The bandwidth performance of a two-element adaptive array with tapped delay-line processing

The bandwidth performance of a two-element adaptive array with a tapped delay line behind each element is examined. It is shown how the number of taps and the delay between taps affect the bandwidth performance of the array. An array with two weights and one delay behind each element is found to yield optimal performance (equal to that obtained with continuous-wave interference) for any value of intertap delay between zero and T/sub 90//B, where T/sub 90/ is a quarter-wavelength delay time and B is the fractional signal bandwidth. Delays less that T/sub 90/ yield optimal performance but result in large array weights. Delays larger than T/sub 90//B yield suboptimal signal-to-interference-plus-noise ratio when each element has only two weights. For delays between T/sub 90//B and 4T/sub 90//B, the performance is suboptimal with only two taps but approaches the optimal if more taps are added to each element. Delays larger than T/sub 90//B result in suboptimal performance regardless of the number of taps used.<
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