IN-FIELD TEST OF MACROCELL ANTENNS FOR TILT AND PARTIAL RADIATION PATTERN
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-17
The measurement technique described here would dramatically simplify the task of establishing a macrocell antenna tilt and partially identify the antenna radiation characteristics in azimuth and ele- vation. Often the antennas installed in macrocell sites are too large to be tested individually in a suit- able environment such as anechoic chambers. The few antennas that are tested for radiation character- istics, usually have the test in a calibrated field where there are no objects in the vicinity of the antenna effecting the radiation characteristics, Therefore the antenna radiation characteristics on a practical mast, often in the vicinity of many other antennas and obstacles, would be different from that supplied by the manufactures. There is also the added problem of faulty antennas, tolerances and variations due to the manufacturing process which may alter the antenna behaviour from the specified one. Part of the cell planning is cell site antenna tilt. This tilt determines the coverage area of the cell and is one of the parameters in cell design. Although there are electrical, electromechanical and mechanical tilting mechanisms in operation now, on occasions it is desirable to establish the antenna tilt of a suspect sector which may be interfering with cochannel cells, or not covering the cell area according to plan. The aim of this technique is to establish the tilt and radi- ation pattern of a macrocell antenna, installed and operational at the cell site, as easily as possible.