JP2003169003A - Radio communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication device which can actualize stable information transmission using power-line carrier and excellent radio data communication in combination by effectively eliminating noise disturbance that the power-line carrier has. <P>SOLUTION: A blocking filter which exhibits high impedance on a power- source output-line side of a premise internal side to a signal above a desired frequency is inserted and connected to the power-source output line in the premise internal side which is led out of a power-line terminal and a radio transmitter receiver is connected to the power output of the block filter to the premise internal side. The radio wave transmitter receiver transmits a low-frequency-side signal of a power-line modem which has signals of a power-source output of the blocking filter to the premise internal side as the input and output of a high-frequency side at a radio frequency and supplies a low-frequency-side signal obtained by receiving an arrival radio frequency as the low-frequency-side signal of the power-line model to generate and supply a high-frequency-side output to the power-source output to the premise internal side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for transmitting information from an AC power source driven electric device surrounded by a radio wave shield such as a metal case.

[0002]

2. Description of the Related Art In recent years, timber has been used as little as possible in consideration of global environmental problems. Electric appliances are no exception, and metal is often used for housings. In addition, electromagnetic waves are inevitably generated by the switching operation of the digital circuit in the electric device. This may affect other devices. Generally, this is called electromagnetic interference noise, electromagnetic interference, Electro Magnetic I
This is called ntrerference (EMI). To prevent this, electric devices are often electromagnetically shielded with metal.

FIG. 12 shows a conventional example in which signals of an electric device are wirelessly transmitted and received. In this case, a signal line 21 for interconnecting the electric device 11 and the radio wave transmission / reception unit 12 is required, a hole for passing the signal line 21 is required in a portion A, and a high frequency signal for the antenna 13 A hole for passing the high frequency cable for transmission is also required.

FIG. 13 shows a conventional example of transmitting and receiving a signal of an electric device. This is an example in which the electric device 11 and the radio wave transmitting / receiving unit 12 are integrated. Also in this case, antenna 1 is the minimum condition.
A hole for passing the high frequency cable is required at the point B connected to 3.

Further, when it is desired to perform remote operation or data communication without modifying the structure itself of the housing of the existing electric equipment 11, a method using a power line modem (power line modem) is used. This is a technology that has recently been attracting attention in the communication industry, and is a technology for communicating using power lines wired in factories and homes.

FIG. 14 shows an example in which a power line modem is used for electric equipment. The power line 2 that is connected to the electric device 11 that operates with the AC power supplied from the power line
5 is a communication system that superimposes a signal to be transmitted on 5 and transmits data to the electric device 11. In this communication system, it is not necessary to add a new signal line. That is, it is not necessary to make a hole in the housing of an electric device or the like.

FIG. 15 is a block diagram of the power line modem 15. The signal arriving on the signal line 21 from the electric device is modulated by the modulator / demodulator 32, and the signal is isolated by the insulating transformer 3.
It is configured to be superposed on the power line 25 via 1. The power supply circuit 33 is for supplying necessary power to the electric device 11.

[0008]

Since power networks are usually designed for efficient power supply,
Originally, the combination of communication technologies is not considered. For this reason, various electric devices connected to the power line for the purpose of receiving power become a noise source, which hinders communication using the power line. Furthermore, some electric appliances connected to the power line have very low impedance to the communication frequency band. Specifically, electromagnetic induction heating (Induction
The impedance in the communication frequency band of cooking appliances and electromagnetic products using (heating) is very small. As a result, the transmission frequency signal is attenuated, reflected, etc., which hinders communication. In addition, the number of electric products connected to the power line will increase or decrease from the normal usage mode in which a large number of types of electric devices are connected to the power line as necessary, and the fluctuation of impedance in the communication frequency band becomes a big problem. ing. Further, generally, the power line is distributed by a pole transformer attached to a power pole, but when distributed to a plurality of homes, there is a problem that a signal leaks between the distributed power lines. On the contrary, when power is supplied from another pole transformer in a large-scale facility, that is, when the power transformer is present in the same facility, the signal transmission is blocked by the power transformer and even in the same facility. There is a problem that the signal cannot be communicated.

