JP2011128131A - Antenna position setting device of radiation emi measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To switch and measure polarization planes of a plurality of antennas position-set for performing EMI (electromagnetic interference) measurement of a GHz band to different polarization planes. <P>SOLUTION: An antenna position setting device of the radiation EMI measuring device horizontally positions phase center points of the plurality of antennas 2<SB>1</SB>and 2<SB>2</SB>for measurement, by turning angle adjustment blocks 4<SB>1</SB>and 4<SB>2</SB>with respect to height adjustment blocks 6<SB>1</SB>and 6<SB>2</SB>, and matches the heights of the phase center points of the plurality of antennas 2<SB>1</SB>and 2<SB>2</SB>for measurement by sliding the height adjustment blocks 6<SB>1</SB>and 6<SB>2</SB>along antenna masts 5<SB>1</SB>and 5<SB>2</SB>. The antenna position setting device includes polarization plane switching mechanisms (9<SB>1</SB>, 9<SB>2</SB>, 10<SB>1</SB>, 10<SB>2</SB>, 11<SB>1</SB>, 11<SB>2</SB>, 12, 13, 14, and 15) that are connected to the other side of respective antenna shafts 3<SB>1</SB>and 3<SB>2</SB>, and rotate the respective polarization planes of the antennas 2<SB>1</SB>and 2<SB>2</SB>for measurement by 90°, by rotating the antenna shafts 3<SB>1</SB>and 3<SB>2</SB>. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an antenna position setting device for a radiation EMI (Electro Magnetic Interference) measuring device that detects and measures interference noise from an electronic device.

As an EMC (Electro-Magnetic Compatibility) test that evaluates the electromagnetic compatibility of electronic devices and electronic components, the emission measurement measures the magnitude of electromagnetic interference emitted from the electronic devices and electronic components themselves. (Referred to as EMI measurement) and immunity test (referred to as EMS (Electro Magnetic Susceptibility) test) for evaluating the tolerance of a device when receiving electromagnetic interference from the outside.
In the conventional radiated EMI measurement device, the number of measurement antennas used is one, and when the electromagnetic interference radiated from the EUT deviates from the beam width of the measurement antenna, the measurement antenna is moved to perform measurement. There is a need to. For example, when an electromagnetic interference wave is radiated away from the beam width of the measurement antenna in the height direction, the measurement antenna can be moved in the height direction (height scan) to perform measurement (for example, patent) Reference 1). When the measurement antenna is moved in this way, if the measurement frequency is less than 1 GHz, the movement speed of the measurement antenna is at most several cm / second. On the other hand, when the measurement frequency is 1 GHz or more, the beam width of the measurement antenna is narrowed. Therefore, in order to maintain the measurement accuracy, it is necessary to make the moving speed of the measurement antenna slower than when measuring in the MHz band. Therefore, it takes more time to measure the radiation EMI from all the parts in the EUT, than in the case of the MHz band.

  As a technique for solving the above-mentioned conventional problems, in Japanese Patent Application No. 2009-76430, which is an application related to the present applicant, a plurality of measurement antennas are arranged in a row horizontally with their phase center points facing the EUT. In this case, the antenna positioning mechanism is designed so that the height of each phase center point is supported and the beam radiation direction of the measurement antenna can be installed at an elevation angle and depression angle in the height direction of the EUT. And a radiation EMI measuring apparatus has been proposed in which reception outputs from a plurality of measurement antennas are combined to measure electromagnetic interference from a test equipment. By using this technique, it is possible to suppress radiation pattern interference due to the phase difference of a plurality of measurement antennas, and by tilting each beam radiation direction of the plurality of measurement antennas, a high frequency band (for example, a GHz band) ), A radiation pattern with a wide beam width is obtained, and the measurement time in the measurement in the GHz band is greatly increased without moving one antenna in the height direction or the horizontal direction as in the conventional height scan. It can be shortened.

