JPH10185981A - Rotary cylinder tem cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary cylinder TEM cell generating standard electromagnetic wave (plane wave) necessary for measuring antenna pattern and the like. SOLUTION: Constituted are of a test region 1 wherein a cylindrical first external conductor 5 and the first internal conductor 4 of which both ends are connected to the second internal conductor 21 and are rotatable are included and a body to be irradiated is put, and a coaxial connector connection region 2 which has functions of connecting a coaxial cable to the main body and rotating for separating the first internal conductor 4 from the first external conductor 5 and a taper region 3 connecting with the coaxial connector connection region. The internal conductor is placed high from the center of the external conductor so as to ensure wider uniform field region and polarity is made arbitrarily controllable in the range of -100 degree to 100 degree. Also the rotation of the internal conductor is made variable by providing a drive shaft outside so that control of polarization and incidence direction of electromagnetic wave are made possible without the motion of the irradiated body itself.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cylindrical TEM.
Cell (TEM cell), especially electromagnetic wave immunity (EMS)
The present invention also relates to a rotating cylindrical TEM cell which is a device for generating a standard electromagnetic wave (plane wave) required for unnecessary electromagnetic wave (EMI) measurement, antenna correction, antenna pattern measurement, and the like.

[0002]

2. Description of the Related Art Conventional TEM cells include crawford TEM cells (Crawford TEM cells), GTEM cells (Giga-Herz TEM cells), and TTEM cells (Triple TEM cells).
ll), WTEM cell (wire TEM cell), improved GTEM
There are various types such as a cell and a TEM cell for automatic measurement, and these are roughly two types, that is, one end having an input / output terminal on one side like a GTEM cell, a WTEM cell, a TTEM cell, and an improved GTEM cell. TEM cell "and insert on both sides like claw-fed TEM cell, asymmetric TEM cell, TEM cell for automatic measurement, 6-terminal TEM cell, etc.
The output terminals can be classified into “end-end TEM cells”, and all of them can be used for unnecessary electromagnetic wave measurement, electromagnetic wave resistance measurement, antenna correction, antenna pattern measurement, and the like.

[0003] However, the former can be applied to not only the far-field but also the near-field test, while the former can be applied not only to the far-field test but also to the near-field test. Since the former cannot measure the dipole term of the quadrature component, the latter is possible,
These are considered different. In particular, both ends TE
Among the M cells, the existing facilities that can adjust the polarization include a prefabricated cylindrical TEM cell, a TEM cell for automatic measurement, and a 6-terminal TE.
There is an M cell, an eight-terminal variable impedance electromagnetic wave generator, in which all facilities except the assembled cylindrical TEM cell have adjustable polarizations of 45 °, 90 ° and 13 °.
It has the disadvantage that it is fixed at 5 degrees and cannot be adjusted for other polarizations.

On the other hand, in the assembled cylindrical TEM cell, since the inner conductor is located at the center of the outer conductor inside the cylindrical outer conductor, the polarization can be arbitrarily adjusted. However, this is not only a narrow polarization, that is, adjustable within a range of about -45 degrees to 45 degrees, but also because the inner conductor is located at the center, a uniform area where the subject is placed Of course, there is a problem that it is difficult to accurately adjust the angle by providing a line to rotate the inner conductor and rotating the inner conductor structurally.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a wider uniform field region in which an object to be irradiated is placed and a wider polarization control range. It is an object of the present invention to provide a rotating cylindrical TEM cell which can be more extended and arbitrarily adjusted in polarization, and can adjust the angle more accurately when the inner conductor is rotated. Another object of the present invention is to make it possible to adjust all polarizations and incident directions of electromagnetic waves without movement of the irradiation target itself, so that not only can the measurement time be shortened when measuring electromagnetic wave immunity and the like, but also the accuracy of measurement can be reduced. And cylindrical cylinder T that can improve reproducibility
It is to provide an EM cell.

[0006]

A rotary cylindrical TEM cell according to the present invention which achieves the above object is provided with a cylindrical first outer conductor and an upper portion from an inner center of the outer conductor, and both ends of which are coaxial connector connection regions. A test area fixed to the second inner conductor of the portion and including a rotatable first inner conductor, where the object to be irradiated is placed;

[0007] A coaxial connector connection area portion for connecting the coaxial cable to the main body and separating and rotating the first inner conductor in the test area from the outer conductor, and a taper connecting the test area and the coaxial connector connection area section. And an area part.

