Superdirectivity and SNR Constraints in Wideband
- Dan P. Scholnik
J. O. Coleman
Wide instantaneous- and tunable-bandwidth arrays pose
a challenging design problem. Since the elements are
usually spaced close to one-half wavelength at the
highest frequency of operation, at lower frequencies
the array may be considerably oversampled spatially.
In a conventional time-delay-steered array the result
is a beamwidth that is proportional to frequency.
With an FIR filter at each element, however,
superdirectivity can be achieved at lower frequencies,
improving the beam characteristics. Constraints on
efficiency, sensitivity, and SNR are derived to limit
the undesirable effects of superdirectivity.
- DOWNLOADABLE PREPRINT:
- Presented at the IEEE Radar Conference (RADAR
2001), Atlanta GA, USA, May 2001.
- DATE OF ENTRY: