JP5492019B2 - Wireless communication apparatus, sensor module, and reflected wave processing method - Google Patents

Description

  Embodiments described herein relate generally to a wireless communication apparatus that performs data transmission using radio waves.

  In recent years, in facilities that require advanced monitoring functions such as nuclear power plants, application of sensor networks composed of a large number of sensor modules has attracted attention. Each of the sensor modules is a small device that incorporates a sensor that performs, for example, earthquake vibration measurement.

  The sensor module transmits measurement data obtained by the sensor to a management system connected to the sensor network. A sensor module generally includes a wireless communication device for transmitting measurement data. As a result, in constructing the sensor network, it is possible to realize dataless cable communication and to maintain and manage the network equipment more efficiently.

JP 2008-292319 A JP 2004-226157 A

  Since the sensor module is a small device, a relatively small capacity battery or the like is used as a built-in power source. For this reason, in order to improve the efficiency of work such as battery replacement, measures for suppressing power consumption of the battery are important.

  Known technologies that eliminate the need for battery replacement include energy harvesting technology obtained from natural energy such as vibration, heat, and light, and power source technology using radio waves as an energy source. However, it is not easy to reduce the size of the energy harvesting technology. In addition, the power supply technology that uses radio waves needs to receive radio waves with high radio field intensity from the outside, which may affect the peripheral devices of the sensor module, causing malfunction of the equipment. .

  Therefore, it is required that the power consumption of the power source can be efficiently suppressed without depending on the surrounding environment.

According to this embodiment, the wireless communication apparatus includes a radio wave transmission unit, a reflected wave collection unit, a conversion unit, a radio wave reception unit, and a switching unit . The radio wave transmission means transmits a transmission radio wave to the antenna. The reflected wave collection means collects a reflected wave from the antenna. The converting means converts the reflected wave collected by the reflected wave collecting means into electric power. The radio wave receiving means inputs a received radio wave received by the antenna. The switching means is a means for switching a path with the reflected wave collection means, and at the time of reception operation, the received radio wave received by the antenna is transferred to the radio wave reception means via the reflected wave collection means, and the reception During a transmission operation or a standby state other than the operation time, the reflected wave or electromagnetic wave from the antenna is transferred to the conversion unit via the reflected wave collection unit .

The block diagram for demonstrating the structure of the sensor module regarding 1st Embodiment. The flowchart for demonstrating operation | movement of the sensor module regarding 1st Embodiment. The timing chart for demonstrating operation | movement of the sensor module regarding 2nd Embodiment. The block diagram for demonstrating the structure of the power supply unit regarding 2nd Embodiment. The block diagram for demonstrating the structure of the sensor module regarding 3rd Embodiment. The figure for demonstrating the relationship between the communication distance and radio wave intensity regarding 3rd Embodiment. The figure which shows an example of the table information which shows the relationship between the electromagnetic wave intensity regarding 3rd Embodiment, and a transmission electromagnetic wave output. The figure for demonstrating the abnormality detection regarding 3rd Embodiment. The figure for demonstrating the sensor network regarding each embodiment. The figure for demonstrating an example of the management table regarding 3rd Embodiment.

  Embodiments will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram for explaining a configuration of a sensor module 10 according to the first embodiment.

  The sensor module 10 includes a controller 11, a sensor 12, a memory 13, and a wireless circuit 14 as a module body. Further, the sensor module 10 is a small device with a low power specification including a power supply unit 15 and an antenna unit 21.

  The controller 11 includes a microprocessor (CPU) and controls the sensor 12 and the radio circuit 14. The sensor 12 is, for example, a seismic vibration measurement sensor installed in the plant, and outputs measurement data to the controller 11. The sensor 12 can be replaced with various measurement sensors other than the seismic vibration measurement sensor. The memory 13 is used as a storage area for temporarily storing measurement data output from the sensor 12, a storage area for a program executed by the CPU of the controller 11, and a work storage area necessary for processing of the controller 11. .

  The wireless circuit 14 is a wireless communication module that transmits and receives data by wireless communication, and is configured with a specification of, for example, a specific low power wireless station (aerial power is 10 mW or less). The radio circuit 14 is connected to the antenna unit 21 and transmits transmission radio waves to the antenna unit 21. Further, the radio circuit 14 receives a received radio wave transferred from the antenna unit 21.

