JPH11331099A - Reception method and device in communication system using magnetic vector potential - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the receiver that selectively receives in an excellent way an electric field caused by a time change of magnetic vector potential in the communication system where the magnetic vector potential is used for a signal propagation medium. SOLUTION: A 2-way radio channel 3 using a magnetic vector potential is provided between a relay base station 1 and a terminal 2. The relay base station 1 and terminal 2 are provided with a receiver 12, 22 respectively with a electric field sensor that is electrically shielded from a noise electric field and senses an electric field produced by a time change of the propagated magnetic vector potential.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a communication system using a magnetic vector potential as a signal propagation medium.
The present invention relates to a method and an apparatus for receiving an electric field generated by a time change of a magnetic vector potential.

[0002]

2. Description of the Related Art
The use of electromagnetic waves such as radio waves and microwaves is widely known as a general communication means. However, such electromagnetic waves are easily shielded by obstacles, and there are many cases where transmission and reception of signals are hindered depending on the place and environment of use.
Further, since the frequency band used by electromagnetic waves is limited to a relatively narrow band by the Radio Law, radio interference due to interference is also a serious problem. Furthermore, communication systems using electromagnetic waves, such as mobile phones, have leakage electromagnetic waves of several hundred milligauss, which may cause malfunctions of precision equipment at short distances, leading to various troubles and adverse effects on the human body. The possibility cannot be ignored. Under such circumstances, development of a new communication means capable of solving the above problem is desired.

By the way, the magnetic vector potential is
Its existence has been confirmed by electron beam holography interference experiments (Phys. Rev. Lett. 48, 1443 (19
82)). However, this magnetic vector potential is only used for observation of magnetic domains or observation of magnetic flux and magnetic flux quantum by electron beam holography, and has not been used practically at present. The present inventors have paid attention to using magnetic vector potential as a communication medium (Japanese Patent Application No. 9-323516).

First, the concept of the magnetic vector potential will be briefly described. FIG. 1 is an explanatory diagram of a magnetic vector potential. FIG. 1 shows a solenoid having a built-in soft magnetic material, and N, S generated at both ends of the soft magnetic material when an alternating current I is applied to a winding wound on a semi-infinite rod. Magnetic flux density generated inside magnetic poles and rods * B
(Hereinafter, the vector components are indicated with an asterisk (*), and the vector B is expressed as * B), and the magnetic vector potential * A (hereinafter, the vector A is expressed as * A).

The magnetic flux density * B generated inside the magnetic material by the application of the alternating current is represented by the x-axis and the y-axis in the directions parallel to the cross section of the rod as shown in FIG. At the observation point P whose distance is r, it is expressed by the following equation (1). * B = (B _x , B _y , B _z ) = (0,0, B) (1) Here, the magnetic flux density * B generally satisfies the following equation (2). (3)
It is possible to define the magnetic vector potential * A from the definition equation. div * B = 0 (2) * B = rot × * A (3)

Assuming that the radius of the rod is r ₀ and its cross-sectional area is S, the total magnetic flux Φ of the rod is given by the following equation (4).
From the equation (3), the magnetic vector potential * A is expressed by the following equations (5A) and (5B) for the outside and inside of the rod, respectively. Here, * i and * j represent in-plane coordinates of the cross section of the bar. Φ = BS (4) * A = Φ (−y * i + x * j) / 2πr ² (r> r ₀ ) (5A) * A = Φ (−y * i + x * j) / 2πr ₀ ² (r ≦ r ₀₎ ... (5B)

On the other hand, the magnetic vector potential * A is
According to Stokes' theorem, the following equation (6) must always be satisfied. It can be easily confirmed that Expression (6) is satisfied by a simple calculation.

[0008]

(Equation 1)

In order for the Stokes theorem to hold, the magnetic vector potential * A must always be continuous. Therefore, since it is impossible to physically shield the magnetic vector potential * A, the magnetic vector potential becomes a signal having very good transparency as a communication medium, and can be expected as a new communication system.

