TWM586856U - Electromagnetic wave measurement experiment teaching aid - Google Patents

Abstract

The present invention provides an electromagnetic wave measurement experiment teaching aid, which includes a transmitting device, a receiving device, an ultrasonic wave transmitting and receiving unit, and an angle measuring unit. The receiving device includes a casing, a control module, and a receiving unit. The control module is electrically and the receiving unit is disposed in the casing. The ultrasonic wave transmitting and receiving unit and the angle measuring unit are arranged outside the housing. The control module is electrically connected to the receiving unit, the ultrasonic wave transmitting and receiving unit and the angle measuring unit, and is used to measure the size of the electromagnetic wave, between the transmitting device and the receiving device. Distance and angle. The electromagnetic wave measurement experiment teaching aid described in the present invention will improve the accuracy of the electromagnetic wave experiment and increase the user's interest in operation.

Description

Electromagnetic wave measurement experiment teaching aid

The novel model provides an electromagnetic wave measurement experimental teaching aid, which is beneficial to the operation and observation of the messenger.

Electromagnetism is a very important branch of physics, in which there is a close and inseparable relationship between electricity and magnetism. Electromagnetism is mainly a subject that explores the interaction between electricity and magnetism, but under normal circumstances, neither magnetic force nor electricity is obvious to humans. Therefore, for students who are initially studying electromagnetics, they often only flow in the calculation formulas. This will make it difficult for students to understand the actual phenomenon of electromagnetics, and it will cause students to feel repulsive to electromagnetics and fail to gain knowledge from it.

One object of the present invention is to provide an electromagnetic wave measurement experimental teaching aid, which is mainly connected to a receiving unit, an ultrasonic transmitting and receiving unit, and an angle measuring unit through a control module to measure the intensity and transmitting device of the electromagnetic wave. The distance and included angle from the receiving device are helpful for simplifying the steps of the electromagnetic wave measurement experiment and improving the accuracy of the experiment.

One object of the present invention is to propose an electromagnetic wave measurement experimental teaching aid, in which a control module is used to transmit measured data to an electronic device and / or a display unit, and to display and / or display through the electronic device and / or display unit. Or store the measured data.

One object of the present invention is to propose an electromagnetic wave measurement experimental teaching aid, in which a transmitting device and a receiving device are respectively disposed on two different slide rails, and one end of the two slide rails is connected through a connecting shaft, so that the two slide rails It can be rotated relatively to change the included angle between the transmitting device and the receiving device. A rotary variable resistor is arranged on the connecting shaft and is electrically connected to the control module. When the two slide rails rotate relative to each other, the rotary variable resistor is driven to rotate, and the resistance value of the rotary variable resistor is changed. The control module can calculate the included angle between the transmitting device and the receiving device from the measured resistance value of the rotary variable resistor.

To achieve the above object, the present invention provides an electromagnetic wave measurement experimental teaching aid, including: a transmitting device for generating an electromagnetic wave; and a receiving device including: a casing; a control module disposed in the casing; a receiving The unit is arranged in the casing, and is electrically connected to the control module, and is used to receive the electromagnetic waves generated by the transmitting device. An ultrasonic transceiver unit is arranged outside the casing, and is electrically connected to the control module, and is used to transmit and receive an ultrasonic wave. Acoustic signals, in which the control module and the ultrasonic transceiver unit measure the distance between the transmitting device and the receiving device through the ultrasonic signals; and an angle measuring unit, which is arranged outside the casing and is electrically connected to the control module, where the transmitting When the device and the receiving device rotate, the angle measuring unit will be driven to rotate, so that the control module and the angle measuring unit are used to measure the angle between the transmitting device and the receiving device.

The new model provides another electromagnetic wave measurement experiment teaching aid, including: a first slide rail; a first slide seat arranged on the first slide rail for displacement along the first slide rail; a second slide rail, the first One end of the two slide rails is connected to one end of the first slide rail through a connecting shaft; a second slide base is disposed on the second slide rail for displacement along the second slide rail; and a launching device is connected to the first slide base. And is used to emit an electromagnetic wave; a receiving device connected to the second slide includes: a casing; a control module is disposed in the casing; a receiving unit is disposed in the casing and is electrically connected to the control module and used To receive the electromagnetic wave generated by the transmitting device; and a rotary variable resistor, which is arranged on the connecting shaft connecting the first slide base and the second slide base and is electrically connected to the control module, wherein the first slide rail and the second When the slide rail is relatively rotated with the connecting shaft as the axis, the included angle between the transmitting device and the receiving device will be changed, and the rotary variable resistor will be driven to rotate, so that the resistance value of the rotary variable resistor is changed, and the control module is Resistance value by rotary variable resistor Known angle between the first rail and the second rail.

