. Circular-array radar antenna : Pencil-beam forming and phasing techniques. Radar; Antennas (Electronics). Figure 48. CARAMBA II azimuth pattern, 3-bit phase-board feed, f0. Some conclusions can be drawn from the results of the CARAMBA program: 1. Low-side-lobe, circular-array antenna patterns can be achieved using the R-2R lens fed with four input probes to obtain a tapered output distribution. Side lobes on the resulting radiation patterns are on the order of -25 dB over a 20-percent frequency band. 2. The use of digital amplitude and phase distributions obtained by means of diode technique
. Circular-array radar antenna : Pencil-beam forming and phasing techniques. Radar; Antennas (Electronics). Figure 48. CARAMBA II azimuth pattern, 3-bit phase-board feed, f0. Some conclusions can be drawn from the results of the CARAMBA program: 1. Low-side-lobe, circular-array antenna patterns can be achieved using the R-2R lens fed with four input probes to obtain a tapered output distribution. Side lobes on the resulting radiation patterns are on the order of -25 dB over a 20-percent frequency band. 2. The use of digital amplitude and phase distributions obtained by means of diode techniques gives radiation patterns which can be predicted by computer tech- niques, within the system errors. 3. The digital method is valuable as a research tool. Many combinations of amplitude and phase distributions .can be readily placed on the element terminals by means of amplitude and phase-control panels. As an example of the versatility of the digital method, figure 49 shows the difference pattern obtained from the array by simply advancing the phase-control switches on the panel 180°. Strictly speaking, independent control of the digital amplitude and phase is not possible, since a change of the amplitude bit results in a slight change of the phase, because of the physical construction of the phasor 43. 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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