At this time, an irradiation object installation plate on which the test object is provided and fixed, a first support rod for supporting the irradiation object installation plate, and a first support rod are provided below the test area. A rotary table constituted by a second support rod fixedly supported on the box is additionally laid, and a filter box in which a power supply filter and an illuminated object input / output signal filter are provided below the rotary table, First connected and supporting the body
It is preferable to further form a receiver, a second receiver separated from the component parts and connected to a rotatable main body, and a first bearing provided between the first receiver and the second receiver.

In this case, when the second support rod rotates, a joint fixed to the main body is attached between the second support rod and the main body in order to reduce breakage or reduce electromagnetic wave leakage, It is preferable that a second bearing is further provided at a connecting portion of the second holding rod and the joint so that the joint and the second receiver are separated during rotation of the body to facilitate rotation. It is preferable to form a through hole at the center of the first support rod and the second support rod in order to prevent twisting of a signal line or a power supply line supplied from the outside.

[0010] The coaxial connector connection area portion includes:
A second outer conductor connected to the coaxial connector and serving as an external drive shaft for driving the inner conductor; and a second outer conductor connected to the first outer conductor in the test area through a fourth outer conductor in the tapered area. A third outer conductor coupled to
In order to support the second outer conductor on the main body, the second outer conductor is inserted into the second outer conductor through the inner holes of the first and third dielectrics, and a connecting joint connecting the second outer conductor and the third outer conductor. ,
A second inner conductor connected to one end of the first inner conductor for rotating the first inner conductor by driving the second outer conductor, and a coaxial connector pin coupled to one end of the second inner conductor; A first dielectric located between the inner conductor and the second outer conductor, the third outer conductor, and the fourth outer conductor;
It is preferable that the dielectric material is composed of a dielectric and a third dielectric.

At this time, in order to smoothly rotate the second outer conductor and prevent leakage of electromagnetic waves, a third bearing and a fourth bearing are doublely provided at a joint between the second outer conductor and the third outer conductor. It is preferable to provide a ring at the connection site in order to provide the connection in series and to more reliably prevent leakage of electromagnetic waves. In addition, it is preferable that a safety device for preventing the first inner conductor from rotating within a certain range is further mounted on the third outer conductor in the coaxial connector connection area.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a rotary cylindrical TEM cell according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic perspective view of a rotary cylindrical TEM cell according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional view of the rotary cylindrical TEM cell shown in FIG. FIG. 3 shows the rotary cylinder T shown in FIG.
FIG. 4 is a longitudinal sectional view of the EM cell, and FIG. 4 is a side sectional view of the rotary cylindrical TEM cell shown in FIG.

As shown in FIGS. 1 to 4, the rotary cylindrical TEM cell according to the present invention has a cylindrical first outer conductor 5.
A test in which the object to be irradiated is placed, including a first inner conductor 4 which is provided above the inner center of the outer conductor and whose both ends are fixed to the second inner conductor 21 of the coaxial connector connection area 2 and which can rotate. A coaxial connector connection area portion 2 for connecting the area 1 and the coaxial cable to the main body, and for separating and rotating the inner conductor 4 of the test area 1 from the first outer conductor 5
And a tapered region 3 connecting the test region 1 and the coaxial connector connection region 2.

As shown in FIGS. 1 to 4, the test area 1 includes a first inner conductor 4, a first outer conductor 5, a gate 6, and a shielding window 7 for observing the state of an irradiation target. A rotary table 8 provided and on which the irradiation target is fixedly arranged is further formed below the first outer conductor 5. As shown in FIG. 4, by providing the first inner conductor 4 above the inner center of the first outer conductor 5, a uniform field region (see: IEC1000-4-3: 1 between the inner conductor and the outer conductor) / 3 center area). In this region, there is an inversely proportional relationship between the size of the region and the available frequencies. That is, if the size is large, there is a problem that the cutoff frequency becomes low and the soluble frequency becomes low accordingly.

