| 摘要 |
<p>Antenna, especially suitable for communication with an RFID tag, comprising a first double quad antenna having closed squares (1,2) which meet at one vertex and are cut open at that location (A, B) and interconnected two by two. A second double quad antenna is provided, equal to the first one, which is rotated a quarter of a turn with respect to the first antenna around an imaginary axis through the common vertices of both double quad antennas. The quads (1, 2) of the first antenna and the quads (3, 4) of the second antenna may be located in planes which are somewhat underneath each other. An RF signal source may be connected to the vertices (A, B) of the first double quad antenna and, moreover, to those (C, D) of the second double quad antenna, e.g. via a propagation delay element realizing a phase shift which causes a circular or oval RF field.</p> |