When the gauge function φ is used by substituting the above equation (3) into the following Maxwell equation (7), the electric field * E becomes the following equation (8). This equation (8) shows that the temporal change of the magnetic vector potential * A directly generates the electric field * E. rot × * E = -∂ * B / ∂t (7) * E = -∂ * A / ∂t + grad · φ (8)

Here, since it is assumed that there is no charge in the region under consideration, a radiation gauge can be adopted, and grad · φ = 0 can be set. Therefore, the electric field * E observed outside the soft magnetic rod (r> r ₀ ) is as shown in the following equation (9), and its absolute value decreases in inverse proportion to the distance r from the center of the rod. You can see that * E = (∂Φ / ∂t) · (y * i−x * j) / 2πr ² (r> r ₀ ) (9)

Therefore, in order to increase the strength of the magnetic vector potential * A, it is sufficient to increase the total magnetic flux Φ.
Further, in order to increase the intensity of the electric field * E as a signal to be received, ∂Φ / ∂t (the amount of time change of the total magnetic flux Φ)
Need to be larger. Therefore, a favorable communication system can be realized by increasing the temporal change amount of the magnetic flux as much as possible.

As a result of studying the transmission method and the reception method of the magnetic vector potential defined above, the present inventors have processed a soft magnetic material having a high electric resistance such as soft ferrite into a toroidal core, and then wound the wire. It has been found that a relatively high-intensity electric field can be generated by applying a high-frequency current to the conductor to generate an electric vector potential. In addition, it was found that by using a high-sensitivity electric field sensor in which the detection unit is shielded by an electric field, it is possible to selectively detect an electric field generated by a temporal change of a magnetic vector potential with high accuracy even in a weak electric field. By developing such knowledge, communication using magnetic vector potential is possible even at a sufficiently long distance.

The present invention has been made in view of such circumstances, and an electric field generated by a time change of a magnetic vector potential is detected by an electric field sensor shielded by an electric field, so that a communication system using a magnetic vector potential can be used. An object of the present invention is to provide a receiving method and a receiving device that can dramatically improve the receiving sensitivity of a propagation signal.

Another object of the present invention is to provide a receiving method and a receiving apparatus which greatly assist in realizing a communication system using a magnetic vector potential.

[0016]

According to a first aspect of the present invention, there is provided a communication method using a magnetic vector potential in a communication system using a magnetic vector potential as a signal propagation medium. In a receiving method of receiving an electric field as a propagation signal, an electric field sensor which is shielded against an electric field which is unrelated to a magnetic vector potential serving as a signal propagation medium detects an electric field caused by a temporal change of a magnetic vector potential. And

According to a second aspect of the present invention, there is provided the receiving method in the communication system using the magnetic vector potential according to the first aspect, wherein the magnetic vector potential is generated by passing an alternating current through a soft magnetic material having a winding. There is a feature.

According to a third aspect of the present invention, there is provided a communication system using a magnetic vector potential as a signal propagation medium, wherein the receiving device receives an electric field generated by a time change of the magnetic vector potential as a propagation signal. Receiving device,
An electric field sensor is provided which is shielded from an electric field irrelevant to a magnetic vector potential serving as a signal propagation medium and detects an electric field generated by a time change of the magnetic vector potential.

According to a fourth aspect of the present invention, there is provided the receiving apparatus in the communication system using the magnetic vector potential according to the third aspect, wherein the electric field sensor is a resonance type electric field sensor.

According to a fifth aspect of the present invention, there is provided a receiving apparatus in a communication system using a magnetic vector potential according to the third or fourth aspect, wherein the detecting portion of the electric field sensor is shielded with an electric field by a conductive metal material.

According to a sixth aspect of the present invention, there is provided a receiving apparatus in a communication system using a magnetic vector potential, wherein the detecting section of the electric field sensor is shielded by a metal material grounded. Features.

According to a seventh aspect of the present invention, there is provided a receiving apparatus in a communication system using a magnetic vector potential according to the third or fourth aspect, wherein the detecting section of the electric field sensor is shielded by a soft magnetic material.