As described above, when an information transmission line is formed for an existing electric device, there are the following problems. First, when it is desired to perform wireless communication from inside a housing made of metal, there is a drawback that a hole for a high frequency cable used for mutual signal transmission with an antenna must be formed in the housing. Considering the advantage that communication can be performed without using the power line if the power line is used, a power line modem may be used as the transmission means in this case. There are drawbacks. Various electric devices become noise sources and interfere with communication. Some electric products connected to the power line have very low impedance in the communication frequency band, and attenuation, reflection, etc. occur, which hinders communication. The change in impedance in the communication frequency band due to the increase or decrease in the number of electric products connected to the power line poses a serious problem. The power line is distributed to a general household by a pole transformer attached to a utility pole, but when distributed to a plurality of households, there is a problem that a signal leaks between the distributed power lines. On the contrary, in a large-scale facility, when power is supplied from another pole transformer, that is, when the power transformer intervenes in the power line in the same facility, the signal transmission is blocked by the power transformer and the same facility is used. There is a problem that signals cannot be communicated even inside.

It is an object of the present invention to eliminate these drawbacks of the prior art, to effectively eliminate the noise interference of power line carrier and to realize stable information transmission using power line carrier and good wireless data communication together. It is to provide a wireless communication device capable of performing the above.

[0011]

In order to solve this problem, a wireless communication device according to the present invention is inserted and connected to a power supply line terminal connected to a power supply line and a power supply output line on the inside of a premises taken out from the power supply line terminal. A blocking filter exhibiting a high impedance on the power output line side of the inner side of a signal in a frequency band of a predetermined frequency or higher, and a radio wave transmitter / receiver connected to the power output to the inner side of the blocking filter, A radio communication device comprising: a power line modem, wherein the radio wave transmitter / receiver uses a signal in a frequency band equal to or higher than the predetermined frequency in a power output to the inner side of the blocking filter as a high frequency input / output, The low frequency side signal of the power line modem is transmitted to the low frequency side and the low frequency side signal obtained by receiving the incoming radio frequency is used as the low frequency side signal of the power line modem. Signal is supplied as a signal to generate a high-frequency side output to supply power to the inside of the building, and a radio frequency band antenna connected to the radio wave transmitting / receiving unit. is doing.

That is, in the device of the present invention, the power line (AC
When data is transmitted from an electric device using a line, a modulated high frequency wave obtained by modulating the signal of the electric device of the terminal by the terminal side power line modem is superimposed on the power line in the premises. The modulated high-frequency signal that goes out of the housing of the electric device through the power line in the premises is demodulated by another power line modem on the radio wave transmitter / receiver side for transmission by the radio wave transmitter / receiver. The premises power line is connected to a power line (AC line) outlet through a blocking filter, and is separated from the power line (AC line) outside the outlet in terms of high frequency. In the case of reception, the modulated wave obtained by modulating the signal received by the radio wave transceiver and demodulated by the power line modem on the radio wave transceiver side is
It is superimposed on the local power line. The terminal side power line modem connected to the electric equipment is configured to demodulate the modulated high frequency signal superimposed on the local power supply line and send the demodulated output signal to the electric equipment.

The blocking filter and the radio wave transmitter / receiver are housed in a single housing, the antenna of the radio wave transmitter / receiver is attached to the housing, and a power plug is attached to the outer wall of the housing. Once attached, the contact terminals of the power plug can be integrally configured so as to project outward from the housing and be pushed into and contact a power line outlet such as a wall outlet.

A flat antenna may be used as the antenna, the housing may be made of a synthetic resin material, and the flat antenna may be housed in the housing.

[0015] The casing may be provided with an outlet that is connected to a power plug of another electric device.

An outlet may be connected to the premises power line led out from the housing, and the outlet may be housed and arranged in an outlet housing.

The power output line inside the premises may be connected to an electric device having a power line modem connected to the power output line and having a transmission / reception function.

An electric device having a transmission / reception function may be further connected to the low frequency signal side of the power line modem in the radio wave transmitter / receiver.

The radio wave transmitter / receiver of the radio wave transmitter / receiver may be configured to be connected to a power line modem of the electric device.

