JP4673067B2 - Antenna lifting device - Google Patents

Description

  The present invention relates to an antenna lifting device that lifts and lowers a measurement antenna that receives electromagnetic waves from an object to be measured along a vertically erected column. Specifically, the present invention relates to an antenna lifting device on the side of a column on the mounting side of the measurement antenna. The present invention relates to an antenna lifting apparatus that reduces reflection or stabilizes the mounting posture of a measurement antenna to improve measurement accuracy of radiation characteristics.

A conventional antenna elevating device is composed of a single column that stands upright on the upper surface of a base, a slider that moves up and down along the single column, and is horizontally supported by the slider and measured at the tip. An antenna support rod for mounting a measurement antenna that receives electromagnetic waves from an object, and a driving unit that transmits power to the slider via a belt to raise and lower the slider (for example, see Patent Document 1).
No. 5-45981

  However, in such a conventional antenna lifting apparatus, the support column is a columnar body having a quadrangular cross-sectional shape, and is installed so that one side surface of the quadrangular columnar body faces the arrival direction of the electromagnetic wave. Therefore, electromagnetic waves reflected on the side surfaces, particularly short wavelength electromagnetic waves, are reflected on the mounting side of the measurement antenna and many of them are received by the measurement antenna, which may deteriorate the measurement accuracy.

  In this case, it is conceivable to reduce the reflection of electromagnetic waves by providing a wave absorber on the surface of the support on the electromagnetic wave arrival direction side, but when the antenna lifting device is installed outdoors, the characteristics of the wave absorber due to rain, dust, etc. May change and the radiation characteristics of electromagnetic waves may change.

  In addition, since the antenna support bar is supported by a slider with respect to a single column, when the measurement antenna is attached to the tip of a long antenna support bar, the tip is bent and the measurement antenna is tilted. The measurement accuracy of the radiation characteristics of the electromagnetic waves radiated from the object to be measured may be deteriorated.

  Therefore, the present invention addresses such problems, reduces the reflection of the electromagnetic wave from the object to be measured on the side of the column to the mounting side of the measuring antenna, or stabilizes the mounting posture of the measuring antenna. An object of the present invention is to provide an antenna lifting device that improves the measurement accuracy of the radiation characteristics of electromagnetic waves.

In order to achieve the above object, an antenna lifting apparatus according to a first aspect of the present invention includes a column that is erected perpendicularly to the upper surface of a base, a slider that is vertically movable along the column, and the slider that includes the slider. Elevating means for elevating and lowering along the support, an antenna support bar horizontally supported by the slider, and capable of attaching a measurement antenna that receives electromagnetic waves from the object to be measured at the front end of the electromagnetic wave arrival direction , and A driving unit that applies driving force to the lifting and lowering means, and the support column has a side surface facing the arrival direction of the electromagnetic wave, and the opening gradually narrows from the arrival direction side of the electromagnetic wave toward the back side. A plurality of pyramidal or conical recesses that reduce the reflection of light are formed in a shape that is continuously arranged in the vertical direction, and a hole that communicates with the outside is provided at the rear end of each of the recesses, so Incident on the direction-of-arrival side Led to the back side of the electromagnetic wave is reflected by the inner surface of each recess, said from the hole and the mounting side of the measuring antenna is obtained by allowing the radiation to the opposite side.

With such a configuration, the slider can be moved up and down by a support column standing upright on the upper surface of the base, and an antenna for measurement that receives electromagnetic waves from the object to be measured can be attached to the tip by the slider. The support bar is supported horizontally, the drive unit applies a driving force to the lifting means to move the slider up and down, and the measurement antenna is lifted and received by the measurement antenna. , it is formed side by side in succession in the vertical direction on the side facing the arrival direction of the electromagnetic wave of the struts, openings electromagnetic wave from the arrival direction of the gradually narrowing pyramidal or conical multiple recesses toward the back side of the Reflects the electromagnetic wave incident on the surface of the support in the direction of arrival of radio waves on the inner surface, guides it to the back side, and is opposite to the mounting side of the antenna for measurement from the hole provided in communication with the rear end of each recess Radiate to the side and measure Reduce the electromagnetic wave reflected to the mounting side of the antenna.

