JP7133829B2 - Antenna Positioner, Unwanted Radiated Electromagnetic Wave Measurement System, and Unwanted Radiated Electromagnetic Wave Measurement Method - Google Patents

Description

The present invention relates to an apparatus and method for measuring unwanted radiation electromagnetic waves generated from electronic equipment.

Unwanted radiated electromagnetic waves from electronic devices cause malfunctions of other electronic devices, so electronic devices are obligated to measure the undesired radiated electromagnetic waves. Unnecessary radiated electromagnetic waves are measured by placing the target equipment in an anechoic chamber or open site and receiving the electromagnetic waves radiated by the equipment under test (EUT) with an antenna. Conventionally, the EUT is placed on a test stand on a turntable, and the angle of polarization of the antenna to be measured (the angle of rotation around the central axis of the received wave of the antenna) is switched between horizontal and vertical. The downward angle of the center axis of the EUT with respect to the horizontal plane) was kept zero, and the turntable was rotated while changing the height of the antenna to measure the entire circumference of the EUT.

However, in recent years, with the miniaturization and speeding up of electronic equipment, the drive frequency of microprocessors and the like has also increased, and the frequency of unnecessary radiation electromagnetic waves generated has also increased. A wideband horn antenna is particularly suitable for measurements in a frequency band of 1 GHz or higher. , it became necessary to increase the depression angle of the antenna and direct the antenna toward the EUT.

In other words, in order to accurately know the maximum level of unwanted radiated electromagnetic waves, it is necessary to perform measurements many times under various conditions while changing the height, depression angle, and polarization angle of the antenna. Therefore, there is a demand for an antenna positioner that can easily and accurately set the height, depression angle, and polarization angle of the antenna. However, it is desirable that the mechanism added for this purpose does not reflect the electromagnetic wave and degrade the measurement accuracy of the unnecessary radiation electromagnetic wave, and that the cost of the antenna positioner does not increase significantly.

Japanese Patent Application Laid-Open No. 2007-58460 JP 2013-117388 A JP 2016-19013 A

According to Patent Document 1, in order to independently adjust the height, elevation angle (depression angle), and polarization angle of the antenna, near the antenna on the antenna base (lifting body) that moves up and down along the guide pole (pillar), A motor for adjusting the elevation angle and a linear actuator for adjusting the polarization angle are provided. Since motors and linear actuators are composed of metal, the metal parts reflect electromagnetic waves and affect measurement, and the metal parts themselves may radiate electromagnetic waves and affect measurement. In addition, since the antenna base moves up and down while the cables for driving the motor and linear actuator hang down from the lift, the cables move erratically, degrading measurement accuracy and hindering the movement of the antenna base. can degrade the angular accuracy of the antenna. In addition, since the antenna base, in which a heavy motor or linear actuator is arranged, is lifted and lowered while being supported only by a single guide pole, the angle of the antenna tends to be unstable due to insufficient strength of the guide pole. In addition, since three driving sources are used in total, a motor for height adjustment, a motor for elevation angle adjustment, and a linear actuator for polarization angle adjustment, the cost is high.

According to Patent Document 2, in order to adjust the height, elevation angle (depression angle), and polarization angle of the antenna, a frame body for attaching the antenna is attached to two elevating bodies that ascend and descend along two pillars (columns). The angle of elevation of the antenna is adjusted according to the height difference between the two elevators, and the antenna is polarized by rotating the antenna support shaft on the frame with a pair of bevel gears that mesh with the rack that ascends and descends on one of the elevators. adjusting the wave angle. Since the pair of bevel gears are arranged immediately behind the antenna and have a large projected area as seen from the antenna, reflection of electromagnetic waves by the gears deteriorates measurement accuracy. Also, when the height and elevation angle of the antenna are adjusted, the bevel gear rotates at the same time and the polarization angle also changes. In addition, since three drive sources are used in total, two servo motors for adjusting the height and angle of elevation, and a servo motor for adjusting the angle of polarization, the cost is high.

According to Patent Document 3, in order to adjust the height, orientation (depression angle), and polarization angle of the antenna, an antenna support is attached to each of two elevating bodies that ascend and descend along two pillars (pillars). Mounting, the direction of the antenna is adjusted according to the height difference between the two lifting bodies, and the linear motion of the air cylinder arranged on one of the supporting bodies is converted into rotary motion by a cam, and the antenna is mounted on the supporting body. The polarization angle of is adjusted. Since this air cylinder is arranged in the immediate vicinity of the antenna, it reflects electromagnetic waves and degrades measurement accuracy. In addition, since the elevating body moves up and down while the tube that supplies air to the air cylinder hangs down from the support, the tube may move unstably, hindering the movement of the antenna and degrading the angular accuracy of the antenna. In addition, since three driving sources are used in total, two servo motors for height and orientation adjustment and a compressor for polarization angle adjustment, the cost is high.

In view of the conventional circumstances as described above, the present invention is designed to improve the height, depression angle, and polarization angle of the antenna attached to the elevating body by simply elevating one elevating body along one column with one motor. can be easily adjusted, and since there is no need to place a member that reflects electromagnetic waves in the immediate vicinity of the antenna, measurement accuracy is excellent. To provide an antenna positioner, an unnecessary radiated electromagnetic wave measuring system, and an unnecessary radiated electromagnetic wave measuring method, which are excellent in stability and can achieve low cost because the driving source is only one motor for lifting and lowering an elevating body.

A first feature of the present invention, which has been made to solve the above problems, has a column, an elevating body that ascends and descends along the column, and an antenna mounting arm, and the antenna mounting arm is the elevating and lowering arm. The antenna positioner is mounted rotatably about a horizontal axis with respect to the body, and the antenna mounting arm rotates according to the elevation of the lifting body.

In the antenna positioner of the first characteristic, the antenna mounting arm attached to the lifting body rotates around the horizontal axis as the lifting body moves up and down along the column. The angle of the antenna can be changed according to the height of the antenna simply by raising and lowering the elevating body.

A second feature is that, in addition to the first feature, an antenna adapter including an antenna mounting portion is disposed on the antenna mounting arm, and when the lifting body is within a predetermined height range, the In the antenna positioner, when the lifting body rises, the antenna mounting arm rotates to increase the angle of depression of the antenna mounting portion.

According to the second feature, since the antenna adapter including the antenna mounting portion is attached to the antenna mounting arm, when the antenna is attached to the antenna mounting portion, the height of the lifting body is within the measurement range of unwanted radiated electromagnetic waves. As the lifting body rises and the antenna becomes higher, the angle of depression of the antenna increases. Therefore, the antenna can be directed substantially toward the device under test regardless of the height of the antenna.

A third feature, in addition to the second feature, is that, within the range of the predetermined heights, the elevation in the vicinity of the measurement heights except for the lowest measurement height among all the determined measurement heights An antenna positioner in which the depression angle change rate of the antenna mounting portion with respect to the height change of the body is larger than the average value of the depression angle change rate of the antenna mounting portion with respect to the height change of the lifting body within the predetermined height range. be.

According to the third feature, the height of the lifting body is determined discretely within the measurement range of the unwanted radiated electromagnetic wave, and the lowest angle of depression of the antenna can be zero. The rate of change in the depression angle of the antenna with respect to the height change of the elevator in the vicinity of the measurement height other than the height is greater than the average value of the rate of change in the angle of depression of the antenna with respect to the height change of the elevator within the measurement range. Therefore, when the antenna is attached to the antenna attachment portion, the elevation angle of the antenna can be changed while keeping the height of the reference point of the antenna substantially constant by raising and lowering the elevating body in the vicinity of the measurement height. You can fine-tune the orientation of the antenna towards the device under test. This makes it possible to measure unwanted radiated electromagnetic waves from the entire device under test even if the device under test has a beam width larger than the antenna beam width. It is also possible to measure in the direction of the source of the radiated electromagnetic waves.

A fourth feature is, in addition to the first feature, a cam plate fixed in the vicinity of the column and having a cam surface of a predetermined shape formed thereon, and a contactor provided on the antenna mounting arm. and wherein the antenna mounting arm rotates by moving the contactor while contacting the cam surface when the lifting body is raised and lowered.

According to the fourth feature, when the lifting body moves up and down, the contactor arranged on the antenna mounting arm moves while being in contact with the cam surface of the cam plate fixed in the vicinity of the column, thereby moving the antenna mounting arm. is rotated, when the antenna is mounted on the antenna mounting portion of the antenna mounting arm, the depression angle of the antenna according to the height of the lifting body can be determined freely, easily and stably by the shape of the cam surface.

A fifth feature is, in contrast to the second feature, an antenna positioner in which the antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm.

According to the fifth feature, the antenna adapter disposed on the antenna mounting arm and including the antenna mounting portion is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm. When the antenna is mounted on the antenna mounting arm via the antenna adapter, the central axis of the antenna mounting part coincides with the central axis of the antenna receiving waves. polarization angle can be switched.

A sixth feature, in addition to the fifth feature, is that when the lifting body is within the predetermined height range and the antenna adapter is at a predetermined rotational position, the lifting body is positioned at the predetermined height. beyond the range to a first height, the antenna adapter rotates, and then when the elevator returns within the predetermined height range, the antenna adapter is a non-rotating antenna positioner.

According to the sixth feature, when the antenna is attached to the antenna mounting arm via the antenna adapter, the height of the lifting body is within the measurement range of the unwanted radiated electromagnetic waves, and the antenna adapter is at a predetermined rotational position. Assuming that the polarization angle is, for example, an angle for measuring vertically polarized electromagnetic waves, when the elevator descends to, for example, a first height that is lower than the measurement range, the antenna adapter rotates and the polarization angle of the antenna changes to a horizontal polarization angle. After switching to the angle for measuring electromagnetic waves, when the elevator rises and returns to the measurement range, the antenna adapter does not rotate and the polarization angle of the antenna is maintained, so the height of the elevator must be changed. It is possible to switch the polarization angle of the antenna simply by

A seventh feature has a pillar, an elevating body that ascends and descends along the pillar, and an antenna adapter including an antenna mounting portion, and the antenna adapter is attached to the elevating body by the antenna mounting portion. and when the antenna adapter is at a predetermined rotational position within a predetermined height range of the lifting body, the lifting body exceeds the predetermined height range and a second When moving to a height of 1, the antenna adapter rotates, and then when the elevator returns within the predetermined range, the antenna adapter is a non-rotating antenna positioner.

According to the seventh feature, since the antenna adapter including the antenna mounting portion is rotatably disposed about the central axis of the antenna mounting portion with respect to the lifting body, the antenna is attached to the lifting body through the antenna adapter. When attached, the polarization angle of the antenna can be switched by rotating the antenna adapter with respect to the elevator. In addition, if the height of the lifting body is within the measurement range of the unwanted radiated electromagnetic waves, and the antenna adapter is at a predetermined rotational position and the antenna is in a posture for measuring vertically polarized electromagnetic waves, for example, the lifting body is lower than the measurement range. When it descends to the first height, the antenna adapter rotates and the antenna switches to a posture for measuring vertically polarized electromagnetic waves. After that, when the lifting body rises and returns to the measurement range, the antenna adapter does not rotate. The attitude of the antenna is maintained. In this way, the polarization angle of the antenna can be switched simply by raising and lowering the elevating body.