According to the first and third aspects, the electric field whose magnitude changes in accordance with the time variation of the propagated magnetic vector potential is shielded from a noise electric field irrelevant to the propagated magnetic vector potential. Detected by sensor. Therefore, the oscillating electric field due to the magnetic vector potential can be accurately detected without being affected by the surrounding electric field.

According to the second aspect, an alternating current is applied to the wound soft magnetic material to generate a magnetic vector potential. Therefore, a magnetic vector potential can be generated efficiently.

According to the fourth aspect, a resonance type electric field sensor is used as the electric field sensor. Therefore, since only the electric field component having the same frequency as the resonance frequency can be detected, the electric field component leaked from various devices, that is, the electric field component which becomes a noise in the communication system using the magnetic vector potential is removed, and the reception accuracy is reduced. Is improved.

According to the present invention, the periphery of the detection section of the electric field sensor is shielded with a highly conductive metal material to eliminate a noise electric field.

According to the present invention, the metallic material serving as the shielding material is grounded, so that external noise electromagnetic waves are efficiently removed.

In the seventh aspect, the periphery of the detecting portion of the electric field sensor is shielded with an electric field by a soft magnetic material, so that the oscillating electric field generated by the propagation of the magnetic vector potential is efficiently absorbed.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 3 is a schematic diagram showing an outline of a communication system to which the present invention is applied. In FIG. 3, reference numeral 1 denotes a relay base station, and 2 denotes a terminal device. The area between the relay base station 1 and the terminal device 2 is, for example, an area where radio interference occurs or a place where it is difficult to install a wired line. A bidirectional wireless line 3 is provided.

The relay base station 1 generates a magnetic vector potential and sends the generated magnetic vector potential to the terminal device 2 via the wireless line 3, and a time change of the magnetic vector potential transmitted from the terminal device 2 via the wireless line 3. And a receiving device 12 for capturing an electric field generated by the electric field and converting the electric field into a desired output signal. In addition, the terminal device 2 generates an electric vector potential and sends the generated electric vector potential to the relay base station 1 via the wireless link 3, and a time change of the magnetic vector potential transmitted from the relay base station 1 via the wireless link 3. And a receiving device 22 that captures the electric field generated by this and converts it into a desired output signal.

First, the transmitting devices 11 and 21 will be described. FIG. 4 is a block diagram illustrating a configuration of the transmitting devices 11 and 21. The transmitting devices 11 and 21 include a voltage modulator 31 that outputs a voltage modulated according to various input signals, a current converter 32 that converts the modulated voltage into a current, and a soft magnetic material that flows the converted current through a winding. And a magnetic vector potential generator 33 for generating a magnetic vector potential from

FIG. 5 is a diagram showing an example of the magnetic vector potential generator 33, and FIG.
FIG. 5B is a sectional view thereof. 5A and 5B, reference numeral 41 denotes a toroidal core as a soft magnetic material. A winding 42 is wound around the toroidal core 41. In order to increase the amount of time change of the magnetic vector potential, that is, the electric field strength, as much as possible, a soft magnetic material having high transmittance, low eddy current loss, and high electrical resistance Mn−
Zn ferrite is used.

The sectional area of the toroidal core 41 is S, its magnetic permeability is μ, the radius of the magnetic path length at the center of the cross section is a, the number of turns of the winding 42 is N, and the winding 42 has a frequency f and a maximum value I ₀ . When a current is applied, assuming that ω = 2πf, the current I flowing through the winding 42 is expressed by the equation (10), and the magnetic field H generated in the toroidal core 41 is expressed by the equation (11). I = I ₀ sinωt (10) H = NI / 2πa (11)

Accordingly, the magnetic flux density B inside the toroidal core 41 is expressed by the equation (12), and the magnetic flux Φ is expressed by the equation (13). B = μH = μNI / 2πa (12) Φ = BS = SμNI / 2πa (13)

The time variation ΔΦ / Δt of the magnetic flux is expressed by the equation (14). By substituting the equation (14) into the equation (9), the surface obtained by dividing the toroidal core 41 into two equal parts is obtained. The electric field * E generated at a distance of r from the center in is as shown in equation (15). Here, * i and * j represent in-plane coordinates of the cross section of the toroidal core 41. _{∂Φ / ∂t = SμNωI 0 cosωt /} 2πa = SμNfI 0 cosωt / a ... (14) * E = SμNfI 0 cosωt (y * i-x * j) / 2πar 2 ... (15)

However, this equation (15) is based on the consideration of one cross section of the toroidal core 41. Actually, as shown in FIG. 5B, a magnetic vector potential is generated by two cross sections. , It is necessary to find an electric field based on both magnetic vector potentials.