The electromagnetic wave measurement experiment teaching aid includes: a first slide rail; a first slide base for carrying a transmitting device, and arranged on the first slide rail to be displaced along the first slide rail; a second A slide rail, one end of the second slide rail is connected to one end of the first slide rail through a connecting shaft; and a second slide seat is used for carrying the receiving device, and is arranged on the second slide rail to follow the second slide rail. Displacement, in which the first slide rail and the second slide rail are relatively rotated with the connecting shaft as the axis, and the angle between the transmitting device and the receiving device is changed.

In the electromagnetic wave measurement experiment teaching aid, the angle measurement unit includes a rotary variable resistor, which is arranged on a connecting shaft connecting the first slide rail and the second slide rail. When the first slide rail and the second slide rail are opposite to each other, When rotating, the rotary variable resistor will be driven to change the resistance value of the rotary variable resistor, and the control module is worth knowing between the first slide rail and the second slide rail based on the resistance of the rotary variable resistor. Angle.

In the electromagnetic wave measurement experiment teaching aid, the receiving device includes a display unit electrically connected to the control module, and is used to display the included angle between the transmitting device and the receiving device, the distance between the transmitting device and the receiving device, and the receiver receiving The size of the electromagnetic wave.

In the electromagnetic wave measurement experiment teaching aid, the control module includes a wireless transmission unit or a wired transmission unit, and is used for interposing the angle between the transmitting device and the receiving device, the distance between the transmitting device and the receiving device, and / or receiving. The magnitude of the electromagnetic wave received by the transmitter is transmitted to an electronic device.

The electromagnetic wave measurement experiment teaching aid includes a switch unit electrically connected to a control module.

The electromagnetic wave measurement experiment teaching aid includes a sensitivity adjustment unit electrically connected to a control module.

Please refer to FIG. 1, which is a perspective view of an embodiment of the novel electromagnetic wave measurement experiment teaching aid. As shown in the figure, the electromagnetic wave measurement teaching aid 10 according to the embodiment of the present invention includes a transmitting device 11 and a receiving device 13, where the transmitting device 11 is used to generate an electromagnetic wave, and the receiving device 13 is used to receive the transmitting device 11 Generated electromagnetic waves.

The receiving device 13 includes a housing 131, a control module 133, and a receiving unit 135. The control module 133 is electrically connected to the receiving unit 135. Specifically, the receiving unit 135 is configured to receive the electromagnetic waves generated by the transmitting device 11 and transmit the received electromagnetic waves to the control module 133. In an embodiment of the present invention, the receiving unit 135 may be an antenna for transmitting the received electromagnetic wave to the control module 133, and the control module 133 measures the magnitude of the electromagnetic wave, such as a voltage value.

The control module 133 and the receiving unit 135 are both disposed in the housing 131. For example, the housing 131 may include a main body portion 1311 and a receiving portion 1313. The receiving portion 1313 is similar in appearance to a horn, and has a hollow structure that penetrates back and forth. A narrower end (end) of the receiving portion 1313 is connected to the main body portion 1311. The control module 131 is disposed in the main body portion 1311, and the receiving unit 135 is disposed at the end of the receiving portion 1313.

The electromagnetic wave measurement experiment teaching aid 10 may include an ultrasonic wave transmitting and receiving unit 17, which is electrically connected to the control module 133 and is disposed outside the casing 131. The ultrasonic transceiver unit 17 is used to transmit and receive an ultrasonic signal. The control module 133 and the ultrasonic transceiver unit 17 measure the distance between the receiving device 13 and the transmitting device 11 through the ultrasonic signal.

Specifically, the ultrasonic transceiver unit 17 includes a transmitter and a receiver. When in use, the control module 133 can trigger the transmitter to transmit an ultrasonic signal, such as a 40 kHz ultrasonic signal, and project the ultrasonic signal to the transmitting device. 11, and the receiver is used to receive the ultrasonic signal reflected by the transmitting device 11. The control module 133 can calculate the distance between the transmitting device 11 and the receiving device 13 by the time difference between the ultrasonic transceiver unit 17 transmitting and receiving the ultrasonic signal.

