JP3349689B2 - Antenna measuring instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an antenna measuring device for measuring the characteristics of the measured antenna, in particular, it makes it possible to measure the radiation pattern of the radio wave to a true spherical shape, measuring
The present invention relates to an antenna measuring device with improved accuracy .

[0002]

2. Description of the Related Art Conventionally, this type of antenna measuring device uses a guide to change the receiving position of a radio wave radiated from an antenna to be measured, for example, when measuring a radiation pattern of a radio wave. Specifically, the arc-shaped guide receives
Attach the test antenna as use so as to be slidable, it had measured the radiation pattern combined with the rotation of the sliding operation and the measured antenna test antenna.

[0003]

By the way, in order to analyze the radiation pattern of a radio wave three-dimensionally, it is desirable to measure the radiation pattern in a spherical shape. However, a conventional antenna measuring device using an arcuate guide can only measure a hemispherical radiation pattern.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an antenna measuring instrument capable of measuring a radiation pattern of a radio wave in a true spherical shape and improving measurement accuracy. .

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The antenna measuring apparatus according to the present invention is for measuring the transmission or reception characteristics of the radio wave of the measured antenna, the
An antenna driver for measurement to rotate the measurement antenna
A step and the measured object on the axis of rotation of the antenna to be measured.
Place the test receiving or transmitting antenna installed facing the antenna in the plane to which the rotation axis of the antenna to be measured belongs.
In the rotary drive is on a circular track around the the antenna under test
Comprising a test antenna drive means for the said drives the two driving means, wherein the receiving or transmitting antenna the test
By combining the rotation operation with the antenna to be measured, the transmission or reception characteristics of the antenna to be measured can be measured on a true spherical surface .

In such a configuration, the antenna driver to be measured is
The antenna to be measured is rotated in the step, and the antenna to be measured is
On the axis of rotation of the antenna toward the antenna under test.
Place the placed test receiving or transmitting antenna on the test antenna.
The plane to which the rotation axis of the antenna to be measured belongs by the tenor driving means
In a circular orbit around the antenna under test
The test receiving or transmitting antenna and the measured
The antenna to be measured is combined with the rotation of the antenna.
The transmission or reception characteristics of the antenna are measured on a true spherical surface.

Further , the test antenna driving means is provided
The antenna to be measured is provided opposite to the side of the antenna to be measured.
Has an axis of rotation that is orthogonal to the axis of rotation of the antenna
A drive unit, an arm having one end connected to the rotating shaft and extending substantially perpendicular to the rotating shaft, and extending from the other end of the arm in a direction substantially parallel to the rotating shaft. support provided with an antenna holder for supporting a test antenna
Those constructed and a part. This allows rotation
One end is connected to the shaft and extends in a direction substantially parallel to the rotation shaft.
The test antenna is supported by the support
The support shaft is rotationally driven by rotating the rotation shaft, and the test antenna is
To the axis perpendicular to the axis of rotation of the antenna under test.
Based on the rotation axis, the plane to which the rotation axis of the antenna to be measured belongs
In a circular orbit around the antenna to be measured
You.

Further, prior Symbol antenna holder, in which a structure is slidable along the arm.
This allows the test to be performed by sliding along the arm
The distance between the antenna for measurement and the antenna to be measured is made variable.

[0009] is obtained by constituting the front Symbol antenna holder in Telecommunications low reflector. This makes it possible to
Antennas that have a significant effect on measuring antenna characteristics
The generation of reflected waves in the vicinity of the corner is reduced.

Further, it is provided with a wave absorber on at least one surface of the driving portion and the arm facing the antenna under test side. This adds a radio wave absorber
Of reflected waves that affect the measurement of antenna characteristics
Composition is further reduced.

[0011] Before Symbol measured antenna driving means is obtained by the structure having a position detecting means for detecting a rotational position of the antenna under test. This allows the position detection
The stage accurately detects the position of the antenna to be measured.

