Antenna near-field testing device

Abstract

The invention relates to the field of antenna near-field testing, and discloses an antenna near-field testing device which comprises a testing mechanism, the testing mechanism comprises a transverse support, a second cantilever is arranged on one side of the transverse support, a bearing column is arranged at the tail end of the second cantilever, a stand column support is installed on the transverse support, and a first cantilever is installed on the stand column support. A fixing ring is arranged at the tail end of the first cantilever, the axis of the fixing ring is vertically arranged, in the process that the stand column support drives the first cantilever to move together, the axis of the fixing ring can coincide with the axis of the bearing column, a rotating ring is coaxially arranged in the fixing ring in a sleeved mode, and a rail is arranged on the upper end face of the rotating ring. The track comprises two vertical sections and an arc-shaped section, the two vertical sections are vertically arranged and located on the two sides of the axis of the rotating ring respectively, the arc-shaped section is arranged between the upper ends of the two vertical sections, the axis of the arc-shaped section intersects with the axis of the fixing ring, a probe is installed on the track, and the probe can move on the track.

Description

Technical Field

[0001] The present invention relates to the field of antenna testing, and in particular to the field of antenna near-field testing. Background Art

[0002] Antenna near-field testing is one of the antenna testing methods. It can collect antenna amplitude and phase data at a relatively close distance and convert them into far-field characteristics through mathematical algorithms, reducing the requirements for large sites. It has the advantages of being able to measure indoors and working around the clock, avoiding errors caused by distance, and ensuring the accuracy and repeatability of test results. There are three common antenna near-field testing methods: plane scanning method, cylindrical scanning method, and spherical scanning method. When using, select the appropriate test method according to the type of antenna to be tested. For example, in the fields of satellite communications, radar detection, etc., the spherical scanning method is preferred, and in the fields of mobile phone base station antennas, etc. In the field of antenna testing, cylindrical scanning method is preferred, and in the fields of butterfly antenna, phased array antenna, etc., plane scanning method is preferred. Therefore, in the test center, three kinds of test equipment are generally required to test different types of antennas, and the cost is relatively high. In addition, when the spherical scanning method is used, it is necessary to ensure that the center of the antenna to be tested is placed as close to the center point of the spherical near field as possible to achieve the best test effect. However, different antennas have different sizes and it is difficult to be at the center point of the spherical near field. When the cylindrical or plane scanning method is used, the probe needs to be pulled to move at various points on the cylinder or plane, and the test efficiency is relatively low.

[0003] Based on the above, the present invention proposes an antenna near-field test device, which can improve the test effect or test efficiency of the plane, cylindrical or spherical scanning test while being able to perform a plane, cylindrical or spherical scanning test on the antenna. Summary of the invention

[0004] In order to solve the problems mentioned in the above background, the present invention provides an antenna near-field testing device.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0006] An antenna near-field test device comprises a test mechanism, wherein the test mechanism comprises a horizontal support, a second cantilever arranged horizontally is arranged on one side of the horizontal support, a supporting column arranged vertically is arranged at the end of the second cantilever, and the upper end of the supporting column is used to place an antenna to be tested; A column bracket is installed on the horizontal bracket, and the movement direction of the column bracket is arranged horizontally and perpendicular to the extension direction of the second cantilever. A first cantilever is installed on the column bracket, and the movement direction of the first cantilever is arranged vertically. A fixing ring is arranged at the end of the first cantilever, and the axis of the fixing ring is arranged vertically. In the process of the column bracket moving with the first cantilever, the axis of the fixing ring can coincide with the axis of the supporting column. A rotating ring is coaxially sleeved in the fixing ring, and a track is arranged on the upper end surface of the rotating ring. The track includes two vertical sections arranged vertically and located on both sides of the axis of the rotating ring and an arc section arranged between the upper ends of the two vertical sections. The axis of the arc section intersects with the axis of the fixed ring. A probe is installed on the track, and the probe can move on the track.

[0007] As a further improvement and optimization of the present invention, a second linear module for driving the column bracket to move is arranged on the cross bracket, a third linear module for driving the first cantilever to move is arranged on the column bracket, and a first motor for driving the rotating ring to rotate is arranged on the first cantilever.