An eighth feature, in contrast to the sixth or seventh feature, is that after the lifting body returns to the predetermined height range, the lifting body moves the predetermined height range in the opposite direction from the previous time. direction to a second height, the antenna adapter rotates in the opposite direction, and then when the elevator returns to within the predetermined height range, the antenna adapter does not rotate. is.

According to the eighth feature, for example, after the antenna is switched to a posture for measuring horizontally polarized electromagnetic waves, and the elevating body returns from the first height to within the measurement range, the elevating body moves in the opposite direction to the previous one, e.g. When it rises to a second position higher than the measurement range, the antenna adapter rotates and the antenna switches to a posture for measuring horizontally polarized electromagnetic waves, and then when the lifting body descends and returns to the measurement range, the antenna adapter is Without rotation, the antenna maintains the posture for measuring horizontally polarized electromagnetic waves. In this way, the polarization angle of the antenna can be switched, or switched again to return to the original state, simply by raising and lowering the elevating body.

A ninth feature, in contrast to the sixth or seventh feature, further comprises a switching lever disposed on the antenna adapter, and a lifting body that extends beyond the predetermined height range to the first height. a first switching cam that, when moved, acts on the switching lever to rotate the antenna adapter.

According to the ninth feature, the switching lever disposed on the antenna adapter and the lifting body are fixed at a position where they interfere with the switching lever when moving to the first height beyond the measurement range of the unwanted radiated electromagnetic waves. Since the first switching cam is provided and the first switching cam acts on the switching lever to rotate the antenna adapter, the polarization angle can be reliably switched simply by raising or lowering the elevating body.

A tenth feature, in addition to the eighth feature, is that when the elevating body moves beyond the predetermined height range to the second height, the antenna adapter is operated by acting on the switching lever. An antenna positioner further comprising a rotating second switching cam.

According to the tenth feature, the second switching cam is fixed at a position where it interferes with the switching lever when the lifting body moves beyond the measurement range of the unwanted radiated electromagnetic waves in the opposite direction to the previous one and moves to the second height. Further, since the second switching cam acts on the switching lever to rotate the antenna adapter, the polarization angle can be reliably switched again to return to the original state simply by raising or lowering the elevating body.

An eleventh feature, in addition to the first feature, further includes a motor for raising and lowering the elevator, a detector for detecting a change in height from a predetermined reference height of the elevator, and detection by the detector. a controller that drives the motor based on the result to control elevation of the elevator.

According to the eleventh feature, a motor that raises and lowers an elevating body and, for example, a position where the elevating body comes into contact with a lower stopper is used as a reference. and a controller that drives a motor based on the detection result and controls the lifting body to move up and down to a predetermined height. Cost can be precisely adjusted.

A twelfth feature includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm attached to the elevating body so as to be rotatable about a horizontal axis, and an antenna mounting portion, an antenna adapter attached to the antenna mounting arm so as to be rotatable about the central axis of the antenna mounting portion, and the height of the antenna mounting portion and the height of the antenna mounting portion can be changed by simply raising and lowering the elevating body. The antenna positioner is capable of changing the depression angle of the part and the rotation angle of the antenna mounting part around the central axis.

According to the twelfth feature, the height, depression angle, and rotation angle about the central axis of the antenna mounting portion can be changed simply by raising and lowering the elevating body along the column. Therefore, when the antenna is attached to the antenna mounting portion, the height, depression angle, and polarization angle of the antenna can be changed simply by raising and lowering the elevating body, and a dedicated drive source for changing the depression angle and polarization angle is not required. Therefore, it is possible to reduce the cost of the antenna positioner and easily and accurately measure unwanted radiated electromagnetic waves.

A thirteenth feature is an undesired electromagnetic wave measurement system including a turntable for rotating a device under test, an antenna, and an antenna positioner, wherein the antenna positioner includes a pillar and elevation along the pillar. an elevating body, an antenna mounting arm mounted rotatably about a horizontal axis with respect to the elevating body, and an antenna adapter provided on the antenna mounting arm and including an antenna mounting portion, wherein the antenna is attached to the antenna mounting portion of the antenna positioner, and when the elevating body rises when the elevating body is within a predetermined height range, the antenna mounting arm rotates to increase the depression angle of the antenna. and the antenna is directed toward the device under test at all predetermined measurement heights within the predetermined height range.

According to the thirteenth feature, when the height of the lifting body of the antenna positioner constituting the system is within the measurement range of the unwanted radiated electromagnetic waves of the device under test, when the lifting body rises, the antenna mounting arm attached to the lifting body rotates about the horizontal axis, the angle of depression of the antenna attached to the antenna mounting arm via the antenna adapter increases, and the antenna is positioned in the direction of the device under test at least at a plurality of predetermined measurement heights within the measurement range. Therefore, accurate measurement is possible even when a horn antenna or the like with high directivity is used to measure unwanted radiated electromagnetic waves in the GHz band.

The fourteenth feature, in addition to the thirteenth feature, is that the antenna responds to the height change of the elevator in the vicinity of the measurement heights except for the lowest measurement height among all the determined measurement heights. A depression angle change rate is larger than an average value of depression angle change rates of the antenna with respect to height changes of the elevation body within the predetermined height range, and by raising and lowering the elevation body in the vicinity of the measurement height, This unnecessary radiation electromagnetic wave measurement system enables adjustment of the orientation of the antenna toward the device under test while keeping the height of the reference point of the antenna substantially constant.

According to the fourteenth feature, among all measurement heights discretely determined within the measurement range of the unwanted radiation electromagnetic wave, the height of the lifting body is elevated near the measurement height other than the lowest measurement height. By moving the body up and down, it is possible to adjust the orientation of the antenna toward the device under test while keeping the height of the reference point of the antenna substantially constant. This makes it possible to measure unwanted radiated electromagnetic waves from the entire device under test even if the device under test has a beam width larger than the antenna beam width. It is also possible to measure in the direction of the source of the radiated electromagnetic waves.

A fifteenth feature, in contrast to the thirteenth or fourteenth feature, further comprises that the antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm, and the elevating body When the polarization angle of the antenna is in a predetermined state within a predetermined height range, the antenna adapter rotates when the lifting body moves beyond the predetermined height range to a first height. When the polarization angle of the antenna is switched and then the elevator returns within a predetermined height range, the antenna adapter does not rotate and the polarization angle of the antenna need not be maintained in the switched state. This is a radiated electromagnetic wave measurement system.

According to the fifteenth feature, when the antenna is attached to the antenna mounting portion, the central axis of the received waves of the antenna and the central axis of the antenna mounting portion coincide, so the antenna adapter is rotated around the central axis of the antenna mounting portion. The polarization angle of the antenna can be switched by changing the Assuming that the height of the lifting body is within the measurement range of unwanted radiated electromagnetic waves and the antenna is in a posture for measuring vertically polarized electromagnetic waves, for example, when the lifting body descends to a first height lower than the measurement range, the antenna When the adapter rotates and the antenna switches to the position for measuring horizontally polarized electromagnetic waves, and then the lifting body rises and returns to the measurement range, the antenna adapter does not rotate and the antenna position is maintained. The polarization angle of the antenna can be switched simply by changing the height of the lifting body.

A sixteenth feature is an undesired electromagnetic wave measurement system including a turntable for rotating a device under test, an antenna, and an antenna positioner, wherein the antenna positioner includes a pillar and elevation along the pillar. an antenna mounting arm mounted rotatably about a horizontal axis with respect to the lifting body; and an antenna mounting portion rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm. and an antenna adapter attached to the antenna positioner, wherein the antenna is attached to the antenna attachment portion of the antenna positioner, and the antenna attachment arm rotates and the antenna adapter rotates as the elevator moves up and down. The unwanted radiation electromagnetic wave measuring system is characterized in that the height of the antenna, the depression angle of the antenna, and the polarization angle of the antenna can be changed by raising and lowering the elevating body.

According to the sixteenth characteristic, the antenna mounting arm attached to the elevating body rotates around the horizontal axis in accordance with the elevation of the elevating body of the antenna positioner constituting the system, and the antenna mounting arm is mounted on the antenna mounting arm. The antenna adapter rotates around the central axis of the antenna mounting portion. Therefore, the height, depression angle, and polarization angle of the antenna attached to the antenna attachment arm via the antenna adapter can be changed simply by raising and lowering the elevating body. Since a dedicated drive source for changing the depression angle and polarization angle is not required, a low-cost unwanted radiation electromagnetic wave measurement system can be realized, the angle of the antenna can be easily adjusted, and the electromagnetic wave can be placed near the antenna on the elevator. Unnecessary radiated electromagnetic waves can be accurately measured because there is no need to arrange a reflecting member.

A seventeenth feature is a method for measuring unwanted radiation electromagnetic waves from a device under test using a turntable for rotating the device under test, an antenna, and an antenna positioner, wherein the antenna positioner comprises a column, an elevating body that ascends and descends along the pillar; an antenna mounting arm that is attached to the elevating body so as to be rotatable about a horizontal axis; and an antenna adapter that is disposed on the antenna mounting arm and includes an antenna mounting portion. , wherein the antenna is mounted on the antenna mounting portion of the antenna positioner, and when the lifting body is within a predetermined height range, the antenna mounting arm rotates when the lifting body rises. The angle of depression of the antenna is increased, and the antenna is oriented in the direction of the device under test at all predetermined measurement heights within the predetermined height range, and the lifting body is raised and lowered. is a method of measuring unwanted radiated electromagnetic waves by directing the antenna toward the device under test at all the determined measurement heights.

According to the method for measuring unwanted radiated electromagnetic waves of the seventeenth feature, when the height of the lifting body is within the measurement range of the undesired radiated electromagnetic waves of the device under test, the antenna positioner used for the measurement has a height of the lifting body. The antenna mounting arm mounted on the antenna rotates about the horizontal axis, and the depression angle of the antenna mounted on the antenna mounting arm via the antenna adapter increases, and at least a plurality of predetermined measurement heights within the measurement range, The antenna is oriented in the direction of the device under test. Using this antenna positioner, the antenna can be oriented in the direction of the device under test by raising and lowering the lifting body within the measurement range of the unwanted radiation electromagnetic waves of the device under test. Since the measurement is directed toward the target, accurate measurement is possible even when a horn antenna or the like with high directivity is used to measure unwanted radiation electromagnetic waves in the GHz band. Also, with this method, just by changing the height of the antenna, the angle of depression automatically changes so that it points in the direction of the device under test. Even when measuring repeatedly while changing the angle of depression, there is no need to worry about the wrong combination of height and angle of depression.

In the eighteenth feature, in contrast to the seventeenth feature, the antenna positioner responds to height changes of the elevator in the vicinity of the measurement heights except for the lowest measurement height among all the determined measurement heights. A rate of change in angle of depression of the antenna is larger than an average value of rate of change in angle of depression of the antenna with respect to changes in height of the elevator within the predetermined height range. The method for measuring unwanted radiated electromagnetic waves according to the seventeenth characteristic, wherein the orientation of the antenna toward the device under test is measured while the height of the reference point of the antenna is kept substantially constant by moving the body up and down.