  The antenna unit 21 includes an antenna 22, a reflected wave recovery circuit 23, a first switch circuit 24, and a second switch circuit 25. The reflected wave recovery circuit 23 is composed of, for example, a circulator, and is disposed between the radio circuit 14 and the antenna 21.

  The reflected wave recovery circuit 23 is connected to the radio circuit 14 via the first switch circuit 24 and supplies the transmission radio wave transmitted from the radio circuit 14 to the antenna 22. On the other hand, the reflected wave recovery circuit 23 is connected to the second switch circuit 25 and transfers the reflected wave or received radio wave from the antenna 22 to the second switch circuit 25. As will be described later, the reflected wave recovery circuit 23 of the present embodiment recovers the reflected wave from the antenna 22 and supplies it to the conversion circuit 20 of the power supply unit 15.

  Specifically, the power supply unit 15 is a battery unit of a charging system, and includes a power generation element 16, a rectification / boost circuit 17, a charge / discharge circuit 18, a storage element 19, and a conversion circuit 20. The charge / discharge circuit 18 supplies power of a constant voltage / current to the controller 11, the sensor 12, the memory 13, and the wireless circuit 14. The conversion circuit 20 is a circuit that converts radio wave energy into electric power, and supplies the converted electric power to the charge / discharge circuit 18 via the rectification / boost circuit 17. The storage element 19 stores power by charging from the charge / discharge circuit 18 when the operation of the sensor module 10 is stopped.

  In the present embodiment, the conversion circuit 20 is connected to the reflected wave recovery circuit 23 via the second switch circuit 25. The conversion circuit 20 converts the reflected wave recovered by the reflected wave recovery circuit 23 into electric power. In other words, the conversion circuit 20 is a kind of auxiliary power source that generates electric power from the reflected wave from the antenna 22.

[Operation of sensor module]
Hereinafter, the operation of the sensor module 10 of the present embodiment will be described with reference to the flowchart of FIG. 2 and the timing chart of FIG.

  First, the sensor module 10 maintains a standby state (sleep state) in order to suppress power consumption in a state where no earthquake occurs (step S1). In the sensor module 10, the controller 11 is activated with the occurrence of an earthquake as a trigger, and starts measurement (YES in step S2, S3). The controller 11 inputs measurement data (here, vibration value data due to an earthquake) from the sensor 12, executes a process such as data compression, and temporarily stores it in the memory 13 (step S4).

  The controller 11 collects measurement data from the sensor 12 and saves it in the memory 13 until a predetermined time is reached at a predetermined sampling frequency (step S5). Next, the controller 11 reads the measurement data stored in the memory 13, creates transmission data composed of a predetermined data unit, and outputs it to the radio circuit 14 (step S6).

  The radio circuit 14 transmits a transmission radio wave modulated with the transmission data from the controller 11 and transmits it from the antenna 22 (step S7). The radio circuit 14 continues the transmission operation until all the data stored in the memory 13 is transmitted (step S8).

  Here, the wireless circuit 14 is configured to switch the path at the time of transmission / reception by switching the contacts SW1 and SW2 of the first switch circuit 24 and the second switch circuit 25 included in the antenna unit 21 by the built-in internal controller. Execute. Thereby, the radio | wireless circuit 14 controls transmission / reception operation by a time division, as shown in FIG. Hereinafter, a specific description will be given with reference to FIGS. 1 and 3.

  The internal controller of the radio circuit 14 sets the first switch circuit 24 to the contact SW1 and the second switch circuit 25 to the contact SW2 during the transmission operation. Thus, the transmission radio wave transmitted from the radio circuit 14 is transmitted from the antenna 22 through the path to the first switch circuit 24, the reflected wave recovery circuit 23, and the antenna 22 (T1).

  Here, the transmission radio wave from the radio circuit 14 is received by the base station 92 of the sensor network and transferred to the management system 91 as shown in FIG. The management system 91 demodulates the measurement data from the transmission radio wave from the radio circuit 14.

  When such a transmission radio wave is transmitted, a reflected wave, which is a surplus radio wave, is generated from the antenna 22. The reflected wave recovery circuit 23 introduces the reflected wave from the port connected to the antenna 22 and derives it from the port connected to the second switch circuit 25. At this time, since the second switch circuit 25 is set at the contact SW2, the reflected wave recovered by the reflected wave recovery circuit 23 is transmitted through the path between the second switch circuit 25 and the power supply unit 15 and converted. Introduced into the circuit 20.

