JPH1144720A - Electric field sensor and electric field intensity measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric field sensor having no capacitive error due to unbalance of capacitive coupling caused by asymmetrical structure, by arranging a diode at the central position between antenna elements. SOLUTION: A diode 109 is arranged at a central position between antenna elements 101a, 101b. With this structure, balance of capacitive coupling between the antenna elements 101a, 101b and feeder lines 104 is maintained and generation of capacitive error is prevented. Since the antenna elements 101a, 101b are not made of dielectric and made of metal conductor, they have high mechanical strength, and handling thereof during the measurement is easy. Since all conductors are connected to each other by mechanical fixation, thermo- electromotive force to be generated at the time of temperature change is eliminated in comparison with the connection by the conductive adhesive agent, and conductivity is improved so as to reduce the loss, and accurate measurement is possible with the electric field intensity at several ten mV/m or less. Capacity coupling between the antenna elements 101a, 101b and the feeder lines 104 is balanced so as to prevent the generation of capacitive error.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric field sensor and an electric field intensity measuring device used for measuring electric field intensity in a space.

[0002]

2. Description of the Related Art With the spread of computers and mobile phones, suppression of radiated electromagnetic waves generated from these electronic devices has become an issue. I have. Generally, the magnitude of an electromagnetic wave radiated from an electronic device is represented by an electric field strength.
By the way, when measuring the electric field strength of the electromagnetic wave, the feed line of the antenna disturbs the electric field, and the induced electromotive force excited in the feed line causes an error in the electric field strength measurement. Further, biconical antennas and log-peripheral antennas have been proposed in order to perform broadband measurement. However, the antenna size is so large that it cannot be used as a broadband electric field probe having a minute spatial resolution.

[0003] Therefore, a wideband small dipole antenna that does not disturb the electric field due to the feeder line or excite the induced electromotive force is proposed (National Bureau of Standards Technical Note 10).
33: Design and Calibration of the NBS Isotropic El
ectric-Field Monitor: EBLarsen). This wideband small dipole antenna is shown in FIG. The broadband small dipole antenna includes antenna elements 401a and 40a.
1b, a diode 409, and a feed line 404. The antenna elements 401a and 401b are formed to be shorter than the signal wavelength in order to realize a wideband small dipole antenna having minute spatial resolution, and a diode 409 is attached between the antenna elements 401a and 401b with a conductive adhesive 411. I have. When an output signal (1 W or less) of a consumer communication device is received at a distance of about 10 m, the electric field strength measured by the dipole antenna is several tens mV / m.
It becomes below. Therefore, a highly sensitive zero-bias Schottky barrier diode is used as the diode 409 for detecting the received signal. Also, the antenna element 40
Feeding line 404 extending from 1a and 401b is
In order to suppress the induced electromotive force excited in the electric field 04 and to reduce the influence of the feed line 404 on the electric field, about 80 kΩ /
It is composed of a high-resistance wire having a resistivity of 1 cm.

When a small dipole antenna of the type described above receives a high frequency in space, the received signal is detected by a diode 409 attached to the antenna elements 401a and 401b and converted into a DC signal. The signal detected by the diode 409 propagates through the feed line 404 and is sent to the next-stage amplifier. However, it is generally known that a high-frequency signal has a very large loss when propagating through a feed line or a resistance line. As in this example, when a signal propagates through a feed line formed of a high-resistance line, the output becomes very small. When a small signal after the propagation of a high resistance wire is amplified, noise increases, and accurate measurement of electric field strength cannot be performed. Further, when a high-frequency signal is amplified near the antenna immediately after reception, the amplifier itself causes disturbance of the electric field. Therefore, a diode 409 that attaches the received high-frequency signal to the antenna elements 401a and 401b
By directly detecting the signal, converting the signal into a DC signal, and propagating the signal through a high-resistance wire, the electric field is not disturbed, and measurement with little loss is realized. However, the antenna elements 401a, 40
Since the connection between 1b and the diode 409 is made by the conductive adhesive 411 having poor conductivity, the loss at this portion is inevitably increased. In addition, when the conductive adhesive 411 is used, a thermoelectromotive force is generated at the joint due to a change in temperature, and an error of a level that cannot be ignored in measuring an electric field distribution of several tens mV / m or less may be caused.