According to the eighteenth characteristic, the antenna positioner used for measurement has an elevation angle of depression at least at the lowest of all measurement heights discretely determined within the measurement range of the unwanted radiation electromagnetic wave. is greater than the average value of the antenna depression angle change rate for height changes of the elevator within the measurement range. . Therefore, by raising and lowering the lifting body in the vicinity of the measurement height, it is possible to adjust the direction of the antenna toward the device under test by changing the depression angle of the antenna while keeping the height of the reference point of the antenna substantially constant. can be done. As a result, even if the device under test is larger than the beam width of the antenna, measurement can be performed by scanning the electromagnetic waves emitted from the entire device under test. It is also possible to measure in the direction of the radiation source of unwanted radiation electromagnetic waves.

A nineteenth feature is, in contrast to the seventeenth or eighteenth feature, further, in the antenna positioner, the antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm, When the lifting body moves to a first height beyond the predetermined height range when the polarization angle of the antenna is in a predetermined state within the predetermined height range, the antenna When the adapter rotates to switch the polarization angle of the antenna, and then the elevator returns to within a predetermined height range, the antenna adapter does not rotate and the polarization angle of the antenna is switched. When the polarization angle of the antenna is in a predetermined state, the lifting body is moved to the first height to switch the polarization angle of the antenna, thereby switching the polarization angle. This is a method for measuring unwanted radiated electromagnetic waves in which the antenna is directed toward the device under test at all the measurement heights determined before and after.

According to the nineteenth characteristic, the antenna positioner used for measurement can switch the polarization angle of the antenna by rotating the antenna adapter with respect to the antenna mounting arm around the central axis of the antenna mounting portion. When the height of the lifting body is within the measurement range of the unwanted radiated electromagnetic wave and the antenna is in a posture for measuring the electromagnetic wave of either vertical or horizontal polarization, the first height of the lifting body is lower or higher than the measurement range. When it reaches the height, the antenna adapter rotates and the antenna switches to a posture for measuring electromagnetic waves of the other polarization. Since the posture for measuring the electromagnetic wave of the other polarized wave is maintained, the polarization angle of the antenna can be switched simply by changing the height of the elevating body. Therefore, when the polarization angle of the antenna is in either state, the antenna is oriented in the direction of the device under test at all the determined measurement heights, and after measuring the unwanted radiated electromagnetic waves, the lifting body is moved to the first position. height to switch the polarization angle of the antenna to the other state, and measure with the antenna pointing in the direction of the device under test at all determined measurement heights to obtain both horizontal and vertical polarization. Unwanted radiation electromagnetic waves can be efficiently measured.

A twentieth feature is a method for measuring unwanted radiated electromagnetic waves from a device under test using a turntable for rotating the device under test, an antenna, and an antenna positioner,
The antenna positioner includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm attached to the elevating body so as to be rotatable about a horizontal axis, and an antenna mounting portion. an antenna adapter mounted rotatably about the center axis of the antenna mounting portion with respect to the mounting arm, wherein the antenna is mounted on the antenna mounting portion of the antenna positioner, The antenna mounting arm rotates and the antenna adapter rotates, and the height of the antenna, the angle of depression of the antenna, and the angle of polarization of the antenna are changed by raising and lowering the elevator. This is a method for measuring unwanted radiated electromagnetic waves.

According to the twentieth feature, the antenna mounting arm attached to the elevating body rotates around the horizontal axis in accordance with the elevation of the elevating body of the antenna positioner used for measurement, and the antenna mounting arm is mounted on the antenna mounting arm. The antenna adapter rotates around the central axis of the antenna mounting portion. Therefore, the height, depression angle, and polarization angle of the antenna attached to the antenna attachment arm via the antenna adapter can be changed simply by raising and lowering the elevating body, and the unwanted radiated electromagnetic waves from the device under test can be measured. Since the height, depression angle and polarization angle of the antenna can all be changed simply by raising and lowering the elevator, it is easy to adjust the antenna during measurement and errors in measurement are less likely to occur. Moreover, since there is no need to dispose a member that reflects electromagnetic waves near the antenna on the lifting body, unnecessary radiated electromagnetic waves can be measured with high accuracy.

The antenna positioner of the present invention can easily change the height, depression angle, and polarization angle of the antenna according to the height of the elevating body simply by raising and lowering the elevating body. Moreover, since there is no member that reflects electromagnetic waves in the vicinity of the antenna on the lifting body, the measurement accuracy is excellent. Moreover, since no drive source other than the motor for raising and lowering the lifting body is required, the cost is low.

1A and 1B are a front view and a right side view of an antenna positioner, respectively, illustrating an outline of an unwanted radiation electromagnetic wave measuring system including an antenna positioner according to an embodiment of the present invention; FIG. 4 is a perspective view showing the configuration of the lifting section of the antenna positioner according to the embodiment of the present invention; FIG. 4 is a perspective view illustrating the movement of the antenna positioner according to the embodiment of the present invention when measuring a vertically polarized unwanted radiation electromagnetic wave. FIG. 5 is a perspective view illustrating the movement when switching the polarization angle of the antenna attached to the antenna positioner according to the embodiment of the present invention from vertical polarization to horizontal polarization. FIG. 4 is a perspective view illustrating the movement of the antenna positioner according to the embodiment of the present invention when measuring a horizontally polarized unwanted radiated electromagnetic wave; FIG. 5 is a perspective view illustrating the movement when switching the polarization angle of the antenna attached to the antenna positioner according to the embodiment of the present invention from horizontal polarization to vertical polarization. 4 is a flow chart showing a method for measuring unwanted radiated electromagnetic waves according to an embodiment of the present invention; 4 is a block diagram showing the configuration of the control section of the antenna positioner according to the embodiment of the present invention; FIG. FIG. 5 is a front view illustrating an overview of an unwanted radiation electromagnetic wave measurement system including an antenna positioner according to a second embodiment of the present invention; FIG. 10 is a front view illustrating an outline of an unwanted radiation electromagnetic wave measuring system including an antenna positioner according to a third embodiment of the present invention, and a right side view of the antenna positioner; It is a schematic diagram explaining the operation|movement of the antenna positioner which concerns on the 4th Embodiment of this invention compared with 1st Embodiment. FIG. 11 is a schematic diagram illustrating the operation of the first modified example of the antenna positioner according to the fourth embodiment of the present invention; FIG. 11 is a schematic diagram illustrating the operation of the second modified example of the antenna positioner according to the fourth embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an antenna positioner, an unwanted radiation electromagnetic wave measuring system, and an unwanted radiation electromagnetic wave measuring method of the present invention will be described below with reference to the drawings.
(Example 1)
FIG. 1(a) is a front view of an unwanted radiation electromagnetic wave measuring system 40 including an antenna positioner 1, and FIG. 1(b) is a side view of the antenna positioner 1. FIG.
A device under test (EUT) 41 is placed on a test stand 43 on a rotatable turntable 42 . Further, the antenna 31 is attached to the antenna positioner 1, and while the height, depression angle and polarization angle of the antenna 31 are changed by the antenna positioner 1, and while the installation angle of the EUT 41 is changed by the turntable 42, unnecessary radiation electromagnetic waves from the EUT 41 are emitted. is measured. FIG. 1 is a schematic diagram showing a superimposed state in which the antenna 31 is moved to two upper and lower measurement heights of unnecessary radiation electromagnetic waves, and there is actually one antenna 31 .

Antenna 31 in FIG. 1 is a broadband horn antenna suitable for measuring electromagnetic waves of 1 GHz or higher, but has sharp directivity. Therefore, antenna 31 must be directed toward EUT 41 when measuring unwanted radiation electromagnetic waves. Therefore, the higher the antenna 31 is than the EUT 41 , the greater the angle of depression α of the antenna 31 and the antenna 31 is oriented toward the EUT 41 . At this time, at each measurement height above and below the antenna 31, the main radiation source of unnecessary radiation electromagnetic waves in the EUT 41 should be within the range of 3 dB beam width (half power beam width) θ of the main lobe of the antenna 31. do it. Further, it is even better if the entire EUT 41 is kept within the range of the 3 dB beam width θ of the antenna 31 at each measurement height of the antenna 31 .

The horn antenna 31 in FIG. 1 is in the posture for measuring electromagnetic waves of vertically polarized waves (electromagnetic waves whose electric field is vertical to the ground). At each measurement height of the antenna 31, the main radiation source of the unwanted radiation electromagnetic wave in the EUT 41 is in the direction perpendicular to the illustrated should be within the range of 3 dB beam width. Further, at each measurement height of the antenna 31, it is further preferable that the entire EUT 41 is within the range of the 3 dB beam width of the antenna 31 in the illustrated direction orthogonal to θ.

Next, the configuration and operation of the antenna positioner 1 will be described with reference to FIG. A pillar 2 is erected on a carriage 10 of the antenna positioner 1, and an elevating body 3 is attached along the pillar 2 so as to be vertically movable. A motor 12 and a speed reduction mechanism 13 (not shown) are arranged inside the driving device 11 on the carriage 10 . The motor 12 is connected to a drive pulley 16 via a reduction mechanism 13 , and a timing belt 18 is stretched between the drive pulley 16 and a driven pulley 17 on the top of the column 2 . Since the timing belt 18 is connected to the lifting body 3 by the belt retainer 19, when the motor 12 is rotated forward/reverse, the timing belt 18 rotates in the forward and reverse directions, and the lifting body 3 moves up and down along the column 2. do.

An antenna attachment arm 4 is attached to an elevating body 3 that ascends and descends along a column 2 so as to be rotatable about a horizontal axis 4H. A cam plate 6 having a cam surface 6</b>C of a predetermined shape is fixed to the column 2 by a plurality of cam plate fixing portions 7 near the column 2 . When the elevator 3 moves up and down, the contactor 9 on the antenna mounting arm 4 moves while being in contact with the cam surface 6C of the cam plate 6, so that the antenna mounting arm 4 rotates according to the shape of the cam surface 6C. .
An antenna adapter 5 including an antenna mounting portion 5M is arranged on the antenna mounting arm 4. As shown in FIG. The antenna mounting portion 5M of the antenna adapter 5 is orthogonal to the horizontal axis 4H, and the depression angle of the antenna mounting portion 5M of the antenna adapter 5 changes when the antenna mounting arm 4 rotates around the horizontal axis 4H. The shape of the cam surface 6C is set so that the angle of depression of the antenna mounting portion 5M increases as the elevating body 3 rises within the range of the measurement height of the unnecessary radiated electromagnetic waves at two predetermined points. The center axis of the antenna mounting portion 5M is directed substantially toward the EUT 41 at the two measurement heights. Since the center axis of the antenna mounting portion 5M is aligned with the center axis of the wave reception of the antenna 31 when the antenna 31 is mounted, when the antenna 31 is mounted on the antenna mounting portion 5M, at two predetermined measurement heights, Antenna 31 is directed substantially toward EUT 41 .

