CN213875853U

CN213875853U - Scanning frame

Info

Publication number: CN213875853U
Application number: CN202022366371.5U
Authority: CN
Inventors: 夏冬雪
Original assignee: Shenzhen Rongsheng Technology Co ltd
Current assignee: Shenzhen Rongsheng Technology Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-08-03
Anticipated expiration: 2030-10-21

Abstract

The utility model relates to a scanning frame, include: horizontal, vertical, polarization and radio frequency cables; the upper surface of the horizontal shaft is provided with a slide rail; the lower end of the vertical shaft is connected with the slide rail in a sliding way; the vertical shaft is provided with a moving part which slides on the vertical shaft in the vertical direction; the polarization axis is fixed on the moving part; the scanning frame also comprises an antenna and a radio frequency front end; the polarization shaft is connected with the antenna through the radio frequency front end; the polarization axis coincides with the rotation axis of the antenna. The utility model discloses guaranteed the linearity of slip axis trace, the range and the phase error of introducing when having reduced non-linearity and having slided have especially reduced the introduction of phase error to, owing to increased the polarization axle, can realize under arbitrary angle polarization mode, accurate test compact field quiet zone performance parameter.

Description

Scanning frame

Technical Field

The utility model relates to a reduce field test technical field, especially relate to a scanning frame.

Background

When the compact range is checked and accepted, the performance of the quiet zone of the compact range, including the size of the quiet zone, amplitude taper, amplitude ripple and phase ripple in the range of the quiet zone, needs to be measured. The size of the dead zone is generally similar to a square, and in view of the requirement, a scanning frame needs to be designed, the antenna is clamped on the scanning frame, and the scanning frame moves vertically to the horizontal direction, so that the test of the dead zone is realized.

However, because the compact field quiet zone is very sensitive to the testing environment and means, the testing results are often biased by various disturbances and the cause is difficult to find.

Therefore, it would be a technical problem for those skilled in the art to provide a gantry capable of accurately testing the performance of compact field quiet zones.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a scanning frame to accurate test reduces the field quiet zone performance.

The utility model discloses the scanning frame includes: horizontal, vertical, polarization and radio frequency cables; the upper surface of the horizontal shaft is provided with a sliding rail; the lower end of the vertical shaft is connected with the slide rail in a sliding manner; the vertical shaft is provided with a moving portion that slides in a vertical direction on the vertical shaft; the polarization axis is fixed to the moving part; the scanning frame also comprises an antenna and a radio frequency front end; the polarization shaft is connected with the antenna through the radio frequency front end; the polarization axis coincides with the rotation axis of the antenna.

Further, the scanning frame also comprises a wire drag chain; the wire drag chain is used for accommodating a radio frequency cable; the wire drag chain is hollow; the wire drag chain is used for bending and guiding the radio frequency cable in an appointed shape.

Further, in the above-mentioned scanning frame, the horizontal shaft and the vertical shaft are provided with a baffle plate on the surface; wave-absorbing materials are attached to the baffle.

Further, the scanning frame also comprises a network analyzer; the antenna or the radio frequency front end is connected with the network analyzer through an electric signal.

Furthermore, the scanning frame also comprises a height increasing platform; the height increasing platform is fixedly connected with the lower part of the horizontal shaft and is used for being suitable for dead zones with different heights.

Further, in the above-mentioned scanning frame, the antenna is a cone horn antenna.

Furthermore, in the scanning frame, a flat plate with a fixed position is mounted at the front end of the conical horn antenna, and wave-absorbing materials are attached to the flat plate.

The utility model discloses an among the horizontal axis and the vertical axis slip process, guaranteed the linearity of slip axle mark well, the range and the phase error of introducing when having reduced non-linearity slip have especially reduced the introduction of phase error, and, the utility model discloses increased the polarization axle, can realize under arbitrary angle polarization mode, accurate test compact field quiet zone performance parameter.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic view of a compact range quiet zone performance test using an embodiment of the gantry of the present invention;

fig. 2 is a schematic perspective view of an embodiment of the scanning gantry of the present invention;

fig. 3 is a front view of fig. 1.

Wherein:

1 horizontal axis

2 vertical axis

3 polarization axis

4 radio frequency front end

5 baffle plate

6-wire drag chain

7 heightening platform

8-cone horn antenna

9 feed source

10 reflective surface

11 scanning frame

12 network analyzer

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes a preferred embodiment of the present invention with reference to fig. 1, 2 and 3.

Referring to fig. 1, fig. 1 is a schematic diagram of a usage state of an embodiment of the present invention when a compact range quiet zone performance test is performed.

Referring to FIG. 1, a compact range testing system generally includes: a feed source 9 and a reflecting surface 10; the feed 9 comprises a feed antenna; the phase center of the feed source antenna is arranged at the focus of the curved surface of the reflecting surface 10; the tested piece is arranged in the quiet zone; the reflecting surface 10 is a paraboloid and receives spherical waves emitted by the feed source 9 in the compact range, and plane waves generated after reflection reach a quiet area. The utility model discloses scanning frame 11 tests the performance in quiet district under network analyzer 12's cooperation.

