. Circular-array radar antenna : Pencil-beam forming and phasing techniques. Radar; Antennas (Electronics). board. This is not considered serious, since on the final system the amplitude would remain fixed after the optimum value has been determined. Another effect is observed if all of the phases are advanced by the same value: since the num- ber of phase errors between bits is not the same for all bits, changes in the radia- tion pattern occur as the beam is scanned through 360°. This effect will also be minimized if a phase-trimming scheme is used in the system. As in the case of the matrix
. Circular-array radar antenna : Pencil-beam forming and phasing techniques. Radar; Antennas (Electronics). board. This is not considered serious, since on the final system the amplitude would remain fixed after the optimum value has been determined. Another effect is observed if all of the phases are advanced by the same value: since the num- ber of phase errors between bits is not the same for all bits, changes in the radia- tion pattern occur as the beam is scanned through 360°. This effect will also be minimized if a phase-trimming scheme is used in the system. As in the case of the matrix previously discussed, the phasor board is a discrete phase-step device and will be subject to changes in beam-pointing direction as the frequency is changed. This is not a serious problem for the circular array, but for elevation scanning it would be a factor to be 0° ANGLE (°) 180° Figure 49. CARAMBA IT azimuth difference pattern obtained by advancing phase-control switches 180°, fa. 14. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Provencher, J. H; Munger, A. D; Naval Electronics Laboratory Center. San Diego, Calif. : Naval Electronics Laboratory Center
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