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of an embodiment of an antenna measuring device according to the present invention.

In this embodiment, the case where the test antenna is a receiving antenna and the antenna to be measured is a transmitting antenna will be described. In FIG. 1, the antenna measuring device of the present embodiment includes a test antenna drive unit 20 as a test antenna drive unit and a measured antenna drive unit 50 as a measured antenna drive unit. .

The test antenna driving unit 20
It is configured to include a support portion 30 for supporting the test antenna 10, and a driving unit 40 for rotationally driving the supporting <br/> sandwiching member 30. Further, the support 30 includes a rotatable one end is coupled to stearyl over 42 as a rotation shaft of the driving unit 40
Is, the arm 32 that extends in a direction substantially perpendicular to said rotation axis
And an antenna holder 31 extending from the other end of the arm 32 in a direction substantially parallel to the rotation axis and fixing the test antenna 10.

The antenna holder 31 is formed in a truncated cone shape with a radio wave low reflector for reducing the reflection of radio waves.
As the radio wave low reflector, a foam material such as styrene foam or urethane foam is particularly preferable.In this case, in order to reinforce the strength of the foam material, it is more preferable to adopt a configuration in which the foam material is covered with a heat-shrinkable tube. .

The arm 32 has an antenna holder 31
A long hole 34 is formed at the mounting end of the antenna holder 31, and the antenna holder 31 is fixed with the stopper 33 through the long hole 34. A radio wave absorber 80 is provided on the surface of the arm 32 facing the antenna to be measured 90 described later.

On the other hand, the driving section 40 is provided with a rotation positioner 4 having a power function and a rotation angle detecting function.
1, a stay 42 to which one end of an arm 32 is fixed as a rotation axis of the rotation positioner 41, and a test antenna holder 43 having a height equal to or higher than the arm 32.

[0019] Under the above configuration, first, the antenna holder 31 the test antenna 10 to are disposed so as to face towards the 該被measurement antenna 90 on the axis of the rotation axis of the antenna under test 90. Then, the driving unit 40 is driven.
To rotate the support unit 30 to rotate the test antenna 10
The rotating circular orbit around the said antenna under test 90 in a plane rotation axis belongs of the antenna under test 90.

Meanwhile, the antenna driving section 50 under test
Is formed of a non-metallic material, and the test antenna drive is
A flat support plate 56 extending in the direction of the rotation axis of the drive unit 40 provided in the moving means 20, and a motor 53 serving as a power source
A pulley 51 pivotally supported at one end of the support plate 56 and fixed to a rotating shaft of the motor 53;
6 on the upper surface on the other end side, the axis of the rotation axis of the drive unit 40
Table 5 that is rotatably supported on the axis of rotation that intersects
5, a timing belt 52 for rotating the pulley 51 and the table 55 in conjunction with each other, and an encoder 54 as a position detecting means for detecting the rotation angle of the motor 53 to detect the position of the antenna 90 to be measured. And a measured antenna holder 5 for holding one end of the support plate 56.
7 is provided. It should be noted that the motor 53 and the encoder 54 is accommodated in the antenna under test holder 57.

[0021] Under the above configuration, the measured antenna 90 along the axis of the rotary shaft on the table 55 standing
Is established . When the motor 53 is driven, the pulley 51 rotates, and the timing belt 52 rotates.
As a result, the rotation of the pulley 51 is transmitted to the table 55,
The measured antenna 90 rotates on the rotation axis of the table 55.

Next, the operation of measuring the radiation pattern of the radio wave radiated from the antenna 90 to be measured by the antenna measuring instrument of the present embodiment will be described with reference to FIGS.