An example of the structure of the antenna positioning mechanism is shown in FIG. Two antenna masts 5 ₁ and 5 ₂ are supported upright and parallel to the support base 1. Height adjustment blocks 6 ₁ and 6 ₂ are attached to the antenna masts 5 ₁ and 5 ₂ , respectively, so that they can be raised and lowered using the mast as a guide. The height adjustment blocks 6 ₁ and 6 ₂ have horizontal screw shafts 7 ₁ and 7 ₂ , and the angle adjustment blocks 4 ₁ and 4 ₂ are rotatably supported by the screw shafts 7 ₁ and 7 ₂ . The measurement antennas 2 ₁ and 2 ₂ are attached to one ends of the antenna shafts 3 ₁ and 3 ₂ , respectively. Antenna shaft 3 _1, 3 ₂ is inserted at the other end to the angle adjustment block 4 _1, 4 ₂ holes, and is supported by angle adjusting blocks 4 _1, 4 ₂ pivotally as indicated by arrow. When performing EMI measurement, the height position and orientation (elevation angle, depression angle) of the measurement antennas 2 ₁ and 2 ₂ are set in advance. Specifically, the angle adjustment blocks 4 ₁ and 4 ₂ are rotated around the screw shafts 7 ₁ and 7 ₂ to align the phase center points of the measurement antennas 2 ₁ and 2 ₂ in the horizontal direction, Next, the height adjustment blocks 6 ₁ and 6 ₂ are slid vertically along the antenna masts 5 ₁ and 5 ₂ to match the heights of the measurement antennas 2 ₁ and 2 ₂ (the height of the phase center point). And fix at that position. As a result, the phase center points of the measurement antennas 2 ₁ and 2 ₂ are arranged in a line horizontally at the same height, and the elevation angle and depression angle are also set.

  By the way, the electromagnetic interference that is the object of radiation EMI measurement is not limited to one type of polarization, but includes vertical polarization and horizontal polarization. Therefore, it is necessary to perform measurement using an antenna having a polarization plane corresponding to each polarization to be measured.

JP 2001-324524 A

  When changing the plane of polarization of an antenna, if there is only one antenna for measurement as in Patent Document 1, it is only necessary to change the plane of polarization for one antenna. In the case of a plurality of antennas as shown in FIG. 5, the polarization plane of each measurement antenna is individually changed. It is not easy to keep the position of the antenna constant when changing the polarization plane with high accuracy. In addition, there is a method to prepare an antenna positioning mechanism for each polarization plane in order to keep the antenna position constant when the polarization plane is changed. In that case, an antenna integrated with the positioning mechanism is required, so the device configuration There is a problem that maintenance management becomes cumbersome.

  The present invention has been made to solve the above-described problems, and enables measurement by switching the polarization planes of a plurality of antennas positioned for performing EMI measurement in the GHz band to different polarization planes as they are. An object of the present invention is to obtain an antenna position setting device for a radiation EMI measuring device.

  An antenna position setting device for a radiated EMI measurement device according to the present invention includes a plurality of measurement antennas and an antenna shaft having the measurement antenna attached to one end thereof, and the antennas are rotatably supported around the shaft. An angle adjustment block, and a height adjustment block for each antenna that is supported by a plurality of antenna masts supported upright and in parallel so as to be movable up and down, and each supports the corresponding angle adjustment block so as to be rotatable around a horizontal axis. Rotate the angle adjustment block with respect to the height adjustment block to align each phase center point of multiple antennas for measurement in the horizontal direction, and slide the height adjustment block along the antenna mast. An antenna position setting device for a radiated EMI measurement device that matches the heights of phase center points of a plurality of measurement antennas, Is connected to the other end of the antenna shaft, in which the plane of polarization of each of the measuring antenna by rotating the antenna shaft with a polarization switching mechanism which rotates 90 degrees.

  According to the present invention, in the radiation EMI measurement in the GHz band using a plurality of antennas, the polarization plane of the measurement antenna can be changed with high accuracy. Further, when switching the polarization plane, an antenna fixing jig for each polarization is not required, and the antenna for each polarization plane is shared, so that the equipment cost can be reduced.

