Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1993-08-04
1995-01-03
Hajec, Donald
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343703, 248183, H01Q 300
Patent
active
053790480
ABSTRACT:
An automatic tilt apparatus for use with electromagnetic emission testing devices. The apparatus enables the user to always bore-sight, that is, to point the antenna directly at the object being tested regardless of the height of the antenna. The apparatus utilizes a cam plate to achieve automatic tilting. A threaded rod, connected to the vertical drive mechanism of the testing device converts the rotary motion of the sprocket drive to a horizontal motion. The threaded rod is located within a boom that connects to the testing device. The linear, horizontal motion of the threaded rod causes a first bolt within a slot of the boom to move. A cam plate is attached to the carrier boom via the first bolt and a second bolt which is fastened through an arcuate slot in the cam. The motion of the first bolt causes the second bolt to follow the geometry of the acrucate slot, thus causing The cam plate to tilt in accordance with the vertical height of the testing device. An antenna boom and attached antenna will thus also point at the object being tested regardless of the vertical position of the testing device. Non-metallic materials are used throughout in order to avoid perturbing the electromagnetic field. Cam plates for testing devices uses different test heights can be easily removed and installed.
REFERENCES:
patent: 4201987 (1980-05-01), Tricoles et al.
patent: 4295621 (1981-10-01), Siryj
patent: 4931809 (1990-06-01), Putman et al.
patent: 5149029 (1992-09-01), Smith
Hajec Donald
Ho Tan
Ritchie W. B.
The Electro-Mechanics Company
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