Further, as a device for improving the above-mentioned wideband micro dipole antenna, Japanese Patent Laid-Open No. 53-15728 discloses a diode device for submillimeter waves. FIG. 10 shows the configuration of this sub-millimeter wave diode device. One antenna element 501a provided on the dielectric substrate 508
One terminal of the detection diode 509 is thermocompression-bonded.
The other terminal of the detection diode 509 is thermo-compressed to the conductor piece 512 on the other antenna element 501b,
12. As the feed line 504, a strip line extending in a direction perpendicular to the antenna elements 501a and 501b is used. The power supply line 504 includes the conductor piece 51.
2, the other terminal of the detection diode 509 is thermocompressed,
They are connected via conductor pieces 512. As a result, the loss of the diode due to the use of the conductive adhesive and the increase in the loss due to the increase in the resistivity can be prevented.

[0006]

However, the diode device for submillimeter waves has the following problems to be solved as described above. 1) Since the shape of the device is asymmetrical left and right, capacitive coupling unbalance occurs between the antenna elements and in the feed line, causing a capacitive error. 2) With an antenna provided only in one axis direction, signals of orthogonal electric fields such as vertical polarization and horizontal polarization cannot be measured at the same time, and two-dimensional electric field intensity components are structurally measured at the same time. It is difficult to construct a two-axis antenna and a multi-axis antenna having more axes than possible. 3) Further, in the measurement of the surface distribution of the electric field where the number of times of movement of the antenna is large, the mechanical strength is weak structurally, and handling during the measurement is difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric field sensor and an electric field intensity measuring device used for measuring an electric field intensity in a space where there is no capacitive error due to capacitive coupling imbalance caused by an asymmetric structure. is there.

It is another object of the present invention to provide an electric field sensor and an electric field intensity measuring device used for measuring electric field intensity in a space in which orthogonal components can be measured simultaneously.

Still another object of the present invention is to provide an electric field sensor and an electric field intensity measuring device used for measuring an electric field intensity in a space having high mechanical strength and easy handling.

[0010]

This and other objects are achieved by any one of the following constitutions (1) to (4). (1) A dipole antenna having two antenna elements 101a and 101b, a diode module 102 in which a diode 109 is connected between two metal conductors 110a and 110b provided on a dielectric substrate 108, and a feed line 104
And the diode 109 is disposed so as to be located at the center between the antenna elements 101a and 101b, and the antenna elements 101a and 101b and the metal conductor 110 are disposed.
An electric field sensor used for measuring electric field strength, wherein a and 110b and the feed line 104 are mechanically fixed and electrically connected.

According to the configuration (1), since the diode 109 is disposed so as to be located at the center between the antenna elements 101a and 101b, the capacitive coupling between the antenna elements 101a and 101b and the feed line 104 is maintained in balance. No capacitive error occurs. In addition, since the antenna elements 101a and 101b are made of a metal conductor instead of a dielectric, the mechanical strength is high and handling during measurement is easy. Further, since all the conductors are connected by mechanical fixing, there is no thermo-electromotive force generated when the temperature changes as compared with the connection using a conductive adhesive, and the conductivity is good and the loss is small. Accurate measurement can be performed even at an electric field strength of mV / m or less.

(2) Two antenna elements 201a, 20
1b and a dielectric substrate 108
A diode module 202 in which a diode 109 is connected between two metal conductors 110a and 101b provided in
A feed line 204, and the diode 109 is disposed so as to be located at the center between the antenna elements 201a and 201b, and the antenna elements 201a and 201b, the metal conductors 110a and 101b, and the feed line 204 are mechanically connected to each other. An electric field sensor used for measuring the electric field strength, which is fixedly and electrically connected and fitted to a pedestal 203 made of a dielectric material.

According to the configuration (2), in addition to the configuration (1), the antenna elements 201a and 201b made of metal conductors and the feeder 204
And the diode module 202 is mounted on the dielectric pedestal 20.
3, the mechanical strength is high, and it is easy to handle even if it receives an impact such as a drop or a collision without being damaged.

