KR102572126B1 - Ultra-small Electromagnetic Field Strength Frequency Selective Measuring Device and Measuring method for the same - Google Patents

Abstract

Ultra-small frequency selective electromagnetic wave intensity measuring device is a three-axis isotropic antenna that receives frequencies for each of the X, Y, and Z axes, an RF switch that selects one of the X, Y, and Z axes from the three-axis isotropic antenna, and the RF switch selects A band filter for filtering frequencies, a mixer for down-converting the frequency filtered by the band filter, a connection switch connecting the band filter and the mixer, a down-pass filter for filtering the down-converted frequency by the mixer, It includes a power detector that detects power corresponding to the frequency and a controller that measures the power detected by the power detector and calculates a frequency for the detected power based on the measured power, and includes an RF switch, a band filter, a mixer, and a connection switch. , down-pass filter, power detector and controller are composed of circuits and mounted on the same main board.

Description

Ultra-small Electromagnetic Field Strength Frequency Selective Measuring Device and Measuring method for the same}

The present invention relates to a subminiature frequency-selective electromagnetic wave intensity measuring device and a measuring method using the same, and more particularly, to a miniature frequency-selective electromagnetic wave intensity measuring device having a reduced size and a measuring method using the same.

At the end of May 2011, the World Health Organization's International Agency for Research on Cancer announced that "high-frequency electromagnetic fields generated from mobile phones may cause cancer", and the IARC working group consisting of 31 experts from 14 countries, including the United States, Classifying it as a potentially cancer-causing substance, such as car engine exhaust, emphasized that mobile phone users should consider ways to reduce their exposure.

Moreover, unlike cell phones, base stations of mobile telecommunication companies not only do not allow individuals to turn on and off the equipment at will, but also add to the seriousness of the problem in that electromagnetic waves are generated 24 hours a day. Right now, the issue is limited to mobile phones, but in the mid- to long-term, the controversy over electromagnetic wave damage that occurs 24 hours a day in base stations and repeaters of mobile carriers can become even more heated.

On the other hand, the electromagnetic wave detection device according to the prior art is used only for on-site measurement of short-term exposure, and is only a device for determining the harm through a short-term measurement by a measurer visiting the site.

Therefore, considering that base stations such as CDMA and LTE are rapidly increasing, and that the amount of electromagnetic waves generated according to the amount of wireless data used also changes rapidly over time and depending on users, short-term measurements in these fields can accurately measure the amount of electromagnetic waves generated. can't judge

In addition, the current domestic standards for electromagnetic waves are presented as short-term exposure standards presented by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), and efforts for mid- to long-term standards are being researched by civic groups in each country. It is currently being announced.

In Korea, since the measurer carries the measuring devices and measures electromagnetic waves, long-term measurement in places where strong electromagnetic waves are continuously generated is impossible due to the risk of exposure of the measurer to electromagnetic waves.

Therefore, an unmanned telemetry device for electromagnetic waves to enable long-term unmanned telemetry without an external power supply capable of measuring electromagnetic wave intensity for a narrow band as well as a wide band (LF, HF, VHF, UHF) is registered as a prior art document. It was developed with No. 10-1451268.

However, limitations of existing commercial products as shown in FIG. 1, including Prior Art Document Registration No. 10-1451268, are large and heavy, so that only outdoor fixed installation is possible and indoors are limited. In addition, since the price is high, it is difficult to install it at many measurement points, requiring a lot of budget.

Accordingly, an object of the present invention is to provide a compact frequency-selective electromagnetic wave intensity measuring device and a measuring method using the same that can eliminate restrictions on indoor and outdoor installation locations, realize ease of installation, low power consumption, and can be manufactured economically at a low price.

In order to achieve the above object, a subminiature frequency selective electromagnetic wave intensity measuring device according to the present invention includes a three-axis isotropic antenna for receiving frequencies for each of the X, Y, and Z axes; an RF switch for selecting one of the X, Y, and Z axes from the three-axis isotropic antenna; a band filter filtering the frequency selected by the RF switch; a mixer down-converting the frequency filtered by the bandpass filter; a connection switch connecting the band filter and the mixer; a downband filter for filtering the frequency downconverted by the mixer; a power detector detecting power corresponding to the frequency filtered by the downlink filter; and a control unit for measuring power detected by the power detector and calculating a frequency for the detected power based on the measured power, wherein the RF switch, the band filter, the mixer, the connection switch, and the downlink band The filter, the power detector, and the controller are composed of circuits and are mounted on the same main board. The RF switch, band filter, mixer, connection switch, down-pass filter, power detector and controller are mounted on the same main board and configured as a circuit to reduce the size, design and implement the circuit simply to reduce power consumption of the device, Economic feasibility can be improved due to a low-cost configuration.