  In addition, since the reflected wave recovery circuit 23 is composed of, for example, a circulator, the port connected to the second switch circuit 25 and the port connected to the first switch circuit 24 are separated so as not to interfere with each other. That is, the reflected wave recovery circuit 23 functions as an isolator that transmits a radio wave between two ports only in one direction. Therefore, the reflected wave is not introduced into the radio circuit 14.

  The conversion circuit 20 converts the energy of the reflected wave into electric power and supplies it to the charge / discharge circuit 18 via the rectification / boost circuit 17. Thereby, the electric power converted from the reflected wave can be used as an auxiliary power source for the sensor module 10 from the charge / discharge circuit 18. Further, when the sensor module 10 is on standby, the electric power converted from the reflected wave can be stored as a standby power source by the power storage element 19.

  Here, under the control of the controller 11, the radio circuit 14 shifts to a reception operation for performing reception confirmation (AcK) for data transmission (T2). During this reception operation, the internal controller of the wireless circuit 14 sets the first switch circuit 24 to the contact SW2, and sets the second switch circuit 25 to the contact SW1. As a result, the received radio wave received by the antenna 22 is transmitted through a path including the reflected wave recovery circuit 23, the second switch circuit 25, and the first switch circuit 24, and is introduced into the radio circuit 14. The radio circuit 14 demodulates the reception confirmation (AcK) from the received radio wave and outputs it to the controller 11.

  As described above, the radio circuit 14 controls the transmission / reception operation in a time division manner as shown in FIG. 3 (T1 to T4). Thereby, there is an effect that deterioration of communication quality can be suppressed. Here, the radio circuit 14 controls the first and second switch circuits 24 and 25 to switch to the path for the transmission operation when the reception confirmation is not obtained within the specified time under the control of the controller 11. , Perform retransmission.

  Here, as described above, the sensor module 10 maintains a standby state in order to suppress power consumption when there is no occurrence of an earthquake. In this standby state, the radio circuit 14 maintains the state where the switch circuit 24 is set to the contact SW1 and the second switch circuit 25 is set to the contact SW2, as in the transmission operation. Thereby, ambient electromagnetic waves introduced from the antenna 22 are collected by the reflected wave collection circuit 23 and sent to the conversion circuit 20 of the power supply unit 15. Therefore, even when the sensor module 10 is on standby, ambient electromagnetic waves can be collected and used as auxiliary power by the conversion circuit 20.

  In short, according to the present embodiment, the reflected wave from the antenna during the transmission operation can be collected and used as auxiliary power for the sensor module 10. Further, even when the sensor module 10 is in a standby state, surrounding electromagnetic waves can be collected and used as auxiliary power. Therefore, the energy saving technology that is not easy to downsize and the auxiliary power that assists the power of the power supply unit 15 are used by using the internal configuration of the sensor module 10 without using high-frequency radio waves from the outside. be able to. Thereby, since not only the electric power from the power generation element 16 of the power supply unit 15 but also the auxiliary power can be used, the power consumption of the power supply unit 15 can be efficiently suppressed as a result.

  Here, the power conversion of the reflected wave depends on the performance of the antenna 22, but is about 10% of the power of the transmission radio wave. Therefore, it is effective to apply this embodiment as an auxiliary power source for a small-capacity power supply unit used in a small device using relatively low power.

  In the present embodiment, the configuration in which the internal controller of the wireless circuit 14 controls the first and second switch circuits 24 and 25 to switch the path when transmitting and receiving the antenna unit 21 has been described. However, the configuration is not limited to this, and the controller 11 of the sensor module 10 may control the first and second switch circuits 24 and 25. With such a configuration, a replaceable standard wireless circuit can be used as the wireless circuit 14.

  Further, as shown in FIG. 9, the above-described sensor network includes a plurality of base stations 92 and a management system 91 connected to a network 90 using an optical line or the like, and each sensor module 10-n and the base station 92 are connected. Are configured to transmit and receive measurement data by wireless communication. Each sensor module 10 -n may be configured to perform wireless communication with the base station 92 via the relay station 93. The management system 91 is, for example, a server that monitors a plant, collects various measurement data transmitted from each sensor module 10-n, and monitors and manages the plant.