An antenna lifting apparatus according to a second aspect of the present invention is a pair of two columns that are vertically erected on the upper surface of the base at a predetermined interval and that are vertically movable along the two columns. Sliders, lifting and lowering means for moving the pair of sliders up and down synchronously along the two columns, and supported by the pair of sliders and horizontally spanned between the two columns, and the direction of arrival of electromagnetic waves An antenna support bar capable of attaching a measurement antenna for receiving electromagnetic waves from an object to be measured at a side tip, and a drive unit that is driven by applying a driving force to the elevating means; of front strut at least the electromagnetic wave arrival direction, a side facing the direction of arrival of the electromagnetic wave, pyramidal or conical to reduce the electromagnetic wave reflection gradually becomes narrower toward the back side opening from the incoming direction of the electromagnetic wave plurality of recesses of Was formed in a shape arranged in succession in the vertical direction, said inner surface of each recess provided with a hole communicating with the outside at a rear end portion each recess an electromagnetic wave incident on the surface of the radio wave arrival direction of said strut And is guided to the back side, and can be emitted from the hole to the side opposite to the mounting side of the antenna for measurement .

With such a configuration, a pair of sliders are supported by two columns that are vertically erected from each other at a predetermined interval on the upper surface of the base so that the pair of sliders can move up and down. The antenna support rod that can be attached is supported and horizontally stretched over the two columns, the driving unit applies a driving force to the lifting means to move the pair of sliders up and down, and the measurement antenna is The electromagnetic wave from the object to be measured is received by the antenna for measurement by moving up and down, and is continuously arranged in the vertical direction on the side facing the arrival direction of the electromagnetic wave of at least the front column in the direction of arrival of the electromagnetic wave among the two columns. The inner side of the plurality of pyramid or conical recesses whose openings are gradually narrowed from the arrival direction of the electromagnetic wave toward the back side by reflecting the electromagnetic wave incident on the surface on the radio wave arrival direction side of the column Led to each recess From a hole provided in communication with the outside and the mounting side of the measuring antenna to the rear end by emitted to the side opposite reduces the electromagnetic wave reflected to the mounting side of the measuring antenna.

Furthermore, the antenna support rod, continuously its upper or lower surface, a pyramidal or conical plurality of recesses opening from the upper or lower side to the inner side to reduce the reflection of the electromagnetic wave becomes gradually narrower in the longitudinal direction Are formed in a line-up shape. Thus, formed side by side in succession in the longitudinal direction on the upper surface or the lower surface of the antenna support rods, electromagnetic wave reflection at the upper or plurality of recesses of the opening from the lower side toward the inside progressively narrower pyramidal or conical Reduce.

  And the said support | pillar is formed with the plastic. This reduces the reflection of electromagnetic waves by the support and improves the weather resistance.

According to the first aspect of the present invention, the side surface of the support column that stands upright perpendicular to the upper surface of the base and faces the arrival direction of the electromagnetic wave is a pyramid or cone whose opening gradually narrows from the arrival direction of the electromagnetic wave toward the back side. A plurality of concavities are formed in a shape that is continuously arranged in the vertical direction, and a hole communicating with the outside is provided at the rear end of each concavity, so that the incident light enters the surface of the support on the radio wave arrival direction side. The electromagnetic wave can be taken into each of the recesses , reflected from the inner surface thereof, guided to the back side, and radiated from the hole at the rear end of each recess to the side opposite to the mounting side of the measurement antenna. Electromagnetic waves reflected to the mounting side can be reduced. Accordingly, it is possible to reduce the electromagnetic wave reflected by the side surface of the support and received by the measurement antenna. Thereby, the measurement accuracy of the radiation characteristic of the electromagnetic waves from the object to be measured can be improved.

Further, according to the invention of claim 2, at least one of the two pillars erected vertically at a predetermined interval on the upper surface of the base, the surface of the struts in front of the electromagnetic wave arrival direction faces the arrival direction of the electromagnetic waves. The side surface is formed into a shape in which a plurality of pyramidal or conical recesses whose openings gradually narrow from the arrival direction of the electromagnetic wave toward the back side are arranged in a row in the vertical direction, and at the rear end of each recess By providing a hole communicating with the outside, the electromagnetic wave incident on the surface of the support on the radio wave arrival direction side is taken into each of the recesses , reflected by the inner surface thereof, guided to the back side, and at the rear end of each recess Radiation can be radiated from the hole to the side opposite to the measurement antenna mounting side, and electromagnetic waves reflected to the measurement antenna mounting side can be reduced. Accordingly, it is possible to reduce the electromagnetic wave reflected by the side surface of the support and received by the measurement antenna. Thereby, the measurement accuracy of the radiation characteristic of the electromagnetic waves from the object to be measured can be improved. Further, a pair of sliders are supported by two columns so that the slider can move up and down, and an antenna support bar on which the measurement antenna can be attached to the tip is supported by the pair of sliders and is horizontally hung on the two columns. By passing the antenna, the bending of the antenna support rod can be reduced, and the mounting posture of the measurement antenna can be stabilized. Therefore, the measurement accuracy of the radiation characteristic of the electromagnetic wave from the object to be measured can be further improved.