In an embodiment of the present invention, the transmitting device 11 may be disposed on the first carriage 151, and the receiving device 13 may be disposed on the second carriage 153, and the ultrasonic transceiver unit 17 may be disposed on the second carriage 153 on.

The receiving device 13 may also include an angle measurement unit 19 electrically connected to the control module 133, wherein the angle measurement unit 19 is disposed outside the casing 131. The control module 133 may be combined with the angle measurement unit 19 and measure an included angle between the receiving device 13 and the transmitting device 11. The angle measuring unit 19 will rotate with the rotation of the shooting device 11 and the receiving device 13 so that the control module 133 and the angle measuring unit 19 can be used to measure the angle between the transmitting device 11 and the receiving device 13 and measure the angle. The detailed setting and usage of the unit 19 will be described in detail in the following embodiments.

In an embodiment of the present invention, the receiving device 13 may further include a display unit 137 electrically connected to the control module 133 and disposed on an outer surface of the casing 131. Specifically, the display unit 137 can receive and display the included angle between the transmitting device 11 and the receiving device 13 and the size of the electromagnetic wave received by the receiving unit 135, such as a voltage value or a current value, by the control module 133. The display unit 137 is only an embodiment of the present invention, and is not a limitation of the scope of the right of the present invention. In practical applications, the receiving device 13 may also choose not to provide the display unit 137.

In another embodiment of the present invention, the receiving device 13 may also include a switch unit 132 and / or a sensitivity adjustment unit 134, wherein the control module 133 is electrically connected to the switch unit 132 and / or the sensitivity adjustment unit 134. The switch unit 132 is used to turn the control module 133 on or off, and the sensitivity adjustment unit 134 is used to adjust the sensitivity of the control module 133 to receive electromagnetic signals, or to adjust the magnification of the voltage value or current value displayed by the display unit 137. . For example, the sensitivity adjusting unit 134 may be a variable resistor. The user can operate and adjust the resistance value of the variable resistor, thereby changing the sensitivity of the control module 133 to sense the electromagnetic wave signal, or adjusting the display of the display unit 137. The ratio of the voltage or current value.

In an embodiment of the present design, the receiving device 13 may also include a standing wave switch, and the user may choose to connect the standing wave receiver or the microwave receiver through the standing wave switch, which is beneficial to improving convenience during use.

Please refer to FIG. 2 for a block diagram of some components of the novel electromagnetic wave measurement teaching aid. As shown in the figure, the control module 133 is electrically connected to the receiving unit 135, the ultrasonic transceiver unit 17, the angle measurement unit 19, the switch unit 132, the sensitivity adjustment unit 134, and / or the display unit 137, among which the switch unit 132 and sensitivity adjustment The unit 134 and the display unit 137 are not necessary components of the present embodiment.

The control module 133 includes a processing unit 1331, a wireless transmission unit 1333, a memory unit 1335, a wired transmission unit 1337, and a plurality of connection interfaces 1339. For example, the control module 133 may be an ESP32 controller. The processing unit 1331 is used to transport and control the connected devices, the memory unit 1335 is used to store the received data and calculation programs, and the wireless and wired transmission units 1333/1337 are used to transmit data by wire or wireless respectively.

The control module 133 can be connected to the receiving unit 135, the ultrasonic transmitting / receiving unit 17, the angle measuring unit 19, the switching unit 132, and / or the sensitivity adjusting unit 134 through the connection interface 1339, and the signals are received by each device. In addition, the control module 133 can also be connected to the display unit 137 through the connection interface 1339, and send a signal to the display unit 137 for display. For convenience of illustration, the control module 133 in FIG. 2 is connected to each device through a connection interface 1339, but in actual application, the control module 133 may be connected to the same device through a plurality of connection interfaces 1339.

In practical applications, the receiving unit 135 can transmit the received electromagnetic wave signal to the control module 133, and the control module 133 can know the strength of the received electromagnetic wave signal, such as a voltage value, and transmit the voltage value of the electromagnetic wave to the display unit. 137 is displayed.

