WO2007049715A1 - 妨害排除能力試験装置 - Google Patents
妨害排除能力試験装置 Download PDFInfo
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- WO2007049715A1 WO2007049715A1 PCT/JP2006/321408 JP2006321408W WO2007049715A1 WO 2007049715 A1 WO2007049715 A1 WO 2007049715A1 JP 2006321408 W JP2006321408 W JP 2006321408W WO 2007049715 A1 WO2007049715 A1 WO 2007049715A1
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- waveguide
- electromagnetic
- electromagnetic horn
- horn
- test
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0821—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning rooms and test sites therefor, e.g. anechoic chambers, open field sites or TEM cells
Definitions
- the present invention relates to a disturbance rejection capability test device for testing a disturbance rejection capability (also referred to as immunity) of an electronic device.
- a test equipment to be tested is placed on a turntable standing on one end of an anechoic chamber, and an antenna is installed on an antenna support column standing on the other end. Have And it is comprised so that the electromagnetic waves radiated
- a test equipment is placed in an anechoic chamber, and electromagnetic waves of horizontal or vertical polarization are output from a nocical antenna or logarithmic periodic antenna fixed in the same anechoic chamber.
- electromagnetic waves of horizontal or vertical polarization are output from a nocical antenna or logarithmic periodic antenna fixed in the same anechoic chamber.
- radiated electromagnetic field test method applied to the EUT the TEM waveguide method using a TEM cell, GTEM cell, etc.
- there is also a method of applying a rotating electromagnetic field to the EUT for example, (See Patent Document 2).
- Patent Document 1 Japanese Patent Laid-Open No. 7-55863
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-98211
- the electric field strength of the test radio wave radiated by the antenna force was set to a relatively low 200VZm, so depending on the usage status of the product to be tested (test equipment) May not be able to conduct a sufficient immutability test o
- the present invention has been made in view of these problems, and an object of the present invention is to provide an interference rejection capability test apparatus that can be used with a low-cost, low-output power amplifying apparatus.
- the invention described in claim 1 made to achieve such an object is used to test the interference rejection capability of the EUT by radiating electromagnetic waves toward the EUT.
- the radiation antenna includes an electromagnetic horn and a wave guide plate that guides electromagnetic waves radiated from the electromagnetic horn to the EUT.
- the interference exclusion capability testing apparatus of the present invention includes the waveguide plate that guides the electromagnetic wave radiated from the electromagnetic horn to the EUT, so that the electromagnetic wave such as the electromagnetic horn force is tested. Efficiently radiates to the equipment, electromagnetic horn force Reduces the loss of electromagnetic waves generated in the radiation path from the electromagnetic horn to the EUT compared to simply radiating electromagnetic waves be able to.
- the interference exclusion capability testing apparatus of the present invention when a high-frequency signal for transmission is input to an electromagnetic horn, the power amplifying apparatus is reduced so that it is not necessary to use a high-output power amplifying apparatus. By using it as an output, it is possible to reduce the size and cost of the interference rejection capability testing device.
- one waveguide plate is effective, more preferably, as described in claim 2, a plurality of waveguide plates are connected to the electromagnetic horn force EUT. It is desirable to place it so as to surround a part of
- the waveguide plate is configured by a waveguide, and the waveguide is an electromagnetic horn. If it is placed between the tester and the EUT, the loss of electromagnetic waves generated in the radiation path from the electromagnetic horn to the EUT can be reduced more effectively, and the above-mentioned effects can be further exerted. can do. In this case, it is desirable that the waveguide be arranged so that its central axis is on the same axis as the radiation axis of the electromagnetic horn.
- the waveguide plate is constituted by a waveguide, as described in claim 4, if each end face is arranged so as to be in close contact, the radiation is radiated from the radiation antenna. Electromagnetic waves can be efficiently radiated to the EUT, and it is possible to provide an interference rejection capability testing device with little power loss.
- the electromagnetic horn and the waveguide do not necessarily have to be arranged with their end faces in close contact with each other.