The toroidal core 4 as shown in FIG.
1 of section A, the electric field by B * E _A, in order to obtain the * E _B, converts the equation (15) x, y coordinates. Field * E _A by section A, when the origin at the center of the toroidal core 41, (15) the x, y, the coordinates of r (16) ~ (18) may be transformed as expression. Note that α is an angle between the central axis (z-axis) of the toroidal core 41 and the distance * r, as shown in FIG. x = r cosα-a ... ( 16) y = r sinα ... (17) r 2 = x 2 + y 2 = a 2 + r 2 -2ra cosα ... (18) These (16) to (18) above ( by substituting 15), the electric field * E _a by section a is as (19).

[0038]

(Equation 2)

Since the magnetic flux density * B according to the section B is in the opposite direction to that of the section A, the electric field * E _B according to the section _B becomes
The coordinates x, y, and r in equation (15) may be converted as in equations (20) to (22). x = r cos α + a (20) y = r sin α (21) r ² = x ² + y ² = a ² + r ² + 2ra cos α (22) These equations (20) to (22) are converted to the above equation (15). by substituting the electric field by the cross section B * E _B is as (23).

[0040]

(Equation 3)

The sum of the expressions (19) and (23) is the electric field * E generated by the toroidal core 41. Therefore, the electric field * E to be obtained is as shown in equation (24).

[0042]

(Equation 4)

From equation (24), it can be seen that a high magnetic field strength can be obtained by using a soft magnetic material having a high magnetic permeability for the toroidal core 41 and passing a high-frequency current through the winding 42.

When the frequency of the flowing current is increased, electromagnetic waves are radiated. Therefore, it is preferable to provide a means for shielding the radiated electromagnetic waves in the magnetic vector potential generator 33. FIG. 6 is a view showing an example of the radiated electromagnetic wave shielding means. FIG. 6 (a) is a plan view thereof, and FIG. 6 (b) is a sectional view thereof. 6A and 6B, FIG.
The same parts as in (a) and (b) are given the same numbers.

Toroidal core 41 provided with winding 42
Is a metal box 4 to shield the electric field from other devices
3 The lead wire of the winding wire 42 extending from the toroidal core 41 to the outside is inserted through a metal pipe 44 for shielding the electric field. These metal boxes 43
The metal pipe 44 is grounded.

By sealing the soft magnetic toroidal core 41 with a metal plate (metal box 43) having excellent electrical conductivity, radiated electromagnetic waves from other devices can be shielded. Further, by grounding the metal plate (metal box 43), radiated electromagnetic waves can be reflected. In addition, even if the toroidal core 41 is sealed with a soft material having high radio wave absorption efficiency, the shielding efficiency of the radiated electromagnetic wave can be improved. Such a shield has no effect on the shielding of the magnetic vector potential, and thus has no influence on the generation of the magnetic vector potential.

If the generated electric field is too high, it may affect peripheral devices, cause malfunctions of various precision devices, and adversely affect the human body.
Therefore, it is necessary to suppress the generated electric field to within several hundred mV / m. This is very small compared to an electric field generated from a potential due to static electricity (thousands of volts).

As the generator of the magnetic vector potential, a solenoid type having a built-in soft magnetic material may be used in addition to the toroidal type as described above. However, in the case of the solenoid type, it is necessary to shield the magnetic field generated by the N and S magnetic poles generated at both ends of the rod-shaped core.