[0020]

With the above configuration, in an electric device using a power line (AC line), a line dedicated to data transmission is not used from a casing that is electromagnetically shielded, and the noise interference of the power line carrier is effectively prevented. Excluded good wireless data communication can be performed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an embodiment of the present invention.
1 is a terminal device, 2 is a radio wave transmitter / receiver, 3 is a blocking filter (impedance upper), 11 is an electric device such as an electric appliance, 12 is a radio wave transmission / reception unit (radio unit), 13 is an antenna, 14 is a power line plug, 15 And 16 are power line modems. 21 and 23 are signal lines for transmitting data,
Reference numeral 24 is a power supply line for supplying power to the electric device 11, and 25 is a local power supply line. The terminal device 1 includes an electric device 11 and a power line modem 15. The radio wave transmitter / receiver 2 includes a radio wave transmitter / receiver unit (radio unit) 12 and a power line modem 16. When transmitting a signal from the electric device 11, first, the signal transmitted from the electric device 11 is transmitted to the power line modem 15 via the signal line 21 for transmitting the signal. The power line modem 15 superimposes a modulated wave obtained by modulating a carrier of a higher frequency with this signal on the local power line 25.
The power line modem 15 is illustrated so as to also supply power necessary for the electric device 11 through the power line 22.
The power line 22 may be directly connected to the local power line 25.

When a transmission signal from the electric device 11 is transmitted, the modulated wave signal created as an output obtained by modulating the transmission signal by the power line modem (A) 15 and superimposed on the local power line 25 is a radio wave transceiver. Power line modem (B) 1 in 2
6 and demodulated. The demodulated low frequency signal is transmitted to the radio wave transmitting / receiving unit 12 via the signal line 23 for transmitting data and converted into a modulated high frequency. The modulated high frequency wave from the radio wave transmitting / receiving unit 12 is emitted as a radio wave via the antenna 13. The radio wave transmitting / receiving unit 12 may be an optical communication device.
The modulated wave signal superimposed on the local power line 25 is insulated from the power line plug 14 side in a high frequency manner by the blocking filter 3. Therefore, even if the condition of the power line (AC line) changes, the carrier wave transmission system inside the premises stably operates as a transmission system of the modulated wave signal. The blocking filter 3 plays a role of increasing the impedance in the communication frequency band and is also called an impedance upper.

A case where the electric device 11 receives a modulated high frequency signal (carrier signal) will be described. At this time,
The incoming radio wave is first received by the radio wave transmitter / receiver 12 in the radio wave transmitter / receiver 2 via the antenna 13 and detected. The detected signal is sent to the power line modem (B) 16 through the signal line 23. The power line modem (B) 16 superimposes a modulated high frequency wave obtained by modulating a carrier wave with this signal on the local power supply line 25. The modulated high-frequency signal superimposed on the local power line 25 is the power line modem (A) in the terminal device 1.
It is sent to 15 and demodulated. The demodulated low frequency signal is
The data is transmitted to the electric device 11 via the signal line 21 for transmitting data, and the electric device 11 can receive the low frequency signal. The modulated high frequency signal superimposed on the local power supply line 25 is insulated from the power line (AC line) outside the power supply line plug 14 at high frequency by the blocking filter 3 as in the case of transmission. Therefore, even if the condition of the power line on the AC line side changes, the signal transmission system inside from the power plug 14 operates stably as a transmission system of the modulated high frequency.

FIG. 2 shows an embodiment of the device of the present invention. A radio wave transmitter / receiver 4 with a power plug is a radio wave transmitter / receiver 12, a power line modem 16, a blocking filter 3 and a power plug 14 described with reference to FIG. And are accommodated in the housing 5,
A power plug 14 is attached to the outer wall of the housing 5,
The contact terminals are integrally formed so as to project outward from the housing 5 and can be pressed into contact with the wall outlet 17 or the like. FIG. 2 shows a state in which the power plug 14 of the radio wave transmitter / receiver 4 with a power plug is connected to the wall outlet 17.

FIG. 3 shows another embodiment of the device of the present invention.
The radio wave transmitter / receiver 4 with a power plug is integrally configured with a radio wave transmitter / receiver 12, a power line modem 16, a blocking filter 3, a power plug 14, and an outlet 18 for connecting a power plug 19 of an electric device. FIG. 3 shows a state in which the outlet 18 for connecting the radio wave transmitter / receiver 4 and the power source plug 19 of the electric device 1 and the radio wave transmitter / receiver 4 with the power source plug 14 are coupled to the wall outlet 17.