[0008] As a further improvement and optimization of the present invention, a rack is provided on the track, the shape of the rack is consistent with the shape of the track and the sizes of the two are scaled in the same proportion; There is a connecting bracket outside the track, and a suspension bracket is slidably installed inside the connecting bracket, and the relative sliding direction between the suspension bracket and the connecting bracket is perpendicular to the extension direction of the track; The suspension bracket is located outside the track, and a roller is arranged on the suspension bracket, the axis of the roller is parallel to the axis of the arc section of the track, and the roller is tangent to the outer surface of the track; A gear is arranged on the connecting bracket, the gear is meshed with the rack, and a second motor for driving the gear to rotate is arranged on the connecting bracket.

[0009] As a further improvement and optimization of the present invention, a spring is provided between the connecting bracket and the suspension bracket, and the elastic force of the spring is used to bring the roller and the gear closer to each other.

[0010] As a further improvement and optimization of the present invention, two rollers are provided.

[0011] As a further improvement and optimization of the present invention, two suspension brackets are provided, and the two rollers are respectively provided on the two suspension brackets.

[0012] As a further improvement and optimization of the present invention, a connecting rod is installed on the connecting bracket, the extension direction of the connecting rod is perpendicular to the extension direction of the track, the connecting rod can move along the extension direction, and a first telescopic rod for driving the connecting rod to move is provided on the connecting bracket. One end of the connecting rod is connected to the probe, and the probe is located on the inner side of the track.

[0013] As a further improvement and optimization of the present invention, it also includes a shielding component, which is used to change the shielding coefficient of the area between the track and the supporting column.

[0014] As a further improvement and optimization of the present invention, the shielding assembly includes a shielding body, a second telescopic rod for driving the shielding body to move, and a first linear module for driving the cross bracket to move. The movement direction of the cross bracket is parallel to the extension direction of the second cantilever, and the movement direction of the shielding body is parallel to the movement direction of the column bracket. The interior of the shielding body is hollow, and an input pipe and an output pipe are arranged on the outer surface of the shielding body. A plurality of inlets are arranged in an array on the input pipe, and a plurality of outlets are arranged in an array on the output pipe, and an electromagnetic valve is arranged at each inlet and each outlet.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In summary, the present solution can test the antenna in a plane, cylindrical or spherical scanning manner through one test device, which is lower in cost. In addition, during the test process: a. During the spherical test, the distance parameter between the center of the antenna and the center point of the spherical near field can be obtained according to the known size of the antenna to be tested, and then according to the distance parameter, the position of the track is changed through the cooperation of the second linear module and the third linear module, so that the center point of the spherical near field coincides with the center of the antenna to be tested, thereby greatly improving the effect of the spherical scanning test; b. During the plane and cylindrical scanning test, since the direction of the reciprocating motion of the probe on the vertical section of the track is the same as the direction in which the third linear module drives the first cantilever to reciprocate, on the one hand, the movement speed of the probe is equal to the sum of the speed of the probe itself and the speed of the first cantilever, so the test efficiency is significantly improved, and on the other hand, the range of movement of the probe in the vertical direction is larger than that of the prior art, so the test effect is better; That is, this solution can not only combine the three scanning modes of plane, cylinder and spherical surface to reduce the cost, but also the three scanning modes promote each other to achieve the purpose of improving the test effect or test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 The structure of the present invention is schematically shown Figure 3 ; Figure 4 It is a schematic diagram of the structure of the test organization; Figure 5 A partial diagram of the test organization Figure 1 ; Figure 6 A partial diagram of the test organization Figure 2 ; Figure 7 A partial diagram of the test organization Figure 3 ; Figure 8 A schematic diagram of the structure of the shielding component.

[0017] The reference numerals in the accompanying drawings are: 100. Test mechanism; 101. First linear module; 102. Horizontal bracket; 103. Second linear module; 104. Column bracket; 105. Third linear module; 106. First cantilever; 107. Second cantilever; 108. Support column; 109. Fixed ring; 110. Rotating ring; 111. First motor; 112. Track; 113. Rack; 114. Connecting bracket; 115. Suspension bracket; 116. Gear; 117. Roller; 118. Spring; 119. Second motor; 120. First telescopic rod; 121. Connecting rod; 122. Probe; 200. Shielding assembly; 201. Shielding body; 202. Second telescopic rod; 203. Input pipe; 204. Output pipe. DETAILED DESCRIPTION

[0018] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0019] Embodiment 1 Reference Figure 1-Figure 7 An antenna near-field test device includes a test mechanism 100, which includes a horizontal bracket 102. A horizontally arranged second cantilever 107 is provided on one side of the horizontal bracket 102. A vertically arranged supporting column 108 is provided at the end of the second cantilever 107. The upper end of the supporting column 108 is used to place the antenna to be tested. The placement method can be achieved by the existing technology and will not be described in detail.