Here, if the three-axis isotropic antenna is directly connected to the main board so as to be integrated, it is preferable that the overall size can be reduced.

The band filter is preferably composed of a wide band filter and a narrow band filter capable of selectively measuring a frequency band, since it can selectively measure both a wide band frequency and a narrow band frequency.

Here, the control unit stores a band setting value, a time setting value, and a communication setting value input by a user, sets the narrowband filter based on the band setting value and the communication setting value, and Based on this, it is preferable to set the frequency bands to be measured and the measurement time to perform the measurement by controlling the setting bands of the narrowband filter to be sequentially performed according to the measurement time.

The control unit determines that the measured power is the sum of the detected power and the electric field strength value. It is calculated as , and if it is expressed together with the measurement time, it is preferable because the electromagnetic wave measurement accuracy can be improved and can be expressed.

According to the present invention, the RF switch, band filter, mixer, connection switch, down-pass filter, power detector, and controller are mounted on the same main board and configured as a circuit to reduce the size, and the circuit is simply designed and implemented to reduce power consumption of the device. There is an effect of reducing and improving the economic feasibility due to a low-cost configuration.

In addition, the overall size can be reduced, and there is an effect of selectively measuring both broadband and narrowband frequencies.

In addition, measurement can be performed by setting the frequency bands and measurement time to be measured, and the electromagnetic wave measurement accuracy can be improved and expressed.

1 is an exemplary diagram of equipment capable of monitoring electromagnetic waves by selecting an existing frequency.
2 is a perspective view of a subminiature frequency selective electromagnetic wave intensity measuring device according to the present invention.
3 is a schematic block diagram of a subminiature frequency selective electromagnetic wave intensity measuring device.
4 is a block diagram of the main components of a subminiature frequency selective electromagnetic wave intensity measuring device.
5 is an operation flowchart of a subminiature frequency selective electromagnetic wave intensity measuring device.
6 is a control block diagram of a subminiature frequency selective electromagnetic wave intensity measuring device.

Hereinafter, a subminiature frequency selective electromagnetic wave intensity measuring device 1 according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of a subminiature frequency selective electromagnetic wave intensity measuring device 1 according to the present invention.

The subminiature frequency selective electromagnetic wave intensity measuring device (1) is a device that measures and monitors electric field strength and power density in RF-EMF (Radio Frequency Electromagnetic Field) regarding the effect of exposure to electromagnetic waves on the human body in the field of EMF (Electromagnetic Field), and is a monitoring device. The direct world standard of is based on “ITU-T K.83 Monitoring of electromagnetic field levels” and refers to the international standards of higher concept. In addition, international standards for electromagnetic wave measurement are applied.

The three-axis isotropic antenna 10 of the subminiature frequency selective measuring device 1 is directly connected to the main board A to be integrated. As a result, the overall size is reduced to 1/5 or less compared to equipment capable of monitoring the strength of electromagnetic waves by selecting a conventional frequency.

The subminiature frequency selective electromagnetic wave intensity measuring device 1 is composed of a power supply, an interface of each device, a measurement value storage memory unit, and a result and device status display unit. The interface of the device is connected by UART to USB in case of wired, and selective connection of WiFi and Bluetooth is configured in case of wireless.

3 is a schematic block diagram of a subminiature frequency selective electromagnetic wave intensity measuring device 1.

It is a general and schematic diagram of a 3-axis isotropy measurement device 1 based on a variable band filter.

Referring to FIG. 3, A is a main board and includes an RF switch 20, a band selection switch 22, a band filter 30, a mixer 40, a connection switch 50, a down band filter 60, and a power detector. 70 and control unit 80 are mounted on this main board A and constituted by circuits. The triaxial isotropic antenna 10 is directly connected to the main board A to be integrated.

The subminiature frequency selective electromagnetic wave intensity measuring device 1 may further include elements other than the elements 10 to 80. The subminiature frequency selective electromagnetic wave intensity measuring device 1 includes a display unit 82, a Wi-Fi module 84, a Bluetooth (BT) module 86, a memory unit 88, a USB interface 90, AC/DC A connection unit 92 and a power supply unit 94 may be included.

The display unit 82 may display result values of electromagnetic waves and a device state. The display unit 82 displays the status according to the exposure index calculated by the controller 80. Here, the display unit 82 is composed of LEDs, and compares the exposure index calculated by the control unit 80 with the short-term exposure standard presented by the International Non-Ionizing Radiation Protection Committee, and less than 25% of the standard is a green LED, and 25% or more is a green LED. Less than 100% can light green and yellow LEDs, and more than 100% can light green, yellow and red LEDs.

In addition, the display unit 82 indicates whether the internal configuration, that is, the normal operation of the configuration mounted on the main board (A), and the connection status of the Wi-Fi module 84 and the Bluetooth (BT) module 86 and the external network. can be displayed

The wifi module 84 may transmit and receive data to the outside under the control of the control unit 80.