In addition, the control module 133 can drive the ultrasonic transceiver unit 17 to send an ultrasonic signal and receive the ultrasonic signal reflected by the transmitting device 11. The processing unit 1331 of the control module 133 can calculate the time difference between the ultrasonic transceiver unit 17 transmitting and receiving the ultrasonic signals, and calculate the distance between the transmitting device 11 and the receiving device 13.

In an embodiment of the present invention, the angle measuring unit 19 may be a rotary variable resistor. When the transmitting device 11 and the receiving device 13 are relatively rotated, the rotary variable resistor will be rotated and the resistance of the rotary variable resistor will be changed. The control module 133 calculates the included angle between the transmitting device 11 and the receiving device 13 from the resistance value of the rotary variable resistor, and transmits the included angle data to the display unit 137 for display, and the detailed settings of the angle measurement unit 19 The method will be described in detail in the following embodiments.

In an embodiment of the present invention, the control module 133 can also wirelessly transmit data to the external electronic device 12 via the wireless transmission unit 1333, for example, the size (voltage value) of the electromagnetic wave through a wireless transmission interface such as wifi or Bluetooth. The angle and distance between the transmitting device 11 and the receiving device 13 are transmitted to a mobile phone, tablet computer or computer. Of course, the control module 133 can also be connected to the external electronic device 12 through the wired transmission device 1337, and transmit the data to the electronic device 12, such as the voltage value of the electromagnetic wave, the angle and the distance between the transmitting device 11 and the receiving device 13 through a USB cable. To your phone, tablet or computer. Therefore, the display unit 137 may not be provided on the receiving device 133, and the related measurement data may be directly displayed and received through the external electronic device 12.

Please refer to FIG. 3 and FIG. 4, which are an exploded perspective view and a three-dimensional schematic view of an embodiment of the novel electromagnetic wave measurement experiment teaching aid, respectively. As shown in the figure, the electromagnetic wave measurement experimental teaching aid 20 includes a first slide rail 21, a second slide rail 23, a transmitting device 11, a receiving device 13 and an angle measuring unit 19, wherein the angle measuring unit 19 may It is a rotary variable resistor 25.

The first slide base 151 is connected to and carries the launching device 11 and is disposed on the first slide rail 21. The second slide base 153 is connected to and carries the receiving device 13 and is disposed on the second slide rail 23. As shown in FIGS. 1 and 2, the receiving device 13 may include a housing 131, a control module 133, and a receiving unit 135. The control module 133 is electrically connected to the receiving unit 135 and receives the transmitting device by the receiving unit 135. 11 Generated electromagnetic waves.

The first sliding base 151 and the transmitting device 11 can be displaced along the first sliding rail 21, and the second sliding base 153 and the receiving device 13 can be displaced along the second sliding rail 23 to change the distance between the transmitting device 11 and the receiving device 13 distance.

One end of the first slide rail 21 is connected to one end of the second slide rail 23 through a connecting shaft 24, so that the first slide rail 21 and the second slide rail 23 can rotate relative to the shaft 24 by connecting the shaft 24, and change the transmitting device 11 and receiving The angle between the devices 13.

The rotary variable resistor 25 is disposed on a connecting shaft 24 connecting the first slide rail 21 and the second slide rail 23, and is electrically connected to the control module 133. When the first slide rail 21 and the second slide rail 23 rotate relative to each other with the connecting shaft 24 as the axis, and the angle between the transmitting device 11 and the receiving device 13 is changed, the rotary variable resistor 25 will be driven to rotate and change The resistance value of the rotary variable resistor 25, and the control module 133 can know the angle between the first slide rail 21 and the second slide rail 23 based on the resistance of the rotary variable resistor 25.

Specifically, the rotary variable resistor 25 includes a main body portion 251 and a rotary portion 253. The rotary portion 253 can be rotated relative to the main body portion 251 to change the resistance value of the rotary variable resistor 25. A first perforation 211 is provided at one end of the first slide rail 21, and a second perforation 231 is provided at one end of the second slide rail 23. The body portion 251 of the rotary variable resistor 25 is disposed at the second of the second slide rail 23. The perforation 231 is inside, and the rotating part 253 is disposed in the first perforation 211 of the first slide rail 21. When the first slide rail 21 rotates relative to the second slide rail 23, the rotating portion 253 of the rotary variable resistor 25 is driven to rotate relative to the main body portion 251, and the resistance value of the rotary variable resistor 25 is changed.

