| 摘要 |
A radio frequency identification tag (16) includes stored tag information (56) and at least one antenna element (30). The tag also includes a programmable tag circuit state that is either "on" or "off" based on an "on/off" command signal (35) received by the antenna element. When the tag circuit state is "on," upon receiving an exciter signal (34) from a proximately-located electrostatic exciter (12), the tag becomes energized, thereby causing it to generate a read signal (38) containing a carrier signal (58) and based on the stored tag information. The antenna element then electrostatically sends the read signal to a proximately-located reader (14), which detects the carrier signal and, under proper conditions, also the stored tag information.
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