- the electromagnetic horn and the waveguide are arranged with a space therebetween, the electromagnetic horn and the waveguide are brought into close contact with each other by adjusting the distance, the axial length of the waveguide, and the like. Therefore, if the gap between the electromagnetic horn and the waveguide is set appropriately according to the test conditions, the gap between the electromagnetic horn and the waveguide is increased. Can be arranged.
- the length of the waveguide in the axial direction is approximately half the distance to the EUT's opening end surface force specified by the test conditions (specifically, the distance of 1Z2 of 0.8).
- the distance between the electromagnetic horn and the waveguide is approximately equal to the wavelength of the electromagnetic wave (specifically, 0.8 times to 1.2 times the wavelength). Length) is desirable.
- the interval between the electromagnetic horn and the waveguide is adjusted appropriately.
- the support member may only be provided with a wheel so that it can move, but more preferably, as described in claim 8, the support member moves on the slide rail. It is good to comprise from the several support stand provided as possible. In other words, in this way, the waveguide can be moved relative to the electromagnetic horn while the central axes of the electromagnetic horn and the waveguide are aligned with each other. Axis misalignment can be prevented.
- the electromagnetic horn is a rotating hand for rotating about the radiation axis of the electromagnetic horn.
- a step may be provided. In other words, in this way, the polarization plane of the electromagnetic wave radiated to the EUT can be set at an arbitrary angle.
- the electromagnetic horn radiates electromagnetic waves in front of its opening surface force, but part of the electromagnetic waves radiated from the electromagnetic horn head wraps backward from the opening surface of the electromagnetic horn. Sometimes. For this reason, as described in claim 10, if a reflection plate is provided around the electromagnetic horn to reflect the electromagnetic wave that circulates backward from the opening surface thereof and guides it to the EUT, the electromagnetic horn force, etc. Electromagnetic waves can be radiated to the EUT more efficiently.
- FIG. 1 is an explanatory diagram of an interference exclusion capability testing apparatus to which the present invention is applied.
- FIG. 2 is an explanatory diagram of a radiating antenna.
- FIG. 3 is an explanatory view showing a different embodiment of the present invention.
- FIG. 4 is an explanatory view showing different embodiments of the radiating antenna.
- FIG. 5 (a) to (c) are explanatory diagrams showing the test conditions of Experiment 1 and the experimental results.
- FIG. 7] (a) to (c) are explanatory diagrams showing the test conditions of Experiment 2 and the experimental results.
- FIG. 8 is a graph showing the experimental results of (a) and (b) Experiment 2.
- FIG. 9 (a) to (c) are explanatory views showing an embodiment in which the interval between the electromagnetic horn and the waveguide can be adjusted.
- FIG. 10 is an explanatory diagram showing an embodiment in which the polarization plane of electromagnetic waves can be adjusted.
- FIG. 11 is an end view taken along the line AA in FIG.
- FIG. 12 is an explanatory diagram for explaining a measurement method of the distance measuring device.
- FIGS. 13A to 13C are explanatory diagrams illustrating other configuration examples of the waveguide.
- FIG. 14 is an explanatory diagram for explaining another example of the test condition of the immunity test.
- FIG. 15 is an explanatory diagram for explaining a change in received electric field strength depending on the length of the electromagnetic horn.
- FIG. 1 shows an explanatory diagram of an interference rejection capability testing apparatus to which the present invention is applied!
- 1 is an interference immunity testing device, and an electromagnetic wave absorber 11 is attached to the entire surface of the anechoic chamber 7 and reflected by electromagnetic waves radiated into the anechoic chamber and the EUT.
- the electromagnetic wave is absorbed by the radio wave absorber 11 and converted into thermal energy.
- a table 3 is provided on one end side.
- the EUT 2 is placed on the height adjustment jig 3a.
- a radiation antenna 5 is provided via a gantry 6a and a gantry 6b.
- the radiating antenna 5 is composed of an electromagnetic horn 4 and a waveguide 8, and the waveguide 8 and the test equipment 2 are arranged on the radiation axis 12 of the electromagnetic horn 4.
