CONCLUSIONS 



As a result of the investigation of the possible use of linear-array tech- 

 niques to implement a circularly symmetric cylindrical array for wideband use, 

 some general conclusions can be drawn. Components developed for the linear 

 array can provide the necessary bandwidth and can be combined with circular- 

 array techniques to form pencil beams. If beam-pointing angles are to be indepen- 

 dent of frequency, then time-delay techniques can be used for elevation-beam 

 steering. However, a digital-phase system of the CARAMBA II type provides a 

 highly versatile tool for investigating the effects of amplitude and phase errors 

 on the pencil-beam shape, side-lobe level, and beam-pointing angle in the eleva- 

 tion plane. Computer results indicate that optimization of the excitation distribu- 

 tion for a given elevation angle can extend the sector in the elevation plane over 

 which the azimuth-beam maintains a useful shape. The implementation of this 

 type of cylindrical array appears feasible. 



RECOMMENDATIONS 



1. Investigate the implementation of a sector of a cylindrical array to produce 

 a pencil beam. 



2. Verify experimental computer predictions of optimum excitation distribu- 

 tions, and of elevation-scanning limitations and approximations. 



3. Investigate techniques to provide multi-aperture, multifrequency capability 

 to the cylindrical array. 



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