[Second Embodiment]
FIG. 4 is a diagram for explaining the configuration of the power supply unit 15 of the sensor module 10 according to the second embodiment. In addition, about the structure of the main body of the sensor module 10, and the antenna unit 21, since it is the same as that of the structure shown in FIG. 1, description is abbreviate | omitted.

  The sensor module 10 of the present embodiment is configured to have a dedicated receiving antenna 40 for collecting power separately from the communication antenna 22. The power supply unit 15 is connected to the dedicated receiving antenna 40 and the conversion circuit 20.

  With such a configuration, the conversion circuit 20 can convert various radio waves received by the dedicated reception antenna 40 into electric power and recover it as auxiliary power for the power supply unit 15. Note that the conversion circuit 20 converts the reflected wave from the communication antenna 22 into electric power, as in the first embodiment shown in FIG.

  Therefore, with the sensor module 10 according to the present embodiment, it is possible to always collect the received radio wave as power together with the reflected wave from the communication antenna 22, so that the auxiliary power of the power supply unit 15 is efficiently secured. can do.

  In the case of the present embodiment, there is a possibility that mutual interference occurs between the communication antenna 22 and the dedicated reception antenna 40. Therefore, in the actual design, the relative arrangement of the antennas 22 and 40 is determined. It is necessary to consider the relationship.

[Third Embodiment]
FIG. 5 is a diagram for explaining the configuration of the sensor module 10 according to the third embodiment. In addition, about the structure similar to the sensor module 10 of 1st Embodiment with reference to FIG. 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The sensor module 10 of the present embodiment includes a radio wave intensity monitoring circuit 26, a backflow prevention element 27, a power supply monitoring circuit 28, a real-time clock circuit (hereinafter referred to as an RTC circuit) 29, and a small storage element 30. It is the composition which includes.

  The sensor module 10 of the present embodiment uses electric power obtained from the reflected wave collected by the reflected wave collecting circuit 23 of the antenna unit 21 as an individual power source for a specific circuit such as the RTC circuit 29 instead of the module body. That is, the conversion circuit 20 converts the reflected wave from the reflected wave recovery circuit 23 into electric power and supplies it to the RTC circuit 29. The RTC circuit 29 is a circuit that supplies time information to the controller 11.

  The conversion circuit 20 supplies the electric power converted from the reflected wave to the small power storage element 30. The small power storage element 30 stores the power from the conversion circuit 20 as a standby power source. The small power storage element 30 is a small capacity element using a capacitor or the like as compared with the power storage element 19 included in the power supply unit 15.

  The small power storage element 30 can be used as a power source necessary for maintaining the standby state of the RTC circuit 29 and peripheral devices when the sensor module 10 is on standby. In this case, the power storage unit 19 of the power supply unit 15 that is the main power supply has a relatively large capacity, so that charging efficiency is not good with a small current from the conversion circuit 20. On the other hand, since the small electricity storage element 30 has a small capacity, it can be constituted by an element such as a capacitor having good charging efficiency. Here, the backflow prevention element 27 can prevent current from flowing from the small storage element 30 to the reflected wave recovery circuit 23 of the antenna unit 21 via the conversion circuit 20.

  In the present embodiment, for convenience, the conversion circuit 20 and the small power storage element 30 are provided in the module body. Not limited to this, the conversion circuit 20 and the small storage element 30 may be elements included in the power supply unit 15. The conversion circuit 20 and the backflow prevention element 27 may be elements included in the antenna unit 21.

  Next, the radio wave intensity monitoring circuit 26 measures the radio wave intensity of the received radio wave introduced from the antenna 22 to the reflected wave recovery circuit 23 during the reception operation, and transmits the measurement data to the radio circuit 14. The internal controller of the radio circuit 14 controls the radio wave output during the radio transmission operation to an appropriate value based on the measurement result of the radio wave intensity transmitted from the radio wave intensity monitoring circuit 26.

  Hereinafter, with reference to FIG. 6, FIG. 7, and FIG. 8, a specific operation related to the radio wave intensity monitoring circuit 26 will be described.