Next, the receiving devices 12, 22 will be described. FIG. 7 is a block diagram showing a configuration of the receiving devices 12 and 22. Each of the receiving devices 12 and 22 includes an electric field sensor 51 that detects an electric field generated by a time change of a magnetic vector potential, and a converter 52 that converts a measured electric field into a current or a voltage and outputs a desired signal.

As the electric field sensor 51, basically any type of sensor having a high sensitivity may be used, and various electric field sensors such as a loop antenna can be used. However, an electric field sensor such as a loop antenna has a large size, so that it is difficult to shield the electric field, cannot be carried, and is not suitable for use. Therefore, in this example, a case will be described below in which a resonance type electric field sensor that is optimal for measuring an electric field generated by a time change of a magnetic vector potential is used for the electric field sensor 51.

FIG. 8 is a schematic diagram showing the configuration of an example of the resonance type electric field sensor. In FIG. 8, reference numeral 61 denotes a cylindrical dielectric. Silver metal electrodes 6 on both ends of the dielectric 61
2 and 62 are provided, and both metal electrodes 6
2, 62 are connected. Both ends of the lead wire 63 are connected to the primary coil of the transformer 64,
A voltmeter 65 is connected to the secondary coil.

The electric field is measured by examining, using a voltmeter 65, the electromotive force at the time of LC resonance when the charge induced by the oscillating electric field flows through the lead wire 63 at both ends of the dielectric 61. At this time, the resonance frequency is adjusted to match the frequency of the magnetic vector potential.

When this resonance type electric field sensor is used, since only electric field components having the same frequency are selectively received, there is an advantage that electric field components having different frequencies leaked from various devices are hardly measured. At this time, if the relative dielectric constant of the dielectric 61 is as high as possible, the detection unit of the sensor can be downsized. In addition, the smaller the imaginary part of the dielectric constant at the resonance frequency, the higher the Q value, which has the effect of improving the S / N ratio.

It is preferable to provide a means for shielding the electric field sensor 51 so as not to be affected by a leaked electric field from another device. FIG. 9 is a view showing an example of a means for shielding the leaked electric field, and FIG.
(B) is a sectional view thereof. 9A and 9B, the same parts as those in FIG. 8 are denoted by the same reference numerals.

The dielectric 61 having the metal electrodes 62, 62 formed at both ends is housed in a metal box 66 for shielding an electric field from another device. Also, the metal electrodes 62, 6
2 connected to the lead wire 6 and drawn out of the dielectric 61
Reference numeral 3 is inserted through a metal pipe 67 for shielding an electric field. This metal box 66 is grounded.

As described above, the detection portion of the electric field sensor 51 is sealed with a metal plate (metal box 66) having excellent electric conductivity,
By grounding the metal plate (metal box 66), the reception accuracy can be improved. It should be noted that the reception accuracy can be improved even when the detection unit of the electric field sensor 51 is sealed with a soft material having high radio wave absorption efficiency.

Although a commercially available high-sensitivity sensor can be used as the electric field sensor 51, if the electric field sensor 51 is used as it is, electric fields generated from various devices such as electric appliances are measured and the S / N ratio is measured. Decrease. Therefore, the above-mentioned shield structure is indispensable.

In particular, in the case of a magnetic vector potential having a frequency of 10 kHz or less, a metal material is preferable as a shield material. In the case of a magnetic vector potential having a frequency exceeding 100 kHz, a shield material should be selected according to the frequency. Is desirable. Further, since the magnetic field to be observed is an alternating magnetic field, the influence of the electrostatic field due to the human body and the organic body can be completely ignored. On the other hand, since the received electric field has a very weak intensity, the adverse effect on the human body can be almost ignored. In addition, since such a shielding means has no effect on the shielding of the magnetic vector potential, it does not affect the generation of the magnetic vector potential at all. Since the electric field generated by the time change of the magnetic vector potential has no shielding effect by the electric field shield as described above, the signal strength does not decrease due to the communication environment, and the S / N ratio does not decrease due to surrounding electromagnetic waves.

