JP2010028247A - Antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for reducing noise which generates with a cause of an electric field generated around an antenna for precision improvement when specifying a position direction of a generating source of an electromagnetic wave using the existing antenna. <P>SOLUTION: The respective centers of three sets of coils having the outer surface covered with sheaths made of non-magnetic material conductor are agreed, their axes intersect perpendicularly each other, and moreover the antenna device is composed from the respective three sets of coils. The sheaths function to reduce noise which generates with a cause of the electric field generated around the antenna device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an antenna device for detecting an electromagnetic wave transmitted from an arbitrary place in space and accurately specifying the transmission source.

  In order to specify the position and direction of the electromagnetic wave generation source using an existing antenna, it takes time and effort to manually change the direction of the antenna and perform measurement several times. Further, for example, even if the position direction of the electromagnetic wave generation source is specified by the measuring means, the direction of the antenna used for the measurement is fixed manually. Therefore, when the hand is shaken, the direction of the antenna is also shaken, and it is difficult to keep the direction of the antenna fixed. Therefore, the sensing direction of the antenna does not always continue to accurately point the position direction of the electromagnetic wave generation source, and it is considered difficult to specify the accurate position direction of the electromagnetic wave generation source.

As an example of a conventional apparatus for measuring electromagnetic waves, the invention described in Patent Document 1 is given. The invention according to Patent Document 1 can perform high-accuracy measurement of electromagnetic waves by using three coils that are orthogonal to each other.
JP 59-197874 A

  However, Patent Document 1 connects three coils that are orthogonal to each other in series, and even though the intensity of the magnetic field component of the electromagnetic wave generated in the three-dimensional space can be measured, the electromagnetic wave that the three coils separately receive separately. The intensity of the magnetic field component cannot be measured for each coil, and therefore cannot be used to specify the direction of electromagnetic wave generation. Including the invention according to Patent Document 1, an apparatus capable of specifying the position of the electromagnetic wave generation source without changing the direction of the antenna has not been realized.

  In view of this, the present inventor previously described in the Japanese Patent Application No. 2007-252852 using the antennas formed by combining three coils so that the respective centers coincide and the respective axes are orthogonal to each other. By measuring the electromotive force generated by each coil of the coil receiving the magnetic field component of the electromagnetic wave and examining the positional relationship between the antenna and the electromagnetic wave generation source, a means for specifying the generation direction of the electromagnetic wave is provided.

  However, in the antenna device described in Japanese Patent Application No. 2007-252852 and the triaxial magnetic detector described in Patent Document 1, the electromagnetic wave receiving portion is mainly composed of a loop-shaped coil. When detecting the electromotive force using a loop-shaped coil, the ground that is the ground potential point is caused by an electric field generated between the high-voltage device around the electromagnetic wave generation source and the ground that is the ground potential point. And a potential difference is generated between the loop coil. Then, the loop coil receives the potential difference as noise when detecting the electromotive force. The noise prevents accurate detection of the electromotive force by the loop coil. Therefore, the generation of the potential difference is inconvenient for specifying the position of the electromagnetic wave generation source using the loop coil. In this way, including the inventions of Patent Document 1 and Japanese Patent Application No. 2007-252852, the generation of electromagnetic waves without changing the direction of the antenna and without receiving the contribution of the potential difference generated between the electromagnetic wave receiving portion and the ground potential point No device has been realized that can locate the source.

  The present inventor covers each of the three sets of coils constituting the composite coil portion of the antenna device described in Japanese Patent Application No. 2007-252852 with a sheath made of a non-magnetic conductive material, and connects to the oscilloscope using a coaxial cable. The electromotive force was measured. At that time, one end of the coil wire of the coil was connected to the inner conductor of the coaxial cable, the other end was connected to the outer conductor, and the sheath and the outer conductor were also connected. As a result, a measurement result was obtained in which the noise was reduced by about 20 dB compared with the case where the sheath was not provided in the antenna device. From this result, the coil for electromagnetic wave detection is covered with a sheath made of a non-magnetic conductor material, and the sheath is connected to an outer conductor of a coaxial cable that connects the coil and the measuring instrument device. It is considered that the potential difference generated between the ground and the coil can be canceled.

  Therefore, in this patent application, it is configured by combining three coils whose outer sides are covered with a sheath made of a nonmagnetic conductor material so that their centers coincide with each other and their respective axes are orthogonal to each other. An antenna device is provided.

  More specifically, first, as a first invention, a composite coil portion formed by combining three sets of coils in which the respective centers coincide with each other and the respective axes are orthogonal to each other, and the external electromagnetic wave generates the coil. An antenna device comprising: a detection unit that detects an electromotive force for each coil; a cable with a ground shield that connects the coil and the detection unit; and a sheath unit made of a nonmagnetic conductor material that covers the coil wire of the coil. provide.

  Next, as a second invention, there is provided the antenna device according to the first invention, wherein one end of the sheath portion is grounded via a shield of a cable with a ground shield.

  Next, as a third invention, the first invention or the first invention in which a first matching capacitor for impedance matching is arranged between the coil wire on the other end side of the sheath and the axis of the cable with the ground shield. An antenna device according to the second invention is provided.

  Next, as a fourth invention, the first matching capacitor for impedance matching is arranged between the coil wire on one end side of the sheath portion and the coil wire on the other end side of the sheath portion. An antenna device according to any one of the third inventions is provided.

  Next, as a fifth invention, any one of the first to fourth inventions further comprising a first azimuth calculation unit that calculates the azimuth of the electromagnetic wave generation source according to the electromotive force of each coil detected by the detection unit. An antenna device according to claim 1 is provided.

  Next, as a sixth invention, the electromotive force of the drive unit capable of driving the composite coil unit so as to change the direction of the coil in the combined state and the specific coil detected by the detection unit is maximized. The first to first driving control units for controlling the driving unit and the second direction calculating unit for calculating the direction of the electromagnetic wave generation source from the direction of the coil when the electromotive force of the specific coil becomes maximum. An antenna device according to any one of the fifth inventions is provided.

  Next, as a seventh invention, there is provided the antenna device according to any one of the first to sixth inventions, wherein each coil is a planar coil.

  Next, as an eighth invention, the composite coil section provides the antenna device according to any one of the first to seventh inventions configured by winding each coil wire around a sphere.

  Next, as a ninth invention, the composite coil portion is described in any one of the first to seventh inventions configured by winding each coil wire around an annular guide for winding the coil wire in a circle. An antenna device is provided.

  Next, as a tenth aspect of the invention, the composite coil section provides the antenna device according to any one of the first to seventh aspects of the present invention configured by winding each coil wire around a cube.

  Next, as an eleventh aspect of the invention, the composite coil portion is configured by winding each coil wire around a rectangular annular guide for winding a square outline. An antenna device according to any one of the above is provided.

  Next, as a twelfth invention, there is provided the antenna device according to any one of the first to eleventh inventions, wherein each of the coil wires has a plurality of turns.

  The sheath portion in the antenna device of the present invention is made of a nonmagnetic conductor material and grounded, thereby canceling the potential difference generated between the ground as the ground potential point and each coil of the composite coil portion. Is possible. Therefore, the noise can be reduced. Therefore, an antenna device capable of specifying the position of the electromagnetic wave generation source with higher accuracy is realized.

  Moreover, it is possible to achieve impedance matching between the composite coil portion and the ground shielded cable by installing a capacitor between the coil wire on the other end side of the sheath portion and the axis line of the ground shielded cable. . As a result, an antenna device capable of specifying the position of the electromagnetic wave generation source with higher accuracy is realized.

Hereinafter, embodiments of the present invention will be described. Note that the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the spirit of the present invention. In addition, the relationship between the following embodiment and a claim is as follows.
The first embodiment will mainly describe Claims 1, 2, and 12.
The second embodiment will mainly describe claims 3 and 12.
The third embodiment will mainly describe claims 4 and 12.
The fourth embodiment will mainly describe claims 5 and 12.
The fifth embodiment will mainly describe claims 6 and 12.
The sixth embodiment will mainly describe claims 7 and 12.
The seventh embodiment will mainly describe claims 8, 10, and 12.
The eighth embodiment will mainly describe Claims 9, 11, and 12.
<< Embodiment 1 >>
<Outline of Embodiment 1>

The present embodiment relates to an antenna device configured by combining three sets of coils whose outer sides are covered with a sheath made of a nonmagnetic conductor material so that the respective centers coincide with each other and the respective axes are orthogonal to each other. Explain. This antenna device is mainly used to search for a location where dielectric breakdown occurs in equipment in a power plant or substation. Further, it can be used for searching for a place of electric leakage in a factory and specifying a source of illegal radio waves.
<Functional configuration of Embodiment 1>

  FIG. 1 is a functional block diagram of the antenna device according to this embodiment. As shown in FIG. 1, the antenna device (0101) according to this embodiment includes a composite coil part (0102), a detection part (0103), a ground shielded cable (0104), and a sheath part (0105). Become.

  (Description of Composite Coil Portion) The composite coil portion (0102) is configured by combining three sets of coils whose centers are aligned and whose axes are orthogonal to each other. FIG. 2 shows an example of the configuration of the antenna device according to the present embodiment. As illustrated in FIG. 2, the composite coil unit according to the present embodiment includes three coils (0201 to 0203). The three coils (0201 to 0203) are combined such that their centers coincide with each other and their axes are orthogonal to each other. The three coils (0201 to 0203) each generate an electromotive force according to a change in unit time of a magnetic field component of an electromagnetic wave to be received. The electromotive force generated in the three coils (0201 to 0203) is transmitted to the detection unit via the ground shielded cable.