As shown in FIG. 2, and the test antenna driving section 20 in the anechoic chamber 82 is installed a part of the measured antenna driving section 50. At this time, the test antenna driving unit 20
The reflection of radio waves in order to reduce, to the front surface which faces the said test antenna 10 of the rotation positioner 41 and the test antenna holder 43 in,
A radio wave absorbing wall 81 having a hole 82 for penetrating the stay 42 and having a radio wave absorber 80 attached to a plate is provided. The radio wave absorber 80 may be provided directly on the test antenna holder 43.

As shown in FIG. 3, the antenna holder 31 is inserted into the elongated hole 34 so that the test antenna 10 has a predetermined circular orbit radius within the range of R1 to R0 around the antenna 90 to be measured. And fixed to the arm 32 with the stopper 33.

[0025] Then, the side of Teia antenna 90 and 該被measuring antenna 90 measuring the object to be erected on the table 55
The stay 42 is adjusted so that the stay 42 and the stay 42 are substantially the same height. Further, the rotation positioner 41, the motor 53, and the encoder 54 are electrically connected to the control device 60 by, for example, an optical fiber cable 70.
Connect with

In FIG. 2, the motor 53 is driven in a preset step based on the rotation angle information sent from the control device 60. As a result, the measured antenna 90 intermittently rotates at a predetermined rotation angle (for example, 0.1 °), and the rotation angle is detected by the encoder 54 and fed back to the control device 60. The above operation is performed until the measured antenna 90 rotates 360 °.

On the other hand, based on information such as the rotation speed sent from the control device 60, the test antenna 10 rotates 360 ° around the antenna 90 to be measured. At this time, the rotation positioner 41 transmits information on the measurement position of the test antenna 10 and information on the radiation intensity at the measurement position to the control device 60. The above operation is performed for each predetermined rotation angle of the antenna 90 to be measured.

Based on the information transmitted in this way, the control unit 60 performs a process for displaying the radiation pattern, such as digitizing the radiation intensity and graphing the radiation intensity. As described above, the measurement of the antenna characteristics by measuring a combination of rotation of the rotary and the test antenna 10 of the antenna under test 90, in particular, hitherto the true spherical radiation pattern measurements of the radio wave was performed only in the semi-spherical Can be measured.

The antenna holder 31 may be made of a foamed material such as styrofoam or urethane foam, or a foamed material may be covered with a heat-shrinkable tube to reinforce the strength of the foamed material such as styrofoam or urethane. Since the test antenna 10 is separated from the driving unit 40, it is possible to reduce the reflected wave near the test antenna 10 generated by the reflection of the radio wave radiated from the antenna 90 to be measured. For this reason, the accuracy of the measuring device can be improved.

Further, by using the long hole 34 provided on the arm 32, measured under a test antenna 10 Teia antenna 90
And the distance to the test antenna 1
0, the measurement according to the change in the distance between the antennas 90 to be measured can be performed, and the size of the antenna 90 to be measured can be given a degree of freedom.

Further, since the antenna holder 31 is formed of a foam material and can be disassembled, the antenna holder 31 can be disassembled.
, The carrying of the measuring instrument becomes easy, and the burden of installation work in the anechoic chamber 82 can be reduced.

The optical fiber cable 7 is used for the cable.
Since 0 is adopted, noise resistance is improved. In this embodiment, for each predetermined rotation angle of the antenna 90 to be measured,
Method showed how, on the contrary, for each predetermined rotation angle of the test antenna 10, which rotates the object to be measured Teia container 90 360 ° degree be measured to test the antenna 10 is rotated 360 ° It is also possible to take.

[0033] In the present embodiment, the test antenna
Although the case where the antenna 10 is the receiving antenna and the antenna under test 90 is the transmitting antenna is shown, the characteristics of the receiving antenna can be measured using the test antenna 10 as the transmitting antenna and the antenna under test 90 as the receiving antenna.