  As shown in FIG. 6, the radio wave intensity depends on the communication distance. Therefore, the radio wave intensity monitoring circuit 26 measures the received radio wave intensity according to the change in reception sensitivity. The internal controller of the radio circuit 14 has table information as shown in FIG. 7, and based on the measurement result (received radio wave intensity) transmitted from the radio wave intensity monitoring circuit 26 and the reference value of the radio wave intensity at which communication is established, Determine the communication distance. That is, the internal controller of the wireless circuit 14 refers to the table information and determines that the communication distance is short, for example, about 5 m when the received radio wave intensity is relatively strong, and conversely when the received radio wave intensity is relatively weak. It is determined that the communication distance is long, for example, about 15 m.

  When it is determined that the communication distance is short, the radio circuit 14 performs control so that the transmission radio wave output transmitted during the transmission operation is reduced. Conversely, when it is determined that the communication distance is long, control is performed to increase the transmission radio wave output transmitted during the transmission operation. As a result, when the communication distance is relatively short, the transmission radio wave output is reduced, so that power consumption can be saved. Further, when the communication distance is relatively long, the transmission radio wave output is increased, so that deterioration in communication efficiency such as retransmission can be suppressed and high communication quality can be ensured.

  Next, the radio wave intensity monitoring circuit 26 measures the radio wave intensity of the reflected wave introduced from the antenna 22 to the reflected wave recovery circuit 23 during the transmission operation, and transmits this measurement data to the controller 11. That is, the radio wave intensity monitoring circuit 26 measures the radio wave intensity of the reflected wave that is transmitted from the radio circuit 14 and generated according to the transmission radio wave output during the transmission operation. Based on the measurement data transmitted from the radio wave intensity monitoring circuit 26, the controller 11 detects the occurrence of abnormality such as breakage of the antenna 22 or circuit abnormality.

  Specifically, as shown in FIG. 8, the upper and lower reference ranges for the radio wave intensity of the reflected wave are set. The controller 11 monitors the time series measurement data 80 transmitted from the radio wave intensity monitoring circuit 26, and determines that the radio wave intensity value 81 within the reference range is normal. On the other hand, the controller 11 determines that an abnormality has occurred when the radio wave intensity value 82 is out of the reference range in the time-series measurement data 80.

  When the controller 11 detects the occurrence of an abnormality, the controller 11 places information indicating the occurrence of the abnormality on the transmission radio wave from the wireless circuit 14 and transmits the information to the sensor network management system 91 shown in FIG. As a result, the management system 91 can recognize that the sensor module 10 to be managed has a problem. Therefore, failure management of the sensor module 10 can be automatically performed.

  Furthermore, as shown in FIG. 5, the power supply monitoring circuit 28 of the present embodiment monitors the input / output voltages of the power generation element 16, the rectification / boost circuit 17, the charge / discharge circuit 18, and the storage element 19. The power monitoring circuit 28 transmits information indicating the monitoring result to the controller 11. The controller 11 puts information indicating the monitoring result on the transmission radio wave from the radio circuit 14, and transmits the information to the sensor network management system 91 shown in FIG.

  With such a configuration, the sensor network management system 91 can automatically manage the state (abnormality or failure) of the power supply unit 15 of the plurality of sensor modules 10n to be managed. Specifically, for example, as shown in FIG. 10, the management system 91 creates a management table for managing the remaining battery level of the sensor module 10n, and manages the time for battery replacement.

  Further, the management system 91 can determine the transmission timing of the measurement data for each sensor module 10n with reference to the management table shown in FIG. For example, according to the transmission rate of the access point, it is possible to select a sensor module with a small remaining battery level from the management table, prioritize the transmission order, and collect measurement data from the sensor module. Accordingly, it is possible to avoid a situation in which the measurement data is lost from the sensor module due to, for example, battery exhaustion. When the management system 91 detects a sensor module that cannot transmit all measurement data, the management system 91 instructs the controller 11 of the sensor module to enter a standby state. Thereby, since the power consumption in the sensor module can be suppressed, all measurement data can be protected. All the measurement data may be collected separately from this sensor module.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10, 10n ... sensor module, 11 ... controller, 12 ... sensor,
13 ... Memory, 14 ... Radio circuit, 15 ... Power supply unit,
16 ... Power generation element, 17 ... Rectification / boost circuit, 18 ... Charge / discharge circuit, 19 ... Electric storage element
20 ... Conversion circuit, 21 ... Antenna unit, 22 ... Antenna, reflected wave recovery circuit,
24 ... 1st switch circuit, 25 ... 2nd switch circuit,
26 ... Radio wave intensity monitoring circuit, 27 ... Backflow prevention element, 28 ... Power supply monitoring circuit,
29 ... Real time clock circuit (RTC circuit), 30 ... Small power storage element,
40 ... dedicated receiving antenna, 90 ... network, 91 ... management system,
92: Base station.