Above the cutoff frequency, the electromagnetic waves (plane waves) in the TEM mode are disturbed.
It is recommended not to use it in various international standards related to electromagnetic wave immunity measurement such as R and EN. Therefore, when the size of the outer conductor is fixed, it is very important to ensure the maximum uniform field area. In addition, since all the structures should be matched to the characteristic impedance (50Ω) of the general coaxial cable, if the position of the first inner conductor is fixed above the inner center point, the width of the inner conductor is determined. Table 1 below shows the result of numerical interpretation on the width of the inner conductor (provided that the thickness of the inner conductor is assumed to be very small) to have a characteristic impedance of 50Ω depending on the position of the inner conductor.
And Table 2. At this time, the following numerical interpretation results show that in the rotary cylindrical TEM cell, the radius of the outer conductor is 1 m, and the minimum distance between the inner conductors is 0.8 at the center point.
Is the result value when Among such data, the results show a very good agreement with the formula results for the specific structure "coaxial cable with the inner conductor located at the center" presented by Bongianni.

[0016]

[Table 1]

[0017]

[Table 2]

Further, the uniformity of the electromagnetic wave from the region to the uniform field region has a very different value depending on at which fulcrum the internal conductor is located. That is, as the inner conductor is farther from the center, as shown in Tables 1 and 2, there is a problem that the inner conductor width is reduced and uniformity is reduced. In the rotary cylindrical TEM cell according to the present invention, a structure having a 50Ω characteristic impedance in which the minimum distance between the center point of the outer conductor 5 and the inner conductor 4 is 0.8 m, and an electric field value of the center point from the inside. As a result of calculation regarding the normalized relative electric field value deviation distribution map and the gradient distribution map, FIG.
As shown in (a) and FIG. 7 (b), it is confirmed that the 6 dB occupied area ratio is 75% and the polarization distribution map is within ± 30 degrees in the uniform field region (square portion shown by the dotted line). I was able to. Therefore, IEC1
It is clear that the structure can be used as a substitute test facility for 000-4-3. In order to provide the structure required by the EN or CISPR (the 6 db occupied area ratio is 100%), the minimum distance between the center point and the internal conductor may be reduced.

On the other hand, when the rotary table 8 provided in the test area 1 in the rotary cylindrical TEM cell of the present invention is examined, as shown in FIG. The plate 9 is fixed so as to arbitrarily adjust the polarization and the incident direction, and only the main body is configured to rotate about the axis of the first bearing 10. It was manufactured so that it was always fixed. Thus, the fact that the irradiation target is fixed has a very close relationship with the reproducibility, accuracy, and measurement time of the measurement. In the present invention, the object to be irradiated is fixed when measuring the electromagnetic wave disturbance and electromagnetic wave resistance, the antenna correction, the antenna pattern, and the like, so that accurate measurement can be performed. The principle and components are described in more detail as follows.

As described above, the rotary table 8 is provided with the illuminated object installation plate 9 made of a non-conductive material such as Teflon so as to be less affected by electromagnetic waves, and the first support rod 1 for supporting the illuminated object installation plate 9.
1, a second support rod 12 for fixing the first support rod 11 again. At this time, the first support rod 11 is manufactured as a non-conductive material so that the influence of electromagnetic waves is small, and the second support rod 12
Is made of a metal such as nickel, iron, copper, brass, aluminum or the like like the inner conductor 4 and the outer conductor 5 in order to reduce leakage of electromagnetic waves. And the second support rod 12
Is equipped with a power supply filter and an object input / output signal filter, and is configured to be fixed to a filter box 13 made of metal.

The filter box 13 is provided with a first receiver 14 for supporting a rotary cylindrical TEM cell body on the ground.
It is manufactured so as to be connected and fixed. After all, the first receiver 14
The irradiation object installation plate 9 on which the irradiation object is provided is formed so as to be connected and fixed to each other. Then, a second receiver 1 separated from the component and connected to a rotatable body.
5 is provided between the first receiver 14 and the second receiver 15 so that the first receiver 14 and the first receiver 14 are separated from each other so that rotation is smooth.
A bearing 10 is provided, and a connecting member 17 in the form of a pipe is provided to be fixed to the main body in order to reduce breakage and leakage of electromagnetic waves when the second support rod 12 separated from the main body rotates.