In FIG. 1, when the lifting body 3 and the antenna 31 are located below and above the column 2, the measurement heights of the unwanted radiated electromagnetic waves are at two predetermined points. When the elevator 3 and the antenna 31 are above, the center axis of the antenna 31 is inclined by the depression angle α, and the antenna 31 is closer to the EUT 41 with respect to the rotation center 4C of the antenna arm 4 on the elevator 3. Therefore, the difference in height of the lifting body 3 is greater than the difference in height of the antenna 31 between the two measurement heights. Since the difference can be obtained by a simple calculation, for example, when it is desired to raise the reference point such as the feed point of the antenna 31 by 1 m from the lower position, the lifting body 3 is moved by a necessary amount larger than 1 m based on the calculation result. should be raised.
Here, the phrase "within two predetermined measurement height ranges of unnecessary radiation electromagnetic waves" means that the lifting body 3 and the antenna 31 are each within two upper and lower measurement height ranges in FIG. The height of the lifting body 3 and the height of the antenna 31 are specified and distinguished only when necessary.

Next, with reference to FIG. 2, the configuration of the elevating section including the elevating body 3 that elevates along the column 2 will be described. FIG. 2 is a perspective view of the elevating unit as seen obliquely from below. At the left end of the lifting body 3, there is a substantially square frame-like portion into which the column 2 having a substantially square cross section is inserted, and a total of 16 rollers 3R, four rollers 3R arranged on each surface, are rotatably attached. ing. When the elevating body 3 ascends and descends, the roller 3R rotates with respect to the column 2, so that the elevating body 3 can move up and down smoothly. The right side of the frame portion has a notch portion 3C for avoiding interference with the cam plate fixing portion 7, and an upper reinforcing portion 3U is provided to eliminate the insufficient strength of the lifting body 3 including the frame portion. A lower reinforcing portion 3D is provided to prevent deformation of the lifting body 3 and deformation of the antenna mounting arm 4 attached to the lifting body 3 as well.

The antenna mounting arm 4 has branching portions 4D branched to both sides to avoid interference with the cam plate 6 and the cam plate mounting portion 7 that pass through the elevating portion during elevation. The pivot centers 4C are provided at opposing positions on both sides of the branch portion 4D. The axis connecting the two rotation centers 4C on both sides is a horizontal axis 4H that becomes horizontal when the elevating body 3 is attached to the column 2, and the antenna mounting arm 4 rotates about the horizontal axis 4H with respect to the elevating body 3. becomes movable.
A contactor 9 that moves while being in contact with the cam surface 6C of the cam plate 6 during elevation is provided at the tip of the branch 4D of the antenna mounting arm 4. As shown in FIG. The contactor 9 is pressed against the cam surface 6</b>C of the cam plate 6 by the rotational moment of the antenna mounting arm 4 about the horizontal axis 4</b>H caused mainly by the weight of the antenna mounting arm 4 and the antenna 31 . In order to make the lifting operation of the lifting section smooth, the contactor 9 should be of a roller shape and should be rotatably mounted.

Further, the antenna mounting arm 4 includes a bent portion 4B, and when the elevating portion is viewed from the side of the EUT 41, the antenna adapter 5 is positioned not in front of the column 2 inserted into the substantially rectangular frame portion of the elevating body 3, but in the column. An antenna 31 which is arranged beside the body 2 and is attached to the antenna attachment portion 5M of the antenna adapter 5 is also arranged beside the columnar body 2. As shown in FIG. This prevents the antenna adapter 5 and the like from interfering with the antenna mounting arm 4 and the like. Since the distance between the horizontal rotation shaft 4H and the antenna mounting portion 5M in the central axis direction of the antenna 31 can be reduced, the lifting portion can be made smaller, and the antenna mounting arm 4 rotates to increase the depression angle of the antenna 31. The height difference between the lifting body 3 and the antenna 31 is also reduced. For example, by changing the shape of the antenna mounting arm 4 and setting the distance in the antenna axial direction between the reference point such as the feeding point of the antenna 31 and the horizontal rotation shaft 4H to zero, even if the antenna mounting arm 4 rotates, The height of the reference point of the antenna 31 with respect to the lifting body 3 may be kept unchanged.
It goes without saying that the lifting body 3, the antenna mounting arm 4, and the like need not be individual parts, and may be constructed by assembling a plurality of parts as shown in FIG.

As described above, according to the antenna positioner 1 of FIG. 1, the depression angle of the antenna 31 can be changed according to the height of the antenna 31 simply by moving the elevating body 3 up and down to a predetermined measurement height. , the antenna 31 can be directed toward the EUT 41 . Therefore, even when a horn antenna with high directivity is used as the antenna 31, the unwanted radiated electromagnetic waves from the EUT 41 can be easily measured.
Depending on the shape of the cam surface 6C of the cam plate 6, the depression angle of the antenna 31 can be changed relatively freely according to the height of the antenna 31. It is also possible to direct the antenna 31 toward the EUT 41 at these heights or at all heights. This makes it possible to easily measure unnecessary radiation electromagnetic waves from the EUT 41 even under various height conditions.

The size and shape of the EUT 41 are of course not fixed. The 3 dB beam width θ of the antenna 31 used for measurement also varies depending on the specifications of the antenna and is not fixed. Even if the antenna 31 is directed toward the EUT 41, the main radiation source of the unwanted radiation electromagnetic waves in the EUT 41 or the entire EUT 41 only needs to be within the range of the 3 dB beam width of the antenna 31. The value of the depression angle when the point is at a predetermined height is also not uniformly determined, and there is a certain degree of freedom. Therefore, according to the beam width of the antenna 31 to be used, the EUT 41 with the size and shape that are frequently used for measurement can be accommodated within the beam width, and the EUT 41 with various sizes and shapes as much as possible can be accommodated within the beam width. The depression angle of the antenna 31 should be set so as to fit. Since the EUT 41 is often installed on the upper surface of the test table 43 at a height of 0.8 m from the ground plane, the rotation center axis of the turntable 42 is 0.8 m from the upper surface of the test table or slightly higher than the ground plane. If the central axis of the beam of the antenna 31 is positioned at a height of about 1.2 m, versatility is often enhanced.
However, if the EUT 41 is too large to fit within the 3 dB beam width of the antenna 31, the antenna 31 may be replaced with one with slightly weaker directivity, or the distance between the antenna 31 and the EUT 41 may be increased, for example, from the usual 3 m.

Further, the cam plate 6 may be replaced with one having a different shape of the cam surface 6C to change the depression angle of the antenna 31 so that the EUT 41 fits within the beam width θ according to the size and shape of each EUT 41 . Since the cam plate 6 is divided into upper and lower parts, it can be easily replaced while the elevating body 3 is attached to the column 2. - 特許庁Also, the angle of depression of the antenna 31 may be changed by adjusting the mounting position of the cam plate 6 up and down or back and forth.
It should be noted that the cam plate 6 may be divided into a large number of pieces instead of the upper and lower two pieces. For example, when there are four predetermined measurement heights of unnecessary radiation, the measurement height may be divided into four. Accordingly, by adjusting the position of the cam plate 6 corresponding to each measurement height, the depression angle of the antenna 31 can be adjusted for each measurement height. Conversely, the cam plate 6 may be composed of one piece without being divided. To eliminate a notch part 3C in a substantially square frame-shaped part of an elevating body 3 by fixing an integral cam plate 6 to a column body 2 only at two places at upper and lower ends and eliminating a cam plate fixing part 7 in an intermediate part. can be done. As a result, the strength of the lifting body 3 can be increased, and the weight of the lifting body 3 can be reduced.

The method for changing the depression angle according to the height of the antenna 31 by raising and lowering the elevating body 3 has been described above. Hereinafter, a method for switching the polarization angle according to the height of the antenna 31 by raising and lowering the elevating body 3 will be described.

In FIG. 2, the antenna adapter 5 including the antenna mounting portion 5M is attached to the antenna mounting arm 4 so as to be rotatable about the central axis of the antenna mounting portion 5M. Further, the antenna mounting shaft at the rear end of the antenna 31 is inserted into the pipe-shaped antenna mounting portion 5M, and is fixed with a screw from the side in a fitted state. At this time, the central axis of the antenna mounting portion 5M coincides with the central axis of the wave reception of the antenna 31, and by rotating the antenna adapter 5 with respect to the antenna arm 4, the polarization angle of the antenna 31 can be switched. . A switching lever 22 is attached to the antenna adapter 5, and by rotating a portion of the switching lever 22 far from the rotation center of the antenna 31, the polarization angle of the antenna 31 can be switched with a light force.
Since the shape of the antenna mounting portion 5M is determined according to the shape of the fitting portion on the antenna 31 side, it does not have to be a simple pipe shape. and the central axis of the antenna mounting portion 5M can be easily matched.
Further, the antenna adapter 5 may be locked to the antenna mounting arm 4 with a light force at the position where the polarization angle of the antenna 31 is horizontal and vertical. As a result, it is possible to prevent the polarization angle from being deviated due to vibration or the like that accompanies the lifting and lowering of the lifting body 3 . A ball plunger or a resin spring may be used as the locking mechanism to provide a click feeling. When using a ball plunger, it is better to select a plastic plunger that does not use metal. In this case, the switching lever 22 should be arranged at a position where the operation is stable in consideration of the force required for unlocking.

1, a lower stopper 20 and an upper stopper 21 are provided at the lower end and the upper end of the column 2, respectively. A first switching cam 23 is provided at the bottom of the column 2, and a second switching cam 24 is provided at the top. These two switching cams do not come into contact with the switching lever 22 attached to the antenna adapter 5 when the elevating body 3 moves up and down within the measurement range of the two undesired radiation electromagnetic waves shown in the drawing. When the body 3 descends beyond the measurement range, the first switching cam 23 acts on the switching lever 22 to rotate the antenna adapter 5 and the polarization angle of the antenna 31 is switched.

Next, a mechanism for switching the polarization angle of the antenna 31 and a method for measuring the unwanted radiation electromagnetic wave by switching the polarization angle when measuring the unwanted radiation electromagnetic wave will be described with reference to FIGS. 3 to 6. FIG.
In FIG. 3, the antenna 31 is a horn antenna, and is assumed to be in a posture during measurement of vertically polarized electromagnetic waves. In FIG. 3(a), the lifting body 3 is at the lower limit measurement height of the predetermined measurement range of the unwanted radiated electromagnetic wave, and in FIG. 3(b) it is at the upper limit measurement height. By moving the elevator 3 up and down within this range, the height and depression angle of the antenna 31 are changed at the same time. Measure unwanted radiated electromagnetic waves. Although the measurement is performed while raising the elevating body 3 from below, it may be measured while lowering it from above.