Claims (8)

Radio wave transmission means for transmitting the transmission radio wave to the antenna;
Reflected wave collecting means for collecting the reflected wave from the antenna;
Conversion means for converting the reflected wave recovered by the reflected wave recovery means into electric power ;
A radio wave receiving means for inputting a received radio wave received by the antenna;
Switching means for switching the path with the reflected wave collection means,
The switching means is
During the reception operation, the received radio wave received by the antenna is transferred to the radio wave receiving means via the reflected wave collecting means,
A wireless communication apparatus configured to transfer the reflected wave or electromagnetic wave from the antenna to the conversion unit via the reflected wave collection unit during a transmission operation or a standby state except during the reception operation . Including power supply,
The converting means includes
The reflected wave radio communication apparatus according to 請 Motomeko 1 that is configured to supply to the power supply is converted into power. The reflected wave collecting means includes
3. The wireless communication apparatus according to claim 1 , further comprising circulator means for deriving a transmission radio wave transmitted from the radio wave transmission means to the antenna and introducing a reflected wave or an electromagnetic wave from the antenna. 4. . The wireless communication apparatus according to claim 1, further comprising a unit that uses electric power obtained from the conversion unit as an operation power source of a specific circuit . The power supply device includes power storage means that can be used as an auxiliary power supply,
The converting means includes
The wireless communication device according to claim 2 , configured to convert the reflected wave into electric power and supply the electric power to the power storage unit . A power supply;
Radio wave transmission means for transmitting the transmission radio wave to the antenna;
Reflected wave collecting means for collecting the reflected wave from the antenna;
Conversion means for converting the reflected wave recovered by the reflected wave recovery means into electric power and supplying the electric power to the power supply device;
A radio wave receiving means for inputting a received radio wave received by the antenna;
A wireless communication device including switching means for switching a path with the reflected wave collection means,
The switching means is
During the reception operation, the received radio wave received by the antenna is transferred to the radio wave receiving means via the reflected wave collecting means,
A wireless communication device configured to transfer the reflected wave or electromagnetic wave from the antenna to the conversion unit via the reflected wave collection unit during a transmission operation or a standby state excluding the reception operation;
Sensor means for outputting measurement data;
Control means for transmitting the transmission radio wave modulated by the measurement data from the radio wave transmission means,
The reflected wave collecting means includes
It comprises circulator means including first input / output means for deriving transmission radio waves transmitted from the radio wave transmission means to the antenna, and second input / output means for introducing reflected waves or electromagnetic waves from the antenna. ,
Switching means for switching the route with the circulator means;
The switching means is
At the time of transmission operation for transmitting the transmission radio wave, the radio wave transmission means and the first input / output means are connected, and the conversion means and the second input / output means are connected,
A sensor module configured to connect the conversion means and the second input / output means when the sensor means is in a standby state . Means for measuring the intensity of the reflected wave collected by the reflected wave collecting means;
The control means includes
Detecting an abnormality that occurs inside the sensor module based on the radio wave intensity,
The sensor module according to claim 6, wherein the sensor module is configured to transmit information indicating the detection result on a transmission radio wave from the radio wave transmission means . Radio wave sending means for sending a transmission radio wave to an antenna, reflected wave collecting means for collecting a reflected wave from the antenna, conversion means for converting the reflected wave collected by the reflected wave collecting means into electric power, and the antenna A reflected wave processing method applied to a wireless communication apparatus including a radio wave receiving unit that inputs a received radio wave received in step 1 and a switching unit that switches a path between the reflected wave collecting unit,
By the switching means, during reception operation, the received radio wave received by the antenna is transferred to the radio wave receiving means via the reflected wave collecting means,
A reflected wave processing method for transferring the reflected wave or electromagnetic wave from the antenna to the converting means via the reflected wave collecting means during the transmission operation or the standby state except the reception operation by the switching means .

Images