- 17a is a feed line for connecting a circulator 14 and a radiating antenna 5 (more specifically, an electromagnetic horn 4) to be described later.
- Reference numeral 20 denotes a transmitter.
- L1 represents the length of the waveguide 8, which is set to 50 cm, for example, in this embodiment.
- L 2 is the spatial distance of the open end force of the waveguide 8 to the EUT 2 and is set to 50 cm, for example, in this embodiment.
- LO is the distance from the open end of the electromagnetic horn 4 to the EUT, and is set to lm in this embodiment.
- the radiating antenna 5 comprises an electromagnetic horn 4 and a waveguide 8, and the electromagnetic horn 4 is a rectangular electromagnetic horn with one open.
- a probe 40 is disposed between the holding body 41 and the connector 42.
- the connector 42 is connected to the feeder line 17a.
- the holding body 41 is made of a dielectric material.
- a rectangular waveguide formed so that the opening of the waveguide 8 has the same shape as the opening of the electromagnetic horn 4 is used. Then, the radiation axis 12 of the electromagnetic wave radiated from the electromagnetic horn 4 and the central axis of the waveguide 8 are arranged so as to coincide with each other, and both end faces thereof are brought into close contact with each other.
- the waveguide 8 may be formed of a conductive material, but may be formed of a fiber woven with a conductive material, and may have an interval shorter than a quarter of its wavelength at the frequency used. If it is a gap, it may be formed in a mesh shape. Thus, if it forms in fiber or mesh shape, the light weight of a waveguide will be attained.
- a rectangular electromagnetic horn and a rectangular waveguide are used, but a circular electromagnetic horn and a circular waveguide may be used.
- the transmission device 20 includes a signal generator 10, a power amplification device 13, a circulator 14, and a dummy resistor 18.
- 10 is a signal generator, and in this embodiment, an oscillator that sweeps from 1 to 1.5 GHz is used.
- 13 is a power amplifier.
- the circulator 14 and the dummy resistor Although the anti-device 18 was used, an isolator may be used instead.
- the 1 to 1.5 GHz sweep signal generated by the signal generator 10 is amplified by the power amplifier 13 (50 W is used in this embodiment).
- the amplified high frequency signal is supplied to the electromagnetic horn 4 via the circulator 14.
- the electromagnetic waves radiated from the four electromagnetic horns through the probe 40 are transmitted through the waveguide 8 with little transmission loss and radiated to the EUT 2.
- the waveguides 8 having the same shape as the openings of the electromagnetic horn 4 are arranged so as to be in close contact with each other, the electromagnetic waves radiated from the electromagnetic horn 4 can be efficiently and efficiently lost without any loss. Can lead to.
- the electromagnetic wave guided to the waveguide 8 is radiated from the other end face of the waveguide 8 to the EUT 2. Then, a uniform electromagnetic field is generated on the test plane of the table 3 on which the EUT 2 is placed ( ⁇ 30 cm in this embodiment).
- the height adjusting jig 3a may be changed.
- the electromagnetic waves can be emitted to the test plane.
- the circulator 14 receives the electromagnetic wave radiated from the radiating antenna 5 at the radiating antenna 5 after being reflected by the metal part of the test equipment, and is applied to the power amplifying device 13 by the received power. This is to prevent the power amplifying device 13 from malfunctioning or malfunctioning.
- Received electric field strength 8 20 1 ⁇ 0 8 (600 10 6 )
- Power Pi Et— 20XLog (0.001X ⁇ 50X10 6 )
- the end face force of the electromagnetic horn 4 is ldB, the loss G2 of the waveguide 8 is ldB, and the waveguide 8 If the loss G3 from the other end face to the test plane is 5 dB, the power P supplied from the electromagnetic horn 4 is
- the loss from the open end of the waveguide 8 to the test plane G3 was 5dB.
- the force becomes 28.7 dB.