Referring to fig. 2 and 3, fig. 2 is a schematic perspective view of an embodiment of a gantry of the present invention, and fig. 3 is a front view of fig. 2.

The scanning frame of the embodiment comprises: horizontal axis 1, vertical axis 2, polarization axis 3 and radio frequency cable. The upper surface of the horizontal shaft 1 is provided with a slide rail (not shown). The lower end of the vertical shaft 2 is slidably connected with a slide rail, and the vertical shaft 2 is provided with a moving part which slides in the vertical direction on the vertical shaft. The polarization axis 3 is fixed to the moving part. The gantry also comprises an antenna and a radio frequency front end 4. The antenna of the embodiment is the conical horn antenna 8, and the test result is optimized by fully utilizing the characteristic of symmetrical directional diagrams of the conical horn antenna 8. The polarization shaft 3 is connected with a conical horn antenna 8 through a radio frequency front end 4; the polarization axis 3 coincides with the axis of rotation of the conical horn antenna 8. The polarization axis 3 can realize arbitrary angle polarization, especially 45 degree polarization, of the conical horn antenna 8. The radio frequency front end 4 is fixed on a mechanical tool firstly, and then the mechanical tool is fixedly connected with the moving part of the Y axis.

When the conical horn antenna 8 and the network analyzer 12 or other instruments can be directly connected for testing, the radio frequency front end 4 is not needed; when the conical horn antenna 8 cannot be directly connected with the network analyzer 12 or other instruments for testing, for example, 50GHz to 110GHz, the conical horn antenna 8 needs to be connected with the network analyzer through an intermediate frequency signal after being mixed by the radio frequency front end 4, and then the rear end of the conical horn antenna 8 is connected with the radio frequency front end 4 first and then connected with the network analyzer 12 or other instruments for testing.

In the sliding process of the horizontal shaft 1 and the vertical shaft 2, the straightness of a sliding axis trace is well guaranteed, amplitude and phase errors introduced in non-linear sliding are reduced, particularly, the introduction of the phase errors is reduced, and the polarization shaft 3 is added, so that the static region performance parameters of a compact range can be accurately tested in a polarization mode of any angle. Or recording the specific variable of the sliding axis trace in real time, and correcting the system test result by using the variable, thereby achieving the effect of high-precision test.

The scanning frame of the embodiment further comprises a wire drag chain 6, wherein the wire drag chain 6 is hollow and is used for accommodating a radio frequency cable; the wire drag chain 6 is used for bending and guiding the radio frequency cable in an appointed shape. The wire drag chain 6 can ensure that the bending structure is always kept unchanged in the moving process of the radio frequency cable, the effects of amplitude stabilization and phase stabilization are achieved, phase and amplitude errors caused by different bending structures of the radio frequency cable are reduced, and the compact field quiet zone performance parameters are tested more accurately.

In the scanning frame, horizontal axis 1 and vertical 2 surfaces of axle all are provided with baffle 5, paste smooth absorbing material on baffle 5 to reduce the influence of scanning frame structure to the quiet district performance parameter test of compact range.

The scanning frame also comprises a heightening platform 7, and the heightening platform 7 is fixedly connected with the lower part of the horizontal shaft 1 so as to adapt to the requirements of different sizes of dead space heights.

The front end of the conical horn antenna 8 is provided with a flat plate with a fixed position, the flat plate is pasted with a wave absorbing material, when the polarization axis rotates, the flat plate also rotates along with the polarization axis, and the flat plate and the wave absorbing material on the flat plate are fixed with the phase position of the horn antenna.

It should be noted that the present invention is not limited to the type of horn antenna, and although the present embodiment adopts the conical horn antenna, other types of horn antennas besides the conical horn antenna can also be used in the present invention.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A scanning frame is characterized by comprising,

horizontal, vertical, polarization and radio frequency cables;

the upper surface of the horizontal shaft is provided with a sliding rail;

the lower end of the vertical shaft is connected with the slide rail in a sliding manner;

the vertical shaft is provided with a moving portion that slides in a vertical direction on the vertical shaft;

the polarization axis is fixed to the moving part;

the scanning frame also comprises an antenna and a radio frequency front end;

the polarization shaft is connected with the antenna through the radio frequency front end;

the polarization axis coincides with the rotation axis of the antenna.

2. The gantry of claim 1, further comprising,

a wire drag chain;

the wire drag chain is hollow;

the wire drag chain is used for accommodating the radio frequency cable;

the wire drag chain is used for bending and guiding the radio frequency cable in an appointed shape.

3. The gantry of claim 1,

the surfaces of the horizontal shaft and the vertical shaft are both provided with baffles;

wave-absorbing materials are attached to the baffle.

4. The gantry of claim 1, further comprising,

a network analyzer;

the antenna or the radio frequency front end is connected with the network analyzer through an electric signal.

5. The gantry of claim 1, further comprising,

a height increasing platform;

the height increasing table is fixedly connected with the lower part of the horizontal shaft and is used for being suitable for quiet zone tests at different heights.

6. The gantry of claim 1,

the antenna is a conical horn antenna.

7. The gantry of claim 6,

the front end of the conical horn antenna is provided with a flat plate with a fixed position, and the flat plate is pasted with wave-absorbing materials.