[0020] A column support 104 and a second linear module 103 for driving the column support 104 to move are installed on the transverse support 102 . The movement direction of the column support 104 is horizontally arranged and perpendicular to the extension direction of the second cantilever 107 .

[0021] A first cantilever 106 and a third linear module 105 for driving the first cantilever 106 to move are installed on the column bracket 104 . The moving direction of the first cantilever 106 is arranged vertically.

[0022] A fixing ring 109 is provided at the end of the first cantilever 106 , and the axis of the fixing ring 109 is arranged vertically. When the column bracket 104 moves with the first cantilever 106 , the axis of the fixing ring 109 can coincide with the axis of the supporting column 108 .

[0023] A rotating ring 110 is coaxially sleeved in the fixed ring 109 , and a first motor 111 for driving the rotating ring 110 to rotate is disposed on the first cantilever 106 .

[0024] A track 112 is provided on the upper end surface of the rotating ring 110. When the rotating ring 110 rotates, the track 112 will rotate together. The track 112 includes two vertical sections arranged vertically and located on both sides of the axis of the rotating ring 110, and an arc section arranged between the upper ends of the two vertical sections. The axis of the arc section intersects with the axis of the fixed ring 109.

[0025] A probe 122 is installed on the track 112 . The probe 122 can move on the track 112 and can be extended and retracted. The extension direction of the probe 122 is perpendicular to the extension direction of the track 112 .

[0026] In the first embodiment, the antenna can be tested by using a plane, cylinder or spherical scanning method, specifically: The antenna to be tested is placed on the upper end of the supporting column 108. Initially, the axis center line of the fixing ring 109 coincides with the axis center line of the supporting column 108. According to the known size of the antenna to be tested, the distance parameter between the center of the antenna and the center point of the spherical near field can be obtained. Then, according to the distance parameter, the position of the track 112 is changed by the cooperation of the second linear module 103 and the third linear module 105, so that the center point of the spherical near field can coincide with the center of the antenna to be tested. Finally, the rotating ring 110 is driven to rotate by the first motor 111. The rotating ring 110 rotates with the track 112 and the probe 122. At the same time, the probe 122 reciprocates on the arc segment of the track 112. The two cooperate to realize the spherical scanning test of the antenna to be tested. The antenna to be tested is placed on the upper end of the supporting column 108, and the rotating ring 110 is driven to rotate by the first motor 111. The rotating ring 110 rotates with the track 112 and the probe 122. At the same time, the probe 122 reciprocates on the vertical section of the track 112. At the same time, the third linear module 105 drives the first cantilever 106 to reciprocate in the vertical direction. The first cantilever 106 moves with the probe 122, and the movement direction of the first cantilever 106 is kept in the same direction as the movement direction of the probe 122 on the vertical section. The three cooperate to achieve a cylindrical scanning test of the antenna to be tested; The antenna to be tested is placed on the upper end of the supporting column 108, and the probe 122 reciprocates on the vertical section of the track 112. At the same time, the third linear module 105 drives the first cantilever 106 to reciprocate in the vertical direction, and the first cantilever 106 moves with the probe 122, and the movement direction of the first cantilever 106 is the same as the movement direction of the probe 122 on the vertical section. At the same time, the second linear module 103 drives the column bracket 104 to move, and the column bracket 104 moves with the probe 122. The three cooperate to achieve a plane scanning test of the antenna to be tested; In summary, the present solution can test the antenna in a plane, cylindrical or spherical scanning manner through one test device, which is lower in cost. In addition, during the test process: a. During the spherical test, the distance parameter between the center of the antenna and the center point of the spherical near field can be obtained according to the known size of the antenna to be tested, and then according to the distance parameter, the position of the track is changed through the cooperation of the second linear module and the third linear module, so that the center point of the spherical near field coincides with the center of the antenna to be tested, thereby greatly improving the effect of the spherical scanning test; b. During the plane and cylindrical scanning test, since the direction of the reciprocating motion of the probe on the vertical section of the track is the same as the direction in which the third linear module drives the first cantilever to reciprocate, on the one hand, the movement speed of the probe is equal to the sum of the speed of the probe itself and the speed of the first cantilever, so the test efficiency is significantly improved, and on the other hand, the range of movement of the probe in the vertical direction is larger than that of the prior art, so the test effect is better.