- the loss was found to be significantly reduced (23.7 dB). The reason for this is that most of the electromagnetic wave energy radiated from the open end force of the waveguide 8 is converged and radiated in the test space on the table 3 on which the EUT 2 is placed. it is conceivable that.
- Supply power Pf when radiating into free space is obtained by the following equation.
- the disturbance exclusion capability test apparatus of the present embodiment it is 1/600 compared to the conventional case where electromagnetic waves are directly radiated to the test equipment such as the radiation antenna force. It can be seen that the required performance can be obtained with moderate power supply.
- the electromagnetic wave radiated from the electromagnetic horn 4 is guided to the waveguide 8, so that the loss in the propagation path (in the present embodiment, the end face of the electromagnetic horn 4).
- the loss G1 to one end face of the waveguide 8 is 1 dB
- the loss G2 of the waveguide 8 is 1 dB
- the end face force of the other end of the waveguide 8 is also the loss G3 to the test plane, and the total loss is 5 dB.
- the force in the propagation path is smaller than the conventional method of radiating in free air (the transmission distance between transmission and reception lm, frequency 1.3 GHz free space propagation loss GO is 34.7 dB) As a result, the power supplied to the antenna can be reduced to about 1/600.
- the circulator 14 since the circulator 14 is provided on the input side of the electromagnetic horn 4, the electromagnetic wave reflected and returned by the metal part of the EUT 2 is returned from the output terminal of the amplifier 13. It is possible to prevent malfunction or failure of the amplifier 13 due to application.
- an interference immunity testing apparatus 100 is a small radio anechoic device having an opening on the wall surface and having a shorter length in the direction of electromagnetic wave radiation, instead of the radio anechoic chamber 7 of the first embodiment. Room 70 is used.
- the electromagnetic horn 4 and the gantry 6a on which the electromagnetic horn 4 is placed are installed outside the anechoic chamber 70.
- the opening of the electromagnetic horn 4 is protruded into the inside of the anechoic chamber 70 from the opening provided on the wall surface of the anechoic chamber 70.
- the waveguide 8 is disposed so as to be in contact with the projecting opening of the electromagnetic horn 4.
- the difference between the first embodiment and this embodiment is that the electromagnetic horn 4 and the waveguide 8 constituting the radiating antenna 50 are arranged between their end faces. Are spaced apart by a distance La, and the electromagnetic horns 4 are reflected from the upper and lower outer circumferential surfaces of the electromagnetic horn 4 to reflect them back to the EUT.
- the board 44 is provided.
- the interval that is, the distance La between the antenna and the waveguide
- the axial length of the waveguide 8 are set.
- the electromagnetic horn 4 and the waveguide 8 that can reduce the power loss most under the test conditions that the opening end face force of the electromagnetic horn 4 is lm to the EUT and the frequency of the electromagnetic wave is 1.3 GHz.
- the electromagnetic wave without the reflector 44 as shown in FIG.
- the horn 4 and the waveguide 8 are arranged on the radiation axis of the electromagnetic horn 4 with a space La, and further on the radiation axis of the electromagnetic horn 4 at a position away from the opening end face of the electromagnetic horn 4 by lm (lOOcm).
- An electric field probe for measuring the received electric field strength was arranged.
- the height of the radiation axis of the electromagnetic horn 4 and the floor force of the electromagnetic probe were set to 100 cm, in accordance with the specific test conditions that actually exist in the immunity test.
- the metal plate was placed horizontally at a position 15 cm below the electric field probe.
- the metal plate was projected 10 cm closer to the waveguide 8 than the electric field probe.
- an axial length Lb of 25cm, 50cm, 75cm is used, and by moving the waveguide 8 on the radial axis, the opening of the electromagnetic horn 4 is opened.
- the distance from the end face to the opening end face of the waveguide 8 (distance between the antenna and the waveguide) La was measured, and the received electric field strength obtained with the electric field probe was measured.
- this measurement result is a measurement result when the frequency f of the electromagnetic wave that also radiates the electromagnetic horn 4 force is set to 1.3 GHz.
- the transmission loss of electromagnetic waves can be minimized when the length Lb of the waveguide 8 is 50 cm.
