© The Institution of Electrical Engineers
The use of 3 dB hybrid power dividers/combiners at the input and output of a pair of surface-acoustic-wave delay lines can give combined suppression of triple-transit signals and bulk-wave responses. Typically, the triple-transit signal is reduced by 20 dB and the bulk-wave responses by 15 dB compared with an unmodified delay line.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19800109
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