At the same time, the joint 17 and the second
The receiver 12 is separated so that the second rotation is easy.
A bearing 18 is provided. In addition, a through hole is formed at the center between the first support rod 11 and the second support rod 12 so that twisting of a signal line or a power supply line supplied from the outside is not generated when the main body rotates. The coaxial connector connection area 2 has a function of separating and rotating the first inner conductor 4 from the first outer conductor 5 in addition to a function of connecting the coaxial cable and the TEM cell body. That is, the rotating table 8 performs a function of changing the position of the internal conductor 4 in order to adjust the polarization of the electromagnetic wave, as opposed to performing a function of adjusting the incident direction of the electromagnetic wave. This is because, as shown in FIG. 4, when the inner conductor 4 is rotated around the center of the outer conductor 5, the characteristic impedance is maintained constant without changing the overall structure, and the angle can be changed to any angle. It focuses on the fact that the polarization can be changed.

FIG. 5 shows the rotary cylinder TE shown in FIG.
FIG. 6 is an exploded perspective view of the outer conductor of the coaxial connector connection area 2 relating to the M cell, and FIG.
FIG. 6 is an exploded perspective view of the inner conductor and the dielectric of the coaxial connector connection region 2 with respect to the EM cell, and the structure for rotating the inner conductor 4 as described above will be described with reference to FIGS. First, it is connected to the coaxial connector 33. A part 19 of the second outer conductor 31 is exposed to the outside so that the inner conductor 4 can be driven.

The second outer conductor 31 has a coaxial connector pin 22a and a second inner conductor 21 on the first inner dielectric 22.
The second inner conductor 21 is fixed to the first inner conductor 4 by screws. As a result, the second outer conductor 31 and the first inner conductor 4 are connected to each other, and when the second outer conductor 31 is rotated, the first inner conductor 4 is simultaneously rotated. The third dielectric 23 is inserted and mounted inside the second dielectric 32 so that the second dielectric 32 can be supported and rotated.
The first of the test areas 1 is connected to 5 through the fourth outer conductor 25 of the tapered area 3. At this time, the joint 26 is moved to the second position so that the second outer conductor 31 can be rotated while being supported by such a main body (that is, the first, third, and fourth outer conductors).
It is fixed to the external conductor 31 and the third external conductor 24.

Further, in order to smoothly rotate the second outer conductor 31 and prevent leakage of electromagnetic waves, the third bearing 27 and the fourth bearing 28 are doublely provided with a contact portion between the second outer conductor 31 and the third outer conductor 24. In order to more securely prevent leakage of electromagnetic waves, a ring 29 is provided at the connection portion to increase the amount of capacitive coupling to prevent leakage of electromagnetic waves. At the same time, a safety device 30 is laid on the third outer conductor 24 in order to prevent the first inner conductor 4 from deviating within a certain range of rotation. This is for preventing the phenomenon of hitting the table 8.

On the other hand, the tapered region 3 is
5 is a region tapered in order to maintain the size of the DUT region. For this reason, the length of the electromagnetic wave must be kept as short as possible without causing distortion of the electromagnetic wave. If the length is long, the effective length increases and the resonance frequency decreases. In the present invention, the configuration of the rotary table 8 according to the present invention, in which the traveling direction of the incident wave can be adjusted by rotating the main body without the movement of the irradiated object itself, is different from the rotary cylindrical TEM cell of the present invention. And other TEs such as GTEM cells, TTEM cells, etc.
It is also applicable to M cells.

[0027]

According to the rotary cylindrical TEM cell of the present invention, the inner conductor is provided higher than the center of the outer conductor, and a wider uniform field area can be secured.
The polarization can be arbitrarily adjusted in the range of 100 degrees or more, and the rotation of the inner conductor is configured to be variable by providing a drive shaft outside, so that not only the more accurate angle adjustment is possible,
By providing a rotating table fixed from the inside and providing the irradiation object, if the irradiation object itself is provided, it is possible to adjust all polarization, the incident direction of the electromagnetic wave without movement of the irradiation object itself,
The accuracy and reproducibility of the measurement can be greatly improved as well as the specific time for the electromagnetic wave resistance, the unnecessary electromagnetic wave measurement, the antenna correction, the antenna pattern, etc. can be shortened.

[Brief description of the drawings]

FIG. 1 shows a rotary cylinder T according to a preferred embodiment of the present invention.
It is a schematic perspective view of an EM cell.