- the distance La between the antenna and the waveguide is about 25 cm, and the length Lb of the waveguide 8 It was found that the distance La between the antennas and the waveguide that can minimize the transmission loss of electromagnetic waves is about 45 cm.
- the electromagnetic force of the electromagnetic horn 4 and the electromagnetic horn 4 that can reduce the power loss under the test conditions of l.lm to the EUT and the frequency of the electromagnetic wave 2.9GHz are the same.
- a reflector 44 as shown in FIG. 7 (a) is provided in order to obtain the distance from the waveguide 8 (the antenna-waveguide distance La) and the axial length Lb of the waveguide 8.
- the electromagnetic horn 4 and the waveguide 8 that are not disposed are arranged on the radiation axis of the electromagnetic horn 4 with a gap La, and further, 1.lm (from the opening end face of the electromagnetic horn 4 on the radiation axis of the electromagnetic horn 4.
- An electric field probe for measuring the received electric field strength was disposed at a position 110 cm away.
- the height of the radiation axis of the electromagnetic horn 4 and the floor force of the electromagnetic probe was set to 100 cm, respectively, according to the specific test conditions that actually exist in the immunity test.
- the metal plate was placed horizontally at a position 15 cm below the electric field probe. This metal plate was projected 20 cm closer to the waveguide 8 than the electric field probe.
- an axial length Lb of 10cm, 30cm, 50cm, 70cm is used, and the waveguide 8 is moved on the radiation axis line, whereby an electromagnetic horn is obtained.
- the distance from the opening end face of 4 to the opening end face of the waveguide 8 (distance between the antenna and the waveguide) La was changed, and the received electric field strength obtained by the electric field probe was measured.
- This measurement result is a measurement result when the frequency f of the electromagnetic wave that also radiates the electromagnetic horn 4 force is set to 2.9 GHz.
- the length Lb of the waveguide 8 is 70 cm under the test conditions described above, the electromagnetic horn 4 and the waveguide Although the transmission loss is less when the gap is closer than the gap between the two, the length Lb of the waveguide 8 is set to 50cm, 30cm, and 10cm. In this case, it was found that the transmission loss is smaller when the electromagnetic horn 4 and the waveguide 8 are arranged apart from each other than when they are closely attached.
- the transmission loss of electromagnetic waves can be minimized when the length Lb of the waveguide 8 is 50 cm.
- the distance La between the antenna and the waveguide is about 10 cm, and the length Lb of the waveguide 8
- the antenna that can minimize the transmission loss of electromagnetic waves when is 30 cm
- the distance La between the waveguides is about 30 cm, and the transmission loss of electromagnetic waves is minimized when the length Lb of the waveguide 8 is 10 cm.
- the resulting distance La between the antenna and the waveguide was about 50 cm.
- the length Lb of the waveguide 8 was determined under the test conditions.
- Specified opening edge force of electromagnetic horn 4 Set to 0.8 to 1.2 times the length of half the distance to the EUT, and the distance between electromagnetic horn 4 and waveguide 8 is the electromagnetic wave. It was found that it should be set between 0.8 times and 1.2 times the wavelength of (about 23 cm at 1.3 GHz and about 10 cm at 2.9 GHz).
- the interval between the electromagnetic horn 4 and the waveguide 8 is adjusted appropriately according to the test condition. I want to be able to do it.
- the electromagnetic horn 4 and the waveguide 8 are supported by the antenna via the support column 22 or the support column 32, respectively. 24 or waveguide support Further, the support 24, 34 is slidably disposed on the slide rail 38 and moved on the slide rail 38, so that the distance between the electromagnetic horn 4 and the waveguide 8 is fixed. It is good to be able to set any.
- the distance between the waveguide 8 and the electromagnetic horn 4 can be adjusted in a state where the central axes of the electromagnetic horn 4 and the waveguide 8 are aligned, the electromagnetic horn 4 and the conductive horn 4 are guided. Axis misalignment with the wave tube 8 can be prevented.
