| 摘要 |
An RF antenna includes an input terminal for receiving an RF signal, a supporting element, an electrically conductive coil on the supporting element and disposed to receive the RF signal from the input terminal, and an RF shield formed of an electrically conductive material and disposed under the coil and further including contacts for connection to a ground electrical potential. The antenna generates a circularly polarized RF field. A method of generating an RF field includes generating an RF signal, providing the RF signal to an electrically conductive coil disposed on a magnet core and separated from the magnet core by a supporting element, shielding the electrically conductive coil using an electrically conductive material, and connecting the RF shield to a ground electrical potential so as to provide a current return for the RF signal through the RF shield. The supporting element may be a cross-shaped plastic spacer, which may include a first segment and a second segment, such that a first electrically conductive coil is disposed on the first segment to receive a first RF signal, and a second electrically conductive coil is disposed on the second segment to receive a second RF signal.
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