The Bluetooth (BT) module 86 may transmit and receive data to an external device within a predetermined distance.

The memory unit 88 may store power values measured by the control unit 80 in a log form.

The USB interface 90 is a connection unit that can be physically connected to the outside by USB.

The AC/DC connection unit 92 is a path for supplying power from the outside to the power supply unit 94 . The power supply unit 94 may supply power according to the control of the control unit 80 as an internal configuration.

In Figure 3, the RF part (10 to 60), the RF part for processing them, and the main board (A) for performing the signal measurement are the main components of the three-axis isotropic antenna, each X, Y, and Z-axis input selection The first stage consists of an RF switch 20, a wideband filter 31, and a band selection switch 22 that selects a narrowband filter 32, and a wideband filter 31 and a narrowband filter for frequency down-conversion. It consists of a connection switch (50) for selection from (32), a mixer (40) and a time setting (Local Clock generator). Here, the wideband filter 31 is composed of a wideband variable filter selected when the span bandwidth is 50 MHz or more, and the narrowband filter 32 is composed of three or more parallel frequency-selective variable filters that can be simultaneously selected by the user.

The frequency-down-converted signal goes through a down-pass filter 60 and power is detected by a power detector 70. The operation of all elements and the measurement of the detected power are processed by the RF control and signal power measurement control unit 80.

4 is a block diagram of the main components of the subminiature frequency selective electromagnetic wave intensity measuring device 1 .

The X, Y, and Z axes of the three-axis isotropic antenna 10 are connected to the RF switch 20 of the main board A. The main board (A) has a built-in RF switch (20), band selection switch (22), band filter (30), mixer (40), connection switch (50), downlink filter (60), power detector (70) And the control unit 80 and the three-axis isotropic antenna 10 will be described.

The three-axis isotropic antenna 10 is arranged so that three antennas in the X, Y, and Z axes satisfy isotropic characteristics. The three-axis isotropic antenna 10 receives frequencies for each of the X, Y, and Z axes. The shape of the three-axis isotropic antenna 10 extends in each direction from the circular body of three antennas in X, Y, and Z axes, and the connection part is formed on the opposite side of the circular body in which three antennas in X, Y, and Z axes are disposed. 3 connection parts corresponding to the three antennas in the X, Y, and Z axes are coupled to the main board (A) from the lower three areas of the cylindrical auxiliary body. Since this three-axis isotropic antenna 10 is coupled to the main board (A), it can be provided in a small size.

The RF switch 20 selects one of the X, Y, and Z axes from the three-axis isotropic antenna 10. The RF switch 20 switches the RF signal received from the 3-axis isotropic antenna 10 composed of X, Y, and Z axes and selectively transmits it to the band selection switch 22. The RF switch 20 is controlled by the control unit 30 and ensures good isolation between each input port.

The band selection switch 22 selects the RF signal input through the RF switch 20 to either the wideband filter 31 or the narrowband filter 32 at the rear. The user inputs and sets several set bands, and the control unit 80 controls the band selection switch 22 according to the set band to select one of the wideband filter 31 and the narrowband filter 32.

The band filter 30 is selected by the RF switch 10 and filters the frequency transmitted by the band selection switch 22. The band filter 30 is composed of a wide band filter 31 and a narrow band filter 32 capable of selectively measuring a frequency band. The wideband filter 31 and the narrowband filter 32 may be composed of variable bandpass filters. The narrowband filter 32 may be composed of three or more parallel frequency-selective tunable filters.

Mixer 40 down-converts the filtered frequencies in the bandpass filter.

The connection switch 50 connects the mixer 40 with any one of the wideband filter 31 and the narrowband filter 32 selected by the band selection switch 22, and the wideband filter 31 and the narrowband filter 32 ), so that the filtered frequency can be transmitted to the mixer 40.

The downband filter 60 filters the frequency down-converted by the mixer 40.

The power detector 70 detects power corresponding to the frequency filtered by the downpass filter 60.

The controller 80 measures the power detected by the power detector 70 and calculates a frequency for the detected power based on the measured power.

The control unit 80 stores the band setting value, time setting value, and communication setting value input by the user, sets a narrowband filter based on the band setting value and communication setting value, and determines the measurement time based on the time setting value. Accordingly, it is possible to control the setting band of the narrowband filter to be sequentially performed.

The controller 80 determines that the measured power is the sum of the detected power and the electric field strength value. It is calculated as , and it can be displayed together with the measurement time.

The control unit 80 calculates a measured value by calculating at least one of a maximum value, a minimum value, an average value, and an RMS average value of at least one of the electric field strength and exposure index for a predetermined time at each predetermined time. Here, the predetermined time is a time interval at which the control unit 80 calculates the measured value, and may be an interval of 6 minutes according to short-term exposure regulation standards or an interval input through a user.

