JPH04353774A - Tem cell - Google Patents

Abstract

PURPOSE:To obtain a TEM cell which generates inside a uniform TEM mode electromagnetic wave being simular to the one of a distant field. CONSTITUTION:A cell 1 constituting an external electrode is provided, and an internal electrode plate which is supported at the upper and lower end parts by support members 7 and 7' provided in the vertical direction and stands upright in the vertical direction is provided inside the cell. The internal electrode plate 5 is provided in displacement from the central position of the cell in regard to the direction being orthogonal to the surface of the plate, and the cell 1 constituting the external electrode has doors 4 on the opposite sides of the internal electrode plate 5. In this way, a TEM cell showing little deflection, in particular, is constructed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a TEM cell.
In particular, the present invention relates to a TEM cell that generates a uniform TEM mode electromagnetic wave similar to a far-field electromagnetic field therein.

0002

2. Description of the Related Art A conventional example of the present invention will be explained with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a conventional example of a TEM cell.
FIG. 2 is a sectional view thereof. A TEM cell is a device that generates a uniform TEM mode electromagnetic field similar to a far-field electromagnetic field, and can measure the anti-jamming characteristics of electronic devices or measure the radiation components of electronic devices within that field. It is used for various radio wave measurements and radio wave experiments.

In FIGS. 1 and 2, the entire cell 1 is made of a conductive plate, and in the figure, a square pyramid part 2 on the left side, a square pyramid part 2' on the right side, and a square cross-section cylindrical part 3 in the center are connected to each other. The engaging portion is integrally constructed by welding or other suitable fixing means. The cell 1 made of a conductive plate also constitutes an external electrode. Reference numeral 4 denotes a door formed on the vertical surface of the square tube portion 3, through which electronic devices to be measured and experiments are taken in and taken out. Reference numeral 5 denotes an internal electrode plate that forms a uniform TEM mode electromagnetic field between the cell 1 and the external electrode. Mechanically, the internal electrode plate 5 is held horizontally by a support member provided in a direction perpendicular to the internal electrode plate 5. Electrically, the internal electrode plate 5 is connected to a high frequency signal source SG by leading out its narrowed ends through a connector 6.
Or connected to a coaxial terminator. The internal electrode plate 5 is maintained at a distance between it and the external electrode cell 1 such that the impedance is 50Ω.

As a TEM cell, there is also a G-TEM cell 1' as shown in FIG.

[0005]

The conventional example of the TEM cell 1 described above has the following drawbacks and problems. a. The internal electrode plate 5 is thin and has a large area, and since it is configured to lie flat, it is easily bent, making it difficult to maintain a constant electrical impedance.

[0006] b. In order to reduce the deflection, it may be sufficient to increase the number of support members, but since the support members are provided in a direction perpendicular to the internal electrode plate 5, this is difficult to achieve inside the cell. This method has a greater influence on the electromagnetic field generated by the support member, and it is not preferable to increase the number of support members. c. As described above, the internal electrode plate 5 has both narrowed ends led out through the connector 6. Mechanical stress due to bending is likely to be applied to the connection between the both ends and the connector 6, and this connection is likely to be damaged.

d. In this type of TEM cell, FIG.
As shown in FIG. 2, the internal electrode plate 5 may be displaced above the center of the cell in the vertical direction to enlarge the area for testing and measurement. However, in this case, the upper region where the electromagnetic field is stronger is difficult to use due to mechanical and strength reasons of the cell and is therefore uneconomical. The present invention aims to provide a TEM cell in which the above-mentioned drawbacks and problems are solved or eliminated.

[0008]

[Means for Solving the Problems] A cell forming an external electrode is provided, and an internal electrode plate is provided inside the cell to stand upright in the vertical direction and supported by support members provided in the vertical direction at the upper and lower ends, The internal electrode plate is provided displaced from the center position of the cell in the direction perpendicular to the plate surface, and the cells constituting the external electrode are provided with doors on both sides of the internal electrode plate, so that the above a. All of the shortcomings and problems of d to d have been resolved.

[0009]

Embodiment An embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 and 5, the same reference numerals as those shown in FIGS. 1 and 2 indicate the same members. In the TEM cell 1 of this invention, the internal electrode plate 5
support members 7, 7 provided in the vertical direction at the upper and lower ends thereof.
It is supported by ' and is made to stand upright in the vertical direction. As shown in FIG. 5, the internal electrode plate 5 is provided displaced from the center position of the cell in a direction perpendicular to the plate surface. In this way, the cell 1 constituting the external electrode constitutes an area on both sides between the cell 1 and the internal electrode plate 5 for measuring the anti-jamming characteristics of the electronic device or measuring the radiation component of the electronic device. Reference numeral 4 denotes a door similar to the door in the conventional example, which is formed on the vertical surface of the square cylindrical part 3, through which the electronic equipment to be measured and experiment is taken in and out. is provided with the doors 4 on both sides of the internal electrode plate 5, respectively.

The present invention can also be implemented as shown in FIGS. 6 and 7, in which the long sides of the internal electrode plates 5 are erected.

[0011]

Effects of the Invention The present invention is as described above, and although the internal electrode plate 5 is thin and has a large area, it is supported from below by the lower support member 7, and the inner electrode plate 5 is supported from below by the lower support member 7. Since it is supported by the square tube part 3 from above via the member 7', it does not bend.

The supporting members 7, 7' can be installed at the upper and lower ends of the internal electrode plate 5, where the influence on the electromagnetic field is minimal. The internal electrode plate 5 is provided displaced from the center position of the cell 1 in the direction perpendicular to the plate surface, and has two regions with different volumes on both sides, left and right, respectively. By providing the door 4, the large area and the small area, which is smaller in volume but has a stronger electromagnetic field, can be used depending on the purpose, which is economical.

The connection between the tapered ends of the internal electrode plate 5 and the connector 6 is made at a location different from where the electromagnetic field is generated, and at a location directly related to the support of the electrode plate. Therefore, without giving special consideration to the adverse effects on the electromagnetic field and the support of the internal electrode plate 5, it is possible to carry out the process while paying attention only to the alignment and strength inside and outside the cell and fully satisfying these requirements.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional example of a TEM cell.

FIG. 2 is a diagram showing a cross section of a conventional example of the TEM cell shown in FIG. 1;

FIG. 3 is a perspective view of a conventional example of a G-TEM cell.

FIG. 4 is a perspective view of a TEM cell of the present invention.

FIG. 5 is a cross-sectional view of the TEM cell of the invention shown in FIG. 4;

FIG. 6 is a perspective view of another embodiment of the TEM cell of the present invention.

FIG. 7 is a perspective view of a G-TEM cell of the present invention.

[Explanation of symbols]

1 Cells 2 and 2' forming external electrodes
Square pyramid part 3 Square tube part 4 Door 5 Internal electrode plate 6 Connector 7, 7' Support member

Claims (1)

[Claims] 1. A cell that constitutes an external electrode is provided, and an internal electrode plate that stands upright in the vertical direction and is supported by support members provided in the vertical direction at the upper and lower ends is provided inside the cell,
The internal electrode plate is provided displaced from the center position of the cell in the direction perpendicular to the plate surface, and the cells constituting the external electrode are provided with doors on both sides of the internal electrode plate. Features of TEM cell.