| 摘要 |
A radio-frequency identification (RFID) transponder (tag) in accordance with the principles of the invention includes a hollowed monopole antenna. The hollowed monopole antenna is co-located on a substrate with RFID circuitry and a quarter wave transformer. The quarter wave transformer acts as a reference for the RFID circuitry. The monopole antenna may have a trapezoidal shape, such as triangular or rectangular, that increases the effective electrical length of the antenna without increasing its overall surface area.
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