Further, the invention according to claim 3, antenna upper or lower surface of the support rod, the upper or the lower pyramid or conical multiple openings toward the inside to reduce the reflection of the electromagnetic wave becomes gradually narrower By forming the recesses in a shape continuously arranged in the longitudinal direction, it is possible to reduce the influence of reflection of electromagnetic waves by the antenna support rod and further improve the measurement accuracy of the radiation characteristics.

Moreover, according to the invention which concerns on Claim 4 , reflection of the electromagnetic waves by a support | pillar can be reduced more because the support | pillar was formed with the plastic. In addition, the weather resistance is improved and it can be used outdoors.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing an embodiment of an antenna lifting apparatus according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a right side view of FIG. This antenna elevating device is for elevating by attaching a measurement antenna 39 for receiving electromagnetic waves from an object to be measured 1 such as a transmission antenna, various communication devices or various electronic devices, and has a base 2 and two struts. 3a, 3b, a pair of sliders 4a, 4b, an elevating means 5, an antenna support bar 6, and a drive unit 7.

  The base 2 holds the below-mentioned support pillars 3a and 3b upright on a flat upper surface and installs the drive unit 7. For example, a plate of a non-metallic material such as reinforced plastic (FRP) or vinyl chloride The base member 8 and the sub-base member 9 are formed.

  The base member 8 is made of a plate material formed in a rectangular shape, and can be moved by providing casters 10 at the four corners on the back surface thereof. In the vicinity of the caster 10, an adjuster foot 11 is provided by being screwed into a screw hole penetrating in the vertical direction, and the height of the adjuster foot 11 is adjusted to make the base member 8 horizontal. Can be kept.

  A rectangular sub-base member 9 is provided on the upper surface of the base member 8. This sub-base member 9 stands upright the support columns 3a and 3b and installs the drive unit 7. As shown in FIG. 3, the sub-base member 9 is placed horizontally at both ends of one side with respect to the base member 8. The shaft 12 is rotatably supported in the direction of arrow A. A plurality of through holes are provided on the peripheral side of the sub base member 9, and the fixing screws 13 are screwed into the screw holes provided in the base member 8 through the through holes as shown in FIG. It can be fixed together.

The upper surface of the sub-base member 9, as shown in FIG. 1, at a predetermined interval is erected vertically to each other two strut 3a, 3b are provided. The two columns 3a and 3b hold a pair of sliders 4a and 4b, which will be described later, so as to be movable up and down. At least the column 3a in front of the direction of arrival of electromagnetic waves is the direction of arrival of electromagnetic waves as shown in FIG. The side facing (in the direction of arrow B) has a pyramid shape or conical shape in which the opening gradually narrows from the arrival direction of the electromagnetic wave toward the back side to reduce the reflection of the electromagnetic wave (in FIG. 4, it is shown as a quadrangular pyramid shape). the plurality of recesses 14 formed into a shape arranged in succession in the vertical direction, for example, is made of a low dielectric constant plastic such as vinyl chloride. Further, the rear end of each recess 14, provided with a hole 15 that passes with the outside, leading to the rear side of the electromagnetic waves incident on the respective recess 14 is reflected by the inner surfaces of the recesses 14, Radiation can be radiated from the hole 15 to the rear side (the side opposite to the mounting side of the measurement antenna described later) . In FIG. 1 or FIG. 2, the column 3b is also shown in the same shape as the column 3a.

