1. Technical Field
The present disclosure relates to antenna holding devices, and particularly to an antenna holding device for electromagnetic measurements.
2. Description of Related Art
In electromagnetic measurements, such as electromagnetic interference (EMI) measurements, test antenna needs to be mounted on a predetermined measuring location relative to a tested product to transmit and/or receive test signals. Furthermore, many relevant parameters (e.g., heights, and tilted angles) of the test antenna often need to be adjusted. A horizontal distance between the adjusted test antenna and the tested product is required to be very precise. However, frequently adjusting the test antenna easily changes the horizontal distance. This may cause a large error in the measurement.
Therefore, there is room for improvement within the art.
Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the various drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the figures.
The antenna holding device 100 includes a base 10, a first mounting pole 20, a second mounting pole 30, a guiding pole 40 and an adjusting pole 60. The first mounting pole 20, the second mounting pole 30 and the guiding pole 40 are respectively mounted on the base 10. The tested antenna 50 is mounted on the adjusting pole 60. The adjusting pole 60 with the tested antenna 50 is slidably and rotatably assembled on the first mounting pole 20 and the second mounting pole 30, for allowing the tested antenna 50 to be raised or lowered. The adjusting pole 60 is mounted on the guiding pole 40 for guiding the adjusting pole 60 to secure an invariable horizontal distance between the tested antenna 50 and a tested product.
The base 10 is substantially a cuboid-shaped casing and includes a seat 12, a removable cover 14, and a plurality of foot wheels 16. The seat 12 defines a receiving cavity 120. Ends of the first mounting pole 20, the second mounting pole 30, and the guiding pole 40 are mounted in the receiving cavity 120. The cover 14 is mounted on the seat 12 for covering the receiving cavity 120. The foot wheels 16 are respectively rotatably mounted on four distal ends of the seat 12, and thus the base 10 can be horizontally moved due to rotation of the foot wheels 16.
A first belt 22, a first motor 24 and a first block 26 are positioned on the first mounting pole 20. The first block 26 is slidably positioned on the first mounting pole 20. The first block 26 is mounted with the first belt 22, and they are configured to move together. The first motor 24 is positioned in the receiving cavity 120, of the seat 12, and drives the first belt 22 to move for raising or lowering the first block 26 along the first mounting pole 20.
The second mounting pole 30 is similar to the first mounting pole 20 and includes a second belt 32, a second motor 34 and a second block 36. The second motor 34 has a different speed from the first motor 24. This structure allows the first belt 22 and the second belt 32 to have different speeds to move.
Two connecting members 62, a latching member 66 and a cylinder 70 are positioned on the adjusting pole 60. Each connecting member 62 has a pivot 622 and defines a central hole 624. The adjusting pole 60 slidably extends through the central hole 624. One pivot 622 is rotatably connected to the through hole 2662 of the first block 26. The other pivot 622 is rotatably connected to the second block 36. The latching member 66 includes a guiding portion 662. The cylinder 70 is configured for rotating the adjusting pole 60.
The guiding pole 40 is positioned between the first mounting pole 20 and the second mounting pole 30. A first end of the guiding pole 40 is adjacent to a bottom end of the first mounting pole 20, and a second end of the guiding pole 40 is adjacent to a top end of the second mounting pole 30. The guiding pole 40 defines a sliding groove 42. The guiding portion 662 is slidably received in the sliding groove 42. The sliding groove 42 is substantially arcuate. An arc angle of the sliding groove 42 is computed according to the distance of the tested antenna and the tested product and a variable height. The arc angle may secure a projection of a reference point of the tested antenna 50 on a ground to keep invariable.
During assembly of the antenna holding device 100, the ends of the first mounting pole 20, the second mounting pole 30 and the guiding pole 40 are mounted in the base 10. The first motor 24 and the second motor 34 are received in the receiving cavity 120 and are respectively connected to the first mounting pole 20 and the second mounting pole 30 for driving the first belt 22 and the second belt 32. The tested antenna 50 is mounted one end of the adjusting pole 60. The two connecting members 62 and the latching member 66 are attached to the adjusting pole 60. Each connecting member 62 is rotatably connected to the first block 26 and the second block 36. The guiding portion 662 of the latching member 66 is slidably received in the sliding groove 42.
In use, since the first motor 24 and the second motor 34 have different speeds, the tested antenna 50 may be adjusted to a predetermined tilted angle. The guiding pole 40 further secures an invariable horizontal distance for precisely adjusting the position of the antenna 50.
It is to be further understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of structures and functions of various embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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201210168258.3 | May 2012 | CN | national |