JP7368309B2 - Strip line lifting device - Google Patents

Description

The present invention relates to a stripline lifting device capable of lifting and lowering a stripline in an anechoic chamber.

Conventionally, in immunity tests in low frequency bands of 30 MHz or less, unbalanced strip lines have often been used as devices that generate strong electric fields (see, for example, Patent Document 1). In order to prevent interference with external television broadcasts, radio broadcasts, and various other wireless communications (also to avoid violating the Radio Law), we also ensure that the generated electric field strength is uniform. In order to obtain a predetermined performance expected of a stripline, such as performance, the stripline is generally installed in an anechoic chamber equipped with electromagnetic shielding.

JP2013-072786A

However, there is no particular problem if the above-mentioned anechoic chamber is a dedicated anechoic chamber for installing striplines, but if this anechoic chamber is used for other tests, testing using striplines Once this is completed, the stripline must be disassembled, removed, and transported. If at least a portion of the stripline is left inside the anechoic chamber, the components of the stripline will not only physically interfere and become an obstacle when measuring the EMC radiated electric field strength inside the anechoic chamber. This reflects the radio waves and reduces the site attenuation characteristics, which is the performance of the radio anechoic chamber.

Further, the size of the above-mentioned stripline must be determined according to the size of the specimen, and if the specimen is large such as a passenger car, the stripline will have a total length of about 13 m and a width of about 3 m. Among these, the parallel plate part of the stripline is approximately 6m long, approximately 3m wide, and approximately 2.5m in height, making it difficult to carry in and out the stripline components into the anechoic chamber, and to assemble and disassemble them. , it takes a lot of time and effort.

In view of the above-mentioned problems, the present invention aims to suppress the influence on other measurement tests in the anechoic chamber, specifically, the influence on the site attenuation characteristics, which are the radio wave propagation characteristics in the anechoic chamber. To provide a stripline lifting device capable of lifting and lowering a stripline between an installation position and a storage position.

The invention according to claim 1 of the present application provides an input side taper part capable of transmitting an input high frequency current, and a parallel plate part connected to the input side taper part and capable of generating a perpendicular electromagnetic field with a floor surface. a terminal-side tapered part connected to the parallel plate part and capable of transmitting the high-frequency current to the terminal part; and a parallel plate part opening/closing switch provided in the parallel plate part and capable of cutting off the electric wire of the parallel plate part. , the parallel plate part is connected to an elevating device provided on the ceiling of the anechoic chamber, and is configured to be movable up and down between a measurement test position and a storage position in the ceiling part, and the parallel plate part When the flat plate portion is in the measurement test position, the electric wire is connected by the parallel flat plate opening/closing switch, and when the parallel flat plate portion is in the storage position, the electric wire is separated by the parallel flat plate opening/closing switch. This is a strip line lifting device featuring:

In the invention according to claim 2 of the present application, an input side tapered part winding device and a termination side taper are provided at the matching transformer side end part and the terminator side end part of the parallel plate part, respectively, for winding the wire of the input side taper part. 2. The strip line lifting device according to claim 1, further comprising a terminal end side tapered portion winding device for winding up the wire of the strip line.

According to the invention according to claim 1, when the parallel plate part is placed at the measurement test position by the lifting device, the electric wire built in the parallel plate part is opened/closed by the parallel plate part opening/closing switch provided in the parallel plate part. Connected. On the other hand, when the parallel plate part is lifted up by the lifting device and placed in the storage position on the ceiling of the anechoic chamber, the parallel plate part opening/closing switch is configured to disconnect the electric wires built into the parallel plate part. With this configuration, the strip line will not physically interfere with other measurement tests and become an obstacle, and the parallel plate parts will reflect radio waves, improving the performance of the anechoic chamber. It becomes possible to suppress a situation in which the site attenuation characteristic deteriorates.

According to the invention according to claim 2, there is further provided an input side tapered part winding device and a termination side for winding the wire of the input side taper part on the matching transformer side end part and the termination device side end part of the parallel plate part, respectively. A terminal end tapered section winding device is provided to wind up the tapered wire, which greatly reduces the effort required to attach and remove the input tapered section wire and the terminal end tapered section wire when installing and disassembling the strip line. This makes it possible to save labor.