(3) Two antenna elements 301a, 30
1b and a dielectric substrate 108
A diode module 302 in which a diode 109 is connected between two metal conductors 110a and 110b provided in
A feed line 304, and the diode 109 is disposed so as to be located at the center between the antenna elements 301a and 301b, and the antenna elements 301a and 301b, the metal conductors 110a and 110b, and the feed line 304 are mechanically connected to each other. A first electric field sensor 1 and a second electric field sensor 2 which are fixed and electrically connected to each other are provided in a direction orthogonal to each other, and are used for measuring electric field strength fitted to pedestals 303a and 303b made of a dielectric material. Electric field sensor.

According to the configuration (3), in addition to the configuration (2),
Since there are orthogonal two-axis antennas, it is possible to simultaneously measure each component with respect to the electric field strength where two-dimensional polarization planes such as vertical polarization and horizontal polarization are orthogonal.

In addition to the configurations (1) to (3), if the diode is a zero-bias Schottky barrier diode, a highly sensitive electric field intensity measurement can be performed without applying a bias current.

Further, in addition to the constitutions (2) and (3), if the pedestal to be used uses a low dielectric constant dielectric such as a fluororesin, the measured value does not have any electrical influence.

(4) An electric field strength measuring device used together with the electric field sensor according to any one of the constitutions (1) to (3), wherein a small signal amplifier and a measuring device for the signal are provided. Electric field strength measuring device provided.

According to the configuration (4), it is possible to obtain an electric field intensity measuring apparatus having the features of the constitutions (1) to (3) for measuring the electric field intensity.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on specific examples. FIG. 1 is a perspective view for explaining a specific example 1 of the electric field sensor used for measuring the electric field intensity of the present invention, FIG. 2 is a developed view thereof, and FIG. 3 is a plan view of the diode module 102 (a). , And a front view (b). The electric field sensor used for measuring the electric field strength in the space according to the present invention is a dipole antenna having two antenna elements 101a and 101b and a dipole antenna provided on a dielectric substrate 108.
A diode module 102 having a diode 109 connected between two metal conductors 110a and 110b;
04. The diode 109 is disposed so as to be located at the center between the antenna elements 101a and 101b, and the antenna elements 101a and 101b and the metal conductors 110a and 110b are disposed.
10b and the power supply line 104 are screwed, mechanically fixed, and electrically connected.

According to the first embodiment, the diode 109
Is disposed so as to be located at the center between the antenna elements 101a and 101b, the capacitive coupling between the antenna elements 101a and 101b and the feed line 104 is kept in balance, and no capacitive error occurs. Also, the antenna elements 101a, 10a
Since 1b is made of a metal conductor instead of a dielectric, it has high mechanical strength and is easy to handle during measurement. Further, since all the conductors are connected by mechanical fixing, there is no thermo-electromotive force generated when the temperature changes as compared with the connection using a conductive adhesive, and the conductivity is good and the loss is small. Accurate measurement can be performed even at an electric field strength of mV / m or less.

FIG. 3 is a plan view (a) and a front view (b) of the diode module 102. The diode module includes two metal conductors 1 provided on a dielectric substrate 108.
10a and 110b, and a diode 109 connected between the two metal conductors 110a and 110b. The dielectric substrate 108 has a width of 5 mm, a length of 50 mm, and a thickness of 0.8.
Deposit metal conductors such as copper on a glass epoxy board of mm,
The metal conductor at the center was removed by 1 mm in width by etching. The two electrodes of the diode 109 are connected between two metal conductors 110a and 110b on the dielectric substrate 108 by thermocompression bonding. At this time, the diode 109
It is arranged so as to be located at the center of the dielectric substrate 108. The connection between the diode 109 and the two metal conductors 110a and 110b on the dielectric substrate 108 is made by connecting the electrode of the diode 109 to the dielectric substrate 1 in order to suppress the generation of thermoelectromotive force.
It is sufficient that the metal conductor on the substrate 08 can be brought into close contact with the metal conductor, and thermocompression bonding and soldering are preferable.

The diode 109 used here is desirably a zero bias Schottky barrier diode. When a signal is transmitted with general transmission power, the electric field strength received by the antenna is several tens mV / m or less. Tens of mV / m
In the case where the following signals are detected by a diode, the sensitivity of a normal diode significantly decreases because the threshold does not exceed unless a bias current is applied to the measurement signal. for that reason,
It is difficult to use a normal diode for measuring an electric field strength of several tens mV / m or less. In order to perform highly sensitive electric field strength measurement, it is necessary to use a zero-bias Schottky diode that does not require application of a bias current. A Schottky barrier diode is a diode that utilizes a potential barrier generated by contact between a metal and a semiconductor.
It has features such as fast response time and low rising potential. Among the Schottky barrier diodes, those that operate only by inputting a signal without applying a bias current are zero-bias Schottky barrier diodes.