The control module 133 is electrically connected to the rotary variable resistor 25 and is used to measure the resistance of the rotary variable resistor 25. Since the resistance value of the rotary variable resistor 25 is related to the rotation angle of the rotating portion 253 and the main body portion 251 Therefore, the control module 133 can calculate the rotation angle and the included angle of the first slide rail 21 and the second slide rail 23 from the measured resistance value of the rotary variable resistor 25.

In an embodiment of the present invention, as shown in FIG. 2, the control module 133 may transmit the measured angle to the display unit 137 and / or the electronic device 12, and display and / or display through the display unit 137 and / or the electronic device 12. Or save angle information.

In actual application, the first slide rail 21 and the second slide rail 23 can be adjusted to be a straight line, and then the power of the receiving device 13 is turned on. At this time, the control module 133 sets the current angle to 0 degrees. Then the control module 133 will issue an instruction, and the user can adjust the first slide rail 21 and the second slide rail 23 to 90 degrees, so that the angle setting of the control module 133 can be completed.

In one embodiment of the present invention, the electromagnetic wave measurement teaching aid 20 may further include a top plate 271 and a base 273, wherein one end of the first slide rail 21 is connected to one end of the second slide rail 23, and the top plate 271 is disposed at the first Above the slide rail 21 and the second slide rail 23, and the bottom plate 273 is disposed below the first slide rail 21 and the second slide rail 23, so that the first slide rail 21 and the second slide rail 23 are located on the top plate 271 and the base 273 between.

In practical applications, the top plate 271, the first slide rail 21, the second slide rail 23, and / or the bottom plate 273 may also be fixed and connected through the connection shaft 24. For example, the connection shaft 24 may be a screw.

During the experiment, a member such as a fence, a reflecting plate, or a cymbal can be placed on the angle indicating plate 191, and experiments such as diffraction, reflection, or refraction of electromagnetic waves can be performed.

In an embodiment of the present invention, the electromagnetic wave measurement experiment teaching aid 20 may also be provided with a display unit 137, a wireless transmission unit 1333, a wired transmission unit 1337, an ultrasonic transceiver unit 17, a switch unit 132, and And / or components such as the sensitivity adjustment unit 134.

The above is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of implementation of the present invention. That is to say, all equivalent changes and modifications to the shape, structure, characteristics, and spirit described in the scope of the patent application for the new invention and Modifications shall be included in the scope of patent application for this new model.

10‧‧‧Electromagnetic wave measurement experiment teaching aid
11‧‧‧ launching device
12‧‧‧ electronic device
13‧‧‧ receiving device
131‧‧‧shell
1311‧‧‧Main body
1313‧‧‧Receiving Department
132‧‧‧ switch unit
133‧‧‧Control Module
1331‧‧‧Processing unit
1333‧‧‧Wireless Transmission Unit
1335‧‧‧Memory Unit
1337‧‧‧Wired Transmission Unit
1339‧‧‧Interface
134‧‧‧Sensitivity adjustment unit
135‧‧‧Receiving unit
137‧‧‧display unit
151‧‧‧First Slide
153‧‧‧Second Slide
17‧‧‧ Ultrasonic Transceiver Unit
19‧‧‧Angle measurement unit
20‧‧‧Electromagnetic wave measurement experiment teaching aid
21‧‧‧ the first slide
211‧‧‧first perforation
23‧‧‧Second slide
231‧‧‧second perforation
24‧‧‧ connecting shaft
25‧‧‧Rotary variable resistor
251‧‧‧Body
253‧‧‧Rotating part
271‧‧‧Top plate
273‧‧‧base

Figure 1: A perspective view of an embodiment of the novel electromagnetic wave measurement experimental teaching aid.

FIG. 2 is a block diagram of an embodiment of the novel electromagnetic wave measurement experiment teaching aid.

Figure 3: An exploded perspective view of another embodiment of the novel electromagnetic wave measurement experimental teaching aid.

FIG. 4 is a schematic perspective view of another embodiment of the novel electromagnetic wave measurement experiment teaching aid.

