Title :
Linear arrays with variable interelement spacings
Author_Institution :
Granger Associates, Palo Alto, CA, USA
fDate :
3/1/1962 12:00:00 AM
Abstract :
Optimum broadside arrays with constant spacings, i.e., Dolph-Tchebycheff arrays, use relatively many elements and are often difficult to realize in practice due to mutual coupling effects. To overcome these disadvantages a variety of arrays with widely and variably spaced elements have been designed using both analog and digital computer techniques. These arrays all have many fewer elements than Dolph-Tchebycheff arrays with the same beamwidth and sidelobe level. One of the arrays designed has 21 elements and is 76 wavelengths long when used as a broadside array. The 3-db beamwidth is 0.74 degree, the sidelobe level -7.4 db. The array has perfect steerability in a 1.8:1 bandwidth with no interelement spacing smaller than one-half wavelength in this band. A Dolph-Tchebycheff array with the same beamwidth and sidelobe level uses 53 elements, and the steerability is not perfect even at a single frequency.
Keywords :
Nonuniformly spaced arrays; Antenna arrays; Antenna radiation patterns; Bandwidth; Contracts; Design methodology; Directional antennas; Frequency; Linear antenna arrays; Phased arrays;
Journal_Title :
Antennas and Propagation, IRE Transactions on
DOI :
10.1109/TAP.1962.1137832