Oscillating devices 11 and 21 each having the magnetic vector potential generator 33 having the above configuration,
By using the receiving devices 12 and 22 including the electric field sensor 51 having the above-described configuration, bidirectional communication using the magnetic vector potential between the relay base station 1 and the terminal device 2 can be performed. That is, in actual communication, a voltage modulated according to various input signals is converted into a current, a magnetic vector potential is generated from a soft magnetic material, and an electric field caused by a time change thereof is observed on a receiving side, and the electric field is measured. The measurement result may be converted into a current or a voltage and taken out as a desired output signal. As described above, the magnetic vector potential can construct a communication system similar to the conventional communication using electromagnetic waves, and enables communication in an environment where conventional wireless communication is impossible.

Next, the magnetic vector potential generator 3
3 and a specific example of the electric field sensor 51 will be described.

The magnetic vector potential generator 33
It was produced as follows. Mn-Zn ferrite having a relative dielectric constant of 5000 as a soft magnetic material was prepared by using an outer diameter of 40 m.
m, an inner diameter: 30 mm, a cross section: 10 mm, formed into a toroidal core shape.
A 2 mm copper wire was wound 500 turns to form a winding 42. In order to shield a radiated electromagnetic wave generated from the winding 42 when a current having a frequency of 20 kHz flows, the winding 42
Is sealed with a metal box 43 made of permalloy having an outer diameter of 51 mm, an inner diameter of 23 mm, and a height of 17 mm. 43 and the metal pipe 44 were grounded.

On the other hand, the electric field sensor 51 was manufactured as follows. A cylindrical dielectric (diameter: 50 mm, length: 50 mm) having a relative dielectric constant of 10000 is subjected to a hole processing with a diameter of 2 mm around its central axis to form a cylindrical dielectric 61. Silver is applied to the upper and lower surfaces and baked to form metal electrodes 62, 62. Lead wires 63, 63 are taken out from each metal electrode 62, 62 and connected to a transformer 64 having a self-inductance of 18 mH. A resonance type electric field sensor having a resonance frequency of 20 kHz measured by the voltmeter 65 was manufactured.

FIG. 10 shows the frequency characteristics of the output voltage in this resonance type electric field sensor. It was confirmed that the manufactured resonance type electric field sensor exhibited a maximum voltage at a frequency of approximately 20 kHz. FIG. 11 shows the relationship between the output voltage and the oscillating electric field in this resonance type electric field sensor. It was found that the produced resonance type electric field sensor had an output voltage proportional to the electric field.

Using such a resonance type electric field sensor, the effective value of the electric field was measured when the electric field was shielded with a material having magnetic properties as shown in Table 1 and when the electric field was not shielded at all. Table 2 shows the measurement results. However, the magnetic vector potential generator 3 is set so that the center axis of the dielectric 61 is parallel to the z-axis of the toroidal core 41.
3 and the electric field sensor 51 were positioned. The distance between the center of the magnetic vector potential generator 33 and the electric field sensor 51 was always set to 0.25 m so that the electric field shielding effect became remarkable. Judgment of good or bad as an electric field sensor
0.80 or more in the ratio of the calculated value to the measured value of the electric field was determined to be suitable, and less than 0.80 was determined to be non-conforming. That is, whether the electric field component of the background is 20% was set as the threshold value, and the determination of the conformity or the non-conformity was made.

[0065]

[Table 1]

[0066]

[Table 2]

As is evident from the results in Table 2, if the detecting portion of the electric field sensor is shielded with a metal having excellent electric conductivity or a soft ferrite having excellent radio wave absorption efficiency, the radiated electromagnetic wave can be efficiently shielded. . By shielding the detection unit of the electric field sensor with an electric field, the observed electric field based on the magnetic vector potential agrees well with the calculated value, and it can be seen that the electric field intensity does not decrease due to the shield.

In a conventional communication system using electromagnetic waves, since electromagnetic waves are easily shielded by obstacles, communication failures are likely to occur. On the other hand, in the communication using the magnetic vector potential, the transparency is remarkably superior to that of the conventional communication system, and the communication failure hardly occurs.

