Performance Limits of a Dual-Acoustic-Channel Surface-Acoustic-Wave (SAW) Interferometer.

摘要

Design, construction, and performance of a dual-acoustic-channel interferometer, capable of placing nulls spaced every 150 kHz from 329.15 to 335 MHz, are described. The prototype device constructed exhibited a minimum null depth for 40 consecutive nulls of 33 dB, with more than half the nulls being 45 dB or more. Midband insertion loss was 27 dB. Second-order effects, such as spurious signals, required some design tradeoffs. Slight modifications of the prototype should enable 50 dB nulls to be achieved with an insertion loss of 20 dB. (Author)