The state shown in FIG. 4A, in which the measurement of the vertically polarized unnecessary radiated electromagnetic wave is completed, and the lifting body 3 is returned to the lower measurement height of the measurement range while the antenna 31 remains in the posture during the measurement of the vertically polarized electromagnetic wave. 4B, where the lifting body 3 contacts the lower stopper 20 outside the range of the measurement height, the switching lever 22 is pushed by the first switching cam 23. The antenna adapter 5 is rotated by 90 degrees, and the antenna 31 attached to the antenna attachment portion 5M of the antenna adapter 5 is switched to the posture for measuring the horizontally polarized electromagnetic wave. It should be noted that the polarization angle may be switched at a predetermined height slightly before the elevator body 3 descends out of the measurement range and abuts on the lower stopper 20 .
In the above example, the elevating body 3 is lowered to a position where the elevating body 3 contacts the lower stopper 20 outside the measurement height range, and the antenna adapter 5 is rotated to switch the polarization angle of the antenna 31. Alternatively, the elevating body 3 may be raised to a position outside the range of the measurement height where the elevating body 3 abuts against the upper stopper 21 , and the antenna adapter 5 may be rotated to switch the polarization angle of the antenna 31 .

After the elevator 3 is lowered until it abuts against the lower stopper 20 outside the measurement range, and the antenna 31 switches from the vertically polarized wave to the horizontally polarized electromagnetic wave measurement posture, the elevator 3 is lifted again. Since the switching cam 23 and the switching lever 22 of No. 1 simply move away from each other and do not interfere with each other, even if the lifting body 3 is returned to the range of the measurement height of the unnecessary radiation electromagnetic wave, the antenna 31 remains in the posture during the measurement of the horizontally polarized electromagnetic wave. to maintain FIG. 5(a) shows the case where the elevator 3 is at the lower limit of the measurement range, and FIG. 5(b) shows the case when it is at the upper limit of the measurement range. At the same time, the antenna 31 is directed toward the EUT 41 at least at a predetermined measurement height within the measurement range, and the unwanted radiated electromagnetic waves of horizontal polarization are measured.
Also, by rotating the antenna 31 by 90 degrees with respect to the antenna mounting portion 5M of the antenna adapter 5, the unwanted radiated electromagnetic waves of horizontal polarization are first measured within the measurement range, and then the elevating body 3 is moved out of the measurement range. The antenna 31 may be lowered to rotate 90 degrees so as to assume a posture for measuring the vertically polarized electromagnetic wave, and then the unnecessary radiated electromagnetic wave of the vertically polarized wave may be measured.

According to the above procedure, the antenna 31 can be switched from the posture for measuring the vertically polarized electromagnetic wave to the posture for measuring the horizontally polarized electromagnetic wave by simply moving the elevating body 3 up and down. The measurement of the unwanted radiated electromagnetic waves in the polarization direction of is completed. Although the measurement can be completed at this point, if the polarization angle of the antenna 31 can be returned to the vertical polarized electromagnetic wave measurement posture after that, the degree of freedom in the unnecessary radiation electromagnetic wave measurement procedure will be further expanded and convenience will be enhanced. To improve, the method is described below.

FIG. 5(b) shows a state in which the measurement of the unwanted radiated electromagnetic waves of horizontal polarization is completed, the antenna 31 is in the posture of the measurement of the horizontal polarized electromagnetic waves, and the lifting body 3 is at the upper measurement height within the measurement range. FIG. 6(a) shows a state in which the elevating body 3 is slightly raised beyond the measurement range in the direction opposite to the previous switching of the polarization angle from this state, and the cam surface 6C of the cam plate 6 is Outside the measurement range, the antenna mounting arm is rotated in the direction opposite to that within the measurement range in accordance with the rise of the lifting body 3 to return the depression angle of the antenna 31 to zero. Next, when the elevating body 3 is further raised from this state to the position shown in FIG. 6B where it contacts the upper stopper 21, the switching lever 22 is pushed by the second switching cam 24 and the antenna adapter 5 is rotated by 90 degrees. As a result, the antenna 31 attached to the antenna attachment portion 5M of the antenna adapter 5 can be returned to the initial orientation during measurement of the vertically polarized electromagnetic wave.

It should be noted that the polarization angle may be switched at a predetermined height slightly before the elevator body 3 rises out of the measurement range and abuts the upper stopper 21 . Further, the method of returning the depression angle of the antenna 31 to zero outside the measurement range is not limited to the method of using the cam surface 6C of the cam plate 6, and a dedicated mechanism may be added. Further, without returning the depression angle of the antenna 31 to zero, the antenna adapter 5 and the switching lever remain in a tilted state. may be applied to rotate the antenna adapter 5 .

The lifting body 3 is lifted from within the measurement range until it abuts against the upper stopper 21 outside the measurement range, and the antenna 31 is returned from the attitude when measuring the horizontally polarized electromagnetic wave to the first attitude when measuring the vertically polarized electromagnetic wave. After that, when the lifting body 3 is reversed and lowered from the state of FIG. , the antenna 31 maintains the attitude at the time of measuring the vertically polarized electromagnetic wave. In this way, the state of the antenna 31 can be returned to the initial state shown in FIG.
As described above, according to the present invention, the polarization angle of the antenna 31 can be freely switched from vertical to horizontal and vice versa simply by moving the elevating body 3 up and down, and efficient and highly flexible measurement can be performed. can be done.

FIG. 7 is a flow chart showing the procedure for measuring unwanted radiated electromagnetic waves. First, the antenna 31 is set in a posture for measuring vertically polarized electromagnetic waves, and measurement is started (Step 1). Next, when the lifting body 3 is moved up and down to move the reference point of the antenna 31 to one of a plurality of predetermined measurement heights within the measurement range of the unwanted radiation electromagnetic waves, the depression angle of the antenna 31 is changed at the same time. Therefore (Step 2), the measurement of unwanted radiation electromagnetic waves is performed with the antenna 31 directed toward the EUT 41 (Step 3). Next, it is confirmed whether or not the measurement of the unnecessary radiated electromagnetic waves of vertical polarization is completed at all of the predetermined measurement heights (Step 4). The height and depression angle are changed (Step 2), and this is repeated until the measurement of the unwanted radiated electromagnetic waves at all measurement heights is completed. If the measurement of unnecessary radiation electromagnetic waves of vertical polarization is completed at all measurement heights (Step 4), the lifting body 3 is moved to the first height outside the measurement range of the unnecessary radiation electromagnetic waves, and the antenna 31 is horizontally polarized. The posture is switched to that for electromagnetic wave measurement (Step 5).

When the attitude of the antenna 31 is switched to that used for measuring horizontally polarized electromagnetic waves, the measurement of undesired electromagnetic waves of horizontally polarized waves is started (Step 6). When the elevating body 3 is lifted and returned to the measurement range, and the reference point of the antenna 31 is moved to one of a plurality of predetermined measurement heights within the measurement range of the unwanted radiation electromagnetic waves, the depression angle of the antenna 31 is simultaneously measured. Since it is changed (Step 7), unnecessary radiation electromagnetic waves are measured with the antenna 31 directed toward the EUT 41 (Step 8). Next, it is confirmed whether or not the measurement of the unnecessary radiation electromagnetic waves of the horizontal polarization at all of the predetermined measurement heights has been completed (Step 9). The height and the angle of depression are changed (Step 7), and this is repeated until the measurement of unnecessary radiation electromagnetic waves at all measurement heights is completed. If the horizontal polarization unwanted radiation measurement is completed at all of the predetermined measurement heights (Step 9), the vertical and horizontal polarization unwanted radiation measurement ends (Step 10).

According to the antenna positioner 1 of FIG. 1 , the polarization angle of the antenna 31 is changed to, for example, vertical by moving the elevating body 3 to a first height on one side outside the predetermined measurement height range of the unwanted radiation electromagnetic wave. to the horizontal (or from the horizontal to the vertical), and then move the elevating body 3 to a second height on the other side outside the range of the predetermined measurement height of the unnecessary radiated electromagnetic wave, so that the polarization angle of the antenna 31 can be switched, for example, from horizontal to vertical (or from vertical to horizontal) and back to the original polarization angle. According to this, since the polarization angle of the antenna 31 can be freely switched any number of times, the degree of freedom in measurement is greatly improved, and it is also possible to re-measure only specific conditions after a series of measurements is completed. . However, the function of moving to the second height to restore the polarization angle may be omitted. Nevertheless, as shown in the flow chart of FIG. 7, it is possible to measure the unwanted radiated electromagnetic waves of both vertical and horizontal polarized waves under all necessary conditions. For example, the overall height of the antenna positioner 1 can be reduced by omitting the polarization angle switching function above the measurement range.

As described above, according to the antenna positioner 1 of FIG. 1, the height, depression angle, and polarization angle of the antenna 31 above the elevator can be changed simply by raising and lowering the elevator 3 . In measurement of unwanted radiation electromagnetic waves, the height of a reference point such as the feeding point of the antenna 31 is often specified. When the height and depression angle of the reference point of the antenna 31 at the time of measurement are determined, and the position of the reference point of the antenna 31 with respect to the rotation center 4C of the antenna mounting arm 4 is determined, the height of the lifting body 3 is determined. The reference point of the antenna 31 can be positioned at a given height simply by positioning it at a given height from the ground plane. The reference point of the antenna 31 is not limited to the feeding point, and may be selected from the center of the opening surface of the antenna 31, the center of the abutting surface when the antenna 31 is attached, the rotation center of the antenna mounting arm, and the like. However, regardless of the definition of the reference point, the reference point of the antenna 31 can be positioned at a predetermined height by positioning the elevator 3 at a height calculated from the position of the reference point.

Next, a method for positioning the lifting body 3 at a predetermined height from the ground plane will be described. FIG. 8 is a block diagram showing the configuration of the control section of the antenna positioner 1. As shown in FIG. A motor 12 in the driving device 11 is connected to a driving pulley 16 via a reduction mechanism 13 , and a timing belt 18 is stretched between the driving pulley 16 and the driven pulley 17 . The timing belt 18 is fixed to the elevating body 3 , and the elevating body 3 moves up or down along the column 2 between the lower stopper 20 and the upper stopper 21 depending on the rotation direction of the motor 12 . Therefore, in order to position the elevating body 3 at a predetermined height H from the ground plane with reference to the height Ho of the elevating body 3 when it hits the lower stopper 20, for example, the position of the reference height Ho Then, the lifting body 3 is lifted by the height difference ΔH and then stopped. In order to first stop the lifting body 3 at the reference height Ho, for example, a limit switch may be arranged at the reference height and the timing of turning on or off of the switch may be determined, or a small motor current may be used. The lifting body 3 may be moved in the direction of the lower stopper 20 and determined at the stopped position. The height of the lifting body 3 when it hits the upper stopper 21 may be used as a reference.

The drive device 11 further includes a rotation detector 32 that detects the amount of rotation of the motor 12 and a controller 15 that drives and controls the motor 12 so as to move the elevator 3 to the height indicated by the operation unit 35 . Since the motor 12 is directly connected to the lifting body 3 via the reduction mechanism 13 and the like, the height of the lifting body is detected based on the amount of rotation of the motor 12 detected by the rotation detection unit 32 when the lifting body 3 rises from Ho. The unit 14 detects the height of the elevator 3, and the control unit 33 drives and controls the motor 12 via the motor drive circuit 34 to move the elevator to the height H and stop.
Note that the operation unit 35 may include a display unit, and the display unit may display the height, depression angle, and polarization angle of the antenna 31 .