[0027] That is, this solution can not only combine the three scanning modes of plane, cylinder and spherical surface to reduce costs, but also the three scanning modes promote each other to improve the test effect or test efficiency.

[0028] Further, see Figure 5-Figure 7 A rack 113 is provided on the track 112 , and the shape of the rack 113 is consistent with the shape of the track 112 , and the sizes of the two are scaled in the same proportion.

[0029] A connecting bracket 114 is provided outside the track 112 , and a suspension bracket 115 is slidably installed inside the connecting bracket 114 . The relative sliding direction between the suspension bracket 115 and the connecting bracket 114 is perpendicular to the extending direction of the track 112 .

[0030] The suspension bracket 115 is located outside the track 112 . A roller 117 is disposed on the suspension bracket 115 . The axis of the roller 117 is parallel to the axis of the arc segment of the track 112 . The roller 117 is tangent to the outer surface of the track 112 . Two rollers 117 are disposed.

[0031] A gear 116 is disposed on the connecting bracket 114 , and the gear 116 is meshed with the rack 113 . A second motor 119 for driving the gear 116 to rotate is disposed on the connecting bracket 114 .

[0032] A spring 118 is provided between the connecting bracket 114 and the suspension bracket 115. The elastic force of the spring 118 is used to cause relative movement between the connecting bracket 114 and the suspension bracket 115, so that the roller 117 and the gear 116 are close to each other, and the gear 116 and the rack 113 are kept in meshing. The gear 116 is driven to rotate by the second motor 119, which can drive the connecting bracket 114 and the suspension bracket 115 to move on the track 112.

[0033] Furthermore, two suspension brackets 115 are provided, and two rollers 117 are respectively provided on the two suspension brackets 115. The significance of this is that during the movement, the following situation exists: one roller 117 is located on the arc segment of the track 112, and the other roller 117 is located on the vertical segment of the track 112. In this case, if the two rollers 117 are located on the same suspension bracket 115, then although it does not affect the movement of the connecting bracket 114 and the suspension bracket 115 on the track 112, an assembly gap needs to be reserved for the transition of the roller 117 between the arc segment and the vertical segment, and the movement accuracy is relatively low. On the other hand, in this solution, the two rollers 117 are respectively provided on the two suspension brackets 115. In this case, no assembly gap needs to be reserved, and the roller 117 can also complete a smooth transition between the arc segment and the vertical segment, and the movement accuracy is higher. The higher the movement accuracy, the more conducive to the scanning test of the antenna.

[0034] Furthermore, a connecting rod 121 is installed on the connecting bracket 114, and the extension direction of the connecting rod 121 is perpendicular to the extension direction of the track 112. The connecting rod 121 can move along the extension direction. The connecting bracket 114 is provided with a first telescopic rod 120 for driving the connecting rod 121 to move. The existing electric telescopic rod technology can be adopted, and details are not given here. One end of the connecting rod 121 is connected to the probe 122, and the probe 122 is located on the inner side of the track 112. Its significance is that the distance between the probe 122 and the antenna to be tested can be changed.

[0035] Embodiment 2 When the antenna is actually used, there will inevitably be shielding media such as buildings and trees between the antenna and the receiving device. Figure 1 and Figure 8 The testing device further includes a first linear module 101 for driving the horizontal support 102 to move, and the movement direction of the horizontal support 102 is parallel to the extension direction of the second cantilever 107 .