It is a perspective view which shows schematic structure of the antenna position setting apparatus by Embodiment 1 of this invention. It is a fragmentary perspective view which shows the structural example of the antenna angle adjustment mechanism which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the polarization plane of the antenna which concerns on Embodiment 1 of this invention. It is a perspective view which shows schematic structure of the antenna position setting apparatus by Embodiment 2 of this invention. It is a perspective view which shows the structural example of the positioning mechanism of the antenna for a measurement. It is a partially cutaway front view of the angle adjustment block of the antenna position setting device according to Embodiment 2 of the present invention. It is a fragmentary perspective view which shows the structural example of the scale for angle positioning of the antenna angle adjustment mechanism which concerns on Embodiment 3 of this invention. It is a perspective view which shows schematic structure of the antenna position setting apparatus by Embodiment 4 of this invention. It is a perspective view which shows schematic structure of the antenna position setting apparatus by Embodiment 5 of this invention. It is a partially cutaway front view of the polarization plane switching mechanism according to Embodiment 5 of the present invention. It is a fragmentary perspective view which shows schematic structure of the antenna position installation apparatus by Embodiment 6 of this invention. It is explanatory drawing which shows the horizontal rotation moving mechanism which concerns on Embodiment 6 of this invention. It is explanatory drawing which shows another example of the horizontal rotation moving mechanism which concerns on Embodiment 6 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a perspective view showing a schematic configuration of an antenna position setting device according to Embodiment 1 of the present invention, and FIG. 2 is a partial perspective view showing a structural example of an antenna angle adjusting mechanism of the antenna position setting device. In FIG. 1, the antenna angle adjustment mechanism is not shown.
In FIG. 1, a pair of measurement antennas 2 ₁ and 2 ₂ are used in this example as antennas that receive interference waves emitted from a measurement target such as an electronic device. The measurement antennas 2 ₁ and 2 ₂ are attached to one ends of the antenna shafts 3 ₁ and 3 ₂ . The antenna shafts 3 ₁ and 3 ₂ are inserted into the holes of the angle adjusting blocks 4 ₁ and 4 _{2 serving} as bearings, and are held rotatably at the intermediate portions as indicated by arrows in FIG. The support base 1 supports the two antenna masts 5 ₁ and 5 ₂ upright and in parallel. The antenna mast 5 _1, 5 _2, the height adjustment block 6 ₁ and 6 ₂ are vertically movably mounted respectively along the antenna mast 5 _1, 5 _2. Height adjustment block 6 ₁ and 6 _2, has been integrated with the support plate _81, 82 of the lifting direction parallel to the plane of the block, angle adjusting blocks 4 ₁ This supporting plate _81, 82, 4 _Supports the angle of ₂ so that it can be set. That is, as shown in FIG. 2, the support plate 8 ₂ has a through hole into which the screw shaft (horizontal shaft) 7 ₂ is inserted and an arc groove 70 ₂ centered on the through hole into which the variable angle screw 71 ₂ is inserted. Is provided. The screw shaft 7 ₂ and the variable angle screw 71 ₂ are screwed into an angle adjustment block 4 ₂ that is in contact with the opposite surface of the support plate 8 ₂ . Therefore, the angle adjusting blocks 4 ₂ rotates around the screw shaft 7 _2, at a desired position, the screw shaft 7 _2, by tightening the variable angle screws 71 ₂ has been rotated along the arcuate groove 70 _2, the angle The tilt angle of the adjustment block 4 ₂ , that is, the measurement antenna 2 ₂ held by this block can be set.

The other ends of the antenna shafts 3 ₁ and 3 ₂ that are rotatably held by the angle adjustment blocks 4 ₁ and 4 ₂ are connected to _one end of the rotating shafts 10 ₁ and 10 ₂ via the universal joints 9 ₁ and 9 _2. It is connected. Shaft 10 ₁ of the intermediate portion and the rotational shaft 10. the same number of teeth on the _second end of the gear 11 _1, 11 ₂ are provided, both gears 11 _1, 11 ₂ while being coupled by a gear belt 12, a synchronous rotating mechanism It is composed. Rotation speed reduction mechanism 13 is provided on the further other end of the rotary shaft 10 _1. An operation shaft 14 that is rotated by a handle 15 is connected to the drive side of the rotation speed reduction mechanism 13. The rotating shafts 10 ₁ and 10 ₂ and the operation shaft 14 should be supported by bearings at appropriate positions, but here the bearings are omitted for the sake of explanation.

When performing EMI measurement, the height position and orientation (elevation angle, depression angle) of the measurement antennas 2 ₁ and 2 ₂ are set in advance. First, the angle adjustment blocks 4 ₁ and 4 ₂ are rotated around the screw shafts 7 ₁ and 7 ₂ to horizontally align the phase center points of the measurement antennas 2 ₁ and 2 ₂ . The height adjustment blocks 6 ₁ and 6 ₂ are slid vertically along the antenna masts 5 ₁ and 5 ₂ so that the heights of the measurement antennas 2 ₁ and 2 ₂ (the height of the phase center point) are matched. Fix in position. As a result, the phase center points of the measurement antennas 2 ₁ and 2 ₂ are arranged in a line horizontally at the same height, and the elevation angle and depression angle are also set.