Next, the antenna elements 101a and 101b are
A metal bar having a length of 75 mm, a width of 5 mm, and a thickness of 3 mm is used. The metal rod does not need to be a prism, and may be a cylinder, but it is necessary to flatten the fixed portion so that the antenna elements 101a and 101b and the diode module 102 are sufficiently fixed. The feed line 104 has a resistivity of 3
A high resistance wire of 50 Ω / cm was used. Feeding line 104
Is a polycarbonate screw 105 together with the antenna elements 101a, 101b and the diode module 102,
A dipole antenna is formed by using a nut 106 and a metal washer 107 so as to be sufficiently press-bonded. Here, it is possible to reduce the loss and prevent a minute error by sufficiently compressing the respective parts to improve the signal conduction. It is desirable that the screws 105 and nuts 106 be made of resin instead of metal so that there is no electrical influence.

According to the specific example 1 of the electric field sensor used for measuring the electric field intensity of the present invention, all the conductors are connected by thermocompression bonding and screwing. In comparison, since there is no thermoelectromotive force generated when the temperature changes, the conductivity is high, and the loss is small, it is possible to accurately measure even an electric field strength of several tens mV / m or less. Also,
Since the antenna element is made of a metal conductor instead of a dielectric, it has high mechanical strength and is easy to handle during measurement. Furthermore, since the diode is arranged so as to be located at the center between the antenna elements, the capacitive coupling between the antenna elements and between the antenna element and the feed line is kept in balance, and no capacitive error occurs.

Next, a second embodiment of the electric field sensor used for measuring the electric field intensity according to the present invention will be described with reference to FIGS. FIG. 4 is a perspective view for explaining a specific example 2 of the electric field sensor used for measuring the electric field intensity according to the present invention, and FIG. 5 is a developed view thereof. The specific example 2 of the electric field sensor used for measuring the electric field strength according to the present invention has two antenna elements 2
01a and 201b, a diode module 202 in which a diode 109 is connected between two metal conductors 110a and 110b provided on a dielectric substrate 108, and a feed line 204.
09 is located at the center between the antenna elements 201a and 201b, and the antenna elements 201a and 201b
1b, the metal conductors 110a and 110b, and the power supply line 204 are mechanically fixed and electrically connected to each other, and fitted to a pedestal 203 made of a low dielectric constant dielectric.

According to the specific example 2, in addition to the specific example 1, the metal conductor antenna element 201, the feed line 204 and the diode module 202 are formed of the low dielectric constant pedestal 20.
3, the mechanical strength is high, and it is easy to handle even if it receives an impact such as a drop or a collision without being damaged. The pedestal 203 used is made of a low dielectric constant dielectric material such as fluororesin, so that the measured value does not have any electrical influence.

The antenna element 20 used in the specific example 2
1a, 201b and the diode module 202 have the same shape and the same manufacturing method as those of the first embodiment. The feed line 204 having the same resistivity as that of the specific example 1 was used.

The pedestal 203 for fixing the antenna elements 201a and 201b and the diode module 202 is made of fluororesin having a diameter of 70 mm and a thickness of 15 mm.
A groove having a width of 5 mm and a depth of 5 mm is excavated so that 1a, 201b and the diode module 202 can be fitted. The material of the pedestal 203 may be a low dielectric constant dielectric such as a fluororesin.

The shape of the pedestal 203 is the same as that of the antenna element 201.
In order to prevent a capacitive error occurring due to a capacitive coupling imbalance between a and 201b and in the feed line 204, the disk was machined into the most symmetrical disk shape. However, the shape of the pedestal 203 need not be a disk shape, and may be a polygonal object such as a triangle or a quadrangle as long as left-right symmetry is maintained.

The antenna elements 201a and 201b and the diode module 202 are fitted into grooves provided in the pedestal 203, and the antenna elements 201a and 201b are screwed.
a, 201b, diode module 202 and pedestal 2
Drill a hole through 03. Further, a hole is formed in the pedestal 203 so that the feed line 204 can pass therethrough. Antenna element 201
a, 201b, diode module 202 and pedestal 2
All holes to be drilled in 03 must be made in a place where left and right symmetry is maintained. By making the structure symmetrical, the capacitive coupling between the antenna elements 201a and 201b and the feed line 204 is balanced, and the capacitive error is eliminated.