  As described above, the coils of the three coils (0201 to 0203) are arranged so that their axes are orthogonal to each other. Therefore, for example, the coil (0201) having an opening surface in the front-rear direction in FIG. 2 receives only the component in the front-rear direction of the magnetic field component of the electromagnetic wave to be received. In FIG. 2, the coil (0202) having an opening surface in the left-right direction receives only the left-right component of the magnetic field component of the electromagnetic wave to be received. In addition, the coil (0203) having an opening surface in the vertical direction in FIG. 2 receives only the vertical component of the magnetic field component of the electromagnetic wave to be received. As described above, the composite coil unit according to the present embodiment makes it possible to decompose and receive the magnetic field component of the electromagnetic wave to be received for each of the three axial components orthogonal to each other. Then, by comparing the electromotive force generated for each of the coils by the reception, it is possible to specify the generation source of the electromagnetic wave to be received. Note that the comparison of the electromotive forces is performed by the detection unit (0103) or an arithmetic processing device further provided in the antenna device according to the present embodiment (details will be described in the fourth embodiment).

  In addition, each of the three coils is covered with a sheath (0204 to 0206) made of a nonmagnetic conductor material that constitutes the sheath portion (0105) (specifically, description of the sheath portion (0105)). I will explain it in the section). Each coil is connected to a ground shielded cable (0210-0212).

  In FIG. 2, the three coils (0201 to 0203) have a circular shape, but they do not necessarily have a circular shape. The centers of the three coils, such as a square shape, a rectangular shape, and a trapezoidal shape, are aligned with each other. Any shape can be used as long as it has no problem in constructing it so as to be orthogonal to. Further, the “matching each center” does not necessarily have to be matched so that there is no error. In FIG. 2, a single coil wire is used for each of the three coils (0201 to 0203). However, the types of the coils are made to coincide with each other and the axes are orthogonal to each other. Any coil may be used as long as it does not interfere with the construction. For example, a solenoid coil or a planar coil may be used. The impedances of the three coils (0201 to 0203) are preferably the same. When calculating the intensity of the magnetic field component of the detected electromagnetic wave of each of the three coils (0201 to 0203) in the detection unit (0103), it is necessary to consider the difference in impedance between the three coils (0201 to 0203). This is to avoid it. The areas of the three coils (0201 to 0203) are preferably the same. When calculating the intensity of the magnetic field component of the detected electromagnetic wave of each of the three coils (0201 to 0203) in the detection unit (0103), it is necessary to consider the difference in area of each of the three coils (0201 to 0203). This is to avoid it. For each of the three coils (0201 to 0203), an output proportional to the number of turns can be obtained by winding the coil wire of each coil a plurality of times. Thereby, the sensitivity of the antenna device can be increased.

  (Description of Detection Unit) The detection unit (0103) detects the electromotive force generated in the coil by the external electromagnetic wave for each coil.

  Here, “external electromagnetic wave” refers to a magnetic field component of an electromagnetic wave generated outside the antenna device and a magnetic field generated outside the antenna device.

  The detection unit can be configured by a device that performs signal processing and transmits the detected electromotive force to an arithmetic processing device, that is, a signal processing device. As for the signal processing device, for example, when the intensity or generation source of the magnetic field component of the electromagnetic wave from the outside is determined by an arithmetic processing device such as a PC based on the detected electromotive force, the detected electromotive force is converted into a digital signal A A / D board or the like can be used. In addition, it is also possible to use a detection unit in which the signal processing device and the arithmetic processing device are integrated. More specifically, a general-purpose oscilloscope (0213) can be used as illustrated in FIG. As described above, a more compact antenna device can be realized by using the detection unit (0103) in which the signal processing device and the arithmetic processing device are integrated.

  (Description of Cable with Ground Shield) A cable with ground shield (0104) connects the coil and the detector.

  As this grounded shielded cable (0104), it is preferable to use a general-purpose coaxial cable as an example. It is also possible to use a feeder wire that simply insulates the positive electrode side and the negative electrode side. In addition, about the cable used as a cable with a ground shield, it is necessary to select from various cables suitably according to the frequency band of the electromagnetic waves to receive. For example, if the received electromagnetic wave is generated from a wireless device, it is preferable to use a coaxial cable having an M-type connector as an example. Further, when the received electromagnetic wave is a VHF wave or a UHF wave, a feeder line can be used as an example.

  Further, it is preferable that the conductor on the ground shield side of the cable with ground shield (0104) is grounded. As an example of the grounding, the grounding can be performed via the detection unit (0103).

  (Explanation about the sheath portion) The sheath portion (0105) is made of a nonmagnetic conductor material covering the coil wire of the coil. As illustrated in FIG. 2, the sheath portion according to the present embodiment includes a sheath (0204 to 0206) that covers each of the three coils (0201 to 0203) constituting the composite coil portion. In FIG. 2, the sheath (0204 to 0206) has a substantially circular shape according to the shape of each coil wire of the three coils (0201 to 0203). However, this is an example. About the said sheath, it is also possible to use the thing of a substantially coil | winding shape. The sheath (0204 to 0206) can also cover a coil wire wound a plurality of times.

  The sheath portion (0105) has a function of canceling a potential difference generated between the ground as a ground potential point and the composite coil portion (0102). FIG. 3 illustrates a function in which the sheath portion according to the present embodiment cancels a potential difference generated between the ground as a ground potential point and the composite coil portion.

FIG. 3A shows a state in which an electromagnetic wave (0307) derived from a partial discharge generated from a dielectric breakdown part (0306) of a power transmission line (0302 to 0304) is received using an antenna device having no sheath part. In FIG. 3 (a), the composite coil portion is represented by only one coil wire (0305) in order to simplify the description. An electric field is generated between the power transmission lines (0302 to 0304) and the ground as the installation potential point. The electric field causes a potential difference between the composite coil portion (0305) and the ground as the installation potential point. When this state is represented as a circuit diagram, it is as shown in the circuit diagram of FIG. The frequency of the electromagnetic wave derived from the partial discharge generated from the dielectric breakdown part (0309) of the power transmission line (0310) is several ks ⁻¹ to several Ms ⁻¹ . When the frequency of the electromagnetic wave derived from the partial discharge is converted into a wavelength, the value becomes considerably longer than the length of each coil of the composite coil. Therefore, strictly speaking, each coil can be handled as a distributed constant circuit. This is the same even when each coil receives a magnetic field component of an electromagnetic wave having the same frequency band as the electromagnetic wave derived from the partial discharge. When each coil can be handled as a distributed constant circuit, as shown in FIG. 3B, each coil can be expressed as a series of a plurality of coils (0308). Here, each of the plurality of coils is referred to as a virtual coil (0323 to 0326). As described above, an electric field is generated between the power transmission line (0310) and the ground (0311 to 0314) which is the ground potential point. The electric field forms capacitance spaces (0315-0322) between the power transmission line (0310) and the coils, and between the ground (0311 to 0314), which are ground potential points, and the coils. . The capacitance spaces (0319 to 0322) generated between the coils and the ground (0311 to 0314) serving as ground potential points cause the coils and the ground (0311 to 0314) serving as ground potential points. A potential difference occurs between them. Since the grounds (0311 to 0314), which are ground potential points, exist in different places, the capacitance spaces A to D (0319 to 0322) have different capacitances. The small circuit A including the ground potential point, the ground A (0311), the capacitance space A (0319), the virtual coil A (0323), and the like is obtained from the coils (0308) and the detection unit (0327). A current is generated separately from the circuit. This is because the ground B (0312) which is the ground potential point, the small space B composed of the electrostatic capacity space B (0320) and the virtual coil B (0324), and the ground C (0313) which is the ground potential point are static. A small circuit C composed of a capacitance space C (0321) and a virtual coil C (0325), a ground D (0314), a capacitance space D (0322), a virtual coil D (0326) and the like as ground potential points The same applies to the small circuit D consisting of: Therefore, the potential difference generated between the ground, which is each ground potential point, and each virtual coil varies, and the value of the potential difference always changes independently. The change is perceived as noise by the coils (0308). This is a cause of noise that is separately received when the composite coil unit receives the magnetic field component of the electromagnetic wave.

  Here, in FIG.3 (c), like the antenna apparatus concerning this embodiment, each coil (0331) is covered with a sheath part (0332), and from the dielectric breakdown part (0333) of a power transmission line (0328-0330). A state in the case of receiving an electromagnetic wave (0334) derived from a partial discharge is shown. As illustrated in FIG. 3C, the sheath portion (0332) is connected to the ground shield side (0336) of the cable with the ground shield that connects each coil (0331) and the detection portion (0335). preferable. When this state is represented as a circuit diagram, it is as shown in the circuit diagram of FIG. Since the sheath portion (0339) is provided between the ground (0337) that is the ground potential point and each coil (0338) of the composite coil portion, the capacitance space is connected to the ground (0337) that is the ground potential point. It will occur between the sheath (0339). Therefore, the capacitance space (0340) is formed between the ground (0337) and the sheath (0339), which are ground potential points. Therefore, each coil (0338) is hardly affected by the potential difference caused by the existence of the capacitance space (0340). As a result, the antenna device according to the present embodiment can hardly detect the noise. The sheath (0332) does not necessarily have to be grounded by connecting to the ground shield side (0336) of the cable with ground shield. By separately providing a ground potential point and connecting the sheath portion (0332) and the ground potential point, the sheath portion (0332) can be grounded.

  Here, an enlarged view of a portion where the coil wire of each coil of the composite coil portion, the cable with the ground shield, and the sheath portion are connected within a square dotted line frame (0214) in FIG. In addition, in the said frame (0214), it describes about the case where a coaxial cable (0215) is used for the cable with a ground shield as an example. First, one end (0216) of the coil wire end is connected to the inner conductor (0217) of the coaxial cable. The other end (0218) of the coil wire is connected to the outer conductor (0219) of the coaxial cable. Then, the sheath (0220) is connected to the outer conductor (0219). The above is an example of a method for connecting each coil of the composite coil portion, the cable with the ground shield, and the sheath portion. According to the connection method, the sheath (0332) can be grounded through the detection unit (0335). The sheath (0220) may be connected to the inner conductor (0217) instead of being connected to the outer conductor (0219). In that case, the sign of the electromotive force detected by the detection unit is reversed. Therefore, when the electromotive force is converted into a signal, processing for reversing the positive / negative is necessary.