Although the type of motor 12 is not limited, a brushless DC motor is suitable, for example. Since a Hall element is provided for detecting the position of the rotor and changing the polarity of the drive current, if this Hall element is also used as the rotation detection unit 32 of the motor 12, a dedicated optical sensor or the like becomes unnecessary, resulting in low cost. In addition, it is possible to detect the rotation amount of the motor with high accuracy. It is also superior to brushed motors in terms of electromagnetic noise and service life. Instead of the hall element incorporated in the motor 12, an optical element such as a photoreflector may be used to detect the rotation of the drive pulley 16 or the like to detect the height of the lifting body 3. FIG.

Further, in the antenna positioner 1 of FIG. 1, in order to prevent the reflection of electromagnetic waves that are harmful to the measurement, the column 2, the lifting body 3, the antenna mounting arm 4, the antenna adapter 5, and the cam exposed in the vicinity of the antenna 31 are provided. The plate 6, the cam plate fixing portion 7, the belt 18, the switching lever 22, etc. are all made of resin. Glass fiber reinforced resin, foamed resin, or the like may be used depending on the specifications of each part, but it is desirable not to use metal parts, and bolts, nuts, and the like are all made of resin. When ball bearings are used in the roller part, etc., it is preferable to use ceramic bearings. In addition, the driving device 11, which is fixed on the carriage 10 and includes the motor 12 and the like, should be shielded with, for example, a ferrite electromagnetic absorber to prevent the reflection of electromagnetic waves harmful to the measurement. However, as long as it has the required properties, processing accuracy, rigidity, durability, etc., it is not limited to these, and can be freely selected.

In addition, in the unnecessary radiation electromagnetic wave measurement system 40 of FIG. 1, the measurement height is set at two upper and lower positions, but it is needless to say that the measurement height is not limited to this, and may be set at multiple positions.
Further, according to the unnecessary radiation electromagnetic wave measurement system 40 of FIG. 1, the height, depression angle, and polarization angle of the antenna 31 can be easily and accurately set simply by raising and lowering the elevating body 3 with a single motor 12, thereby automating the measurement. can also be easily realized.
In addition, the antenna positioner 1 of FIG. 1 performs an electromagnetic compatibility (EMC) test including an electromagnetic susceptibility (EMS) test to measure the interference resistance of the EUT 41 in addition to an electromagnetic interference (EMI) test to measure unwanted radiation electromagnetic waves from the EUT 41. It can be used for countermeasures, evaluation, etc., and can also be used for antenna design and evaluation.
Further, the antenna positioner 1 shown in FIG. 1 can often be realized by modifying an existing antenna positioner having an elevating body that ascends and descends along a column. In other words, it is sufficient to replace the antenna mounting arm on the lifting body provided with the rotating antenna mounting arm and add a cam plate, a switching cam, and the like.

A second embodiment of an antenna positioner, an unwanted radiation electromagnetic wave measuring system, and an unwanted radiation electromagnetic wave measuring method of the present invention will be described below with reference to the drawings. A detailed explanation is omitted.
(Example 2)
FIG. 9 is a front view of an unwanted radiation electromagnetic wave measuring system 40 including the antenna positioner 1 of the second embodiment. Compared to the first embodiment, the height of the pillar 2 is increased and the lifting distance of the lifting body 3 is increased to enable the measurement of unnecessary radiated electromagnetic waves from the EUT 41 at four measurement heights. FIG. 9 is also a schematic diagram in which the lifting body 3 and the antenna 31 are moved to four measurement heights and are superimposed, and there is actually one lifting body 3 and one antenna 31 . The height of the antenna 31 for measuring unwanted radiation electromagnetic waves is not limited to four, but may be any number of positions as required.

The antenna positioner 1 shown in FIG. 9 also has an antenna mounting arm 4 attached to a lifting body 3 so as to be rotatable about a horizontal axis. The antenna mounting arm 4 rotates by moving while being in contact, and the depression angle α of the antenna 31 mounted on the antenna mounting arm 4 via the antenna adapter 5 changes. The cam surface 6C is set so that the angle of depression of the antenna 31 increases as the elevation body 3 rises within a range of predetermined measurement heights. directed to. At this time, at all measurement heights, the main electromagnetic radiation sources in the EUT 41 should be within the range of the 3 dB beam width of the antenna 31, and furthermore, the entire EUT 41 should be within the range of the 3 dB beam width of the antenna 31. It should fit.
The depression angle display plate 25 attached to the lifting body 3 makes it possible to check the depression angle of the antenna 31 at the position of the needle attached to the rotation center 4C of the antenna attachment arm 4. However, in the antenna positioner 1 of FIG. 9, the angle of depression of the antenna 31 is automatically determined according to the height of the lifting body 3, so it may be omitted.

In the antenna positioner 1 shown in FIG. 9, the first and second switching cams and the like arranged for switching the polarization angle of the antenna 31 by using the elevation of the elevating body 3 in the first embodiment are omitted. However, it is possible to manually switch the polarization angle. The antenna 31 is attached to the antenna adapter 5 , and the polarization angle can be switched by rotating the antenna adapter 5 with respect to the antenna attachment arm 4 . A switching lever may be provided on the antenna adapter 5 in the same manner as in the first embodiment, and the antenna adapter 5 may be manually rotated to switch the polarization angle of the antenna 31 using this lever. 5 may also be manually rotated directly. When switching the polarization angle manually, the antenna adapter 5 including the antenna mounting portion 5M may be integrated with the antenna mounting arm 4, and the antenna 31 may be mounted directly on the antenna mounting portion of the antenna mounting arm 4. FIG.
Needless to say, a polarization switching mechanism similar to that of the first embodiment can be added to the antenna positioner 1 of FIG. The polarization angle of the antenna 31 may be switched when the elevating body 3 is moved outside the measurement range including the four measurement heights. Further, the motor 12, the speed reduction mechanism 13, and the like arranged on the carriage 10 are covered with a cover (not shown) as in the first embodiment.

A third embodiment of an antenna positioner, an unwanted radiation electromagnetic wave measuring system, and an unwanted radiation electromagnetic wave measuring method of the present invention will be described below with reference to the drawings. A detailed explanation is omitted.
(Example 3)
FIG. 10 is a front view of an unwanted radiation electromagnetic wave measuring system 40 including the antenna positioner 1 of the third embodiment. The first embodiment corresponds to the measurement of unwanted radiation electromagnetic waves with a frequency of 1 GHz or more, but the third embodiment mainly corresponds to the measurement of unnecessary radiation electromagnetic waves with a frequency of less than 1 GHz. It uses a log-periodic antenna instead of a horn antenna. In addition, although this is an example in which unnecessary radiation electromagnetic waves from the EUT 41 are measured at two measurement heights above and below, the range of measurement heights and the number of measurement locations are not limited to this. FIG. 10 is also a schematic diagram in which the lifting body 3 and the antenna 31 are moved to two measurement heights and are superimposed on each other. The type of antenna 31 is not limited, and may be, for example, a dipole antenna, a biconical antenna, or a hybrid antenna.

In the measurement of unwanted radiation electromagnetic waves of less than 1 GHz, it is not necessary to increase the angle of depression of the antenna 31 to direct it toward the EUT 41 even when the antenna 31 is raised, and the angle of depression of the antenna 31 may remain zero. Therefore, in the antenna positioner 1 of FIG. 10, the rotation mechanism of the antenna mounting arm 4 including the cam plate 6, the contactor 9, etc., which is provided in the first and second embodiments to change the depression angle of the antenna 31, is omitted.
On the other hand, it is necessary to rotate the antenna 31 around the central axis of the received wave to switch the polarization angle and measure the unwanted radiated electromagnetic waves of both vertical and horizontal polarization. Therefore, the antenna positioner 1 of FIG. 10 is provided with a mechanism for switching the polarization angle of the antenna 31, such as the switching lever 22, the first switching cam 23, and the second switching cam 24, as in the first embodiment. ing. In the antenna positioner 1 of FIG. 10, by providing the first switching cam 23 and the second switching cam 24, the polarization angle of the antenna 31 can be freely switched from horizontal to vertical and from vertical to horizontal. Although the degree of freedom in the procedure is high, measurement of both polarized waves is possible even if one of the switching cams is omitted.
A mechanism for manually adjusting the depression angle of the antenna 31 may be added to the antenna positioner 1 of FIG.

Next, a fourth embodiment of an antenna positioner, an unwanted radiation electromagnetic wave measuring system, and an unwanted radiation electromagnetic wave measuring method of the present invention will be described with reference to the drawings. Since the fourth embodiment differs from the first and second embodiments only in the shape of the cam surface 6C of the cam plate 6, only the different parts will be mainly described below, and the description of the parts with the same configuration will be omitted. do. The cam plate 6 is a component for changing the angle of depression of the antenna 31 according to the elevation of the antenna 31 and directing the antenna 31 toward the EUT 41 . In the fourth embodiment, by changing the shape of the cam surface 6C of the cam plate 6, even if the total height of the EUT 41 is larger than the 3 dB beam width of the antenna 31, it is possible to easily measure unwanted radiation electromagnetic waves from the entire EUT 41. Become.
(Example 4)
FIG. 11(a) is a schematic diagram for explaining the operation of the typical unwanted radiation electromagnetic wave measuring system 40 of the first and second embodiments, and (b) is a cam of the cam plate 6 of the antenna positioner 1. FIG. It is a schematic diagram for demonstrating the shape of 6 C of surfaces. FIG. 11(c) is a schematic diagram for explaining the operation of the unnecessary radiation electromagnetic wave measuring system 40 of the fourth embodiment described below, and (d) is a cam surface 6C of the cam plate 6 of the antenna positioner 1. It is a schematic diagram of.

The heights of the reference points of the antenna 31 from the ground plane when measuring unwanted radiation electromagnetic waves are set to Y0, Y1, Y2, Y3, etc. in order from the bottom, and the horizontal rotation shaft 4H of the antenna mounting arm 4 corresponding to these heights. Assuming that the heights from the ground plane are Z0, Z1, Z2, Z3, etc. in order from the bottom, two or more measurements including at least Z0 and Z1 are required. In FIG. 11(a), a straight line B is a trajectory of the vertical rotation axis 4H, and a reference of the antenna 31 when the horizontal rotation axis 4H is at the second measurement height Z1 on the straight line B. Y1 is the height of the point A1, Y1L is the height of the antenna reference point A1L when the height of the horizontal rotation axis 4H is Z1L, which is slightly lower than Z1, and Z1H is the height of the horizontal rotation axis 4H, which is slightly higher than Z1. Y1H is the height of the antenna reference point A1H. In the first and second embodiments, the central axis of the antenna 31 is directed toward the EUT 41 at all measurement heights Z1, Z2, Z3, etc., except at least the lowest measurement height Z0, so that typically the antenna The central axis of the beam of 31 is made to pass through substantially the same point P on the test table, and the central axis of the antenna 31 is made to pass through substantially the same point P on the test table even in an intermediate region other than the measurement height. .

