Applications of RF aperture-array spatially-bandpass 2-D IIR filters in sub-Nyquist spectrum sensing, wideband doppler radar and radio astronomy beamforming. - Arjuna Madanayake; Tharindu Randeny; Nilan Udayanga; Arindam Sengupta; Glenn Jones; Chamith Wijenayake; Len T. Bruton (Multidimens. Syst. Signal Process., 2017)