Claims (10)

An electromagnetic wave measurement experiment teaching aid includes:
A transmitting device for generating an electromagnetic wave; and a receiving device including:
A shell
A control module disposed in the casing;
A receiving unit is disposed in the casing, is electrically connected to the control module, and is used for receiving the electromagnetic wave generated by the transmitting device;
An ultrasonic transmitting and receiving unit is disposed outside the casing, is electrically connected to the control module, and is used to transmit and receive an ultrasonic signal. The control module and the ultrasonic transmitting and receiving unit measure the ultrasonic signal through the ultrasonic signal. The distance between the transmitting device and the receiving device; and an angle measuring unit, which is arranged outside the casing and is electrically connected to the control module, wherein the transmitting device and the receiving device will drive the angle measuring unit when rotating The rotation makes the control module and the angle measurement unit measure the angle between the transmitting device and the receiving device. The electromagnetic wave measurement experimental teaching aid as described in the first patent application scope, including:
A first slide
A first slide base for carrying the launching device and arranged on the first slide rail to be displaced along the first slide rail;
A second slide rail, one end of which is connected to one end of the first slide rail through a connecting shaft; and a second slide seat for carrying the receiving device and disposed on the second slide rail, Displacement along the second slide rail, wherein the first slide rail and the second slide rail are relatively rotated around the connecting shaft as an axis, and an included angle between the transmitting device and the receiving device is changed. According to the electromagnetic wave measurement experiment teaching aid according to item 2 of the scope of patent application, wherein the angle measurement unit includes a rotary variable resistor, which is disposed on the connecting shaft connecting the first slide rail and the second slide rail, When the first slide rail and the second slide rail are relatively rotated, the rotary variable resistor will be driven to rotate to change the resistance value of the rotary variable resistor, and the control module is controlled by the rotary variable resistor. The resistance of the variable resistor is worth knowing the angle between the first slide rail and the second slide rail. According to the electromagnetic wave measurement experimental teaching aid as described in the third item of the patent application scope, wherein the receiving device includes a display unit electrically connected to the control module, and is used to display the angle between the transmitting device and the receiving device, and the transmitting device The distance from the receiving device and the size of the electromagnetic wave received by the receiver. According to the electromagnetic wave measurement experiment teaching aid according to item 3 of the patent application scope, wherein the control module includes a wireless transmission unit or a wired transmission unit, and is used for an angle between the transmitting device and the receiving device, and the transmitting device The distance to the receiving device and the magnitude of the electromagnetic wave received by the receiver are transmitted to an electronic device. The electromagnetic wave measurement experimental teaching aid as described in the first item of the patent application scope includes a switch unit electrically connected to the control module. The electromagnetic wave measurement experimental teaching aid as described in the first item of the patent application scope includes a sensitivity adjustment unit electrically connected to the control module. An electromagnetic wave measurement experiment teaching aid includes:
A first slide
A first slide seat disposed on the first slide rail for displacement along the first slide rail;
A second slide rail, one end of which is connected to one end of the first slide rail through a connecting shaft;
A second slide seat disposed on the second slide rail for displacement along the second slide rail;
A transmitting device connected to the first slide base and used to emit an electromagnetic wave;
A receiving device connected to the second carriage includes:
A shell
A control module disposed in the housing;
A receiving unit is disposed in the casing, and is electrically connected to the control module, and is used to receive the electromagnetic wave generated by the transmitting device; and a rotary variable resistor is provided to connect the first slide base and the second The transmission shaft and the control module are electrically connected to the connection shaft of the slide base, wherein when the first slide rail and the second slide rail rotate relative to each other around the connection shaft, the transmitting device and the receiving device will be changed. The included angle drives the rotary variable resistor to rotate, so that the resistance of the rotary variable resistor changes, and the control module is worth knowing the first slide rail and the resistance of the rotary variable resistor. An angle between the second slide rails. According to the electromagnetic wave measurement experiment teaching aid according to item 8 of the patent application scope, wherein the receiving device includes a display unit electrically connected to the control module, and is used to display the angle between the transmitting device and the receiving device and the receiver. The size of the electromagnetic wave received. According to the electromagnetic wave measurement experiment teaching aid according to item 8 of the patent application scope, wherein the control module includes a wireless transmission unit or a wired transmission unit, and is used for an angle between the transmitting device and the receiving device and the receiver The magnitude of the received electromagnetic wave is transmitted to an electronic device.