FIG. 2 is a cross-sectional view of the rotary cylindrical TEM cell shown in FIG.

FIG. 3 is a longitudinal sectional view of the rotary cylindrical TEM cell shown in FIG.

FIG. 4 is a side sectional view of the rotary cylindrical TEM cell shown in FIG. 1;

FIG. 5 is an exploded perspective view of an outer conductor of a coaxial connector connection region for the rotary cylindrical TEM cell shown in FIG. 1;

FIG. 6 is an exploded perspective view of an inner conductor and a dielectric in a coaxial connector connection area for the rotary cylindrical TEM cell shown in FIG. 1;

7A is a distribution diagram of a relative electric field value deviation normalized with respect to the electric field at the center point in the rotary cylindrical TEM cell according to the present invention, and FIG. 7B is a rotary cylindrical TEM according to the present invention;
FIG. 4 is a gradient distribution diagram of electric field polarization in a cell.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test area 2 Coaxial connector connection area part 3 Tapered area part 4 1st inner conductor 5 1st outer conductor 6 gates 7 Shielding window 8 Rotary table 9 Irradiation object installation board 10 1st bearing 11 1st support rod 12 2nd support Rod 13 Filter box 14 First receiver 15 Second receiver 17 Joint 18 Second bearing 21 Second inner conductor 22 First dielectric 22a Coaxial connector pin 23 Third dielectric 24 Third outer conductor 25 Fourth outer conductor 26 Hand 27 Third bearing 28 Fourth bearing 29 Phosphorus 30 Safety device 31 Second outer conductor 32 Second dielectric 33 Coaxial connector

Claims (7)

[Claims] 1. A first cylindrical outer conductor, and a first rotatable first member provided above the inner center of the outer conductor and fixed at both ends to a second inner conductor of a coaxial connector connection area.
A test area including an inner conductor, on which an object to be irradiated is placed; and a coaxial connector connection area portion for connecting a coaxial cable to the main body and functioning to separate and rotate the first inner conductor of the test area from the first outer conductor; A rotary cylindrical TEM cell comprising the test area and a tapered area connecting the coaxial connector connection area. 2. An irradiation object installation plate on which a test object is provided and fixed, a first support rod for supporting the irradiation object installation plate, and a first support rod provided below the test area. A rotary table composed of a second support bar fixedly supported on the box is further laid, and a filter box in which a power supply filter and an illuminated object input / output signal filter are provided below the rotary table, and a main body connected to the filter box. And a second receiver connected to a rotatable body separated from the component parts.
Receiver, a first receiver provided between the first receiver and the second receiver.
The bearing of claim 1, further comprising a bearing.
A rotary cylindrical TEM cell as described. 3. A connecting part fixed to the main body is provided between the second supporting rod and the main body, and a second bearing is further provided at a connecting portion of the second supporting rod and the connecting part. The rotary cylindrical TEM cell according to claim 2. 4. The rotary cylindrical TEM cell according to claim 2, wherein a through hole is formed at the center of the first support rod and the second support rod. 5. The test area through a second external conductor connected to the coaxial connector and acting as an external drive shaft for driving an internal conductor, and a fourth external conductor in a tapered area portion. A third outer conductor connected to the first outer conductor and coupled to the second outer conductor, and a connector connecting the second outer conductor and the third outer conductor to support the second outer conductor on the main body. And inserted into the second outer conductor through the inner holes of the first and third dielectrics, and connected to one end of the first inner conductor to rotate the first inner conductor by driving the second outer conductor. Second
A coaxial connector pin coupled to one end of the inner conductor and the second inner conductor; a first dielectric and a second dielectric located between the first inner conductor and the outer conductor, a third outer conductor, and a fourth outer conductor , And a third dielectric,
The rotary cylindrical TEM cell according to claim 1, wherein: 6. The connecting portion between the second outer conductor and the third outer conductor, a third bearing and a fourth bearing are doubly provided continuously in series, and a ring is provided at a connecting portion thereof. The rotary cylindrical TEM cell according to claim 5, wherein 7. The rotary type according to claim 5, wherein a safety device for preventing the first outer conductor from deviating from a predetermined range is further attached to the third outer conductor. Cylindrical TEM cell.