Low Loss Wideband Acoustic Delay Line

摘要

This development has resulted in a programmable, planar folded acoustic path surface wave delay line with programmable delay times ranging from 94 microsecond to 105 microsecond in 1 microsecond increments. The delay line has a 60 MHz 3 dB passband ranging from 105 MHz to 165 MHz, and a dynamic range of 50 dB. The volume of the packaged device, including gain to offset the insertion loss and switches to obtain the programmable delay times, is five cubic inches. The planar, folded propagation path delay line having two sets of multistrip reflectors and track changers is fabricated on a YZ-lithium niobate plate. The propagation path length is about three times the active crystal length. Techniques used to fabricate the large field (5in. x 0.75in.), high resolution (130 lines/mm) photomask with an alignment compensation technique are discussed. (Author)