It is an overhead view (a) and a side view (b) of the stripline concerning this embodiment. It is a top view (a) and a side view (b) explaining the measurement point of the electric field intensity of the strip line based on this embodiment. It is a table explaining the specifications of the strip line, etc. according to the present embodiment. FIG. 2 is a diagram illustrating the installation location of the strip resistor according to the present embodiment, in which (a) is an overhead view of the strip resistor installed in the center of the parallel plate part, and (b) is a view of the strip resistor installed at the input side of the parallel plate part. An overhead view is shown. Graphs showing the measurement results of electric field strength, in which (a) shows the measurement results when no strip resistor is installed, and (b) shows the measurement results when the strip resistor is installed at the end of the parallel plate part. Results are shown. Graphs showing the measurement results of electric field strength, in which (a) shows the measurement results when the strip resistor is installed in the center of the parallel plate part, and (b) shows the measurement result when the strip resistor is installed on the input side of the parallel plate part. The measurement results are shown when installed at FIG. 3 is a diagram illustrating how the parallel plate part according to the present embodiment goes up and down in the anechoic chamber, in which (a) is a front view when the parallel plate part is installed, and (b) is a front view when the parallel plate part is stored. It is shown. FIG. 2 is a diagram illustrating how the parallel plate part according to the present embodiment goes up and down in the anechoic chamber, in which (a) is a side view when the parallel plate part is installed, and (b) is a side view when the parallel plate part is stored. It is shown. FIGS. 3A and 3B are diagrams illustrating the operation mode of the parallel plate opening/closing switch according to the present embodiment, in which (a) and (b) are a front view and a side view of the flat plate opening/closing switch when the parallel plate part is stored, and (c) ) and (d) show a front view and a side view of the flat plate opening/closing switch when the parallel flat plate part is installed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the strip line of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overhead view (a) and a side view (b) of a stripline 100 according to the present embodiment. The illustrated stripline 100 is an unbalanced stripline for electromagnetic field irradiation, in which five line sections 1 are installed between a matching transformer 20 and a terminator 30, and can be used for immunity measurement. It is 100.

Further, on the input side of the strip line 100 of this embodiment, high frequency power is supplied to the matching transformer 20 from a high frequency power amplifier (not shown), and the output impedance of the high frequency power amplifier and the characteristic impedance of the strip line 100 are matched. . An input side taper part 10 is formed in each line part 1 of the stripline 100, and the matching transformer 20 and the parallel plate part 11 are connected smoothly without any steps, and the width of the test area is maintained without any change in characteristic impedance. is ensured.

The parallel plate portion 11 generates a perpendicular electromagnetic field between it and the metal surface of the floor, and its terminal end side is connected to the terminal end tapered portion 12 via a strip resistor 13. Similar to the above-described input side taper section 10, the termination side taper section 12 guides high frequency current without reflection and is connected to the terminator 30. Note that, as shown in the bird's-eye view of FIG. 2A and the side view of FIG. The installation range of the section 11 has a length (L2) of approximately 6.0 m, a width (W) of approximately 3.0 m, and a height (h) of 2.5 m. The length (L3) of the terminal end taper portion 12 is approximately 3.5 m, similar to the input taper portion 10. Therefore, the test area formed by the strip line 100 of this embodiment is large enough to accommodate a 5 m x 2 m car.

Furthermore, the strip line 100 of the present invention has a strip resistor 13 provided on the parallel plate portion 11, and such a configuration can suppress deviations in electric field strength within the test area. Therefore, in order to verify the suppression effect, an electric field strength meter was installed at a height of 1 m from the floor at each measurement point P1 to P18 in the test area, as shown in Figures 2(a) and (b). The electric field strength at each measurement point was measured by inputting approximately 9.5 kW of power to the input side. Note that the specifications of each member including the strip line and each device used in the actual measurements are as shown in the table of FIG. 3. Further, the resistance value of the strip resistor 13 used in this embodiment is 260Ω.

FIG. 5(a) shows the measurement results of a conventional strip line in which the strip resistor 13 is not provided on the parallel plate portion 11. Note that the thick broken line indicates the range of 3 dB deviation, and the thin solid line indicates the electric field strength at each measurement point. Looking at the results shown in the figure, it can be seen that the deviation increases by more than 3 dB as the frequency increases from around 7 MHz, and furthermore, the generated electric field strength at each measurement point in the test region changes drastically from around 10 MHz. Also, overall, the maximum deviation between 10 kHz and 20 MHz is 7.6 dB, and the maximum deviation between 20 MHz and 30 MHz is increased to 9.8 dB.

On the other hand, FIG. 5(b) shows the measurement results using the strip line 100 in which the strip resistor 13 is provided on the parallel plate portion 11, and the deviation of each measurement point is suppressed to within 3 dB up to around 17 MHz. Also, overall, the maximum deviation between 10 kHz and 20 MHz is 5 dB, and the maximum deviation between 20 MHz and 30 MHz is 7 dB. That is, compared to the conventional strip line in which the strip resistor 13 is not provided in the parallel plate portion 11 shown in FIG. By providing the device 13, it is possible to attenuate the reflected waves and significantly improve the uniformity of the electric field strength in the test area.