The feeder line 204 is passed through the pedestal 203, and the antenna elements 201a and 201b, the diode module 20
2 is inserted into the groove of the pedestal 203, and then the antenna element 201, the diode module 202, the antenna element 201, and the feeder line 20 are formed using polycarbonate screws 205 and nuts 206 and metal washers 207.
4 is fixed so as to be sufficiently pressed to form a dipole antenna. By sufficiently crimping each part, signal conduction can be improved and loss can be reduced. The screws 205 and nuts 206 need to be made of resin instead of metal in order to eliminate electric influence.

Next, a third embodiment of the electric field sensor used for measuring the electric field intensity according to the present invention will be described with reference to FIGS. FIG. 6 is a perspective view illustrating a specific example 3 of the electric field sensor used for measuring the electric field intensity according to the present invention, and FIG. 7 is a developed view thereof. The electric field strength measuring apparatus of the present invention includes the antenna elements 301a and 301b, the diode module 30
2. It comprises a pedestal 303 and a feed line 304. As the antenna elements 301a and 301b and the diode module 302, two sets each having the same shape and processing as those of the first embodiment are prepared, and used as a first antenna and a second antenna orthogonal to the first antenna. The same high resistance wire as that of the specific example 1 was used for the feed line 304. The pedestal 303 includes the antenna elements 301a and 301b and the diode module 302.
5mm wide and 3.5mm deep so that
Drill a mm groove. Further, a second groove orthogonal to the previously excavated groove is excavated so that the orthogonal antenna element 301 can be fitted into the pedestal 303. The second groove has a width of 5 mm and a depth of 2.5 mm. As in the specific example 2, the antenna elements 301a and 301b and the diode module 302 are fitted into the grooves, and holes for screwing and holes for passing the feed line 304 are formed. Pedestal 303
Through the feed line 304 and the antenna elements 301a, 30
1b, After inserting the diode module 302 into the groove, the antenna element 3 is formed using a polycarbonate screw 305, a nut 306, and a metal washer 307.
01a, 301b and the diode module 302, and the antenna element 301 and the feed line 304 are fixed so as to be sufficiently press-bonded to form a dipole antenna. By sufficiently crimping each part, it is possible to improve signal conduction and reduce loss.

As in the configuration 2, the pedestal 303 has a disk shape, which is the most symmetrical shape, in order to prevent a capacitive error caused by capacitive coupling imbalance between the antenna elements 301a and 301b and the feed line 304. The shape of the pedestal 303 does not need to be a disk shape, and may be a polygon such as a quadrangle, but the antenna element 3 has a completely symmetric shape.
It is necessary to prevent the occurrence of capacitive coupling unbalance between the power supply line 304a and the power supply line 304a. Combining the pedestals 303 so that the antennas are orthogonal to each other,
Drill holes for screwing. The holes for screwing must be drilled in a position that maintains symmetry. Pedestal 303
The two are fixed with screws 305 and nuts 306 made of resin such as polycarbonate to form a two-axis dipole antenna. The screws 305 and the nuts 306 for fixing the pedestals 303 to each other are preferably made of resin such as polycarbonate instead of metal so as not to have an electric influence.

When measuring the electric field strength component in the three-dimensional space, the first or second antenna of the two-axis antenna is set to 90 degrees.
° can be measured by rotating. However, by providing the third antenna in a direction orthogonal to the first and second antennas to simplify the measurement, it is possible to simultaneously measure the electric field strength components in the three-dimensional space.

Next, with reference to FIG. 8, a specific example of the electric field intensity measuring apparatus used for measuring the electric field intensity according to the present invention will be described. FIG. 8 is a block diagram for explaining a specific example of the electric field intensity measuring device used for measuring the electric field intensity according to the present invention. An electric field intensity measuring device used for measuring electric field intensity according to the present invention is an electric field intensity measuring device used together with the electric field sensor described in any one of Embodiments 1 to 3, and is a known DC amplifier. Etc., and a measuring device for the signal.