The present invention is configured as described above.
According to the invention as set forth in claim 1, the measured antenna driving means
The antenna to be measured is rotated by
Installed toward the antenna under measurement on the axis of the rotation axis
The received test or receive antenna for testing.
In the plane to which the rotation axis of the antenna to be measured belongs
Is driven to rotate on a circular orbit around the antenna to be measured.
The test receiving or transmitting antenna and the
By combining the rotation of the antenna,
Can be measured on a true spherical surface.
Therefore, measurement accuracy can be improved.

According to the second aspect of the present invention, the rotation
One end is connected to the shaft and extends in a direction substantially parallel to the rotation shaft.
The test antenna is supported by the support
The support can be driven to rotate by rotating the turning shaft. I
Therefore, connect the test antenna to the rotation axis of the antenna to be measured.
Based on the axis of rotation that is orthogonal to the axis of
The antenna to be measured is centered in the plane to which the rotation axis of the tenor belongs.
Can be rotated on a circular orbit. In addition, since the antenna holder can be disassembled, it is easy to carry and the burden of installation work in an anechoic chamber can be reduced. Also, since the test antenna was separated from the drive unit,
It becomes possible to reduce the reflected wave generated by the reflection of the radio wave. For this reason, the accuracy of the measuring device can be further improved.

Further, according to the third aspect of the present invention,
The test antenna and the measured
The distance to the antenna can be made variable. Accordingly
Te, test antenna, it becomes possible to measure the characteristics depending on the distance change between the antenna under test. Moreover, the degree of freedom of the antenna to be measured can be given.

Furthermore, the invention according to claim 4 or 5
According to the measurement of antenna characteristics with low radio wave reflector
Of reflected waves in the vicinity of the antenna where the effect of
Can be reduced. Therefore, the reliability of the measuring instrument can be further improved.

According to the sixth aspect of the present invention,
Position detection means to accurately detect the position of the antenna to be measured.
Can be. Therefore, the accuracy of the measuring instrument can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an antenna measuring device according to the present invention.

FIG. 2 is a diagram in which the embodiment is installed in an anechoic chamber;

FIG. 3 shows a circular orbit drawn by a test antenna.

[Explanation of symbols]

10 test antenna 20 test antenna driving section 30 supporting portion 31 antenna holder 32 arm 40 driving unit 50 to be measured for the antenna driving section 80 wave absorber 90 measuring the Teia antenna

Claims (6)

(57) [Claims] 1. A antenna measuring device for measuring the transmission or reception characteristics of the radio wave of the measured antenna, and the measured antenna driving means for causing rotating the antenna under test, said on the axis of the rotation axis of the antenna under test Ante to be measured
The receiving or transmitting antenna installed the tested towards the Na, the trial <br/> test for rotational driving on a circular track around the the antenna under test in a plane the axis of rotation of the antenna under test belongs Antenna driving means, for driving both of the driving means ,
Combines the rotating operation of the transmitting antenna and the antenna under measurement to adjust the transmission or reception characteristics of the antenna under measurement.
An antenna measuring device characterized in that it can be measured on a true spherical surface . 2. The test antenna driving means according to claim 1 , wherein:
The antenna to be measured is provided opposite to the side of the fixed antenna.
Having an axis of rotation perpendicular to the axis of rotation of the drive unit
If, for the test is extended in a direction substantially parallel arms that extend in substantially vertical direction, and with respect to the rotary shaft from the other end of the arm relative to the connected one end side to the rotary shaft the rotary shaft The antenna measuring device according to claim 1, further comprising: a support portion provided with an antenna holder for supporting the antenna. 3. The antenna measuring device according to claim 2 , wherein the antenna holder is slidable along the arm. 4. An antenna measuring instrument according to claim 2, wherein said antenna holder is made of a radio wave low reflector. 5. The antenna measuring instrument according to any one of claims 2-4 in which a radio wave absorber on at least one surface of the arm and the drive portion facing the antenna under test side. Wherein said antenna under test drive means, an antenna measuring instrument according to claim 1 which is configured to include a position detecting means for detecting a rotational position of the antenna under test.