For example, it is assumed that the antenna is positioned with respect to the plane of polarization where the position of the measurement antennas 2 ₁ and 2 ₂ can receive vertical polarization, and EMI measurement is performed. Then, turning the handle 15, the operation shaft 14 around the rotation shaft 10 ₁ is rotated deceleration minute through the rotary speed reduction mechanism 13. The rotation of the rotating shaft 10 ₁ rotates the antenna shaft 3 ₁ via the universal joint 9 ₁ , and thereby the measuring antenna 2 ₁ fixed to the tip of the antenna shaft 3 ₁ is also rotated. Polarization of the measuring antenna 2 ₁ stops rotation of the handle 15 in a position rotated exactly 90 degrees. In operation in this case, synchronous rotation mechanism consisting of the gear 11 _1, gear belt 12, gear 11 ₂ gives the rotation of the same angle amount and the rotation of the rotary shaft 10 ₁ on the rotation shaft 10 _2. Thus, the rotation of the rotary shaft 10 ₂ rotates the antenna shaft 3 ₂ via a universal joint 9 ₂ rotates 90 degrees the polarization plane of the antenna shaft 3 _second tip which is fixed to the measuring antenna 2 _2. As a result, the polarization planes of both measurement antennas 2 ₁ and 2 ₂ are rotated by 90 degrees to switch from the vertical polarization shown in FIG. 3 (1) to the horizontal polarization shown in FIG. 3 (2).

As described above, according to the first embodiment, the antenna shafts 3 ₁ and 3 ₂ are connected to the other end sides, and the antenna shafts 3 ₁ and 3 ₂ are rotated to measure the antennas 2 ₁ and 2 ₂ for measurement. In addition to setting the position of the antenna for measurement in the radiation EMI measurement in the GHz band using a plurality of antennas, the polarization plane of the antenna is increased. The accuracy can be changed. In addition, it is possible to reduce the equipment cost by eliminating the need for an antenna fixing jig for each polarization and sharing the antenna. In addition, when switching the polarization plane, the rotation given to one of the rotating shafts by the operation is transmitted to the remaining rotating shafts via the synchronous rotating mechanism. The wavefront can be switched.

Embodiment 2. FIG.
First, before describing the polarization plane positioning unit according to the second embodiment, a configuration of an antenna position installation apparatus different from that in FIG. 1 to which the polarization plane positioning unit is applied will be described.
FIG. 4 is a perspective view showing a schematic configuration of an antenna position setting apparatus according to Embodiment 2 of the present invention. In the figure, portions corresponding to those in FIG. 1 are denoted by the same reference numerals, and the same description is omitted in principle. In FIG. 4, the antenna angle adjustment mechanism is not shown.
In the antenna position installation apparatus shown in FIG. 4, the configuration from the measurement antennas 2 ₁ and 2 ₂ to the universal joints 9 ₁ and 9 ₂ is the same as that of the first embodiment, but the measurement antennas 2 ₁ and 2 ₂ The operation system for switching the polarization plane is constituted by a separate drive mechanism without using a synchronous rotation mechanism. That is, the rotary shafts 10 ₁ and 10 ₂ connected to the universal joints 9 ₁ and 9 ₂ are connected to the corresponding operation shafts 14 ₁ and 14 ₂ and the corresponding handles 15 ₁ and 15 via the rotation speed reduction mechanisms 13 ₁ and 13 ₂ . 15 ₂ is connected. Accordingly, the polarization planes of the measurement antennas 2 ₁ and 2 ₂ are independently changed. In this case, it is possible to cope with a case where the elevation angle and depression angle are varied.

Next, polarization plane positioning means applied to the antenna position setting device shown in FIG. 1 or 4 will be described.
6 is a partially cutaway front view of an angle adjustment block of an antenna position setting device according to Embodiment 2 of the present invention as viewed from the antenna side.
In the second embodiment, a concentric ring 18 ₁ is fixed to the antenna shaft 3 ₁ drawn in cross section, and a protrusion 19 ₁ extending in the normal direction is provided on the outer periphery of the ring 18 ₁ . Further, stoppers 20 ₁ and 21 ₁ are provided on the surface of the angle adjustment block 4 _{1 from which} the antenna shaft 3 ₁ protrudes, spaced by 90 degrees.
As described in the first embodiment, the antenna shaft 3 ₁ is rotatably held with the angle adjustment block 4 ₁ as a bearing. When the antenna shaft 3 ₁ is rotated leftward or rightward around its own axis, the projection 19 ₁ is formed. Stops in contact with the stopper 20 ₁ or 21 ₁ . Thus, the horizontal polarization plane and the vertical polarization plane of the measurement antenna 2 ₁ attached to the tip of the antenna shaft 3 ₁ are defined.

As described above, according to the second embodiment, between the antenna shaft 3 ₁ and the angle adjusting blocks 4 _1, horizontal polarization and vertical at the position where the antenna shaft 3 ₁ is rotated 90 degrees by the polarization switching mechanism Since the polarization plane positioning means (18 ₁ , 19 ₁ , 20 ₁ , 21 ₁ ) for defining the polarization plane is provided, the polarization can be changed more accurately.
In the above description of FIG. 6, the antenna shaft 3 ₁ and the angle adjustment block 4 ₁ side have been described, but the other antenna shaft 3 ₂ and the angle adjustment block 4 ₂ side have the same configuration.