As described above, the sheath is made of a nonmagnetic conductor material. Therefore, it is preferable to use a pipe made of copper, aluminum, or conductive plastic for the sheath. Moreover, about the thickness of the said pipe, even if it is a case where each coil of a composite coil part is comprised from what wound the coil wire in multiple times, the thickness which can cover each said coil is required Become. The loop diameter of each coil needs to be ¼π of the wavelength of the received electromagnetic wave or an integer multiple thereof. Therefore, the diameter of the opening surface of the pipe also needs to be a length that matches the loop diameter of each coil. In addition, it is also possible to comprise a sheath part with Cu tape. In that case, the surface of the coil wire of each coil is wound with the Cu tape without a gap, except for the connection portion between each coil wire and the cable with ground shield.
<Effect of Embodiment 1>

The antenna device of this embodiment can cancel a potential difference generated between the ground, which is a ground potential point, and the composite coil unit. Therefore, it is possible to reduce noise generated by the composite coil unit receiving the potential difference. Therefore, an antenna device capable of specifying the position of the electromagnetic wave generation source with higher accuracy is realized.
<< Embodiment 2 >>
<Outline of Embodiment 2>

The antenna device according to the present embodiment is basically the same as the antenna device according to the first embodiment. However, the antenna device according to the present embodiment is different from the antenna device according to the first embodiment in having a capacitor for impedance matching between the composite coil portion and the cable with the ground shield.
<Functional configuration of Embodiment 2>

  FIG. 4 is a functional block diagram of the antenna device according to the present embodiment. The mechanical configuration of the antenna device (0401) according to the present embodiment is basically the same as the functional configuration of the antenna device according to the first embodiment. However, the antenna device (0401) according to the present embodiment further includes a first matching capacitor (0402).

  (Description of First Matching Capacitor) The first matching capacitor (0402) is provided for impedance matching between the composite coil portion and the cable with the ground shield. And this 1st matching capacitor | condenser (0402) is arrange | positioned between the coil wire of the other end side of a sheath part, and the axis line of a cable with a ground shield.

  Here, FIG. 5 shows a diagram for explaining the first matching capacitor in the present embodiment. First, FIG. 5A illustrates how to connect each coil of the composite coil portion, the cable with the ground shield, the sheath portion, and the first matching capacitor. However, in FIG. 5A, as an example, a case where a coaxial cable (0501) is used as a ground shielded cable will be described. As illustrated in FIG. 5A, the first matching capacitor (0502) is connected in series between the inner conductor (0518) of the coaxial cable and one end (0503) of the coil wire end of each coil. It is preferable to do this. The other end (0504) of the coil wire end of each coil is connected to the outer conductor (0505) of the coaxial cable. Then, the sheath (0506) is connected to the outer conductor (0505). The above is an example of a method of connecting each coil of the composite coil portion, the cable with the ground shield, the sheath portion, and the first matching capacitor.

  Next, what is meant by “impedance matching between the composite coil section and the ground shielded cable” will be described below. First, FIG. 5B shows a circuit formed by the ground shielded cable, the first matching capacitor, each coil of the composite coil portion, and the sheath portion by the connection. The ground shielded cable (0507), the first matching capacitor (0508), and each coil (0509) of the composite coil portion are connected in series to form one circuit. A sheath (0516) is connected in parallel to the negative pole side of each coil (0509) so as to be along each coil (0509).

  Here, the part (0519) which consists of each coil (0509) and sheath part (0516) of a composite coil part can be handled as a distributed constant circuit, and is expressed more strictly like FIG.5 (c). As shown in FIG. 5 (c), each coil (0509) includes a virtual series coil (0510) and a virtual series resistance (0511) connected in series on a coil wire, a sheath (0512), a coil A plurality of small circuits (0515) each including a virtual parallel capacitance space (0513) and a virtual parallel resistance (0514) formed by electrostatic induction between the wire and the sheath (0512). It can be expressed by arranging them in series. Incidentally, the virtual parallel resistance (0514) is caused by leakage resistance generated between the coil wire and the sheath (0512).

Here, the value of the inductance _{L i} virtual serial coil (0510), the resistance value _{R i} of the virtual series resistance (0511), the value _{C i} of the charge capacity of the virtual parallel capacitance space (0513) The resistance value of the virtual parallel resistance (0514) is G _i . The value of the L _i is the same as the inductance values of the coils. That is, the value of the L _i is the proportional opening surface area of each coil and is proportional the to the square of the number of turns of each coil. The value of the R _i are the a resistance value per unit length of the coil wire of each coil. That is, the value of R _i depends on the resistance value of the coil wire of each coil. Therefore, the value of R _i depends on the material of the coil wire of each coil. The value of the C _i, the distance of the coil wire and the sheath portion (0512), and, depending on the radius of the sheath portion of the coil wire (0512). Therefore, the value of the C _i is dependent like the inner diameter of the turns and the sheath portion of the coil wire (0512). The value of G _i depends on the dielectric constant of the material that insulates the coil wire from the sheath (0512). Therefore, the value of the G _i will depends on the material of the sheath of the coil wire.

この式１は、式２のように簡略化することが可能である。
〔式２〕

ここで、前記Ｒ_ｒの値は前記Ｌ_ｉ、および、前記Ｒ_ｉ、および、前記Ｃ_ｉ、および、前記Ｇ_ｉの各値に依存する。以上から、接地シールド付ケーブル（０５０７）と、前記各コイル（０５０９）と、第一整合コンデンサ（０５０８）と、鞘部（０５１６）と、からなる回路の合成インピーダンスＺ_ｔｏｔは、Ｚ_Ｔ＋Ｒ_ｒ＋ｊ（ωＬ_ｉ−（１／ωＣ））で表わされる。 Next, consider the combined impedance Z _tot of the circuit formed by the cable with the ground shield, the first matching capacitor, each coil of the composite coil portion, and the sheath portion. First, let Z _{T be} the characteristic impedance of the cable with ground shield (0507). The value of the Z _T is a value unique to each type of cable with an earth shield. For example, the value of the characteristic impedance of the coaxial cable is 50Ω or 75Ω. Therefore, when using a coaxial cable to the cable with an earth shield, the value of the Z _T is 50Ω or 75 ohms. Therefore, the value of the Z _T is, since a value will be uniformly determined at the time of determining the type of cable with an earth shield can be regarded as constant. The impedance of the first matching capacitor (0508) is 1 / jωC. Incidentally, if a variable capacitance capacitor is used for the first matching capacitor (0508), the value of 1 / jωC can be adjusted within the performance range. Strictly speaking, the value of the impedance of each coil of the composite coil portion is expressed by Equation 1.
[Formula 1]

Equation 1 can be simplified as Equation 2.
[Formula 2]

Here, the value of R _r depends on the values of L _i , R _i , C _i , and G _i . From the above, the combined impedance Z _{tot of the} circuit including the ground shielded cable (0507), the coils (0509), the first matching capacitor (0508), and the sheath (0516) is Z _T + R _r + J (ωL _i − (1 / ωC)).

ここで、Ｉは接地シールド付ケーブル（０５０７）と、前記各コイル（０５０９）と、第一整合コンデンサ（０５０８）と、からなる回路を流れる電流の実効値を表す。前記Ｉは式４にて表わされる。
〔式４〕

ここで、Ｅは検知部（０５１７）が前記回路へと印加する電圧の値である。この値はアンテナ装置のユーザにより一律に決められてしまう値であるので、式４においては定数とみなす。まず、Ｐを最大にするためには、式３が満たされる必要がある。
〔式５〕

式５を満たすときの平均電力Ｐは、式６にて表わされる。
〔式６〕

この式６において、平均電力Ｐが最大値になるためには、前記Ｚ_Ｔと前記Ｒ_ｒとは式７に示す条件を満たす必要がある。
〔式７〕

以上から、アンテナ装置の受信感度を最善にするには、図５（ｂ）に示すように第一整合コンデンサ（０５０８）を設け、かつ、式５および式７を満たすよう前記各値を調整すればよいことがわかる。まず、式７を満たすためには、前記各コイルの開口面面積や、前記各コイルの巻数、前記各コイルのコイル線の材質、前記鞘部（０５１２）の内径、前記コイル線のシースの材質などをうまく調整する。そして、式５を満たすにはωＬ_ｉ＝（１／ωＣ）となるよう、前記各コイルの開口面面積と前記各コイルの巻数、および、第一整合コンデンサの電荷容量を調整する。以上が、「接地シールド付ケーブルとのインピーダンス整合をとる」方法の一例についての説明である。また、上記方法例のように、アンテナ装置の受信感度を最善にするために、複合コイル部と接地シールド付ケーブルとのインピーダンス値を調節することが、本実施形態における「インピーダンス整合」に相当する。また、以上から、第一整合コンデンサは、アンテナ装置の受信感度を最善にするために必要な構成要件であるといえる。
<実施形態２の効果> In order to optimize the reception sensitivity of the antenna device, it is necessary to maximize the power consumption of each coil (0509), which is the receiving portion of the magnetic field component of the electromagnetic wave of the antenna device. For this purpose, it is necessary to maximize the average power P supplied to each coil (0509). First, the average power P is expressed by Equation 3.
[Formula 3]

Here, I represents the effective value of the current flowing through the circuit including the cable with ground shield (0507), the coils (0509), and the first matching capacitor (0508). Said I is represented by Formula 4.
[Formula 4]

Here, E is a value of a voltage applied to the circuit by the detection unit (0517). Since this value is a value that is uniformly determined by the user of the antenna device, it is regarded as a constant in Equation 4. First, in order to maximize P, Equation 3 needs to be satisfied.
[Formula 5]