[0069]

As described above, in the first and third aspects, the electric field generated by the time change of the magnetic vector potential is received by the electric field sensor shielded by the electric field, so that the magnetic vector potential is used as the communication medium. The receiving sensitivity of the receiving device in the communication system can be dramatically improved. As a result, it is a great help for putting such a communication system into practical use. Further, the present invention can be applied to a wireless cable for connecting various devices.

According to the second aspect of the present invention, the magnetic vector potential is generated by passing an alternating current through the wound soft magnetic material, so that the magnetic vector potential can be generated efficiently.

Furthermore, since the resonance type electric field sensor is used, only electric field components having the same frequency as the resonance frequency can be detected, and the receiving accuracy can be improved.

Further, since the electric field shield around the detecting portion of the electric field sensor is made of a highly conductive metal material, an external noise electric field can be efficiently removed, and the receiving accuracy can be improved.

Further, since the metal material serving as the shield material is grounded, external noise electromagnetic waves can be efficiently removed, and the receiving accuracy can be improved.

Furthermore, in the present invention, the periphery of the detecting portion of the electric field sensor is shielded by a soft magnetic material having high electromagnetic wave absorption efficiency, so that the oscillating electric field generated by the propagation of the magnetic vector potential can be efficiently absorbed. The receiving accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the concept of a magnetic vector potential according to the present invention.

FIG. 2 is a sectional view of a soft magnetic body.

FIG. 3 is a schematic diagram showing an outline of a communication system to which the present invention is applied.

FIG. 4 is a block diagram illustrating a configuration of a transmitting device.

FIG. 5 is a schematic diagram showing a configuration of a magnetic vector potential generator.

FIG. 6 is a schematic diagram showing an electromagnetic wave shield state of the magnetic vector potential generator.

FIG. 7 is a block diagram illustrating a configuration of a receiving device.

FIG. 8 is a schematic diagram showing a configuration of an electric field sensor.

FIG. 9 is a schematic diagram showing an electric field shield state of the electric field sensor.

FIG. 10 is a graph showing a frequency characteristic of an output voltage in the electric field sensor.

FIG. 11 is a graph showing a relationship between an output voltage and an oscillating electric field in an electric field sensor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 relay base station 2 terminal device 3 wireless circuit 11, 21 transmitting device 12, 22 receiving device 33 magnetic vector potential generator 41 toroidal core 42 winding 51 electric field sensor 61 dielectric 62 metal electrode 63 lead wire 64 transformer 65 voltmeter 66 metal Box 67 Metal pipe

Claims (7)

[Claims] In a communication system using a magnetic vector potential as a signal propagation medium, in a receiving method for receiving an electric field generated by a time change of the magnetic vector potential as a propagation signal, the communication method is independent of a magnetic vector potential as a signal propagation medium. 1. A receiving method in a communication system using a magnetic vector potential, wherein an electric field generated by a time change of a magnetic vector potential is detected by an electric field sensor shielded from the electric field. 2. The receiving method in a communication system using magnetic vector potentials according to claim 1, wherein said magnetic vector potentials are generated by passing an alternating current through a soft magnetic material having a winding. 3. In a communication system using a magnetic vector potential as a signal propagation medium, a receiving apparatus for receiving an electric field generated by a time change of the magnetic vector potential as a propagation signal is independent of a magnetic vector potential as a signal propagation medium. A receiving device in a communication system using magnetic vector potentials, comprising: an electric field sensor that is shielded from an electric field that is generated and detects an electric field generated by a time change of a magnetic vector potential. 4. The receiving apparatus according to claim 3, wherein the electric field sensor is a resonance type electric field sensor. 5. The receiving apparatus in a communication system using magnetic vector potentials according to claim 3, wherein the detection unit of the electric field sensor is shielded by an electric field with a conductive metal material. 6. The receiving apparatus in a communication system using magnetic vector potentials according to claim 3, wherein the detection unit of the electric field sensor is shielded by a metal material grounded. 7. A receiving apparatus in a communication system using magnetic vector potentials according to claim 3, wherein the detecting section of the electric field sensor is shielded by a soft magnetic material.