In FIG. 4, a plane antenna (not shown) is further used as an antenna of the radio wave transmitter / receiver 4, and the plane antenna is made of a synthetic resin material having a characteristic of being transparent to radio waves. The example accommodated inside is shown. In this case, the housing 5 has a space 5-1 for accommodating the blocking filter 3 and a space 5 for accommodating the planar antenna 13a, as indicated by a dotted line, for example.
-2, a space 5-3 for accommodating the radio wave transmitting / receiving unit 12 and a space 5-4 for accommodating the power line modem 16 are provided, and these spaces 5-1, 5-2, 5-3, 5-4 are respectively provided. , The corresponding blocking filter 3, the planar antenna 13a, the radio wave transmitting / receiving unit 12, and the power line modem 16 can be accommodated to form an extremely compact device. As a specific example of the planar antenna, Japanese Patent Laid-Open No. 2001-1
No. 68629 “F-shaped antenna” can be used. By using a plurality of such plane antennas and making the radio wave transmission / reception unit 12 a diversity transceiver, it becomes possible to secure a more stable wireless line transmission path.

FIG. 5 shows a configuration in which a plurality of terminal devices 1 are connected and a radio wave transmitter / receiver 2 transmits / receives data. Each of the plugs 19 of the plurality of terminal devices 1 is connected to the outlet 25a, and the electric wave transmitter / receiver 4 including the electric wave transmitter / receiver 2 and the blocking filter 3 is connected between the electric outlet 25a and the wall outlet 17. Here is an example.

FIG. 6 shows a state in which a plurality of terminal devices 1 are connected and the radio wave transmitter / receiver 2 transmits / receives data. Each power plug 19 of the plurality of terminal devices 1 is connected to the outlet 25a, and the blocking filter 3 is connected between the outlet 25a and the wall outlet 17. The radio wave transmitter / receiver 2 is connected to the outlet 25a by the power plug 20 of the radio wave transmitter / receiver 2, and all the electric devices 1 connected to the outlet 25a and the electric device 1 as described above.
Communication is possible via the power line modems (A) and (B) provided inside and inside the radio wave transmitter / receiver 2, respectively.

FIG. 7 shows a state in which a plurality of terminal devices 1 are connected and the radio wave transmitter / receiver 2 transmits / receives data. The radio wave transmitter / receiver 2 can communicate with any position of the outlet 25a.

FIG. 8 shows an embodiment in which a plurality of terminal devices 1 and a plurality of radio wave transmitters / receivers 2 are connected to an outlet 25a for communication. Depending on the radio wave environment, a plurality of radio wave transmitters / receivers 2 having different radio frequencies may be required. Further, in the case where confidentiality is important or in the case of infrared communication, there may be a case where a plurality of radio wave transmitters / receivers 2 individually assigned for each application are required.

FIG. 9 shows an embodiment in which a plurality of sets of terminal devices 1 are connected to one network via a plurality of radio wave transmitters / receivers 2. Floor A 101, Floor B 102 and C
It is assumed that the floors 103 are distant from each other and cannot form a wireless transmission path for wirelessly interconnecting all the terminals 1 and one central device without relaying. The data of the terminal device 1 on the A floor 101 is
It is collected in the relay radio station 26a. Similarly, the data of the terminal device 1 on the B floor 102 is collected in the relay wireless station 26b. Similarly, the data of the terminal device 1 on the C floor 103 is collected in the relay wireless station 26c. Each relay radio station 26
The data collected in a, 26b, and 26c are transmitted to the wireless center 27. When collecting data of the terminal device 1 on each floor at each relay wireless station 26a, 26b, 26c,
By suppressing the transmission power of each radio wave transmitter / receiver 2, the risk of leakage to another floor (other place), which is a drawback of the system using only the power line modem, can be greatly improved.

FIG. 10 shows a radio wave transmitter / receiver 12 of a radio wave transmitter / receiver 2 in which the terminal device 1 and the radio wave transmitter / receiver 2 are integrally formed.
And a state in which data is transmitted and received between the terminal device 1 and a plurality of connected terminal devices 1. The antenna 13 is mounted on the housing of the electric device 1.
This is an example in the case where it is allowed to pass through a signal line for attaching. The electric device 1 integrated with the radio wave transmitting / receiving unit 12 can directly communicate with the radio wave transmitting / receiving unit 12 without the power line modem 15.