Specifically, as shown in FIG. 4 (a), the left and right side plates 16 and 17 which are elongated in the vertical direction and the left and right side plates 16 and 17 are sandwiched between the left and right side plates 16 and 17, and are directed from the arrival direction side to the back side. The upper and lower thin plate members 18 and 19 having a trapezoidal shape are joined to each other so that the distance between the upper and lower plate members 18 and 19 becomes narrower from the electromagnetic wave arrival direction to the back side, A plurality of recesses 14 that are surrounded by the left and right side plates 16 and 17 and the upper and lower plate members 18 and 19 and whose opening gradually narrows from the arrival direction of the electromagnetic wave toward the back side are continuously arranged in the vertical direction. Yes. 4B, the trapezoidal thick top plate 20 and the bottom plate 21 of the same shape shown in FIG. 5 are joined and reinforced in the vicinity of the upper and lower ends of the left and right side plates 16 and 17, respectively. Yes. Further, as shown in FIG. 6, a back plate 22 having holes 15 penetrating in the thickness direction corresponding to the rear end portions of the respective recesses 14 is formed on the surface opposite to the surface on the electromagnetic wave arrival direction side, as shown in FIG. Are joined. According to such a column 3a, since the plurality of upper and lower plate members 18 and 19 are arranged in the vertical direction between the left and right side plates 16 and 17, the mechanical strength of the column can be increased.

  The support columns 3a and 3b can be formed as follows. First, as shown in FIG. 7, for example, a pair of grooves whose intervals are narrowed from the edge on the electromagnetic wave arrival direction side (the left edge in the figure) toward the opposite edge on the inner surface of the left side plate 16 23 and 24 are continuously arranged in the vertical direction, and a hole 25 penetrating in the thickness direction is formed near the upper and lower ends.

  Next, screw holes (not shown) corresponding to the holes 25 are formed on the side surfaces of the trapezoidal thick top plate 20 and the bottom plate 21, and the screw holes and the holes 25 are aligned with each other for fixing. Screws are screwed together to join the left side plate 16 to the top plate 20 and the bottom plate 21.

  Next, an adhesive is applied to one oblique side edge of the upper and lower thin plate members 18 and 19 having the trapezoidal shape. Then, with the base side of the trapezoid as the electromagnetic wave arrival direction side, the one oblique side edge is inserted into the grooves 23 and 24 of the left side plate 16, and the upper and lower plate members 18 and 19 are made to the left side plate 16 Join perpendicularly.

Next, an adhesive is applied to the other oblique side edges of the upper and lower plate members 18 and 19, and the right side plate 17 in which the oblique side edges are formed symmetrically with the grooves 23 and 24 of the left side plate 16 is formed. Are inserted into the groove and joined. Further, through the holes 25 (see FIG. 4B) formed in the vicinity of the upper and lower end portions of the right side plate 17, screws for fixing are respectively inserted into the screw holes formed on the side surfaces of the top plate 20 and the bottom plate 21. The right side plate 17 is joined to the top plate 20 and the bottom plate 21 by screwing. As a result, a plurality of recesses 14 that are surrounded by the left and right side plates 16 and 17 and the upper and lower plate members 18 and 19 and whose opening gradually narrows from the arrival direction of the electromagnetic wave toward the back side are continuously provided in the vertical direction. Formed side by side.

Next, the rear plate 22 formed with a plurality of holes 15 corresponding to the rear end portions of the plurality of recesses 14 is joined with an adhesive so that the holes 15 are aligned with the rear end portions of the respective recesses 14. To do. Thereby, the support | pillar 3a shown in FIG. 4 is completed. The same applies to the column 3b. Further, the support columns 3a and 3b are not limited to those formed by assembling plate materials as described above, and plastic may be formed into the above-described shape.

  Further, as shown in FIG. 1, reinforcing members 26a and 26b are provided at the lower ends of the respective columns 3a and 3b, and the installation area is expanded to ensure installation stability. Further, a head member 27 is provided at the upper end of each of the columns 3a, 3b so as to extend over both columns 3a, 3b so that the parallel state of both columns 3a, 3b can be maintained. As shown in FIG. 3, the support columns 3a and 3b are laid down in the direction of arrow A around the shaft 12 that pivotally supports the sub-base member 9 at the time of transport, so that the transport is facilitated. ing.

  A pair of sliders 4a and 4b is provided on the two support columns 3a and 3b. The pair of sliders 4a and 4b moves up and down along the two support columns 3a and 3b, and is formed of a non-metallic material such as FRP. As shown in FIG. 8A, the slider 4a is shown. And a second insertion hole 29 that is provided on the side of the first insertion hole 28 and penetrates in the horizontal direction, as shown in FIG. ing. The same applies to the slider 4b. In the following description, the slider 4a will be described.

