Frequency-independent geometry for a two-dimensional phased array

This paper presents a log-periodic phased-array (LPPA) geometry that does not attempt to simulate the conventional periodic grid. It is a very simple geometry that provides arbitrarily large bandwidth and frequency-independent performance without grating lobes. The array can be fed and scanned like conventional arrays. Since the array is sparse, the sidelobe levels may be higher than those of conventional arrays, but broadband, closely packed elements can provide very reasonable sidelobe levels.