The average power P when Expression 5 is satisfied is expressed by Expression 6.
[Formula 6]

In Equation 6, in order for the average power P to be the maximum value, Z _T and R _r must satisfy the condition shown in Equation 7.
[Formula 7]

From the above, in order to optimize the reception sensitivity of the antenna device, the first matching capacitor (0508) is provided as shown in FIG. 5B, and the above values are adjusted so as to satisfy Equations 5 and 7. I understand that First, in order to satisfy Expression 7, the opening surface area of each coil, the number of turns of each coil, the coil wire material of each coil, the inner diameter of the sheath (0512), the sheath material of the coil wire Adjust well. Then, to satisfy Equation 5, the opening surface area of each coil, the number of turns of each coil, and the charge capacity of the first matching capacitor are adjusted so that ωL _i = (1 / ωC). The above is an explanation of an example of a method of “taking impedance matching with a cable with a ground shield”. Further, as in the above method example, adjusting the impedance value between the composite coil portion and the cable with the ground shield in order to optimize the reception sensitivity of the antenna device corresponds to “impedance matching” in the present embodiment. . In addition, from the above, it can be said that the first matching capacitor is a necessary component for making the receiving sensitivity of the antenna device the best.
<Effect of Embodiment 2>

According to the present embodiment, an antenna device with higher reception sensitivity is realized.
<< Embodiment 3 >>
<Outline of Embodiment 3>

The antenna device according to the present embodiment is basically the same as the antenna device according to the second embodiment. However, the antenna device according to this embodiment further includes an antenna according to the first and second embodiments in that a capacitor is provided between the coil wire on one end side of the sheath portion and the coil wire on the other end side of the sheath portion. Different from the device.
<Functional configuration of Embodiment 3>

  FIG. 6 is a functional block diagram of the antenna device according to the present embodiment. The mechanical configuration of the antenna device (0601) according to the present embodiment is basically the same as the functional configuration of the antenna device according to the second embodiment. However, the antenna device (0601) according to the present embodiment further includes a second matching capacitor (0602).

  (Description of Second Matching Capacitor) The second matching capacitor (0602) is disposed between the coil wire on one end side of the sheath portion and the coil wire on the other end side of the sheath portion for impedance matching. The

  The second matching capacitor (0602) is preferably a variable capacitance capacitor. Similarly, it is preferable to use a variable capacitance capacitor for the first matching capacitor according to the present embodiment.

  Here, FIG. 7 shows a diagram for explaining the second matching capacitor in the present embodiment. First, FIG. 7A shows a coil wire (0704) of each coil of the composite coil portion, a cable with a ground shield, a sheath portion (0705, 0706), a first matching capacitor (0707), and a second matching. This is an example of how to connect the capacitor (0702). However, in FIG. 7A, the case where a coaxial cable (0701) is used as the ground shielded cable is described as an example. As illustrated in FIG. 7A, the second matching capacitor (0702) includes a side of the coil wire that is directly connected to the first matching capacitor, and an outer conductor of the coaxial cable ( 0708) and the directly connected side. The above is an example of a method of arranging the second matching capacitor (0702).

  Next, FIG. 7B shows a circuit formed by the ground shielded cable, the first matching capacitor, the second matching capacitor, each coil of the composite coil portion, and the sheath portion by the connection. As shown in FIG. 7B, if the first matching capacitor (0709) and the second matching capacitor (0710) are connected in series with the coil wire (0711) to form a series resonance circuit (0712), The opening area of the coil wire can be reduced. As a result, the composite coil portion can be reduced in size.

Note that the antenna device according to the present embodiment may have a configuration in which the first matching capacitor is not provided and only the second matching capacitor is provided. In this case, the second matching capacitor has a function of adjusting the impedance of the composite coil portion of the antenna device. Therefore, in this case, like the first matching capacitor in the second embodiment, the second matching capacitor can achieve impedance matching between the composite coil portion of the antenna device and the ground shielded cable.
<Effect of Embodiment 3>

According to this embodiment, a smaller antenna device is realized.
<< Embodiment 4 >>
<Outline of Embodiment 4>

The antenna device according to the present embodiment is basically the same as the antenna device according to the first to third embodiments. However, the antenna device according to the present embodiment is further different from the antenna devices according to the first to third embodiments in that the position of the generation source of the electromagnetic wave to be detected can be automatically determined.
<Functional Configuration of Embodiment 4>

  FIG. 8 is a functional block diagram of the antenna device according to the present embodiment. The mechanical configuration of the antenna device (0801) according to the present embodiment is basically the same as the functional configuration of the antenna device according to the third embodiment. However, the antenna device (0801) according to the present embodiment further includes a first azimuth calculation unit (0802).

  (Description of the First Direction Calculation Unit) The first direction calculation unit (0802) calculates the direction of the electromagnetic wave generation source according to the electromotive force of each coil detected by the detection unit.

  A method of “calculating the direction of the electromagnetic wave generation source according to the electromotive force of each coil detected by the detection unit” will be described. As described in the first embodiment, the electromotive force generated in each coil constituting the composite coil portion differs depending on the relative positional relationship between the electromagnetic wave generation position and the composite coil portion. First, consider how much magnetic field component of electromagnetic waves each coil of the composite coil portion receives. FIG. 9 is a diagram illustrating a method of calculating how much magnetic field component of electromagnetic waves each coil of the composite coil unit receives. In an arbitrary xyz space, the coil A (0901) in which the axial direction faces the x-axis direction, the coil B (0902) in which the axial direction faces the y-axis direction, and the coil whose axial direction faces the z-axis direction Assume C (0903). Note that the center of the coil A (0901), the center of the coil B (0902), and the center of the coil C (0903) coincide at the intersection of the x axis, the y axis, and the z axis. Here, it is assumed that an electromagnetic wave (0904) having a magnetic field component intensity I passes through the intersection of the x-axis, the y-axis, and the z-axis. The intensity of the magnetic field component (0904) of the electromagnetic wave is I, and the direction of the magnetic field component (0904) of the electromagnetic wave is an angle θ with respect to the xz plane and an angle φ with respect to the xy plane. The strength of the magnetic field component of the electromagnetic wave sensed by each coil (0901-0903) is represented by the amount of projection of the strength I of the magnetic field component (0904) of the electromagnetic wave with respect to each coil axis direction. In the case of the coil A (0901), the axial direction of the coil A (0901) is the x-axis direction. Therefore, the intensity of the magnetic field component of the electromagnetic wave from the outside of the coil sensed by the coil A (0901) is the intensity I of the magnetic field component (0904) of the electromagnetic wave. Icos φ cos θ (0905), which is the projection amount with respect to the x-axis direction. Similarly, in the case of the coil B (0902), since its own axial direction is the y-axis direction, the intensity of the magnetic field component of the electromagnetic wave from the outside of the coil sensed by the coil B (0902) is the electromagnetic field component (0904). I cos φ sin θ (0906), which is the projection amount of the intensity I of the intensity I with respect to the y-axis direction. Similarly, in the case of the coil C (0903), the axial direction of the coil C (0903) is the z-axis direction. Therefore, the strength of the magnetic field component of the electromagnetic wave from the outside of the coil sensed by the coil C (0903) is the magnetic field component of the electromagnetic wave (0904). Isinφ (0907), which is the projection amount of the intensity I of the intensity I with respect to the z-axis direction.

  Next, it is considered how much electromotive force is generated by each coil when receiving the magnetic field component of the electromagnetic wave. The magnitude of the electromotive force generated by each coil is proportional to the strength of the magnetic field component of the electromagnetic wave from the outside of the coil sensed by each coil. Therefore, the magnitudes of the electromotive forces generated by the coil A (0901), the coil B (0902), and the coil C (0903) are proportional to Icosφcosθ, Icosφsinθ, and Isinφ, respectively.

ここで、ｋは比例定数である。前記式８から、角度φ、θが求まる。そして、前記ｘｙｚ空間中の前記電磁波の磁界成分の向きがわかる。以上が、「検知部にて検知した各コイルの起電力に応じて電磁波発生源の方位を計算する」方法である。 Next, the angles φ and θ are obtained from the value of the detected electromotive force. A detection part detects the electromotive force which arose in each coil (0901-0903) independently for every coil. Among the electromotive force detecting unit detects a value of the electromotive force coil A (0901) has occurred and was E _A. Similarly, the value of the electromotive force generated by the coil B (0902) is E _B , and the value of the electromotive force generated by the coil C (0903) is E _C. From the description so far, it can be said that there is a relationship represented by Equation 8 between the magnitude of the electromotive force generated by each coil, the direction of the magnetic field component of the electromagnetic wave, and the strength of the magnetic field component of the electromagnetic wave.
[Formula 8]

Here, k is a proportionality constant. From the formula 8, the angles φ and θ can be obtained. And the direction of the magnetic field component of the electromagnetic wave in the xyz space is known. The above is the method of “calculating the direction of the electromagnetic wave generation source according to the electromotive force of each coil detected by the detection unit”.

The first azimuth calculation unit is preferably configured by an arithmetic processing device such as a general-purpose personal computer as an example. In that case, an A / D board or the like needs to be used for the detection unit. The detection unit and the first orientation calculation unit are preferably connected using a USB cable or the like.
<Specific Example of Embodiment 4>

  FIG. 10 shows, as one specific example of the present embodiment, when the antenna device according to the present embodiment is used to specify the position where the partial discharge generated in the transformer (1001) in the substation is specified. The state of is shown.

  First, a configuration example of the antenna device according to this specific embodiment will be described with reference to FIG.