- the electromagnetic horn 4 can also be moved on the slide rail 38. It is also possible to adjust the distance between the test equipment and the test equipment, for example, even when there are test conditions for setting the distance to lm and test conditions for setting the distance to 1. lm. Can be done.
- FIG. 9 (a) is a side view of the electromagnetic horn 4 and the waveguide 8 as seen from the lateral force, and (b) is a front view of the electromagnetic horn 4 as viewed from the opening surface side. (C) is a front view of the waveguide 8 as viewed from the opening surface side.
- the slide rail 38 has two grooves 39 formed below the antenna support base 24 and the waveguide support base 34.
- a plurality of rollers (wheels) 26 and 36 are provided. Therefore, the electromagnetic horn 4 and the waveguide 8 can be moved very easily along the groove of the slide rail 38.
- the outer peripheral surface is fixed at a position where the distance Li from the opening edge is 20 cm.
- the angle D on the opening end side formed by the plate surface of the reflecting plate 44 and the outer peripheral surface of the electromagnetic horn 4 is set to 41 °.
- the electromagnetic horn can be radiated to the EUT more efficiently. You can do it.
- the reflecting plate 44 When the reflecting plate 44 is provided on the electromagnetic horn 4, the reflecting plate 44 may be provided on the left and right outer peripheral surfaces not on the upper and lower outer peripheral surfaces of the electromagnetic horn 4, or on the upper, lower, left and right outer peripheral surfaces. Good. Further, the reflection plate 44 may be configured by arranging a plurality of metal plates substantially in parallel as shown in FIG. 4 as a modified example, not simply by a single metal plate. In this way, the reflection efficiency of the electromagnetic wave by the reflector 44 can be increased, and the electromagnetic wave from the electromagnetic horn 4 can be radiated to the EUT more efficiently.
- a radiating antenna 51 is provided in place of the radiating antenna 5.
- the radiating antenna 51 can adjust the polarization plane of the electromagnetic wave radiated to the EUT 2 to an arbitrary angle.
- Reference numeral 6c denotes a frame for holding the radiating antenna 51 so as to be rotatable about the radiating axis 12.
- Reference numeral 9 denotes a distance measuring device for measuring the distance from the end face of the waveguide 80 (the EUT side) to the EUT 2.
- Reference numeral 15 denotes an electric motor, which is a power source for rotating the 51.
- Reference numeral 16 denotes a driving belt for transmitting the motive power of the electric motor to the radiation antenna 51.
- a flange 47 is formed on the opening surface of the electromagnetic horn 45.
- a flange 82 is also formed at the end of the waveguide 80.
- a recess 65 is provided in the upper part of the gantry 6c, and supports the support 61 via a bearing 60.
- FIG. 11 shows an end view taken along the line AA of FIG.
- Reference numeral 48 denotes an opening of the electromagnetic horn 45, and the opening of the waveguide 80 is also formed in the same shape.
- [0103] 92 is a through hole through which the bolt 90 is passed.
- a plurality of rollers 64 are arranged so that the radiation antenna 5 rotates smoothly.
- the high-frequency signal supplied to the radiating antenna 5 radiates a predetermined electromagnetic field from the electromagnetic horn 45 to the test equipment 2 via the waveguide 80.
- a measuring method for the distance measuring device 9 will be described. As shown in FIG. 12, a plurality of distance measuring devices 9a and 9b are provided below a radiation antenna 51 that radiates electromagnetic waves, with a distance L3.
- each laser pointer is irradiated toward the center of the test plane of EUT 2.
- the opening end force of the waveguide 80 is also calculated from the following formula to the distance L4 to the test plane of the EUT 2 Is possible.
- L5 is the amount of protrusion of the waveguide 80 and is a known value.
- the end face force of the waveguide 80 can be calculated relatively easily without using a measuring instrument, and the distance L4 to the test plane of the EUT 2 can be calculated. wear.
- a circularly polarized wave generator such as a retardation plate is interposed between the probe 40 and the horn.