Therefore, as shown in FIG. 11A, the total height of the EUT 41 is larger than the beam width θ of the antenna 31, and the EUT 41 is within the range of the 3 dB beam width θ of the antenna 31 at the height Z1 of the horizontal rotation axis 4H during measurement. , the center axis of the beam of the antenna 31 still passes through the point P, Unnecessary radiation electromagnetic waves from the entire EUT 41 cannot be measured. FIG. 11(b) is a schematic diagram of the cam surface 6C of the cam plate 6 at this time. Since the central axis of the antenna 31 passes through the point P not only at the measurement heights Z1 and Z2 but also in the intermediate area, The change in inclination of the cam surface 6C within the range of the measurement height of the unwanted radiation electromagnetic wave is small, and the cam surface 6C has a shape that is relatively straight. In FIG. 11B, when the horizontal rotation shaft 4H is at a height Z1, Z2, etc., the positions at which the contactor 9 contacts the cam surface 6C are z1, z2, etc. As shown in FIG.
The depression angle of the antenna 31 is assumed to be zero at the lowest measurement height Z0. When the total height of the EUT 41 does not fit within the range of the beam width of the antenna 31, the antenna 31 is moved up and down so as to scan the EUT 41 with the depression angle of the antenna 31 set to zero, so that the total height of the EUT 41 is within the beam width of the antenna 31. Measurements may be made within the width movement range. Therefore, in the vicinity of the cam position z0 corresponding to the measurement height Z0, the inclination of the cam surface 6C is zero, and the depression angle of the antenna 31 is held zero.

On the other hand, the shape of the cam surface 6C in the fourth embodiment, as shown in FIG. The inclinations of the cam surface 6C at z1L to z1H and z2L to z2H in the vicinity of the cam positions z1 and z2 corresponding to the measurement heights Z1 and Z2 are different from those of the other portions of the cam surface 6C and the average cam of the entire measurement range. It is larger than the inclination of the surface 6C. When the cam plate 6 having such a cam surface 6C is used, as shown in FIG. Then, the angle of depression of the antenna 31 at Z1L, which is slightly lower than the measurement height Z1, can be made slightly smaller than in the first and second embodiments. can be the same as Similarly, since the depression angle of the antenna 31 at Z1H, which is slightly higher than the measurement height Z1, can be made slightly larger than in the first and second embodiments, the height Y1H of the reference point A1H of the antenna 31 at that time is also Y1 can be the same as This also utilizes the fact that the reference point of the antenna 31 is on the side of the EUT 41 relative to the horizontal rotation axis 4H.

As a result, when the horizontal rotation shaft 4H is moved to heights Z1L to Z1 to Z1H, the central axis of the antenna 31 is positioned above the test table 43 while maintaining the height of the reference point of the antenna 31 at the measurement height Y1. Since the EUT 41 can be moved to scan from P1L to P1 to P1H, even if the total height of the EUT 41 is large, the upper part of the EUT 41 is within the range of the beam width of the antenna 31 when the height of the horizontal rotation axis 4H is Z1L. , and the lower portion of the EUT 41 is within the range of the beam width of the antenna 31 when the height of the horizontal rotation axis 4H is Z1H.
Therefore, even if an antenna 31 with a wide beam width cannot be obtained and the distance between the EUT 41 and the antenna 31 cannot be increased to accommodate the EUT 41 having a large overall height, the cam plate 6 having the cam surface 6C as described above can be used. is adopted, it is possible to measure unnecessary radiation electromagnetic waves from the entire EUT 41 . By using the peak hold function while moving the horizontal rotary shaft 4H near the measurement height, it is possible to more easily measure the unwanted radiation electromagnetic waves from the largest radiation source in the EUT 41. FIG.

Next, Modification 1 of the fourth embodiment will be described. Modification 1 differs from the cam surface 6C of the fourth embodiment shown in FIG. will be mainly described, and descriptions of parts with similar configurations will be omitted.
(Modification 1 of Embodiment 4)
FIG. 12(a) is a schematic diagram for explaining the operation of the unwanted radiation electromagnetic wave measuring system 40 of Modification 1 of the fourth embodiment. It is a schematic diagram for explaining the shape of.

In the fourth embodiment, when the total height dimension of the EUT 41 is larger than the beam width of the antenna 31, especially at the lowest measurement height Z0, the antenna 31 is moved up and down so as to scan the total height of the EUT 41 with the angle of depression being zero. In order to move, the inclination of the cam surface 6C was set to zero in the vicinity of the cam position z0 corresponding to the measurement height Z0. On the other hand, in Modification 1, as shown in FIG. 12B, the inclination of the cam surface 6C near the cam position z0 corresponding to the measurement height Z0 is the same as the cam position z1 corresponding to the measurement height Z1. Secondly, it is made larger than the average value of the inclination of the cam surface 6C over the entire measuring range.

By using such a cam plate 6, when the horizontal rotation shaft 4H is moved to heights Z0L to Z0 to Z0H, the height of the reference point of the antenna 31 is maintained at the measurement height Y0. Since the central axis of the beam 31 can be moved to scan the EUT 41 from P0L to P0 to P0H on the test table 43, even if the total height of the EUT 41 is large, the upper part of the horizontal rotation axis 4H is Z0L. The lower part is within the range of the beam width of the antenna 31 when the height of the horizontal rotation axis 4H is Z0H. Therefore, it is possible to measure unwanted radiation electromagnetic waves from the entire EUT 41 corresponding to the EUT 41 having a total height larger than the beam width of the antenna 31 . If the peak hold function or the like is used while moving the horizontal rotation shaft 4H near the measurement height, unwanted radiation electromagnetic waves from the largest radiation source within the EUT 41 can be easily measured.

According to the method of this modified example 1, for the EUT 41 having a total height dimension larger than the beam width of the antenna 31, the height of the reference point of the antenna 31 is not changed even at the lowest measurement height Z0. Radiated electromagnetic waves can be measured. Since it is not necessary to change the height of the reference point of the antenna 31, even if the external dimensions of the antenna 31 are large and the gap between the antenna 31 and the carriage 10 of the antenna positioner 1 or the ground plane is small at the height Y0, the entire EUT 41 can be adjusted. There is an advantage that it is possible to measure unnecessary radiation electromagnetic waves from

Next, Modification 2 of the fourth embodiment will be described. Modification 2 differs from the cam surface 6C of the fourth embodiment shown in FIG. 11(d) only in the shape near the cam position z1 corresponding to the measurement height above Z1 of the horizontal rotation shaft 4H. , only different parts will be mainly described, and descriptions of parts with similar configurations will be omitted.
(Modification 2 of Embodiment 4)
FIG. 13(a) is a schematic diagram for explaining the operation of the unwanted radiation electromagnetic wave measuring system 40 of Modification 2 of the fourth embodiment. It is a schematic diagram for explaining the shape of.

In the fourth embodiment, in the vicinity of the cam position z1 corresponding to, for example, the measurement height Z1 other than the lowest measurement height Z0 of the horizontal rotation axis 4H, the inclination of the cam surface 6C is set within the entire measurement range. It was larger than the average value of the slope. As a result, when the horizontal rotation axis 4H is moved from Z1L to Z1H in the vicinity of the height Z1, the center axis of the beam of the antenna 31 is moved above the test table 43 without changing the height Y1 of the reference point of the antenna 31. Since it moves so as to scan the EUT 41 in the height direction from P1L to P1H, measurement of unnecessary radiation electromagnetic waves from the entire EUT 41 is possible. On the other hand, in the modification 2, as shown in FIG. 13B, in the range from z1L to z1H in the vicinity of the cam position z1 corresponding to the measurement height Z1 or higher, the vicinity of the cam position z0 corresponding to the measurement height Z0 , the inclination of the cam surface 6C is set to zero.

As a result, as shown in FIG. 13A, when the horizontal rotation shaft 4H is moved from Z1L to Z1H near the height Z1, the antenna 31 moves from Y1L to Y1H near the height Y1. The angle of depression of the antenna 31 is constant and directed toward the EUT 41, and the central axis of the beam of the antenna 31 moves from P1L to P1H on the test table so as to scan the EUT 41. FIG. Therefore, even if the total height of the EUT 41 is larger than the beam width of the antenna 31, the upper part of the EUT 41 is within the beam width The height of the moving axis 4H is within the range of the beam width θ of the antenna 31 when the height is Z1L. Radiated electromagnetic waves can be measured. Further, by moving the horizontal rotary shaft 4H near the measurement height and further using a peak hold function or the like, unwanted radiated electromagnetic waves from the largest radiation source in the EUT 41 can be easily measured.

1: Antenna Positioner 2: Column 3: Elevating Body 3C: Notch of Elevating Body 3R: Roller of Elevating Body 3U: Upper Reinforcing Part of Elevating Body 3D: Lower Reinforcing Part of Elevating Body 4: Antenna Mounting Arm 4B: Antenna Bent portion of mounting arm 4C: Rotation center of antenna mounting arm 4D: Branch portion of antenna mounting arm 4H: Horizontal rotational axis of antenna mounting arm 5: Antenna adapter 5M: Antenna mounting portion of antenna adapter 6: Cam plate 6C: Cam surface of cam plate 7: Cam plate fixing part 9: Contactor 10: Truck 10W: Wheel of truck 10L: Fixed leg of truck 11: Drive device 12: Motor 13: Reduction mechanism 14: Lifting body height detection part 15: Controller 16: Drive pulley 17: Driven pulley 18: Belt 19: Belt holder 20: Lower stopper 21: Upper stopper 22: Switching lever 23: First switching cam 24: Second switching cam 25: Depression angle display plate 31: Antenna 31S : Antenna mounting shaft 32 : Rotation detection unit 33 : Control unit 34 : Motor drive circuit 35 : Operation unit 40 : Unwanted radiation electromagnetic wave measurement system 41 : Equipment under test (EUT = Equipment Under Test)
42: turntable 43: test stand