  In this specific embodiment, the composite coil portion (1004) is made of a coil wire A inserted into a circular copper pipe A (1005), a coil wire B inserted into a circular copper pipe B (1006), and a circular copper product. The coil C is inserted into the pipe C (1007) (the coil wires A to C are not described in detail in FIG. 10). And about the said coil wires AC, the cable etc. which are used for the loop antenna for radio wave reception are used. And a sheath part is comprised from the said circular copper pipe A (1005), the circular copper pipe B (1006), and the circular copper pipe C (1007). Further, the circular copper pipes A to C are fixed by fasteners (1012 to 1017) so that the centers of the coil wires A to C coincide with each other and the axes of the coil wires A to C are orthogonal to each other.

  The detection unit is composed of an A / D board A (1008). And about a cable with a ground shield, a general purpose coaxial cable (1009-1011) is used. Here, one end of each of the coil wires A to C, that is, the end P of the coil wires A to C, is connected to the inner conductor of each coaxial cable. The other end of each of the coil wires A to C, that is, the end Q of the coil wires A to C is connected to the outer conductor of the coaxial cable. Each of the circular copper pipes (1005 to 1007) is connected to the outer conductor of each of the coaxial cables by a conductive wire.

  The first azimuth calculation unit is composed of a general-purpose personal computer (1018). A monitor (1019) is also provided for displaying the calculation result of the direction of the electromagnetic wave generation source. The A / D board (1008) and the personal computer (1018) are connected using a general-purpose USB cable (1021).

  In this specific embodiment, an A / D board B (1020) is provided to refer to the period of change in the voltage of the current flowing through the transformer (1001). Then, the electric wire in the transformer (1001) and the A / D board B (1020) are connected by a coaxial cable or the like. Then, the personal computer (1018) and the A / D board B (1020) are connected using a general-purpose USB cable. In the following, the current flowing from the transformer (1001) to the A / D board B (1020) will be referred to as a reference current.

  Next, the flow of specifying the position of the partial discharge generation source in this specific embodiment will be described.

  First, dielectric breakdown occurs in the transformer (1001) in the substation, and an electromagnetic wave derived from partial discharge, that is, a partial discharge electromagnetic wave (1003) is generated from the dielectric breakdown point (1002). Each of the coil wires A to C receives the partial discharge electromagnetic wave. Due to the reception, the coil wires A to C each generate an electromotive force. Each electromotive force is transmitted to the A / D board A (1008) via the coaxial cables (1009 to 1011). Here, each electromotive force is signal-processed by the A / D board A (1008) and converted into an electromotive force signal. The electromotive force signal is transmitted to the personal computer (1018) via the USB cable (1021).

  Further, a reference current always flows from the transformer (1001) to the A / D board B (1020). The A / D board B (1020) continues to convert the reference current into a reference signal. The A / D board B (1020) continues to transmit the reference signal to the personal computer (1018).

  Here, a hardware configuration when the first azimuth calculation unit is configured by a general-purpose personal computer (1018) will be described with reference to FIG. The personal computer (1018) mainly includes a CPU (1101), an HDD (1102), a main memory (1103), an I / O (1104), and a monitor (1105).

  A first azimuth calculation program (1106) is developed in the work area of the main memory (1103). The first azimuth calculation program (1106) is used to calculate the position of the partial discharge generation source based on the electromotive force signal and display the calculation result on the monitor (1105).

  First, the personal computer (1018) takes in the electromotive force signal (1107) and the reference signal (1108) via the I / O (1104).

  Next, based on the electromotive force signal (1107) and the reference signal (1108), the CPU (1101) first converts the electromotive force generated in the composite coil portion into the partial discharge electromagnetic wave according to the first azimuth calculation program (1106). It is distinguished whether it is derived from. FIG. 12 illustrates a diagram for explaining a state in which a component derived from the partial discharge electromagnetic wave is extracted from the electromotive force generated in the composite coil portion. Here, FIG. 12A is a diagram for explaining how the CPU (1101) compares the intensities of the electromotive force signal and the reference signal for each detection time in accordance with the first azimuth calculation program (1106). . FIG. 12B illustrates how the CPU (1101) extracts a component derived from the partial discharge electromagnetic wave from the electromotive force signal subjected to the comparison process according to the first azimuth calculation program (1106). FIG. 12A and 12B, the reference signal (1204, 1220) and the electromotive force signal which indicate the magnitude of the electromotive force generated in the coil wire A (1201, 1208), electromotive force Among the power signals, those indicating the magnitude of the electromotive force generated in the coil wire B (1202, 1209), and those indicating the magnitude of the electromotive force generated in the coil wire C among the electromotive force signals (1203, 1210). The vertical axis represents signal intensity, and the horizontal axis represents detection time. First, as shown in FIG. 12A, the CPU (1101) compares the electromotive force signals (1201 to 1203) with the reference signal (1204). Then, it is determined whether or not the peaks (1205 to 1207) generated in the electromotive force signals (1201 to 1203) have the same cycle as the reference signal (1204).

  Next, as shown in FIG. 12B, the CPU (1101) extracts the peaks (1205 to 1207) from the electromotive force signals according to the first azimuth calculation program (1106) (1208 to 1210). ).

  Next, the CPU (1101) calculates the intensity of the magnetic field component of the partial discharge electromagnetic wave received by each of the coil wires A to C according to the first azimuth calculation program (1106). More specifically, for example, the strength of the magnetic field component of the partial discharge electromagnetic wave received by the coil wire A, that is, the magnetic field strength A is obtained by obtaining an average value of the peaks (1211-1213) derived from the coil wire A. .

Next, the CPU (1101) calculates the position of the partial discharge generation source according to the first azimuth calculation program (1106). The calculation is performed by an arithmetic process based on Equation 8. First, the E _A of formula 8 field strength A, the magnetic field strength B in E _B, the processing corresponding to substituting the magnetic field intensity C to E _C. Then, processing equivalent to calculating the angles φ and θ from the four equations shown in Equation 8 is performed. Then, an azimuth calculation result (1109) including information on the magnetic field strength A, the magnetic field strength B, the magnetic field strength C, and the angles φ and θ is generated and stored in the data area of the main memory.

  Then, the CPU (1101) displays the azimuth calculation result (1109) on the monitor (1105) according to the first azimuth calculation program (1106). FIG. 13 is an example of the azimuth calculation result (1109) displayed on the monitor (1105). As shown in FIG. 13, the magnetic field intensity A (1301), magnetic field intensity B (1302), magnetic field intensity C (1303), angles φ, θ (1304), and the like are displayed on the monitor.

  FIG. 14 shows a processing flow of the first azimuth calculation unit in this specific embodiment. First, the first direction calculation unit determines whether an electromotive force signal derived from the coil wires A to C is obtained from the detection unit (S1401). Here, when it is not determined that the first azimuth calculation unit has obtained the electromotive force signal, the first azimuth calculation unit again determines whether or not the electromotive force signal derived from the coil wires A to C has been obtained from the detection unit. . If it is determined that the first azimuth calculation unit has obtained the electromotive force signal, it is then determined whether the cycle of the reference signal and the peak generated in the electromotive force signal are the same (S1402). Here, when the first azimuth calculation unit does not determine that the period of the peak generated in the reference signal and the electromotive force signal is the same, the first azimuth calculation unit again transmits the coil wires A to A from the detection unit. It is determined whether or not an electromotive force signal derived from C has been obtained. If the first azimuth calculation unit determines that the periods of the reference signal and the peak generated in the electromotive force signal are the same, then all the peaks are extracted from the electromotive force signal (S1403). Next, the first azimuth calculation unit calculates the strength of the magnetic field component of the partial discharge electromagnetic wave received by each of the coil wires A to C (S1404). Next, the first orientation calculation unit calculates the angles φ and θ and displays them on the monitor (S1405). The above is the processing flow of the first azimuth calculation unit in this specific embodiment.

  Finally, a case where the first matching capacitor and the second matching capacitor are provided in this specific embodiment will be additionally described. The first matching capacitors are connected between the end portions P of the coil wires A to C and the inner conductors of the respective coaxial cables. The second matching capacitor is connected between the end portion P of the coil wires A to C and the end portion Q of the coil wires A to C. The first matching capacitor and the second matching capacitor are preferably constituted by an air variable condenser. About the said air variable condenser, it has a rotating shaft as an example, and the type which rotates the electrode plate incorporated in itself by rotating the said rotating shaft is used. In addition, the rotation of the rotating shaft can be performed electrically, for example. Further, as an example, the timing of adjusting the charge capacities of the first matching capacitor and the second matching capacitor is preferably performed before the first azimuth calculation unit performs the process of specifying the partial discharge occurrence position. In that case, first, before the processing, an oscilloscope prepared separately is connected to the coaxial cable (1009 to 1011). Then, the electromotive force generated by the coil wires A to C is displayed on the display screen of the oscilloscope. Then, the user adjusts the charge capacities of the first matching capacitor and the second matching capacitor by turning the rotating shaft while watching the display of the electromotive force. In this manner, impedance matching between the coil wires A to C and the coaxial cable can be performed.

The above is a description of a specific example of the antenna device according to the present embodiment.
<Effect of Embodiment 4>

According to the present embodiment, an antenna device that can automatically obtain the position of an electromagnetic wave generation source is realized.
<< Embodiment 5 >>
<Outline of Embodiment 5>

The antenna device according to the present embodiment is basically the same as the antenna device according to the first to fourth embodiments. However, the antenna device according to the present embodiment is further different from the antenna devices according to the first to fourth embodiments in that the direction of the composite coil portion can be controlled.
<Functional Configuration of Embodiment 5>

  FIG. 15 is a functional block diagram of the antenna device according to the present embodiment. The mechanical configuration of the antenna device (1501) according to the present embodiment is basically the same as the functional configuration of the antenna device according to the fourth embodiment. However, the antenna device (1501) according to the present embodiment further includes a drive unit (1502), a drive control unit (1503), and a second orientation calculation unit (1504). An example of the mechanism of the antenna device according to this embodiment is shown in FIG.

