| 摘要 |
The invention provides a piezo-electric tag (10, 300) in the form of a card, the tag (10, 300) incorporating a first dipole antenna (20), a first rectification circuit (30), a piezo-electric transformer (40), a second rectification circuit (50) and a transponder circuit (60). In operation, the antenna (20) receives incoming radiation and generates a corresponding signa l Sa which propagates to the first circuit (30) which demodulates and filters it to generate a signal Sb. The signal Sb is applied to the transformer (40) to excite it. The transformer (40) increases the voltage amplitude of the signa l Sb by generating a relatively higher voltage amplitude signal Sc which is us ed in the tag (10, 300) to generate a signal Sd for supplying power to the transponder (60). The transformer (40) provides voltage magnitude enhancemen t to generate potentials suitable for operating active electronic circuits incorporated into the tag (10, 300). The tag can be personnel wearable and even adapted for permanent inclusion into biological systems.
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