In a small signal amplifier, a drift voltage is generated due to a temperature change in a commonly used amplifier, which causes a measurement error. The small signal amplifier of the present invention uses a small signal amplifier having a drift voltage of 5 μV or less so that accurate measurement can be performed even with an electric field strength of several tens mV / m or less. The amplified signal is measured using a voltmeter, an oscilloscope, or the like.

According to this embodiment, an electric field intensity measuring apparatus having the features of the first to third embodiments for measuring the electric field intensity can be obtained.

[0039]

Since the present invention is configured as described above, it has the following effects. (1) Since the conductors are connected by crimping or thermocompression,
The measurement of the electric field strength of several tens mV / m or less can be performed without error without generating the thermoelectromotive force due to the temperature rise. Further, since the conductors are connected by crimping or thermocompression bonding, the conductivity is good and the loss is very small as compared with the case where a conductive adhesive is used. The mechanical strength is also stronger and easier to handle than when using a conductive adhesive.

(2) Since the metal rod is used for the antenna element, the mechanical strength is high and the handling is easy as compared with the case where a dielectric is used.

(3) Since the overall shape of the device is completely symmetric, no capacitive error occurs due to capacitive coupling imbalance between the antenna elements and the feed line.

(4) Since the antenna element and the diode module are incorporated in the low dielectric constant pedestal, the mechanical strength is high and the handling is easy.

(5) A two-axis micro dipole antenna can be easily formed, and two-dimensional orthogonal electric field strength components can be measured simultaneously.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a specific example 1 of an electric field sensor of the present invention.

FIG. 2 is a development view of Example 1 of the electric field sensor of the present invention.

FIG. 3 is a plan view (a) and a front view (b) of the diode module of Example 1;

FIG. 4 is a perspective view showing a specific example 2 of the electric field sensor of the present invention.

FIG. 5 is a development view of Example 2 of the electric field sensor of the present invention.

FIG. 6 is a perspective view showing a specific example 3 of the electric field sensor of the present invention.

FIG. 7 is a development view of Example 3 of the electric field sensor of the present invention.

FIG. 8 is a block diagram showing a specific example of the electric field strength measuring device of the present invention.

FIG. 9 is a front view showing a conventional small dipole antenna.

FIG. 10 is a perspective view showing a conventional sub-millimeter wave diode device.

[Explanation of symbols]

 101a, 101b, 201a, 201b, 301a, 301b Antenna element 102, 202, 302 Diode module 203, 303a, 303b Base 104, 204, 304 Feed line 105, 205, 305 Resin screw 106, 206, 306 Resin nut 107 , 207, 307 Washer 108 Dielectric substrate 109, 209, 309 Diode 110a, 110b Metal conductor

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 25, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

Claims (6)

[Claims] 1. A dipole antenna having two antenna elements, a diode module in which a diode is connected between two metal conductors provided on a dielectric substrate, and a feed line, wherein the diode is connected between the antenna elements. An electric field sensor used for measuring electric field intensity, wherein the electric field sensor is disposed so as to be located at the center of the antenna, and the antenna element, the metal conductor, and the feed line are mechanically fixed and electrically connected. 2. A dipole antenna having two antenna elements, a diode module in which a diode is connected between two metal conductors provided on a dielectric substrate, and a feed line, wherein the diode is connected between the antenna elements. The antenna element, the metal conductor, and the feed line are mechanically fixed and electrically connected to each other, and the electric field strength is fitted to a pedestal made of a dielectric material. Electric field sensor used for 3. A dipole antenna having two antenna elements, a diode module in which a diode is connected between two metal conductors provided on a dielectric substrate, and a feed line, wherein the diode is connected between the antenna elements. The antenna element, the metal conductor, and the feed line are mechanically fixed and electrically connected to each other.
An electric field sensor used for measuring electric field strength, wherein the electric field sensor and the second electric field sensor are provided in a direction orthogonal to each other and fitted to a pedestal made of a dielectric material. 4. The electric field sensor according to claim 1, wherein the diode is a zero-bias Schottky barrier diode, and is used for measuring an electric field intensity. 5. The electric field sensor according to claim 2, wherein the dielectric is a fluororesin, and is used for measuring an electric field intensity. 6. An electric field intensity measuring device used together with the electric field sensor according to claim 1, wherein the electric field comprises a small signal amplifier and a measuring device for the signal. Strength measuring device.