FIG. 11 shows a state in which data is transmitted and received between the radio wave transmitter / receiver 12 of the radio wave transmitter / receiver 2 in which the terminal equipment 1 and the radio wave transmitter / receiver 2 are integrally formed and a plurality of terminal equipments 1 connected. Is another example showing. Also in this case, the electric device 1
This is an example of the case where the signal line for attaching the antenna 13 is allowed to pass through the housing of FIG. However, in this case, the power line modem (A) 15 of the electric device 1a integrated with the radio wave transmitter processes each signal superimposed on the power supply line of the plurality of other electric devices 1 and processes the processed signal. Data and electrical equipment 1
By supplying the antenna 13 with a radio frequency obtained by transmitting to the radio wave transmitting / receiving unit 12 integrated with a, the radio wave transceiver 2 integrated with the electric device 1a
Need not be provided with the power line modem (B) 16.

(Other Embodiments) A game machine used in a game center is called an arcade game in order to distinguish it from a game used at home. As a method to meet the requirement of managing the billing information and defect information of this arcade game at a centralized management center, etc., a wireless LAN (2.4
GHz) and wireless systems such as Bluetooth are possible. However, in recent years, in consideration of global environmental problems, lumber has not been used as much as possible in the housing of arcade game machines. The arcade game machine is used by an unspecified number of users and requires a structure having a considerable strength. Therefore, the casing is made of metal instead of resin. Further, in the digital circuit of the game machine, electromagnetic waves are inevitably generated due to the switching operation. This EMI (Elctro Magnetic In
In many cases, metal is used for the housing as a countermeasure. Therefore, when constructing a wireless system, an antenna must be provided outside in order to emit radio waves from the arcade game machine. It was necessary to make a hole for the signal line for data communication in the housing and connect it to the antenna.

Here, the signal is taken out of the arcade game machine by superimposing the charging information and the trouble information on the power line by the power line modem. However, if an attempt is made to communicate with the power line as it is, various electric devices connected to the power line in the game center will become a noise source and hinder communication. The change in impedance in the communication frequency band due to the increase or decrease in the number of electric products connected to the power line is also a big problem. Power lines are distributed by transformers attached to utility poles. Therefore, in the case of a collective building, there is a problem that a signal leaks to the outside when distributed to the other floors or other floors by the same transformer. In addition, large facilities may be powered by another transformer. That is, when the power transformer is provided in the same facility, there is a problem that signals cannot be communicated even in the same facility.

Here, in order to communicate without making a hole in the housing, a signal is taken out by the power line modem. For example, the carrier frequency of the power line modem is 10 kHz to 450 kHz. In this carrier frequency band, the wall line side power line and the arcade game machine are separated by a blocking filter. The blocking filter is the carrier frequency (10KHz
It shows a high impedance at ˜450 KHz) and a low impedance at a commercial power frequency (50 or 60 Hz). Originally, a blocking filter was developed to separate a power line from a device having a low impedance in this frequency band, for example, a heating cooking appliance or an electric heating product using electromagnetic induction heating (Induction Heating).

Since the power line on the wall outlet side and the arcade game machine are separated by the blocking filter, the arcade game machine is stable regardless of the conditions of the power line. The signal that came out of the housing of the arcade game machine,
The signal is demodulated by a power line modem in front of the wall outlet and the signal is transmitted as a 2.4 GHz carrier wave. The effect is the same for Bluetooth and infrared communication. Therefore, it is possible to stably transmit and receive data wirelessly without opening a communication line other than the power line in the case in the arcade game and compensating for the drawbacks of the power line modem.

[0038]

As described in detail above, according to the present invention, in order to superimpose the required signal in the electric device on the power line modem and the data on the power line, a new processing for the signal line is performed. There is an advantage that it need not be applied to Furthermore,
Since the power line is insulated from the power line on the plug side, the power line modem has an advantage of operating stably regardless of the conditions of the power line. Furthermore, an information transmission system using this wireless communication device obtains a signal of an electric device surrounded by a metal by a power line and wirelessly transmits / receives the signal. In other words, a signal line for a new signal line is used. Since communication is performed without performing processing on the housing, there is an advantage that an electric device surrounded by metal has an excellent function capable of countering noise interference equivalent to that when directly transmitting by radio.

[Brief description of drawings]

FIG. 1 is a connection configuration diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a power plug of a radio wave transmitter / receiver with a power plug according to an embodiment of the present invention is connected to a wall outlet.

FIG. 3 is a perspective view showing a state in which a power plug of a radio wave transmitter / receiver with a power plug according to an embodiment of the present invention is connected to a wall outlet.

