摘要 |
Apparatus and methods for providing a substantially surface independent tagging system are disclosed. A resonant dielectric cavity (6) is defined between upper (2) and lower (4) conducting layers, and closed at one end by a conducting base portion (8). Incident radiation couples into the cavity and is resonantly enhanced. An electronic device or tag paced at the edge of the cavity experiences a high electric field strength on account of this enhancement and is driven into operation. |