Claims (21)

a column;
an elevating body that ascends and descends along the pillar;
an antenna mounting arm mounted rotatably about a horizontal axis with respect to the lifting body ;
an antenna adapter disposed on the antenna mounting arm and including an antenna mounting portion;
a cam plate fixed near the column and having a cam surface of a predetermined shape;
a contact disposed near the antenna adapter of the antenna mounting arm and rotating together with the antenna mounting arm about the horizontal axis ;
The antenna mounting arm moves while the contactor is in contact with the cam surface when the lifting body is lifted and lowered, so that the antenna mounting arm rotates according to the lifting and lowering of the lifting body ,
An antenna positioner in which, when the elevating body is within a predetermined height range, when the elevating body rises, the antenna mounting arm rotates to increase the angle of depression of the antenna mounting portion . a column;
an elevating body that ascends and descends along the pillar;
an antenna mounting arm;
The antenna mounting arm is rotatably attached to the lifting body about a horizontal axis, and the antenna mounting arm rotates as the lifting body moves up and down,
An antenna adapter including an antenna mounting portion is disposed on the antenna mounting arm,
When the elevating body rises when the elevating body is within a predetermined height range, the antenna mounting arm rotates to increase the angle of depression of the antenna mounting portion, and
The antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm,
When the lifting body is within the predetermined height range and the antenna adapter is at a predetermined rotational position, when the lifting body moves beyond the predetermined height range to a first height, the antenna The adapter rotates and
The antenna positioner wherein the antenna adapter does not rotate when the lifting body is subsequently returned to within the predetermined height range. Within the predetermined height range, the depression angle change rate of the antenna mounting portion with respect to the height change of the elevator in the vicinity of the measurement heights excluding the lowest measurement height among all the determined measurement heights 3. The antenna positioner according to claim 1 or 2 , wherein the rate of change in depression angle of the antenna mounting portion with respect to the height change of the elevator within the predetermined height range is larger than an average value. 2. The antenna positioner according to claim 1 , wherein the antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm. When the lifting body is within the predetermined height range and the antenna adapter is at a predetermined rotational position, when the lifting body moves beyond the predetermined height range to a first height, the antenna The adapter rotates and
5. The antenna positioner according to claim 4 , wherein the antenna adapter does not rotate when the elevator subsequently returns to within the predetermined height range. a column;
an elevating body that ascends and descends along the pillar;
an antenna adapter including an antenna mounting portion;
The antenna adapter is attached to the elevating body so as to be rotatable around the central axis of the antenna attachment portion,
When the antenna adapter is at a predetermined rotational position within a predetermined height range of the elevating body, when the elevating body moves beyond the predetermined height range to a first height, the antenna adapter is rotate and
The antenna positioner wherein the antenna adapter does not rotate when the lifting body is thereafter returned within the predetermined height range. After the elevating body returns to within the predetermined height range, when the elevating body moves beyond the predetermined height range in the direction opposite to the previous height range to a second height, the antenna adapter moves from the previous height range. rotate in the opposite direction,
7. The antenna positioner according to any one of claims 2 , 5, and 6, wherein the antenna adapter does not rotate when the elevating body subsequently returns within the predetermined height range. a switching lever disposed on the antenna adapter;
3. A first switching cam that acts on the switching lever to rotate the antenna adapter when the lifting body moves beyond the predetermined height range to the first height. , 5, 6 . a switching lever arranged on the antenna adapter;
8. The apparatus according to claim 7 , further comprising a second switching cam that acts on the switching lever to rotate the antenna adapter when the elevating body moves beyond the predetermined height range to the second height. antenna positioner. a motor that raises and lowers the lifting body;
a detection unit that detects a change in height from a predetermined reference height of the lifting body;
10. The antenna positioner according to any one of claims 1 to 9 , further comprising a controller that drives the motor based on the detection result of the detection unit to control elevation of the elevator. a column;
an elevating body that ascends and descends along the pillar;
an antenna mounting arm mounted rotatably about a horizontal axis with respect to the lifting body;
an antenna adapter that includes an antenna mounting portion and is attached to the antenna mounting arm so as to be rotatable about the central axis of the antenna mounting portion;
An antenna positioner capable of changing the height of the antenna mounting portion, the angle of depression of the antenna mounting portion, and the angle of rotation of the antenna mounting portion around the central axis, simply by raising and lowering the elevating body. An unwanted radiation electromagnetic wave measurement system including a turntable for rotating a device under test, an antenna, and an antenna positioner,
The antenna positioner includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm that is attached to the elevating body so as to be rotatable about a horizontal axis, and is disposed on the antenna mounting arm. an antenna adapter including an antenna mounting portion;
the antenna is attached to the antenna attachment portion of the antenna positioner;
When the elevating body is within a predetermined height range, when the elevating body rises, the antenna mounting arm rotates to increase the angle of depression of the antenna, thereby increasing the angle of depression of the antenna and increasing the height of the antenna within the predetermined height range. at all measurement heights, the antenna is oriented toward the device under test;
The antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm,
When the lifting body moves to a first height beyond the predetermined height range when the polarization angle of the antenna is in a predetermined state within the predetermined height range, the antenna rotating the adapter to switch the polarization angle of the antenna;
After that, when the elevating body returns within a predetermined height range, the antenna adapter does not rotate, and the polarization angle of the antenna maintains the switched state. An unwanted radiation electromagnetic wave measurement system including a turntable for rotating a device under test, an antenna, and an antenna positioner,
The antenna positioner includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm that is attached to the elevating body so as to be rotatable about a horizontal axis, and is disposed on the antenna mounting arm. an antenna adapter including an antenna mounting portion; a cam plate fixed in the vicinity of the column and formed with a cam surface having a predetermined shape ; a contact that rotates together with the antenna mounting arm about an axis ,
the antenna is attached to the antenna attachment portion of the antenna positioner;
When the elevating body is within a predetermined height range, when the elevating body rises, the contactor moves while being in contact with the cam surface, thereby rotating the antenna mounting arm and increasing the depression angle of the antenna. increases, and the antenna is oriented toward the device under test at all the predetermined measurement heights within the predetermined height range. The depression angle change rate of the antenna with respect to the height change of the elevator in the vicinity of the measurement heights other than the lowest measurement height among all the determined measurement heights is within the predetermined height range. larger than the average value of the depression angle change rate of the antenna with respect to the height change of the elevating body,
14. The method according to claim 12 or 13 , wherein by raising and lowering the elevating body in the vicinity of the measurement height, it is possible to adjust the orientation of the antenna toward the device under test while keeping the height of the reference point of the antenna substantially constant. Unnecessary radiation electromagnetic wave measurement system. The antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm,
When the lifting body moves to a first height beyond the predetermined height range when the polarization angle of the antenna is in a predetermined state within the predetermined height range, the antenna rotating the adapter to switch the polarization angle of the antenna;
14. The unwanted radiation electromagnetic wave measuring system according to claim 13 , wherein when the lifting body returns to within a predetermined height range thereafter, the antenna adapter does not rotate and the polarization angle of the antenna remains switched. . An unwanted radiation electromagnetic wave measurement system including a turntable for rotating a device under test, an antenna, and an antenna positioner,
The antenna positioner includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm attached to the elevating body so as to be rotatable about a horizontal axis, and an antenna mounting portion. an antenna adapter attached to the mounting arm so as to be rotatable about the central axis of the antenna mounting portion;
the antenna is attached to the antenna attachment portion of the antenna positioner;
The antenna mounting arm rotates and the antenna adapter rotates according to the elevation of the lifting body,
An unnecessary radiation electromagnetic wave measurement system capable of changing the height of the antenna, the depression angle of the antenna, and the polarization angle of the antenna by raising and lowering the elevating body. A method for measuring unwanted radiated electromagnetic waves from a device under test using a turntable for rotating the device under test, an antenna, and an antenna positioner, comprising:
The antenna positioner includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm that is attached to the elevating body so as to be rotatable about a horizontal axis, and is disposed on the antenna mounting arm. and an antenna adapter including an antenna mounting portion, wherein the antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm, and the antenna is the antenna of the antenna positioner. When the elevating body is attached to the mounting portion and the elevating body is within a predetermined height range, when the elevating body rises, the antenna mounting arm rotates to increase the depression angle of the antenna, thereby increasing the angle of depression of the antenna. The antenna is oriented in the direction of the device under test at all predetermined measurement heights within the range, and the polarization angle of the antenna is in a predetermined state when the elevator is within the predetermined height range. When the elevating body moves beyond the predetermined height range to a first height, the antenna adapter rotates to switch the polarization angle of the antenna, and then the elevating body moves to the predetermined height. When returning within range, the antenna adapter does not rotate and the polarization angle of the antenna remains switched;
By raising and lowering the elevating body, the antenna is directed toward the device under test at all the determined measurement heights, and
When the polarization angle of the antenna is in a predetermined state, the lifting body is moved to the first height to switch the polarization angle of the antenna, and all the determined measurements are performed before and after switching the polarization angle. A method for measuring unwanted radiation electromagnetic waves in which measurement is performed with the antenna directed toward the device under test at a height. A method for measuring unwanted radiated electromagnetic waves from a device under test using a turntable for rotating the device under test, an antenna, and an antenna positioner, comprising:
The antenna positioner includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm that is attached to the elevating body so as to be rotatable about a horizontal axis, and is disposed on the antenna mounting arm. an antenna adapter including an antenna mounting portion; a cam plate fixed in the vicinity of the column and formed with a cam surface having a predetermined shape ; and a contact that rotates together with the antenna mounting arm about an axis , wherein the antenna is mounted on the antenna mounting portion of the antenna positioner, and when the lifting body is within a predetermined height range, the When the elevating body rises, the contactor moves while being in contact with the cam surface, so that the antenna mounting arm rotates to increase the depression angle of the antenna. characterized in that the antenna faces the device under test at all measurement heights,
A method for measuring unwanted radiated electromagnetic waves, wherein the antenna is directed toward the device under test at all the determined measurement heights by raising and lowering the elevating body. The antenna positioner adjusts the depression angle change rate of the antenna with respect to the height change of the elevator in the vicinity of the measurement heights other than the lowest measurement height among all the determined measurement heights to the predetermined height. is larger than the average value of the rate of change in depression angle of the antenna with respect to the height change of the lifting body within the range of
19. The method according to claim 17 or 18 , wherein the height of the reference point of the antenna is maintained substantially constant by adjusting the orientation of the antenna toward the device under test by moving the lift in the vicinity of the measurement height. Measurement method of unwanted radiated electromagnetic waves. In the antenna positioner, the antenna adapter is rotatable about the central axis of the antenna mounting portion with respect to the antenna mounting arm, and the elevating body moves the polarized wave of the antenna within the predetermined height range. When the angle is in a predetermined state, when the elevating body moves beyond the predetermined height range to a first height, the antenna adapter rotates to switch the polarization angle of the antenna, and then the elevating unit rotates. characterized in that when the body returns within a predetermined height range, the antenna adapter does not rotate and the polarization angle of the antenna remains switched;
When the polarization angle of the antenna is in a predetermined state, the lifting body is moved to the first height to switch the polarization angle of the antenna, and all the determined measurements are performed before and after switching the polarization angle. 19. The method for measuring unwanted radiation electromagnetic waves according to claim 18 , wherein the measurement is performed with the antenna directed toward the device under test at a height. A method for measuring unwanted radiated electromagnetic waves from a device under test using a turntable for rotating the device under test, an antenna, and an antenna positioner, comprising:
The antenna positioner includes a column, an elevating body that ascends and descends along the column, an antenna mounting arm attached to the elevating body so as to be rotatable about a horizontal axis, and an antenna mounting portion. an antenna adapter mounted rotatably about the center axis of the antenna mounting portion with respect to the mounting arm, wherein the antenna is mounted on the antenna mounting portion of the antenna positioner, characterized in that the antenna mounting arm rotates and the antenna adapter rotates,
A method for measuring unwanted radiated electromagnetic waves, wherein measurement is performed by changing the height of the antenna, the angle of depression of the antenna, and the angle of polarization of the antenna by raising and lowering the elevating body.

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