  (Description of Drive Unit) The drive unit (1502) can drive the composite coil unit so as to change the direction of the coil in a combined state. In the antenna device illustrated in FIG. 16, the drive unit is a coil fixture for fixing the parts including the composite coil part, the sheath part, and the first and second matching capacitors, that is, receiving parts A to C (1601 to 1603). A to C (1604 to 1606), a motor A (1607) for rotating the receiving portions A to C (1601 to 1603), and a motor C (1609) for rotating the coil fixture A (1604) And a motor B (1608) for rotating the coil fixture C (1606). Moreover, you may have a square handle (1610) and a handle (1611) for making these components portable. In addition, for the convenience of receiving the magnetic field component of the electromagnetic wave to be detected, basically, in the initial state of the antenna device, the receiving portions A to C (1601 to 1603) are respectively coil fixing tools A to C (1604). ˜1606) are arranged on the same plane as any one of them. In the present embodiment, for convenience, the coil wire included in the reception portion A (1601) is the coil wire A, the coil wire included in the reception portion B (1602) is the coil wire B, and the reception portion C (1603). ) Is referred to as a coil wire C.

  Here, how the drive unit (1502) drives the composite coil unit will be described with reference to FIGS. 16 and 17. FIG. FIG. 17 is a diagram for explaining the mechanical relationship among the receiving portion, the coil fixture A, the coil fixture C, and the motor A shown in FIG. First, how the motor A (1701) rotates the receiving portion (1702) will be described. As shown in FIG. 17A, the coil fixture A (1703) is divided into an upper layer (1704) and a lower layer (1705). The upper layer (1704) of the coil fixture A meshes with the screw structure of the inner wall of the coil fixture A lower layer (1705) by the screw structure provided in the meshing portion with the coil fixture A lower layer (1705). It can rotate on the coil fixture A lower layer (1705) without resistance. The screw length of the screw structure provided at the meshing portion of the coil fixture A upper layer (1704) with the coil fixture A lower layer (1705) and the screw structure of the inner wall of the coil fixture A lower layer (1705) are as follows. When the two screw structures are actually engaged with each other and rotated, the length is set such that the two screw structures are disengaged when they are rotated 360 degrees just in the power method. In addition, the motor A (1701) is attached to the lower layer (1705) of the coil fixture A by a motor mounting screw (1708) and a mounting bracket (1709). Further, a gear (1706) of the motor A (1701) and a circular gear (1707) for rotating in the circumferential direction of the meshing coil fixture A are installed on the front side surface of the upper layer (1704) of the coil fixture A. Yes. Further, the receiving portion (1702) is attached to the upper layer (1704) of the coil fixture A by means of coil fixing screws (1710, 1711). The coil fixing screws (1710, 1711) are inserted deeply so that the gear (1706) and the circular gear (1707) of the motor A (1701) can be engaged with each other.

  As shown in FIG. 17B, the coil fixture A lower layer (1715) is fixed to the coil fixture C (1718) by fixing rods (1712) and (1713). Therefore, only the upper layer (1717) of the coil fixture A can be rotated by driving the motor A (1716). Thereby, the receiving part (1714) can be rotated on the coil fixture A lower layer (1715) by the motor A (1716).

  In the antenna apparatus shown in FIG. 16, the receiving parts A to C (1601 to 1603), the coil fixture A (1604), the coil fixture C (1606), and the motor A (1607) as described above. The mechanical relationship is also used for the mechanical relationship among the coil fixture A (1604), the coil fixture C (1606), the motor C (1609), and the coil fixture B (1605). Therefore, the coil fixture A (1604) can be rotated in the circumferential direction of the coil fixture C (1606) by the motor C (1609). The mechanical relationship is also used for the mechanical relationship between the coil fixture C (1606), the coil fixture B (1605), the motor B (1608), and the square handle (1610). Therefore, the coil fixture C (1606) can be rotated in the circumferential direction of the coil fixture B (1605) by the motor B (1608).

  The motors A to C (1607 to 1609) are connected to a general-purpose personal computer (1613) via a D / A board (1612). A signal from the personal computer (1613) is received via the D / A board (1612). The motors A to C (1607 to 1609) are driven according to the signals.

  For example, a DC motor may be used for the motors A to C (1607 to 1609) and a pulse signal may be used for the control. Further, stepping motors may be used for the motors A to C (1607 to 1609).

  In addition, the coil fixtures A to C (1604 to 1606), the square handle (1610), and the handle (1611) are preferably made of an insulating material as an example.

  By combining all the mechanical relationships described above, the composite coil portion and the sheath portion can be driven in a three-dimensional direction. This is an example of a method for driving the composite coil section. In addition, about the drive part in this embodiment, if it has a mechanism which can drive not only the said example but a composite coil part and a sheath part in a three-dimensional direction by remote control, it will be a magnetic field of electromagnetic waves in a composite coil part (1501). As long as there is no problem in receiving the component, it can be diverted.

  In addition, a mechanism in which the composite coil part, the drive part, and the sheath part are integrated is possible, such as installing the coil wire of each coil in each coil fastener and replacing each coil fastener with a sheath part. It is.

  (Description of Drive Control Unit) The drive control unit (1503) controls the drive unit so that the electromotive force of a specific coil detected by the detection unit is maximized.

  An example of how to determine a “specific coil” is shown. As described above, the composite coil portion is configured by combining three sets of coils. The three sets of coils have their axes orthogonal to each other. That is, the opening directions of the opening surfaces of the three sets of coils are orthogonal to each other. Therefore, when the three sets of coils receive the magnetic field component of the electromagnetic wave, the magnitudes of the electromotive forces generated by the three sets of coils are different from each other unless rarely occurs. Therefore, when the three sets of coils are receiving the magnetic field component of the electromagnetic wave, one of the three sets of coils has an electromotive force of the same magnitude as the other coils or the other coils. A large electromotive force is generated. The drive control unit recognizes the coil as a monitoring coil. In this way, the drive control unit 1503 first determines which of the three sets of coils is one of the three sets of coils, that is, the monitoring coil. The above is an example of how to determine “a specific coil detected by the detection unit”.

  The first azimuth calculating unit calculates the magnitude of the electromotive force generated by the three sets of coils. The calculation method is performed by the same method as that described in the fourth embodiment.

  This drive control unit can be configured by a general-purpose personal computer (1613) also illustrated in FIG. Also, as illustrated in FIG. 16, when the drive unit is configured by a motor or the like, the motor and the personal computer (1613) are connected via a D / A board (1612). This is an example of a connection method between the drive unit and the drive control unit. The hardware configuration when the drive control unit is configured by an arithmetic processing device such as the personal computer (1613) will be described later.

  (Explanation of the Second Direction Calculation Unit) The second direction calculation unit (1504) calculates the direction of the electromagnetic wave generation source from the direction of the coil when the electromotive force of the specific coil becomes maximum.

  The second azimuth calculation unit can be configured by a general-purpose personal computer (1613) also illustrated in FIG. In this case, the calculation result of the azimuth of the electromagnetic wave generation source can be displayed on the monitor (1614). The hardware configuration when the second azimuth calculation unit is configured by an arithmetic processing device such as the personal computer (1613) will be described below.

  In the mechanism example of the antenna device illustrated in FIG. 16, the detection unit is configured by an A / D board (1616) as in the previous embodiments. The electromotive force generated by the three sets of coils is converted into an electromotive force signal which is a digital signal by the A / D board (1616). Then, the electromotive force signal is transmitted to the personal computer (1613) using a general-purpose USB cable.

  In addition, although not shown, in the example of the antenna device mechanism shown in FIG. 16, in order to determine the periodicity of the electromagnetic wave that is the detection target, for example, the period of the voltage change of the current that flows through the line that is the measurement target in the power generation facility Refer to At that time, a separate A / D board is provided to refer to the period of voltage change. Then, the line and the A / D board are connected by a coaxial cable or the like. Then, the personal computer (1613) and the A / D board are connected using a general-purpose USB cable. The A / D board continues to convert the voltage change into a reference signal. The A / D board continues to transmit the reference signal to the personal computer (1613).

  Here, in the present embodiment, the hardware configuration when the first azimuth calculation unit, the drive control unit, and the second azimuth calculation unit are configured by an arithmetic processing device such as the personal computer (1613). An example and the flow of processing will be described. FIG. 18 shows a case where the first azimuth calculation unit, the drive control unit, and the second azimuth calculation unit are configured by an arithmetic processing device such as the personal computer (1613) in the antenna device of the present embodiment. An example of a hardware configuration is shown. The hardware configuration described here is basically the same as that described in the specific example of the fourth embodiment. However, a drive program (1801), a drive control program (1802), and a second orientation calculation program (1803) are further developed in the work area.

  First, the personal computer (1613) takes in the electromotive force signal (1817) and the reference signal (1818) via the I / O (1811).

  Next, the function of the first azimuth calculation program (1804) in this embodiment and the flow of arithmetic processing performed according to the first azimuth calculation program (1804), that is, the first arithmetic processing will be described. In the present embodiment, the first azimuth calculation program (1804) is used to calculate the strength of the magnetic field component of the electromagnetic waves detected by the coil wires A to C, respectively. That is, it can be said that the arithmetic processing performed by the CPU (1806) based on the first azimuth calculation program (1804) bears the function of the first azimuth calculation unit.

