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Antenna patterns can be designed to have broad notches in regions where clutter and jamming are expected to be received. A number of narrowband pattern synthesis techniques exist to design notched antenna patterns, but they break down in the presence of wideband signals on arrays which employ a combination of phase and time steering. The authors derive definitions for wideband antenna patterns and present a new synthesis procedure which can be used to design notched patterns for signals having specified bandwidths on any type of array.

Spectral analysis of the environment, often called sniffing, is used to find a clear operating band in radar and communication systems. In this paper, the authors show that the sniffing technique can be used to null multiple broad-band sidelobe jammers by exploiting the transfer function of the antenna. Analysis and computer simulation are used to demonstrate performance.

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