  The first insertion hole 28 is for inserting the support column 3a, and corresponds to the three corners of the support column 3a having a substantially triangular cross section as shown in FIG. 8 (a). A roller 30 is provided at a position where the slider 4a moves up and down smoothly along the column 3a. Further, the second insertion hole 29 is for inserting and supporting an antenna support bar 6 which will be described later, and as shown in FIG. It is formed in a regular octagonal star shape so that it can be rotated and installed.

  As shown in FIG. 9, lifting means 5 is provided between the drive unit 7 and the pair of sliders 4a and 4b. The elevating means 5 is provided with a driving force by the drive unit 7 to elevate and lower the pair of sliders 4a and 4b synchronously along the two support columns 3a and 3b. The driven gears 32a and 32b, first timing pulleys 33a and 33b, second timing pulleys 34a and 34b (see FIG. 1), and timing belts 35a and 35b (see FIG. 1). In addition, all the said raising / lowering means 5 is formed with the nonmetallic material.

  The drive gears 31a and 31b are respectively provided in the vicinity of the lower ends of the two support columns 3a and 3b on the connecting shaft 36 connected to the rotation shaft of the drive unit 7, and It rotates with the rotation. The driven gears 32a and 32b mesh with the drive gears 31a and 31b, respectively, and rotate. Further, the first timing pulleys 33a and 33b are provided with respect to the shafts of the driven gears 32a and 32b and rotate together therewith. Further, the second timing pulleys 34a and 34b are provided in the vicinity of both ends of the head member 27 shown in FIG. 1 corresponding to the first timing pulleys 33a and 33b, respectively. Further, as shown in FIG. 1, the timing belts 35a and 35b are wound around the first timing pulleys 33a and 33b and the second timing pulleys 34a and 34b, and one end thereof is the upper end of the sliders 4a and 4b. The other end is fixed to the lower end of each of the sliders 4a and 4b, so that the rotational force of the rotating shaft of the drive unit 7 can be converted into the linear motion of the sliders 4a and 4b in the vertical direction. ing.

  Further, the rotation shafts of the driven gears 32a and 32b are provided with encoders 37a and 37b, respectively, and the heights of the elevating members 4a and 4b can be measured by detecting the rotation speed and rotation angle of the driven gears 32a and 32b. Yes. Further, the drive gear 31a is provided with a brake 38 so that the rotation of the drive gear 31a can be braked. Thereby, the sliders 4a and 4b can be quickly stopped at predetermined positions, and the setting accuracy of the height of the measurement antenna 39 (see FIG. 1) can be improved.

As shown in FIG. 1, an antenna support bar 6 is supported on the pair of sliders 4a and 4b. The antenna support bar 6 is horizontally stretched over the two columns 3a and 3b, and the antenna 39 for measurement can be attached by providing an antenna mounting portion 40 at the tip of the electromagnetic wave arrival direction (arrow B direction) side. For example, it is made of a non-metallic material such as FRP, and has a rectangular cross-sectional shape. In this case, if one of the corners is installed in the vertical direction, the reflection direction of the electromagnetic wave on the upper and lower surfaces is different from the mounting side of the measurement antenna 39, and the electromagnetic wave is emitted from the measurement antenna 39. The measurement accuracy of characteristics can be further improved. At the rear end portion, a cable guide 41 is provided, and an RF cable for connecting the measurement antenna 39 and a measuring device (not shown) is gently bent along a guide rail formed in an arc shape. It prevents the core wire from being bent and cut, and the impedance from becoming high.

  On the upper surface of the sub-base member 9, a drive unit 7 is installed in the vicinity of the support column 3b behind the electromagnetic wave arrival direction (arrow B direction). The drive unit 7 is driven by applying a driving force to the elevating means 5 to move the sliders 4a and 4b up and down, and is a motor, for example.

Next, the operation of the antenna lifting apparatus configured as described above will be described.
First, as shown in FIG. 3, the sub-base member 9 is rotated about the shaft 12 in the direction opposite to the arrow A to erect the two columns 3a and 3b. Then, a fixing screw 13 is screwed into a screw hole provided in the base member 8 through a plurality of through holes provided in the periphery of the sub base member 9, thereby fixing the sub base member 9 to the base member 8.

