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Surface acoustic waves (SAWs) demonstrate simplicity of their
excitation and receipt, as well as their availability to all
propagation ways of signal branching and processing. SAW devices
are divided into several main classes: filters for signal
processing at intermediate frequencies, delay lines, resonators,
filters with low losses for the input circuits of receiver, and
antenna duplexers for the connected receivers. The SAW devices are
not only able to conduct an effective signal processing, but also
serve as a basis for multi-subsystems (matched filtering, signal
processing, real-time Fourier transform processors, etc.).
Additionally, SAW filters help scientists to realise the wide
variety of frequency characteristics. Besides their unique
electrical characteristics, SAW devices favorably differ from their
analogs in small size, mechanical strength and high reliability,
due to the quality of raw materials and their processing. The use
of the photolithography and the achievements of group
microelectronic technology in their production allow a researcher
to achieve good reproducibility of parameters at relatively low
cost. In addition, currently SAW devices are widely used in various
sensors based on the SAW radio frequency identification. This book
presents an attempt to generalise a multi-year experience on
R&D of SAW devices. It develops original approaches directed at
discovering solutions of technical problems, as development of
various SAW devices are patented in Russia. Moreover, the book
presents some experimental and theoretical research results.
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