Title :
Correction of RAC phase response by Langmuir-Blodgett films
Author_Institution :
Thorn EMI Central Res. Lab., Oxford, UK
Abstract :
The correction of the phase versus frequency characteristic of SAW (surface acoustic wave) RAC (reflecting array compressor) and ILRAC (in-line RAC) pulse compressors using Langmuir-Blodgett films (LBFs) is reported. Without recourse to photolithography, an accurate, stepped thickness profile is easily deposited, correcting a position-dependent velocity error. The equations giving the required LBF profile are presented, and the limitation of LBF thickness to a positive, integer number of molecular layers is allowed for. Experimental results are presented of a device in which simulated compressed pulse sidelobes are reduced by 19 dB
Keywords :
Langmuir-Blodgett films; surface acoustic wave devices; Langmuir-Blodgett films; SAW; compressed pulse sidelobes; molecular layers; position-dependent velocity error; pulse compressors; reflecting array compressor; surface acoustic wave; Acoustic arrays; Acoustic pulses; Acoustic waves; Error correction; Frequency; Lithography; Optical films; Phased arrays; Pulse compression methods; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49362
