| http://www.w3.org/ns/prov#value | - In one embodiment of a passive transponder, shown in FIGS. 6 and 7, the internal circuit operates to convert the received signal S1 into an acoustic wave and then to reconvert the acoustic energy back into an electrical signal S2 for transmission via a dipole antenna 70, connected to, and arranged adjacent a SAW device made of a substrate 72 of piezoelectric material such as lithium niobate.
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