Embodiment 3 FIG.
FIG. 7 is a partial perspective view showing a structural example of an angle positioning scale of the antenna angle adjusting mechanism according to Embodiment 3 of the present invention.
Height adjustment block 6 ₂ has integrated the support plate ₈₂ of the elevating direction parallel to the plane of the block, the support plate _82, through holes for inserting the screw shaft (horizontal shaft) 7 ₂ And a circular arc groove 70 ₂ centering on the through hole into which the variable angle screw 71 ₂ is inserted. The screw shaft 7 ₂ and the variable angle screw 71 ₂ are screwed into an angle adjustment block 4 ₂ that is in contact with the opposite surface of the support plate 8 ₂ . Angle adjusting blocks 4 ₂ rotates in the elevation-depression direction about the screw shaft 7 _2, at a desired position, tightening the screw shaft 7 _2, the variable angle screw 71 ₂ has been rotated along the arcuate groove 70 ₂ Thus, the angle adjusting block 4 ₂ is fixed to the support plate 8 ₂ at a certain angle. Thereby, the inclination angle of the measurement antenna 2 ₂ fixed to the tip of the antenna shaft 3 ₂ held by the angle adjustment block 4 ₂ is set. In addition Embodiment 3, the support plate ₈₂ a variable angle screw 71 the angle positioning scale 75 ₂ representing the position of the inclination angle of the measurement antenna 2 _{2 2} outer periphery of the arcuate groove 70 ₂ is guided is provided, this The angle of the measuring antenna 2 ₂ is determined by aligning and tightening the variable angle screw 71 ₂ at a predetermined position on the scale.

As described above, according to the third embodiment, the height adjustment block 6 ₂ has the angle positioning scale 75 ₂ for determining the inclination angle of the measurement antenna 2 ₂ around the screw shaft (horizontal axis) 7 ₂ . since provided for rotatably supported to the angle adjusting blocks 4 ₂ inclination, it becomes possible to accurately set the angle of the measuring antenna 2 _2.
In the description of FIG. 7 described above, the antenna shaft 3 ₂ and the angle adjustment block 4 ₂ side are described, but the other antenna shaft 3 ₁ and the angle adjustment block 4 ₁ side have the same configuration.

Embodiment 4 FIG.
FIG. 8 is a perspective view showing a schematic configuration of an antenna position setting apparatus according to Embodiment 4 of the present invention. In the figure, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted in principle. In FIG. 8, the antenna angle adjustment mechanism is not shown. In FIG. 4 described above, each of the antenna masts of the plurality of measurement antennas is supported by one fixed support base. However, in the fourth embodiment, one of the plurality of measurement antennas is separated. A mechanism for supporting the movable support base in a horizontal direction will be described.

8, the antenna mast 5 ₁ of the measuring antenna 2 ₁ set in the depression angle direction are supported by a fixed support 23 placed on the horizontal floor (or ground). On the other hand, the antenna mast 5 ₂ of the measurement antenna 2 ₂ set in the elevation angle direction is supported by a movable support base 24 having wheels 25. The wheel 25 of the movable support 24 is engaged with two parallel guide rails 29 so as to be able to roll. Both ends of a gear belt 28 extending in parallel with the guide rail 29 are fixed to the movable support base 24, and the gear belt 28 is hung on gears 26 and 27 installed before and after the movable support base 24. Although not shown, one of the gears 26 and 27 is rotated by a power source.

Now, for example, when the gear 27 is rotated, the movable support 24 is pulled by the gear belt 28 and moves along the guide rail 29 in the horizontal direction. Depending on the moving direction, the movable support base 24 moves away from or approaches the fixed support base 23. That is, the antenna mast 5 ₂ measuring antenna 2 ₂ facing the supported elevation through the measuring antenna 2 ₁ of immobility facing depression angle that is supported via the other antenna mast 5 ₁ Will move away from or close to.

As described above, according to the fourth embodiment, a specific antenna (for example, 2 ₂ ) among the plurality of measurement antennas 2 ₁ and 2 ₂ is supported by the separate movable support base 24, and the movable antenna is used. comprising a support base movable means for moving the support table 24 in the horizontal direction (25,26,27,28,29), by the movement of the movable support table 24 to move the position of the particular antenna 2 ₂ in the horizontal direction As a result, one antenna itself can be moved in the horizontal direction, the antenna polarization can be changed without interfering with each other, and the installed antenna can be used regardless of the type. become.

