[nmarquardt] has put up an fascinating instructable that covers building RFID tags. many of them are built utilizing adhesive copper tape on cardstock. The very first version just has a cap as well as a low power LED to show that the antenna is getting power. The next iteration utilizes tilt switches so the label is only active in specific orientations. The final thought shows a number of different variations: different antenna lengths, conductive paint, light triggered as well as more.
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