Title :
An improved method for the design of linear arrays with prescribed nulls
Author_Institution :
Shpak Comput. Eng. Ltd., Victoria, BC
Abstract :
A new L∞ optimal method for the synthesis of equispaced linear array functions with asymmetrical far-field pattern functions is proposed. This iterative method provides for the exact specification of the beam width while concurrently allowing for the specification of the relative levels of individual side lobes by index or as a function of bearing (e.g., angularly-extended nulls) as well as the realization of specified narrowband nulls. The resulting array factors are optimal in the weighted L∞ sense and, in general, have complex coefficients. This new Remez-type method employs multiple objective functions to provide the degrees of freedom that are required for exact null placement. Examples demonstrating the flexibility offered by the method are included for various sum and difference patterns including superdirective and shaped-beam arrays
Keywords :
antenna radiation patterns; directive antennas; iterative methods; linear antenna arrays; L∞ optimal method; Remez-type method; angularly-extended nulls; array factors; asymmetrical far-field pattern functions; beam width; bearing; design; difference patterns; equispaced linear array functions; iterative method; linear arrays; multiple objective function; shaped-beam arrays; side lobes; specified narrowband nulls; sum patterns; superdirective arrays; Adaptive systems; Algorithm design and analysis; Design methodology; Design optimization; Digital filters; Iterative methods; Linear programming; Narrowband; Null value; Optimization methods;
Conference_Titel :
OCEANS '95. MTS/IEEE. Challenges of Our Changing Global Environment. Conference Proceedings.
Conference_Location :
San Diego, CA
Print_ISBN :
0-933957-14-9
DOI :
10.1109/OCEANS.1995.528609