  Further, if necessary, a rope is stretched between both ends of the head member 27 of the support columns 3a and 3b and the four corners of the base member 8, and the tension of the ropes is adjusted to raise the postures of the two support columns 3a and 3b. Adjust so that it is perpendicular to the installation surface. Further, when installed outdoors, pegs are driven into the ground on the sides of the four corners of the base member 8 and ropes are stretched between the pegs and both ends of the head member 27 to prevent the base member 8 from falling.

Next, as shown in FIG. 8, the antenna support bar 6 is inserted through the second insertion holes 29 of the sliders 4a and 4b, and the direction of arrival of electromagnetic waves on the antenna support bar 6 as shown in FIG. The antenna for measurement 39 is attached to the antenna attachment portion 40 at the tip of the arrow B direction . Further, an unillustrated RF cable hanging through the cable guide 41 at the rear end of the antenna support bar 6 is connected to the measuring instrument.

  Next, the drive part 7 is driven and a drive force is given to the raising / lowering means 5 shown in FIG. In this case, the driving force of the driving unit 7 is transmitted to the driving gear 31b of the elevating means 5, and the driven gear 32b is further driven to rotate the first timing pulley 33b. A timing belt 35b is wound around the first timing pulley 33b and the second timing pulley 34b, and one end is fixed to the upper end of the slider 4b, and the other end is fixed to the lower end of the slider 4b. Therefore, the rotation of the first timing pulley 33b is converted into a linear motion to raise the slider 4b along the column 3b. Similarly, the driving force of the driving unit 7 is transmitted to the driving gear 31a via the connecting shaft 36, and the driven gear 32a is driven. Further, the driving force is transmitted to the slider 4a via a timing belt 35a wound around the first timing pulley 33a and the second timing pulley 34a, and the slider 4a is synchronized with the slider 4b and applied to the support column 3a. Along to a predetermined position along. Thereby, the measurement antenna 39 is installed at a predetermined height. At this time, since the two sliders 4a and 4b are driven synchronously by the elevating means 5, the antenna support bar 6 moves smoothly while maintaining a horizontal state.

When the measurement antenna 39 is installed at a predetermined height, the DUT 1 placed opposite to the measurement antenna 39 by a predetermined distance is driven, and electromagnetic waves are emitted from the DUT 1. Radiated. The measurement antenna 39 receives the electromagnetic wave and measures the radiation characteristic of the electromagnetic wave of the DUT 1 with a measuring instrument. In this case, of the two struts 3a and 3b, at least the strut 3a in front of the direction of arrival of electromagnetic waves (direction of arrow B in FIG. 1) is a side surface facing the direction of arrival of electromagnetic waves (direction of arrow B) as shown in FIG. since the formed into a shape arranged pyramidal plurality of recesses 14 to reduce the reflection of electromagnetic waves aperture becomes gradually narrower continuously in the vertical direction toward the rear side from the incoming direction of electromagnetic waves, the As shown by arrows in FIG. 10, the electromagnetic waves incident on the surface of the support column 3a on the electromagnetic wave arrival direction side are reflected by the upper and lower plate members 18 and 19 or the left and right side plates 16 and 17 of the respective recesses 14 to form the recesses. 14 is led to the back side and is radiated rearward from a hole 15 communicating the rear end portion of the recess 14 with the outside. Thereby, the electromagnetic waves reflected to the mounting side of the measurement antenna 39 are reduced, and the measurement accuracy of the radiation characteristics is improved.

  And when measuring electromagnetic waves of different polarization planes, the antenna support rod 6 is rotated by a predetermined angle to switch the polarization planes. The polarization plane may be switched by removing the antenna support bar 6 once, changing the angle, and installing it again. However, the antenna support bar 6 can be rotated in the second insertion hole 29 of the sliders 4a and 4b. A rotating mechanism that supports the rotating mechanism may be provided, and the rotating force of the driving unit 7 may be transmitted to the rotating mechanism to rotate the antenna support rod 6. In this case, the polarization plane switching means disclosed in Japanese Utility Model Publication No. 5-45981 can be applied.

In the above-described embodiment, the side surfaces facing both the two support columns 3a and 3b in the direction of arrival of the electromagnetic wave have a plurality of recesses whose openings are gradually narrowed from the arrival direction of the electromagnetic wave toward the back side. However, the present invention is not limited to this, and only the support column 3a in front of the arrival direction of the electromagnetic wave may have the plurality of recesses 14 formed therein.