Embodiment 5 FIG.
FIG. 9 is a partial perspective view showing a schematic configuration of an antenna position setting device according to Embodiment 5 of the present invention, and FIG. 10 is a partial view of a polarization plane switching mechanism according to Embodiment 5 of the present invention as viewed from the antenna side. It is a notch front view. 9, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted in principle. In FIG. 9, the antenna angle adjusting mechanism is not shown. In Embodiment 1-4 above, the polarization plane switching mechanism that switches the polarization plane of each antenna is connected to the other end of the antenna shaft to which each measurement antenna is attached. A description will be given of the polarization plane switching mechanism built into the angle adjustment block holding each antenna shaft.

9, angle adjusting blocks 4 ₁ of the measuring antenna 2 ₁ set in the depression angle direction is divided into a first holding block 41 ₁ and the second holding block 42 ₁ which is fixed by the fixing mechanism 43 _1. Antenna shaft 3 _1, first retention block ₄₁₁ and is rotatably held in the second holding block 42 _1, a fixed mechanism 43 _a portion of between ₁ and the first holding block 41 and the second holding block 42 ₁ Exposed outside.

As shown in FIG. 10, a handle 30 ₁ extending in the normal direction is provided at the fixing mechanism 43 ₁ portion of the antenna shaft 3 ₁ . Further, stoppers 31 ₁ and 32 ₁ are provided on the surface of the second holding block 42 ₁ facing the first holding block 41 ₁ and spaced by 90 degrees.
The stoppers 31 ₁ and 32 ₁ may be provided not on the second holding block 42 ₁ but on the surface of the first holding block 41 ₁ facing the second holding block 42 ₁ or on the fixing mechanism 43 _1. Good.

The antenna shaft 3 ₁ is rotatably held with the angle adjustment block 4 ₁ (first and second holding blocks 41 ₁ , 42 ₁ ) as a bearing, and is rotated left or right around its own axis by the handle 30 _1. Then, the handle 30 ₁ comes into contact with the stopper 31 ₁ or 32 ₁ and stops. Thus, the horizontal polarization plane and the vertical polarization plane of the measurement antenna 2 ₁ attached to the tip of the antenna shaft 3 ₁ are defined.

As described above, according to the fifth embodiment, angle adjusting blocks 4 ₁ was divided first holding block 41 ₁ and the second holding block 42 _1, a first holding block 41 ₁ second holding block 42 _The polarization plane switching mechanism (30 ₁ , 31 ₁ , 32 ₁ ) for changing the polarization direction of the polarization plane of the measurement antenna 2 ₁ is built in between the antenna shaft 3 ₁ and the antenna ₁ . Therefore, the polarization plane switching mechanism can be simplified, and a more compact and accurate polarization changing mechanism can be achieved.
9 and 10, the antenna shaft 3 ₁ and the angle adjustment block 4 ₁ side have been described, but the other antenna shaft 3 ₂ and the angle adjustment block 4 ₂ side have the same configuration.

Embodiment 6 FIG.
FIG. 11 shows a schematic configuration of an antenna position setting device according to Embodiment 6 of the present invention. The rear side portions from the angle adjustment blocks 4 ₁ and 4 ₂ (from the universal joints 9 ₁ and 9 ₂ to the handles 15 ₁ and 15 _{2 are shown.} FIG. 12 is an explanatory view showing a horizontal rotational movement mechanism according to Embodiment 6 of the present invention, and FIG. 13 is an explanatory view showing another example of the horizontal rotational movement mechanism. 11, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted in principle. In FIG. 11, the illustration of the antenna angle adjustment mechanism is omitted. 12 and 13, the arrangement of the antenna masts 5 ₁ and 5 ₂ and the measurement antennas 2 ₁ and 2 ₂ is shown in a simplified manner. In FIG. 4 described above, each of the antenna masts of the plurality of measurement antennas is supported by one fixed support base. However, in the sixth embodiment, one of the plurality of measurement antennas is separated. A mechanism for supporting this antenna by moving it in the horizontal direction and rotating it will be described.

11, the antenna mast 5 ₁ of the measuring antenna 2 ₁ set in the depression angle direction are supported by the fixing support 33 placed on the horizontal floor (or ground). On the other hand, the antenna mast 5 ₂ of the measurement antenna 2 ₂ set in the elevation angle direction is supported by the movable support base 34 on the fixed support base 33. The movable support table 34 is capable of moving in a horizontal direction along the groove 35 provided on the fixing support 33, and an antenna mast 5 ₂ can be rotated around the axis. The movable support base 34 can be fixed to the fixed support base 33 by a fixing mechanism 36.