Note that the measurement results shown in FIG. 5(b) described above are the results of measurements using the strip line 100 in which the strip resistor 13 is provided on the terminal end side of the parallel plate portion 11, but the bird's-eye view of FIG. 4(a) As shown in FIG. 4B, there is a strip line 100 in which a strip resistor 13 is provided at the center of the parallel plate section 11, and as shown in the overhead view of FIG. Regarding the strip line 100 provided with the strip line 13, the electric field strength was similarly measured. The measurement results are shown in FIGS. 6(a) and 6(b).

Looking at the measurement results shown in FIGS. 6(a) and 6(b), the measurement results for a conventional strip line without the strip resistor 13 (FIG. 5( It can be seen that there is no large change in the electric field strength up to around 15 MHz compared to (see a)). From this, the stripline 100 of the present invention, which includes the strip resistor 13 in the parallel plate portion 11, can significantly improve the uniformity of the electric field strength in the test area compared to the conventional stripline. .

In addition, when considering the installation position of the strip resistor 13 in the parallel plate part 11 from the measurement results of the strip line 100 shown in FIGS. 5(b), 6(a), and (b), the deviation at each measurement point is It is recognized that it is more preferable to provide the strip resistor 13 on the terminal end side of the parallel flat plate portion 11 in that it is possible to suppress the difference to a smaller value.

(Other embodiments)
Although one embodiment of the stripline 100 of the present invention has been described above, the present invention is not limited to the above-described embodiment, and the following changes can be made.

For example, the dimensions and shape of the strip line 100, the members used, and the specifications of each device in the embodiment described above are merely examples, and are not necessarily limited to these, and may be changed. .

Furthermore, in the above-described embodiment, the specifications for the strip resistor 13 are not necessarily limited to a specific material or resistance value, but a resistor with an optimal resistance value is applied by performing necessary simulations. It is possible to do so. Note that a non-inductive resistor can be suitably used.

(Strip line lifting device)
As shown in the previous embodiments, the stripline 100 also increases in size depending on the amount of spatial space of the required test area. Normally, such a stripline 100 is installed in the anechoic chamber 50 and used for measurement tests, but since it affects other measurement tests inside the anechoic chamber 50, it is necessary to It is necessary to bring the materials and equipment into the darkroom 50 and assemble the stripline 100, and after the measurement test, it must be disassembled and removed and carried out of the anechoic chamber 50, which requires a great deal of time and effort.

As a means to save the above-mentioned labor, a lifting device 40 is provided in the ceiling of the anechoic chamber 50, and when the stripline 100 is not in use, the parallel plate portion 11 of the stripline 100 is lifted up and stored in the ceiling. It can be configured as follows. According to such a configuration, it is possible to suppress the influence on other measurement tests in the anechoic chamber 50, specifically, the influence on the site attenuation characteristics, which are radio wave propagation characteristics in the anechoic chamber.

To explain in more detail, as shown in FIGS. 7 and 8, a lifting device 40 is provided on the ceiling of the anechoic chamber 50, and a lifting winch 41 provided in the lifting device 40 lifts the parallel plate portion of the strip line 100. 11 can be raised and lowered between the installation position and the storage position. Note that FIGS. 7(a) and 8(a) illustrate installation modes in a front view and a side view when the parallel plate portion 11 is lowered to a predetermined installation position and the strip line 100 is installed. On the other hand, FIGS. 7(b) and 8(b) show a front view and a side view, respectively, of a mode in which the parallel flat plate part 11 is raised and housed between the radio wave absorbers 51 in the ceiling part. .

By making it possible to install and store the parallel flat plate portion 11 in this manner, a series of operations from carrying in and assembling the strip line 100 to assembly, disassembly/removal, and carrying out the materials and equipment can be greatly reduced in labor. becomes possible. Moreover, the parallel plate part 11 when stored is stored on the back side of the radio wave absorber 51, as shown in FIGS. 7(b) and 8(b). Therefore, in other measurement tests in the anechoic chamber 50, the strip line 100 does not physically interfere and become an obstacle, and furthermore, the parallel plate portion 11 etc. reflect the radio waves, achieving the performance of the anechoic chamber. It becomes possible to suppress a situation where site attenuation characteristics deteriorate.

Furthermore, as shown in FIGS. 7(a) and 8(a), five input-side tapered portion winding devices 42 are provided at the end of the parallel plate portion 11 on the matching transformer side. , five terminal side tapered portion winding devices 43 are also provided at the terminal device side end portion. As a result, when storing the parallel plate portion 11 as shown in FIGS. 7(b) and 8(b), the input side tapered portion winding device 42 and the terminal end side tapered portion winding device 43 The wire forming the tapered portion 10 and the end-side tapered portion 12 is wound up.