[0036] The test device also includes a shielding assembly 200, which includes a shielding body 201 and a second telescopic rod 202 for driving the shielding body 201 to move. The movement direction of the shielding body 201 is parallel to the movement direction of the column bracket 104. The interior of the shielding body 201 is hollow, and an input pipe 203 and an output pipe 204 are arranged on the outer surface of the shielding body 201. A plurality of inlets are arranged in an array on the input pipe 203, and a plurality of outlets are arranged in an array on the output pipe 204. A solenoid valve is arranged at each inlet and each outlet. The significance of this is that, through the cooperation of multiple solenoid valves, shielding media with different shielding coefficients can be injected into the shielding body 201, and then, through the cooperation of the first linear module 101 and the second telescopic rod 202, the shielding body 201 can be located between the track 112 and the supporting column 108, so that a shielding medium with an adjustable shielding coefficient exists between the antenna and the probe 122.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An antenna near-field test device, comprising a test mechanism (100), characterized in that: The testing mechanism (100) comprises a transverse support (102), a second cantilever (107) arranged horizontally is provided on one side of the transverse support (102), a supporting column (108) arranged vertically is provided at the end of the second cantilever (107), and the upper end of the supporting column (108) is used to place an antenna to be tested; A column support (104) is mounted on the transverse support (102), the movement direction of the column support (104) is arranged horizontally and is perpendicular to the extension direction of the second cantilever (107), a first cantilever (106) is mounted on the column support (104), the movement direction of the first cantilever (106) is arranged vertically, a fixing ring (109) is arranged at the end of the first cantilever (106), the axis of the fixing ring (109) is arranged vertically, and when the column support (104) moves with the first cantilever (106), the axis of the fixing ring (109) can coincide with the axis of the supporting column (108), a rotating ring (110) is coaxially sleeved inside the fixing ring (109), and a track (112) is arranged on the upper end surface of the rotating ring (110); The track (112) comprises two vertical sections arranged vertically and respectively located on both sides of the axis of the rotating ring (110), and an arc section arranged between the upper ends of the two vertical sections, the axis of the arc section intersecting with the axis of the fixed ring (109), and a probe (122) is installed on the track (112), and the probe (122) can move on the track (112).

2. The antenna near-field test device according to claim 1, characterized in that: The transverse support (102) is provided with a second linear module (103) for driving the column support (104) to move, the column support (104) is provided with a third linear module (105) for driving the first cantilever (106) to move, and the first cantilever (106) is provided with a first motor (111) for driving the rotating ring (110) to rotate.

3. The antenna near-field test device according to claim 1, characterized in that: A rack (113) is provided on the track (112), the shape of the rack (113) is consistent with the shape of the track (112), and the sizes of the two are scaled in the same proportion; A connecting bracket (114) is provided outside the track (112), a suspension bracket (115) is slidably mounted inside the connecting bracket (114), and a relative sliding direction between the suspension bracket (115) and the connecting bracket (114) is perpendicular to an extension direction of the track (112); The suspension bracket (115) is located outside the track (112), and a roller (117) is provided on the suspension bracket (115). The axis of the roller (117) is parallel to the axis of the arc segment of the track (112), and the roller (117) is tangent to the outer surface of the track (112); A gear (116) is provided on the connecting bracket (114), the gear (116) is meshed with the rack (113), and a second motor (119) for driving the gear (116) to rotate is provided on the connecting bracket (114).

4. The antenna near-field test device according to claim 3, characterized in that: A spring (118) is provided between the connecting bracket (114) and the suspension bracket (115), and the elastic force of the spring (118) is used to bring the roller (117) and the gear (116) closer to each other.

5. The antenna near-field test device according to claim 3, characterized in that: Two rollers (117) are provided.

6. The antenna near-field test device according to claim 5, characterized in that: Two suspension brackets (115) are provided, and the two rollers (117) are respectively provided on the two suspension brackets (115).

7. The antenna near-field test device according to claim 4, characterized in that: A connecting rod (121) is mounted on the connecting bracket (114); the extending direction of the connecting rod (121) is perpendicular to the extending direction of the track (112); the connecting rod (121) can move along the extending direction; a first telescopic rod (120) for driving the connecting rod (121) to move is disposed on the connecting bracket (114); one end of the connecting rod (121) is connected to a probe (122); and the probe (122) is located on the inner side of the track (112).

8. The antenna near-field test device according to claim 3, characterized in that: Also included is a shielding assembly (200), which is used to change the shielding coefficient of the area between the track (112) and the supporting column (108).

9. The antenna near-field test device according to claim 8, characterized in that: The shielding assembly (200) comprises a shielding body (201), a second telescopic rod (202) for driving the shielding body (201) to move, and a first linear module (101) for driving the cross support (102) to move, the movement direction of the cross support (102) being parallel to the extension direction of the second cantilever (107), the movement direction of the shielding body (201) being parallel to the movement direction of the column support (104), the interior of the shielding body (201) being hollow, an input pipe (203) and an output pipe (204) being arranged on the outer surface of the shielding body (201), a plurality of inlets being arranged in an array on the input pipe (203), a plurality of outlets being arranged in an array on the output pipe (204), and a solenoid valve being arranged at each inlet and each outlet.

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