  Moreover, although the case where the two support | pillars 3a and 3b were provided was demonstrated in the said embodiment, it is not restricted to this, You may provide only the support | pillar 3a of the front side of the electromagnetic wave arrival direction.

And in the said embodiment, although the case where the antenna support rod 6 had a square cross-sectional shape was demonstrated, it is not restricted to this, A cross-sectional shape may be circular, or the reflection direction of the electromagnetic waves in the side surface is Any shape may be used as long as the direction is different from the mounting side of the measurement antenna 39. Furthermore, the antenna support rod 6 has a plurality of pyramidal or conical recesses in the longitudinal direction, the opening or bottom surface of which is gradually narrowed from the upper side or the lower side toward the inside to reduce the reflection of electromagnetic waves. It may be formed in a continuously arranged shape.

It is a front view which shows embodiment of the antenna raising / lowering apparatus by this invention. It is a top view of FIG. It is a right view of FIG. It is a figure which shows the shape of a support | pillar, (a) is a front view, (b) is a right view. FIG. 5 is a plan view of FIG. FIG. 5 is a rear view of FIG. It is a figure which shows the left side plate of the said support | pillar, (a) is a front view, (b) is a right view. In the said antenna raising / lowering apparatus, it is a figure which shows one structural example of a slider, (a) is a top view, (b) is a right view. In the said antenna raising / lowering apparatus, it is explanatory drawing which shows the principal part of a drive part and the raising / lowering means connected to it. It is explanatory drawing which shows reflection of the electromagnetic wave taken in in the recess of the said support | pillar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... To-be-measured object 2 ... Base 3a, 3b ... Support | pillar 4a, 4b ... Slider 5 ... Lifting means 6 ... Antenna support rod 7 ... Drive part 14 ... Recess 15 ... Hole 39 ... Measuring antenna B ... Direction of electromagnetic wave arrival

Claims (4)

A column that stands upright on the top surface of the base;
A slider provided to be movable up and down along the column;
Elevating means for elevating the slider along the column;
An antenna support bar that is horizontally supported by the slider, and can be attached to a measurement antenna that receives electromagnetic waves from the object to be measured at the front end of the electromagnetic wave arrival direction ;
A driving unit that drives the lifting means by applying a driving force;
The support column has a plurality of pyramidal or conical recesses in a vertical direction in which the opening gradually narrows from the arrival direction side to the back side of the electromagnetic wave to reduce the reflection of the electromagnetic wave. In the rear end of each recess, a hole communicating with the outside is provided to reflect the electromagnetic wave incident on the surface of the support on the radio wave arrival direction side by the inner surface of each recess. An antenna lifting device characterized in that it is guided to the back side and can radiate from the hole to the side opposite to the mounting side of the antenna for measurement . Two struts erected vertically at a predetermined interval on the upper surface of the base;
A pair of sliders provided so as to be movable up and down along the two columns;
Elevating means for elevating and lowering the pair of sliders along the two columns;
An antenna support rod that is supported by the pair of sliders and is horizontally stretched between the two support columns, and capable of attaching a measurement antenna that receives an electromagnetic wave from an object to be measured at an end portion on the arrival direction side of the electromagnetic wave;
A driving unit that drives the lifting means by applying a driving force;
Of the two posts, the front of the strut at least the electromagnetic wave arrival direction, a side facing the direction of arrival of the electromagnetic wave, thereby reducing the reflection of electromagnetic wave becomes gradually narrower toward the rear side from the incoming direction of the opening electromagnetic wave A plurality of pyramid-shaped or conical recesses are formed in a shape in which the recesses are continuously arranged in the vertical direction, and a hole communicating with the outside is provided at the rear end of each recess to provide a surface on the radio wave arrival direction side of the column. An antenna lifting apparatus characterized in that the electromagnetic wave incident on is reflected by the inner surface of each recess and guided to the back side, and can be radiated from the hole to the side opposite to the mounting side of the antenna for measurement . The antenna support rod has a plurality of pyramidal or conical recesses continuously extending in the longitudinal direction on the upper surface or lower surface thereof , the opening gradually becoming narrower from the upper side or the lower side toward the inner side to reduce the reflection of electromagnetic waves. 3. The antenna elevating device according to claim 1, wherein the antenna elevating device is formed in a line-up shape. The antenna elevating device according to any one of claims 1 to 3 , wherein the support column is made of plastic.

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