion such as a wall.
[0052]
Further, the central conductor 7 is arranged at a position far from the mounting portion such as a wall by making the thickness of one long side of the outer peripheral dielectric 11 thicker than the thickness of the other long side of the outer peripheral dielectric 11. Therefore, the electrical influence from the mounting portion can be reduced, and the characteristic impedance of the transmission line 3 can be stabilized.
[0053]
Further, a tape-shaped electrical shield 15 is disposed on one long side of the dielectric 11 disposed on the outer periphery of the outer conductors 9 and 10, and the adhesive tape 14 is attached to the electrical shield 15. As a result, the mounting portion such as a wall can be electrically shielded, so that the electrical influence from the mounting portion can be reduced and the characteristic impedance of the transmission line 3 can be stabilized.
[0054]
Furthermore, since the electrical shield 15 is made of ferrite, the mounting portion such as the wall can be shielded electrically and magnetically, so that the electrical influence from the mounting portion can be further reduced and the transmission line can be reduced. 3 characteristic impedance can be further stabilized.
[0055]
Furthermore, by including the transmission line 3, the first antenna 2 disposed at one end of the transmission line 3, and the second antenna 4 disposed at the other end of the transmission line 3, A radio signal from the wireless device 103 arranged in the room can be transmitted through the transmission line 3 with little transmission loss, and the reception level in the personal computer 105 arranged in the other room 102 can be increased.
[0056]
Further, the first antenna 2 receives a radio signal from the wireless device 103 arranged in one room 101 at one end and outputs it as a received signal, and the transmission line 3 transmits the received signal from one end to the other end. The second antenna 4 transmits the received signal at the other end as a radio wave signal to the personal computer 105 disposed in the other room 102, thereby transmitting from the wireless device 103 disposed in the one room 101. The radio signal is received by the first antenna 2, the reception signal output from the first antenna 2 is transmitted by the transmission line 3 with a small transmission loss, and the received reception signal at the other end is transmitted to the second antenna 4. Can be transmitted as a radio wave signal to the personal computer 105 arranged in the other room 102.
[0057]
Further, since the wireless device 103 is a wireless router and the personal computer 105 is a personal computer with a wireless LAN, a signal from the wireless router connected to the network can be received by a personal computer having a wireless signal communication function.
[0058]
【The invention's effect】
As described above, according to the transmission line according to claim 1 of the present invention, the transmission line transmits an electric signal, and the transmission line is formed in a flat conductor with a central conductor formed in a flat plate shape. A transmission line having a small transmission loss by having two outer conductors arranged in parallel at a predetermined distance from both surfaces of the center conductor and a dielectric disposed in a gap between the outer conductor and the center conductor Can be formed in a flat plate shape as a whole, so that an advantageous effect can be obtained in that it is excellent in flexibility and the transmission line can be passed through a narrow space such as a gap between a wall, a door, or a window.
[Brief description of the drawings]
1 is a configuration diagram illustrating a transmission device using a transmission line according to Embodiment 1 of the present invention; FIG. 2 is a schematic diagram schematically illustrating the transmission device of FIG. 1; Cross-sectional view taken along line AA of the line (b) Cross-sectional view showing a modification of the transmission line in (a) [FIG. 4] Configuration diagram showing an example of a conventional transmission system [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission apparatus 2 1st antenna 3 Transmission line 3a, 3b Adhesive tape attachment surface 4 2nd antenna 5, 6 Matching device 7 Center conductor 8 1st dielectric material 9, 10 Outer conductor 11 2nd dielectric material (outside Ambient dielectric)
12, 13 Through hole (external conductor)
14 adhesive tape 15 electrical shield 100 building 101, 102 room 103 wireless device 104 antenna 105 wireless LAN personal computer 106 partition wall N network

Claims (12)

A transmission line for transmitting electrical signals,
The transmission line includes a central conductor formed in a flat plate shape, an outer conductor formed in a flat plate shape with a predetermined distance from both surfaces of the central conductor, and the outer conductor and the center. A transmission line comprising a dielectric disposed in a gap with a conductor. The transmission line according to claim 1, further comprising a connection portion that electrically connects the outer conductors. The transmission line according to claim 2, wherein the connection portions are arranged at intervals of less than a quarter wavelength of a maximum wavelength of an electric signal to be transmitted. The transmission line according to claim 2, wherein the connection portion is configured by a through hole. The transmission line according to any one of claims 1 to 4, further comprising an outer peripheral portion in which a dielectric is disposed around the outer periphery of the outer conductor. The transmission line according to claim 5, wherein an adhesive tape is attached to one of the long sides of the outer peripheral portion. The transmission line according to claim 5 or 6, wherein a thickness on one long side of the outer peripheral portion is made thicker than a thickness on the other long side of the outer peripheral portion. The transmission line according to claim 1, wherein a tape-shaped electrical shield is disposed on one long side of the outer peripheral portion, and an adhesive tape is attached to the electrical shield. The transmission line according to claim 8, wherein the electrical shield is made of a material containing ferrite. The transmission line according to claim 8 or 9, wherein paper is disposed on the long side opposite to the long side to which the adhesive tape is attached. The transmission line according to any one of claims 1 to 10, a first antenna disposed at one end of the center conductor, and a second antenna disposed at the other end of the center conductor. A transmission apparatus comprising: The radio signal from the first radio apparatus is received at the one end and output as a received signal, the transmission line transmits the received signal from the one end to the other end, and the second antenna transmits The transmission device according to claim 11, wherein the received signal at the other end is transmitted as a radio signal to the second wireless device.

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