During normal use shown in FIG. 12A, the movable support base 34 is fixed to the fixed support base 33 by the fixing mechanism 36 so that the horizontal distance between the measurement antennas 2 ₁ and 2 ₂ becomes a predetermined distance. by the antenna mast 5 ₂ is fixed. However, when the antenna separate orientation rotated 90 degrees to the left polarization change in this state, the horizontal spacing of the measuring antenna 2 _1, 2 ₂ is short, the measuring antenna 2 _1, 2 ₂ interference May end up. Therefore, as shown in FIG. 12 (b), when the polarization change, release the measuring antenna 2 ₂ by rotating the antenna mast 5 ₂ around the axis from the measurement antenna 2 _1, measuring antenna 2 ₁ , 2 ₂ Change the direction of polarization. Then returned to the original position of the antenna mast 5 ₂ rotate in opposite directions about the axis. Thereby, even when the horizontal interval between the measurement antennas 2 ₁ and 2 ₂ during normal use is short, the polarization can be changed without the measurement antennas 2 ₁ and 2 ₂ interfering with each other.

When the type or size of the measurement antennas 2 ₁ and 2 ₂ is changed, the measurement antennas 2 ₁ and 2 are restored when the antenna mast 5 ₂ is rotated and the original position is returned. ₂ may interfere. Therefore, as shown in FIG. 12 (c), when the change is made, the fixing mechanism 36 is once released, and the antennas up to a position where the measurement antennas 2 ₁ and 2 ₂ after changing the type or size are assumed not to interfere with _{each other} are used. mast 5 ₂ is moved and fixed by the fixing mechanism 36 again. Thereafter, the measuring antenna 2 ₂ by rotating the antenna mast 5 ₂ around the axis further away from the measuring antenna 2 _1, changing the measuring antenna 2 _1, 2 ₂ types or sizes, respectively. Then returned to the original position of the antenna mast 5 ₂ rotate in opposite directions about the axis. As a result, when the type or size of the measurement antennas 2 ₁ and 2 ₂ is changed, the measurement antennas 2 ₁ and 2 ₂ can be changed even when the horizontal distance between the measurement antennas 2 ₁ and 2 ₂ is short. Changes can be made without interference.

Further, in order to ensure the horizontal position of the measurement antenna 2 ₂ , as shown in FIG. 13, a protrusion 37 that rotates together with the antenna mast 5 ₂ at any position of the antenna mast 5 ₂ , and the rotation of the protrusion 37. A base 39 having a stopper 38 that regulates the above may be provided. Since this by projections 37 when completed is commonly used during or polarization change back to normal use contacts the stopper 38, it is possible reliably determine the horizontal position of the measuring antenna 2 _2.

As described above, according to the sixth embodiment, a specific antenna (for example, 2 ₂ ) among the plurality of measurement antennas 2 ₁ and 2 ₂ is supported by the separate movable support base 34, and the antenna is mounted. a support base movable means for moving parallel to the horizontal direction (35, 36), and a horizontal rotating means for rotating the antenna mast 5 ₂ around the axis (34, 35), identified by the movement of the movable support table 34 Since the position of the antenna 2 ₂ is moved in the horizontal direction and the antenna 2 ₂ is rotated in the horizontal direction around the axis, one antenna can be moved and rotated in the horizontal direction. It becomes possible to change the polarization of the antenna without interference between the antennas, and it is possible to change the antenna without selecting the type and size of the antenna to be installed.

In the explanation of FIG. 11, the case where the support base moving means and the horizontal rotation means are applied to the antenna position setting device in which the polarization plane switching mechanism is connected to the end side of the antenna shaft has been described. May be applied to an antenna position setting device built in the angle adjustment block.
In the description of FIG. 11 described above, the case where the support base moving means and the horizontal rotation means are provided has been described. However, only the horizontal rotation means may be provided.

1 support base, 2 ₁ , 2 ₂ antenna for measurement, 3 ₁ , 3 ₂ antenna shaft, 4 ₁ , 4 ₂ angle adjustment block, 5 ₁ , 5 ₂ antenna mast, 6 ₁ , 6 ₂ height adjustment block, 7 ₁ , 7 ₂ screw shaft, 8 ₁ , 8 ₂ support plate, 9 ₁ , 9 ₂ universal joint, 10 ₁ , 10 ₂ rotation shaft, 11 ₁ , 11 ₂ gear, 12, 28 gear belt, 13, 13 ₁ , 13 ₂ rotation Deceleration mechanism, 14, 14 ₁ , 14 ₂ operation shaft, 15, 15 ₁ , 15 ₂ , 30 ₁ handle, 18 ₁ ring, 19 ₁ , 37 protrusion, 20 ₁ , 21 ₁ , 31 ₁ , 32 ₁ , 38 stopper, 23, 33 Fixed support base, 24, 34 Movable support base, 25 wheels, 26, 27 gear, 29 guide rail, 35 groove, 36, 43 ₁ fixing mechanism, 39 base, 41 ₁ first holding block, 42 _1st 2 holding blocks, 70 ₂ circular grooves, 71 ₂ variable Angle screw, 75 ₂ angle positioning scale.

