| 摘要 |
The invention relates to a radio transponder (200) for reception and retransmission of electromagnetic energy, particularly in the microwave range. The transponder comprises a connection (210) to an antenna, a control circuit for modulation (260), a detector (250), a delay element (240) and a first semiconductor switch (220). The transponder comprises, in addition, a second semiconductor switch (230), and the control circuit for modulation (260) is arranged to be able to control the semiconductor switches (220, 230) independently in such a way that a signal that comes in via the antenna connection (210) can be caused to be reflected on either side of the delay element (240) or to pass through this to the detector (250). At least one of the semiconductor switches (220, 230) is suitably a diode or a transistor. |