In this embodiment, spring motors are used as the input side tapered portion winding device 42 and the end side tapered portion winding device 43. That is, the drum is rotated by a spring motor, and the wires forming the input side taper part 10 and the terminal side taper part 12 are wound up. With this configuration, in addition to the parallel plate part 11, the input side taper part 10 and the end side taper part 12 can also be stored in the ceiling of the anechoic chamber 50, and the process from installation to removal of the strip line 100 can be easily accommodated. It becomes possible to significantly save labor and labor.

Note that the input side tapered portion winding device 42 and the end side tapered portion winding device 43 described above are not necessarily limited to those using the spring motor described above, and may wind the wire using an electric motor or manual winding. It is also possible to apply such a device. However, from the viewpoint of influence on other measurement tests, installation time, and ease of handling, it is more preferable to use the spring motor.

In addition, in order to further suppress the influence of the parallel plate part 11 housed in the ceiling of the anechoic chamber 50 on other measurement tests, some of the electric wires 112 inside the parallel plate part 11 are electrically It is possible to provide a parallel plate opening/closing switch 60 that can be insulated.

FIG. 9 shows an example of the installation mode of the parallel plate part opening/closing switch 60, and FIGS. 9(a) and 9(b) show the parallel plate part 11 when it is installed in the ceiling The installation mode and operation mode of the flat plate part opening/closing switch 60 are illustrated, and FIGS. 9(c) and (d) show the parallel plate part opening/closing switch when the parallel plate part 11 is installed in the installation position at the time of the measurement test. The installation and operation of 60 is illustrated.

As shown in the figure, a limit switch 61 is attached to the FRP 111 near the center of the parallel plate portion 11 using an angle and a U bolt, and one side of the limit switch 61 is provided with a flexible bar 63. The tip side of the flexible bar 63 is connected to the ceiling via a rope 65. Further, the electric wire 112 inside the FRP 111 is connected to the limit switch 61, and when the parallel plate part is stored as shown in FIGS. It becomes insulated.

On the other hand, when the parallel plate part 11 is lowered to the installation position by the lifting winch 41 of the lifting device 40, the flexible bar is moved by the rope 65 connected to the ceiling as shown in FIGS. 63 is pulled upward as shown, and the limit switch 61 is closed. As a result, the left and right electric wires 112 are electrically connected across the limit switch 61, and a measurement test using the strip line 100 becomes possible. Further, in this embodiment, as shown in FIG. 9, a flexible metal fitting 64 is provided that can adjust the length of the rope 65. Thereby, it is possible to easily adjust the length of the rope 65 according to the installation height of the parallel plate portion 11.

That is, the above-described limit switch 61 connects the electric wires 112 forming the parallel plate section 11 during a measurement test using the strip line 100, and disconnects the electric wires 112 forming the parallel plate section 11 when storing the strip line 100 after the measurement test. With this configuration, it becomes possible to more effectively suppress the deterioration of the site attenuation characteristics during storage, and it becomes possible to suppress the influence on other measurement tests performed in the anechoic chamber 50.

Although the embodiments and some modified examples of the present invention have been described above, these explanations are for the purpose of facilitating understanding of the present invention and are not intended to limit the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention includes equivalents thereof. In addition, it is possible to combine or omit each component described in the claims and the specification to the extent that at least part of the above-mentioned problems can be solved or at least part of the effect can be achieved. .

1 Line part 10 Input side taper part 11 Parallel flat plate part 12 End side taper part 13 Strip resistor 20 Matching transformer 30 Terminator 40 Lifting device 41 Lifting winch 42 Input side taper part winding device 43 Terminating side taper part winding device 50 Radio wave anechoic chamber 51 Radio wave absorber 60 Parallel flat plate opening/closing switch 61 Limit switch 63 Flexible bar 64 Flexible fitting 65 Rope 100 Strip line 111 FRP
112 Electric wire

Claims (2)

an input side taper part capable of transmitting an input high frequency current; a parallel plate part connected to the input side taper part and capable of generating a vertical electromagnetic field between the floor surface; and a parallel plate part connected to the parallel plate part. a terminal-side tapered part capable of transmitting the high-frequency current to the terminal part, and a parallel plate part opening/closing switch provided in the parallel plate part and capable of cutting the electric wire of the parallel plate part,
The parallel plate part is connected to a lifting device provided on the ceiling of the anechoic chamber, and is configured to be able to be raised and lowered between a measurement test position and a storage position in the ceiling,
When the parallel plate part is in the measurement test position, the electric wire is connected by the parallel plate part opening/closing switch,
A strip line lifting device characterized in that when the parallel flat plate portion is in the storage position, the electric wire is separated by the parallel flat plate opening/closing switch. An input side taper section winding device for winding the wire of the input side taper section and a terminal side taper section for winding the wire of the termination side taper section are respectively provided at the matching transformer side end part and the terminator side end part of the parallel plate part. The stripline lifting device according to claim 1, further comprising a winding device.