Claims (10)

Multiple measurement antennas;
An angle adjustment block for each antenna that inserts an antenna shaft attached to one end of the measurement antenna and supports the shaft rotatably around the axis;
A plurality of antenna masts supported upright and in parallel, each of which is supported so as to be able to move up and down, and each of which includes a height adjustment block for each antenna that supports the corresponding angle adjustment block rotatably around a horizontal axis;
The angle adjustment block is rotated with respect to the height adjustment block to horizontally align the phase center points of the plurality of measurement antennas, and the height adjustment block is slid along the antenna mast. An antenna position setting device for a radiation EMI measuring device that matches the heights of the phase center points of a plurality of measurement antennas,
An antenna of a radiated EMI measurement apparatus comprising a polarization plane switching mechanism connected to the other end side of each antenna shaft and rotating each antenna plane by 90 degrees by rotating the antenna shaft. Position setting device. Polarization plane switching mechanism
A universal joint connected to the other end of each antenna shaft;
A rotating shaft provided on the other end of each universal joint;
A rotation reduction mechanism that decelerates and applies rotation given by operation to one of the rotation shafts;
The antenna position setting device for a radiated EMI measurement device according to claim 1, further comprising a synchronous rotation mechanism that transmits a reduced rotation given to the one rotation shaft to the remaining rotation shafts.   The polarization plane switching mechanism includes polarization plane positioning means for defining a horizontal polarization plane and a vertical polarization plane at a position where the antenna shaft is rotated 90 degrees by the polarization plane switching mechanism between each antenna shaft and the angle adjustment block. The antenna position setting device for a radiated EMI measuring device according to claim 1.   2. The height adjustment block according to claim 1, wherein an angle positioning scale for determining an inclination angle of the measurement antenna is provided with respect to an inclination of the angle adjustment block that is rotatably supported around the horizontal axis. Antenna position setting device for radiated EMI measurement device.   A specific antenna among a plurality of measurement antennas is supported by a separate movable support base and includes a support base movable means for moving the movable support base in the horizontal direction. The antenna position setting device for a radiated EMI measuring apparatus according to claim 1, wherein the position of the antenna is moved in the horizontal direction. Multiple measurement antennas;
An angle adjustment block for each antenna that inserts an antenna shaft attached to one end of the measurement antenna and supports the shaft rotatably around the axis;
A plurality of antenna masts supported upright and in parallel, each of which is supported so as to be able to move up and down, and each of which includes a height adjustment block for each antenna that supports the corresponding angle adjustment block rotatably around a horizontal axis;
The angle adjustment block is rotated with respect to the height adjustment block to horizontally align the phase center points of the plurality of measurement antennas, and the height adjustment block is slid along the antenna mast. An antenna position setting device for a radiation EMI measuring device that matches the heights of the phase center points of a plurality of measurement antennas,
The antenna position setting device for a radiated EMI measurement apparatus, wherein the angle adjustment block includes a polarization plane switching mechanism that rotates the antenna shaft to rotate each polarization plane of the measurement antenna by 90 degrees.   7. The radiation according to claim 6, wherein the polarization plane switching mechanism includes polarization plane positioning means for defining a horizontal polarization plane and a vertical polarization plane at a position where the antenna shaft is rotated 90 degrees by the polarization plane switching mechanism. Antenna position setting device of EMI measuring device.   7. The height adjusting block according to claim 6, wherein an angle positioning scale for determining an inclination angle of the measurement antenna is provided with respect to an inclination of the angle adjusting block that is rotatably supported around the horizontal axis. Antenna position setting device for radiated EMI measurement device.   A specific antenna among a plurality of measurement antennas is supported by a separate movable support base and includes a support base movable means for moving the movable support base in the horizontal direction. 7. The antenna position setting device for a radiated EMI measuring apparatus according to claim 6, wherein the position of the antenna is moved in the horizontal direction.   7. The antenna position setting device for a radiated EMI measurement device according to claim 1, further comprising a horizontal rotation means capable of rotating a specific antenna among the plurality of measurement antennas in the horizontal direction.

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