5 is an operation flowchart of the subminiature frequency selective electromagnetic wave intensity measuring device 1.

The user inputs a band set value, a time set value, and a communication set value (S1).

The control unit 80 performs measurement time setting (S2).

The controller 80 sequentially controls the set band to start measurement (S3).

The controller 80 sets major mobile communication bands (S4).

The control unit 80 sets the measurement frequency band and sets the narrowband filter 32 (S5).

The controller 80 controls the RF switch 20 to select one of the X, Y, and Z axes (S6).

The controller 80 controls the band selection switch 22 to select one of the wideband filter 31 and the narrowband filter 32 (S7).

If the wideband filter 31 is selected in step S7, it is filtered by the wideband filter 31 (S8), and if the narrowband filter 32 is selected in step S7, it is filtered by the narrowband filter 32 (S9). ).

The control unit 80 controls the connection switch 50 to connect the mixer 40 to a filter selected from among the broadband filter 31 and the narrowband filter 32 (S10).

The control unit 80 controls the mixer 40 to down-convert the frequency filtered by the band filter (S11).

The power detector 70 detects power corresponding to the frequency filtered by the downlink filter 60 (S12).

The controller 80 determines that the measured power is the sum of the detected power and the electric field strength value. It is calculated as (S13).

The control unit 80 stores the measurement values for each band in the memory unit 88 in the form of a log (S14).

The control unit 80 transmits the measurement value for each band to the outside using the Wi-Fi module 84 or the Bluetooth module 86 (S15).

The control unit 80 displays the measurement values for each band on the display unit 82 so that the user can see them.

Due to the subminiature frequency selective electromagnetic wave intensity measuring device 1, the RF switch, band filter, mixer, connection switch, downlink filter, power detector and control unit are mounted on the same main board and configured as a circuit to reduce the size, By simply designing and implementing the circuit, power consumption of the device can be reduced and a low-priced configuration can be achieved.

Also, the overall size can be reduced, and both broadband and narrowband frequencies can be selectively measured. In addition, measurement can be performed by setting frequency bands and measurement time to be measured, and electromagnetic wave measurement accuracy can be improved and displayed.

1: Ultra-small frequency selective electromagnetic wave intensity measuring device
A: Main board
10: triaxial isotropic antenna 20: RF switch
22: band selection switch 30: band filter
31: broadband filter 32: narrowband filter
40: mixer 50: connection switch
60: down-band filter 70: power detector
80: control unit 82: display unit
84: WiFi module 86: Bluetooth (BT) module
88: memory unit 90: USB interface
92: AC / DC connection part 94: power supply part

Claims (5)

In the subminiature frequency selective electromagnetic wave intensity measuring device,
A three-axis isotropic antenna for receiving frequencies for each of the X, Y, and Z axes;
an RF switch for selecting one of the X, Y, and Z axes from the three-axis isotropic antenna;
a band filter filtering the frequency selected by the RF switch and comprising a wide band filter and a narrow band filter capable of selectively measuring a frequency band;
a mixer down-converting the frequency filtered by the bandpass filter;
a connection switch connecting the band filter and the mixer;
a downband filter for filtering the frequency downconverted by the mixer;
a power detector detecting power corresponding to the frequency filtered by the downlink filter;
a controller for measuring the power detected by the power detector and calculating a frequency for the detected power based on the measured power;
a Wi-Fi module for connecting to a network to upload the measured electromagnetic wave intensity value to an external device; and
Including a Bluetooth module for connection with a mobile device for setting the Wi-Fi module,
The RF switch, the band filter, the mixer, the connection switch, the down-pass filter, the power detector, and the controller are composed of circuits and are mounted on the same main board,
The control unit,
Stores the band setting value, time setting value and communication setting value input by the user, sets the narrowband filter based on the band setting value and the communication setting value, and according to the measurement time based on the time setting value The narrowband filter is controlled to be set sequentially, the RF switch 20 is controlled to select one of the X, Y, and Z axes, and one of the wideband filter and the narrowband filter is selected. and controls the connection switch to connect a filter selected from among the broadband filter and the narrowband filter to the mixer, controls the mixer to down-convert the frequency filtered by the bandpass filter, and The power corresponding to the frequency is controlled to be detected by the power detector, and the measured power is the sum of the detected power and the electric field strength value. A subminiature frequency selective electromagnetic wave intensity measuring device, characterized in that it is calculated and expressed together with the measurement time.
According to claim 1,
The three-axis isotropic antenna is a subminiature frequency selective electromagnetic wave intensity measuring device, characterized in that directly connected to the main board to be integrated.
According to claim 1,
The Bluetooth module is connected to an external device, set to search and connect a Wi-Fi application through an application, and uploads the measured electromagnetic wave intensity value to the external device.
delete delete

Images