FIG. 4 is a perspective view showing a configuration of a radio wave transmitter / receiver with a power plug which is another embodiment of the present invention.

FIG. 5 is a block diagram showing an embodiment of the device of the present invention when targeting a plurality of terminal devices.

FIG. 6 is a block diagram showing another embodiment of the device of the present invention for a plurality of terminal devices.

FIG. 7 is a block diagram showing another embodiment of the device of the present invention when targeting a plurality of terminal devices.

FIG. 8 is a block diagram showing another embodiment of the device of the present invention when targeting a plurality of terminal devices.

FIG. 9 is a block diagram showing an embodiment of the device of the present invention when targeting a plurality of terminal devices arranged on a plurality of floors.

FIG. 10 is a block diagram showing another embodiment of the device of the present invention in the case of targeting a plurality of terminal devices.

FIG. 11 is a block diagram showing another embodiment of the device of the present invention when targeting a plurality of terminal devices.

FIG. 12 is a connection configuration diagram showing a configuration of a conventional example in which signals of an electric device are wirelessly transmitted and received.

FIG. 13 is a connection configuration diagram showing a configuration of another conventional example for transmitting / receiving a signal of a wireless electric device.

FIG. 14 is a connection configuration diagram showing a conventional example in which a power line modem is used for an electric device.

15 is a block diagram of a power line modem used in the conventional example of FIG.

[Explanation of symbols]

1,1a Terminal equipment 2 Radio wave transceiver 3 Blocking filter Radio transceiver with 4 power plugs 5 housing 11 electrical equipment 12 Radio wave transceiver (radio section) 13 antennas 14 Power plug 15,16 Power line modem 17 wall outlet 18 outlets 19,20 Power plug 21,23 signal line 22, 24 Power line 25 premises power line 25a outlet 26a, 26b, 26c Relay radio station 27 wireless center 101 A floor 102 B floor 103 C floor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masanobu Ozaki             1-74-1 Kugayama, Suginami-ku, Tokyo Iwadori             Inside AIESEC Co., Ltd. F term (reference) 5K046 AA09 BB05 CC05 CC09 CC17                       PS21 PS24 PS33 YY01

Claims (8)

[Claims] 1. A power supply line terminal connected to a power supply line and a power supply output line on the inside of a premises taken out from the power supply line terminal, which is inserted and connected to the inside of the premises for signals in a frequency band of a predetermined frequency or higher. A radio communication device comprising: a blocking filter exhibiting high impedance on a power output line side; and a radio wave transmitter / receiver connected to a power supply output to the inside of the premises of the blocking filter, wherein the radio wave transceiver is the blocking device. A power line modem that uses a signal in a frequency band equal to or higher than the predetermined frequency in the power output to the inside of the filter as an input / output on the high frequency side;
The low frequency side signal of the power line modem is transmitted at a radio frequency, and the low frequency side signal obtained by receiving the incoming radio frequency is supplied as the low frequency side signal of the power line modem to create a high frequency side output, A radio communication device comprising: a radio wave transmission / reception unit for outputting power to the inside of a building; and an antenna for the radio frequency band connected to the radio wave transmission / reception unit. 2. The blocking filter and the radio wave transmitter / receiver are housed in a single housing, the antenna of the radio wave transmitter / receiver is attached to the housing, and a power supply is provided on an outer wall of the housing. The plug is attached, and the contact terminal of the power plug is integrally configured so as to project outward from the housing and be pushed into a power line outlet such as a wall outlet so as to be contactable. The wireless communication device described. 3. The wireless communication according to claim 2, wherein a flat antenna is used as the antenna, the housing is made of a synthetic resin material, and the flat antenna is housed in the housing. apparatus. 4. The wireless communication device according to claim 2, wherein the housing is provided with an outlet that is connected to a power plug of another electric device. 5. The wireless communication device according to claim 4, wherein an outlet is connected to the indoor power supply line led out from the housing, and the outlet is housed and arranged in an outlet housing. 6. The power output line inside the premises is connected to an electric device having a power transmission / reception function having a power line modem connected to the power output line. 5. The wireless communication device according to any one of 5. 7. The radio according to claim 1, further comprising an electric device having a transmission / reception function connected to a low frequency signal side of a power line modem in the radio wave transmitter / receiver. Communication device. 8. The radio communication device according to claim 6, wherein the radio wave transmission / reception unit of the radio wave transceiver is connected to a power line modem of the electric device.