Wideband Compressive Receivers

■ Wideband compressive receivers are an attractive application of analog hightransition temperature superconductive (HTS) microwave filters. Chirp filters form the basis of compressive receivers, implementing a chirp-transform algorithm in the analog domain for real-time spectral analysis. HTS tappeddelay-line chirp filters are an enabling technology for instantaneous bandwidths greater than 1 GHz, and have evolved sufficiently to support dispersive delays as long as 40 nsec with multigigahertz bandwidths and time-bandwidth products in excess of 100. Long dispersive delays have been obtained by using a bonded/ thinned-wafer technique to fabricate YBa 2 Cu 3 O 7–δ stripline devices on 5-milthick, 2-in-diameter LaAlO 3 substrates. These filters have produced better than –18-dB error sidelobes. In addition, a 3-GHz-bandwidth HTS compressive cueing receiver was recently delivered to the Naval Research Laboratory to be flown on the High-Temperature Superconductivity Space Experiment (HTSSE), and demonstrations have been performed by combining HTS chirp filters with conventional compressive-receiver hardware. We propose a novel compressiv