  Based on the electromotive force signal (1817) and the reference signal (1818), the CPU (1806) first detects the magnetic field of the electromagnetic wave whose detection target is the electromotive force generated in the composite coil section according to the first azimuth calculation program (1804). It is distinguished whether the component is derived from the magnetic field component of the target electromagnetic wave. The figure for demonstrating a mode that the component derived from the magnetic field component of object electromagnetic waves is extracted from the electromotive force which arose in the composite coil part is illustrated using FIG. 12 again. Here, FIG. 12A is a diagram for explaining how the CPU (1806) compares the intensities of the electromotive force signal and the reference signal for each detection time in accordance with the first azimuth calculation program (1804). . FIG. 12B illustrates how the CPU (1806) extracts a component derived from the magnetic field component of the target electromagnetic wave from the electromotive force signal subjected to the comparison process according to the first azimuth calculation program (1804). It is a figure for doing. 12 (a) and 12 (b), reference signals (1204, 1220), and electromotive force signals indicating the magnitude of the electromotive force generated in the coil wire A (1201, 1208), Among the electromotive force signals, those indicating the magnitude of the electromotive force generated in the coil wire B (1202, 1209), and among the electromotive force signals, those indicating the magnitude of the electromotive force generated in the coil wire C (1203, 1210) ), The signal intensity on the vertical axis and the detection time on the horizontal axis. First, as shown in FIG. 12A, the CPU (1806) compares the electromotive force signals (1201 to 1203) with the reference signal (1204). Then, it is determined whether or not the peaks (1205 to 1207) generated in the electromotive force signals (1201 to 1203) have the same period as the reference signal (1204).

  Next, as illustrated in FIG. 12B, the CPU (1806) extracts the peaks (1205 to 1207) from the electromotive force signals according to the first azimuth calculation program (1804) (1208 to 1210). ).

  Next, the CPU (1806) calculates the strength of the magnetic field component of the target electromagnetic wave received by each of the coil wires A to C according to the first azimuth calculation program (1804). More specifically, for example, the strength of the magnetic field component of the target electromagnetic wave received by the coil wire A, that is, the magnetic field strength A is obtained by obtaining an average value of the peaks (1211-1213) derived from the coil wire A. Then, an azimuth calculation result (1807) including the magnetic field strength A, the magnetic field strength B, and the magnetic field strength C is generated and stored in the data area of the main memory. The above is the first calculation process.

  Next, a calculation process for controlling the monitoring coil so as to receive the intensity of the magnetic field component of the maximum electromagnetic wave, that is, a second calculation process and a program used for the second calculation process will be described.

  The drive program (1801) is a program for determining which of the three sets of coils is a monitoring coil and generating a drive signal for driving the motors A to C of the drive unit. The drive control program (1802) is a program for controlling the monitoring coil so as to receive the intensity of the magnetic field component of the maximum electromagnetic wave. The second orientation calculation program (1803) is a program for calculating the orientation of the electromagnetic wave generation source from the orientation of the monitoring coil. That is, it can be said that the arithmetic processing performed by the CPU (1806) based on the drive program (1801) and the drive control program (1802) bears the function of the drive control unit. And it can be said that the arithmetic processing performed by the CPU (1806) based on the second azimuth calculation program (1803) bears the function of the second azimuth calculation unit. Hereinafter, a state in which the CPU (1806) performs arithmetic processing in accordance with these four programs is shown.

  As an initial process in the second calculation process, the CPU (1806) first compares each of the magnetic field strengths A to C included in the azimuth calculation result (1807) in accordance with the drive program (1801). The monitoring coil is determined and stored as monitoring coil information (1808) in the data area of the main memory (1809). The above is the initial process in the second calculation process.

  Next, the CPU (1806) generates a drive signal A (1810) which is a signal for driving the monitoring coil in the circumferential direction of the coil fixture A (1604) based on the monitoring coil information (1808). Then, it is transmitted to the motor A (1607) via the I / O (1811) and the D / A board (1612). Upon receiving this drive signal A (1810), the motor A (1607) is driven. The three sets of coils are also driven in the circumferential direction of the coil fixture A (1604) accordingly.

  While the three sets of coils are driven in the circumferential direction of the coil fixture A (1604), the CPU (1806) uses the electromotive force generated by the three sets of coils as an electromotive force signal via the I / O (1811). Acquire and continue overwriting the azimuth calculation result (1807) in accordance with the first azimuth calculation program (1804). At the same time, in accordance with the drive control program (1802), the CPU (1806) extracts only the component representing the magnitude of the electromotive force generated in the monitoring coil from the azimuth calculation result (1807), that is, the monitoring signal. Then, the intensity value of the monitoring signal is stored in the data area of the main memory (1809) as monitoring coil peak value information (1812) and is continuously updated as a history. The CPU (1806) performs a process (details will be described in detail below) for terminating the process A, with the series of processes so far in the second calculation process excluding the initial process, that is, the process A as one step. Repeat until

  While continuing the process A, the CPU (1806) continues to refer to the monitoring coil peak value information (1812) from the start of the process A to n steps according to the drive control program (1802). Then, it is determined whether or not the intensity value of the monitoring signal has reached the maximum value until the n steps. When it is determined that the intensity value of the monitoring signal has reached the maximum value until the n step, the process A is terminated at the n step. It should be noted that the numerical value of n for the n steps is preferably input as an example through the I / O (1811) in consideration of detection conditions.

  As described above, when it is determined that the intensity value of the monitoring signal has reached the maximum value up to the n step, the CPU (1806) temporarily stops the process A at the n step. Then, according to the drive control program (1802), based on the history of the monitoring coil peak value information (1812), the monitoring difference value information A (1813) is generated and stored in the data area of the main memory (1809). More specifically, first, the CPU (1806) refers to the monitoring coil peak value information (1812) according to the drive control program (1802). Based on the reference, it is determined at which step up to the n steps the intensity value of the monitoring signal has reached the maximum value. Then, the difference value between the number of steps when the intensity value of the monitoring signal reaches the maximum value, that is, the maximum value step number and the numerical value of n is calculated and set as monitoring difference value information A (1813).

  The CPU (1806) generates the correction signal A (1814) based on the monitoring difference value information A (1813) according to the drive program (1801), and generates the I / O (1811) and the D / A board (1612). To the motor A (1607). The correction signal A (1814) is a signal for driving the motor A (1607) in the direction opposite to the direction in the process A by the difference value step. Upon receiving this correction signal A (1814), the motor A (1607) is driven to correct the directions of the three sets of coils. The process from the process A to this point will be referred to as a sequence A.

  Next, based on the same processing as in sequence A, the direction of the three sets of coils is driven in the direction of the coil fixture B (1605), and adjustment is performed so that the monitoring coil generates the maximum electromotive force. This entire process is referred to as a sequence B.

  Further, based on the same processing as in sequence A, the direction of the three sets of coils is also driven in the direction of the coil fixture C (1606), and adjustment is performed so that the monitoring coil generates the maximum electromotive force. This entire process is called a sequence C.

  Next, the maximum value recorded in sequence A in monitoring coil peak value information (1812), that is, the maximum value A, and the maximum value recorded in sequence C in monitoring coil peak value information (1812). That is, both values of the maximum value C are compared.

  When it is determined that the maximum value C is greater than the maximum value A, the CPU (1806) finally monitors the history of the monitoring coil peak value information (1812) and the monitoring difference value information A to C (1813, 1815). , 1816), a corrected azimuth calculation result (1805) is generated according to the second azimuth calculation program (1803) and displayed on the monitor. This corrected azimuth calculation result (1805) is based on the xyz axis (1615) as to which direction the axis of the monitoring coil is oriented, the angle θ formed by the axis and the xz plane, and the axis and the xy plane. And information such as the angle φ formed by.

The above is an example of the flow of all processes when the first azimuth calculation unit, the drive control unit, and the second azimuth calculation unit are configured by an arithmetic processing unit or the like. FIG. 19 shows a flow chart showing all the processing flows. Note that the description of FIG. 19 is omitted since it is substantially the same as the contents described in the example of the flow of all the processes.
<Effect of Embodiment 5>

According to the present embodiment, an antenna device that can more easily obtain the position of the electromagnetic wave generation source is realized.
<< Embodiment 6 >>
<Overview of Embodiment 6>

The antenna device according to the present embodiment is basically the same as the antenna device according to the first to fifth embodiments. However, the antenna device according to the present embodiment is different from the antenna devices according to the first to fifth embodiments in that each coil of the composite coil portion is a planar coil.
<Functional Configuration of Embodiment 6>

  When the antenna device according to the present embodiment is shown as a functional block diagram, it is almost the same as the functional block diagram shown in FIG.

  FIG. 20 shows a conceptual diagram of a portion of the antenna device according to the present embodiment, that is, a reception portion including the composite coil portion, the sheath portion, and the first and second matching capacitors. In the present embodiment, the receiving portion includes a receiving portion A including a planar coil A (2001), a sheath A (2002), a first matching capacitor A (not shown), and a second matching capacitor A (not shown). A receiving portion B including a planar coil B (2003), a sheath B (2004), a first matching capacitor B (not shown), and a second matching capacitor B (not shown), and a planar coil C (2005). And a receiving portion C including a sheath C (2006), a first matching capacitor C (not shown), and a second matching capacitor C (not shown). As shown in FIG. 20, in the present embodiment, the receiving portion is cut into the inner cavity portion of the receiving portion C to insert the receiving portion B, and further, the receiving portion B is cut into the inner cavity portion of the receiving portion B. The receiving portion can be easily assembled by inserting A or the like. On the contrary, it is also possible to disassemble the reception part and use any one of the reception parts A to C independently according to the intended use. Further, by using a microstrip antenna for the planar coil, it becomes possible to cope with various polarizations.

In addition, as for the connection of the said receiving part AC and the cable with a ground shield, each planar coil AC (2001, 2003, 2005) is not covered with sheath AC (2002, 2004, 2006). It is preferable to carry out at the location (2007 to 2009).
<Effect of Embodiment 6>

According to this embodiment, an antenna device that can be easily assembled and disassembled is realized.
<< Embodiment 7 >>
<Outline of Embodiment 7>

The antenna device according to the present embodiment is basically the same as the antenna device according to the first to fifth embodiments. However, the antenna device according to the present embodiment is different from the antenna devices according to the first to fifth embodiments in that the composite coil unit is configured by winding each coil wire around a sphere or a cube.
<Functional Configuration of Embodiment 7>

  When the antenna device according to the present embodiment is shown as a functional block diagram, it is almost the same as the functional block diagram shown in FIG.