- the electromagnetic wave frequency is in the 1 GHz band or 3 GHz band.
- the frequency of the electromagnetic wave to be used it can be used in the UHF band to SHF band.
- the gantry 6 is described as a fixed gantry. However, by providing a caster at the bottom of the gantry, movement is facilitated. In addition, it is desirable to have a function that can lock the rotation of the casters so that the base does not move accidentally during measurement.
- a detector for detecting the reflected power is provided between the circulator 14 and the power amplifying device 13, and if the detection signal output by the detector exceeds a predetermined value, the signal is generated. It can be configured to reduce or turn off the signal level output by the instrument.
- the force described as the opening area of the waveguide 8 (or 80) coincides with the opening of the electromagnetic horn 4 (or 45).
- the waveguide is tapered so that the opening is narrower on the EUT side than on the electromagnetic horn 4 side.
- the test equipment side is wider than the electromagnetic horn 4 side so that the opening is wider.
- the waveguide 8d with a pad can be corrected so as to guide the radiation direction of the electromagnetic wave from the electromagnetic horn 4 to the EUT, as shown in Fig. 13 (e-1) and (e-2)
- the wave guide plates 8e and 8f are provided horizontally or vertically in front of the electromagnetic horn 4, the effect can be obtained.
- FIGS. 13 (a) to (e) the figure given “-1” is a side view of the electromagnetic horn 4 and the waveguide 8 seen from the lateral direction, and “1 2”.
- FIG. 6 is an explanatory diagram showing a state in which the opening surface of the electromagnetic horn 4 is viewed through the waveguide 8.
- the waveguide plates 8e and 8f and the waveguides 8a to 8d may be formed of a mesh shape having a shielding effect that is not necessarily formed of a metal plate.
- the open end force of the electromagnetic horn 4 is also defined as the distance to the EUT (reception point) under the test conditions of the immunity test.
- the distance from the open end of the waveguide 8 to the EUT is specified as a test condition, as shown in FIG.
- the length Lb of the waveguide 8 and the distance La between the electromagnetic horn 4 and the waveguide 8 it is possible to realize a test apparatus that can efficiently radiate electromagnetic waves to the EUT. it can.
- the size of the electromagnetic horn 4 itself was not specifically described.
- the antenna gain of the radiating antenna 5 is determined by the opening area of the electromagnetic horn 4 and the gain reduction amount. The larger the opening area of the electromagnetic horn 4, the larger it becomes.
- the gain reduction amount of the electromagnetic horn 4 becomes smaller as the length of the electromagnetic horn 4 in the central axis direction is longer.
- the electromagnetic horn 4S of length LS when the electromagnetic horn 4S of length LS is used as the electromagnetic horn 4 and when the electromagnetic horn 4L of length LL (LL> LS) is used as the electromagnetic horn 4, at the reception point.
- the input signals Sinl and Sin2 input to the electromagnetic horns 4S and 4L can be set to different signal levels in order to make the electric field strength of the electromagnetic horns 4S and 4L the same.
- the signal level of the input signal can be reduced by using it.
- the electromagnetic horn 4 having a long length in the central axis direction.
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Abstract
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Application Number | Priority Date | Filing Date | Title |
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DE112006002864T DE112006002864T5 (de) | 2005-10-27 | 2006-10-26 | Vorrichtung zur Prüfung der Störungsunanfälligkeit |
US12/084,451 US7999560B2 (en) | 2005-10-27 | 2006-10-26 | Interference exclusion capability testing apparatus |
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JP2005-313405 | 2005-10-27 | ||
JP2005313405A JP5048234B2 (ja) | 2004-10-27 | 2005-10-27 | 妨害排除能力試験装置 |
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WO2007049715A1 true WO2007049715A1 (ja) | 2007-05-03 |
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DE (1) | DE112006002864T5 (ja) |
WO (1) | WO2007049715A1 (ja) |
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US7999560B2 (en) | 2011-08-16 |
US20090140750A1 (en) | 2009-06-04 |
DE112006002864T5 (de) | 2008-09-11 |
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