  FIG. 21 shows a conceptual diagram of a portion, that is, a receiving portion, of the antenna device according to the present embodiment, which is composed of a composite coil portion, a sheath portion, and first and second matching capacitors. FIG. 21A is a conceptual diagram of the case where the receiving portion is wound around a sphere. As shown in FIG. 21 (a), the receiving part of the present embodiment first attaches each sheath (2101 to 2103) into which the coil wire of each coil is inserted to the sphere (2104) as it is. Constitute. Here, before attaching each sheath (2101 to 2103) so that the respective centers of the respective sheaths (2101 to 2103) are coincident and the respective axes are orthogonal to each other, a magic pen is attached to the sphere (2104). Write a line, etc. Then, when the respective sheaths (2101 to 2103) and the sphere (2104) are combined, the respective centers of the respective sheaths (2101 to 2103) are easily aligned, and the respective axes are mutually connected. Can be orthogonal to each other. Further, the coil wire, the first and second matching capacitors, and the ground shielded cable may be connected to each other by providing connection boxes (2105 to 2107) on the circumference of each sheath.

FIG. 21B is a conceptual diagram when the receiving part is wound around a cube (2111). As shown in FIG. 21 (b), the receiving portion (2108 to 2110) can be attached to the cube (2111) in the same manner as it is attached to the sphere. However, in this case, the sheath must be formed in a substantially square shape. Similarly, the coil wire must be substantially square. Thus, by attaching the receiving part (2108 to 2110) to the cube (2111), the receiving part (2108 to 2110) can be placed on an arbitrary plane, for example, on the roof of a car (2112), with a suction cup ( 2113) or the like.
<Effect of Embodiment 7>

According to this embodiment, an antenna device that can be easily assembled and disassembled is realized.
<< Embodiment 8 >>
<Outline of Embodiment 8>

The antenna device according to the present embodiment is basically the same as the antenna device according to the first to fifth embodiments. However, in the antenna device according to the present embodiment, the composite coil unit is wound around an annular guide for winding each coil wire in a circle or a rectangular annular guide for winding each coil wire in a square outline shape. The antenna device is different from the antenna device according to the first to fifth embodiments in that it is configured by turning.
<Functional Configuration of Embodiment 8>

  When the antenna device according to the present embodiment is shown as a functional block diagram, it is almost the same as the functional block diagram shown in FIG.

  An example of the annular guide is shown in FIG. As illustrated in FIG. 22 (a), the annular guide is an elongated flat plate having guides that are perpendicular to both sides of the long side and connected to both ends of the short side to form a perfect circle, that is, a circular rail (2201-2203). Are assembled so that their centers coincide and their axes are orthogonal to each other. In the present embodiment, as an example, a composite coil portion is obtained by fitting a perfect-shaped sheath (2204 to 2206) into which a coil wire is inserted between guides of the circular rails (2201 to 2203). And the sheath part. With this configuration, the sheath (2204 to 2206) is always kept in the state where the respective centers are aligned and the respective axes are orthogonal to each other without the sheath (2204 to 2206) being detached from the circular rail. be able to.

  An example of the rectangular annular guide is shown in FIG. As illustrated in FIG. 22 (b), the rectangular annular guide is formed by connecting an elongated flat plate having guides perpendicular to both sides of its long side to a rectangular shape by connecting both ends of its short side, that is, a square rail (2207 to 2209). Are assembled so that their centers coincide and their axes are orthogonal to each other. In the present embodiment, as an example, by inserting a rectangular sheath (2210 to 2212) into which a coil wire is inserted between guides of the rectangular rails (2207 to 2209), the composite coil portion and Configure the sheath. With this configuration, the sheaths (2210 to 2212) are always kept at the same center and the axes are orthogonal to each other without the sheaths (2210 to 2212) being detached from the square rail. be able to.

FIG. 23 shows another example of the annular guide. In FIG. 23, the annular guide includes a guide AC (2301) and a guide B (2302). The guide AC (2301) was prepared by connecting two ends of a hollow cylinder with a circular shape and combining them so that their centers coincide and the axes are orthogonal to each other. Consists of things. The guide B (2302) is formed by connecting both ends of a hollow cylinder having a hollow shape to form a perfect circle. Inside the guide AC (2301) and the guide B (2302), a perfect-shaped sheath (2303 to 2305) having a coil wire inserted therein can be passed. Thus, if the annular guide is formed in a cylindrical shape, the sheath (2303 to 2305) is almost certainly not detached from the annular guide. In this way, it is possible to configure a more robust antenna device.
<Effect of Embodiment 8>

  According to this embodiment, a more sturdy antenna device can be realized.

Functional block diagram of the antenna device in the first embodiment The figure which shows an example of a structure of the antenna apparatus concerning Embodiment 1. The figure explaining the function in which the sheath part concerning Embodiment 1 cancels the electric potential difference which arises between the ground which is a grounding potential point, and a composite coil part. Functional block diagram of the antenna device according to the second embodiment The figure for demonstrating the 1st matching capacitor in Embodiment 2. Functional block diagram of an antenna apparatus according to the third embodiment The figure for demonstrating the 2nd matching capacitor in Embodiment 3 Functional block diagram of an antenna device according to Embodiment 4 The figure explaining the method of calculating how much magnetic field component of each electromagnetic wave each coil of a composite coil part receives The figure which shows one of the specific Examples of Embodiment 4. The figure explaining the hardware constitutions in the case where the first azimuth calculation unit is constituted by a general-purpose personal computer in a specific example of the fourth embodiment. The figure which shows a mode that the component derived from the magnetic field component of electromagnetic waves is extracted from the electromotive force which a composite coil part produced in the specific Example of Embodiment 4. FIG. The figure which shows an example of the said direction calculation result projected on the monitor in the specific Example of Embodiment 4. The figure which shows the processing flow of the 1st direction calculation part in the specific Example of Embodiment 4. Functional block diagram of an antenna apparatus according to Embodiment 5 Example of mechanism of antenna device according to embodiment 5 The figure explaining the mechanical relationship of the receiving part shown in FIG. 16, the coil fixture A, the coil fixture C, and the motor A In the antenna apparatus of Embodiment 5, the figure which shows an example of a hardware structure at the time of comprising a 1st azimuth | direction calculation part, a drive control part, and a 2nd azimuth | direction calculation part with arithmetic processing units, such as a personal computer. The figure which shows the flow of all the calculation processes in the example of a mechanism of the antenna apparatus as described in Embodiment 5. Conceptual diagram of the receiving part of the antenna device according to the sixth embodiment. Conceptual diagram of the receiving part of the antenna device according to the seventh embodiment. The figure which shows an example of the cyclic | annular guide concerning Embodiment 8, and a rectangular cyclic | annular guide. The figure which shows another example of the cyclic | annular guide concerning Embodiment 8. FIG.

Explanation of symbols

0201 Coil 0202 Coil 0203 Coil 0204 Sheath 0205 Sheath 0206 Sheath 0207 Location not covered by the sheath on the coil circumference 0208 Location not covered by the sheath on the coil circumference 0209 Not covered by the sheath on the coil circumference Location 0210 Cable with ground shield 0211 Cable with ground shield 0212 Cable with ground shield 0213 Oscilloscope 0214 Enlarged view of location where coil wire of each coil of composite coil portion, cable with ground shield, and sheath portion are connected 0215 Coaxial Cable 0216 Coil cable end 0217 Coaxial cable inner conductor 0218 Coil line end other 0219 Coaxial cable outer conductor 0220 Sheath

Claims (12)

A composite coil portion configured by combining three sets of coils in which the respective centers coincide and the respective axes are orthogonal to each other;
A detection unit for detecting the electromotive force generated in the coil by the external electromagnetic wave for each coil;
A cable with a ground shield that connects the coil and the detector;
A sheath made of a nonmagnetic conductor material covering the coil wire of the coil;
An antenna device.   The antenna device according to claim 1, wherein one end of the sheath portion is grounded via a shield of a cable with a ground shield.   The antenna device according to claim 1 or 2, wherein a first matching capacitor for impedance matching is disposed between the coil wire on the other end side of the sheath portion and the axis of the cable with ground shield.   The antenna device according to any one of claims 1 to 3, wherein a second matching capacitor for impedance matching is disposed between a coil wire on one end side of the sheath portion and a coil wire on the other end side of the sheath portion. .   The antenna device according to any one of claims 1 to 4, further comprising a first azimuth calculation unit that calculates an azimuth of the electromagnetic wave generation source in accordance with an electromotive force of each coil detected by the detection unit. A drive unit capable of driving the composite coil unit to change the direction of the coil in a combined state;
A drive control unit that controls the drive unit so that the electromotive force of the specific coil detected by the detection unit is maximized;
A second azimuth calculation unit that calculates the azimuth of the electromagnetic wave generation source from the direction of the coil when the electromotive force of the specific coil is maximized;
The antenna device according to claim 1, comprising:   Each antenna is a planar coil, The antenna device as described in any one of Claim 1 to 6.   The antenna device according to any one of claims 1 to 7, wherein the composite coil unit is configured by winding each coil wire around a sphere.   The antenna device according to any one of claims 1 to 7, wherein the composite coil unit is configured by winding each coil wire around an annular guide for winding the coil wire in a circular shape.   The antenna device according to any one of claims 1 to 7, wherein the composite coil unit is configured by winding each coil wire around a cube.   The antenna device according to any one of claims 1 to 7, wherein the composite coil section is configured by winding each coil wire around a rectangular annular guide for winding the coil wire into a square outline.   The antenna device according to claim 1, wherein each coil wire has a plurality of turns.

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