发明名称 |
METHOD AND CIRCUIT OF AN ACTIVELY TRANSMITTING TAG |
摘要 |
An actively transmitting tag detects a shift of a phase of an antenna signal (as) with regard to a phase of a transmitted signal (ts) in time intervals with a length of one half-period of a subcarrier, in which time intervals it transmits high-frequency wave packets with their phase being inverted according to a communication protocol at the ends of said half-periods. Generation of said wave packets is controlled by said phase shift in a way that said phase shift retains its absolute value at transitions into subsequent half-periods. Synchronizing the tag's transmission to a received interrogator signal carried out even during tag's transmitting enables the tag to transmit according to protocol ISO 14443 B by inverting a phase at transitions between said half-periods. Said synchronizing is carried out although no time window without a tag transmitting exists within the transmitted data frame. |
申请公布号 |
EP2946342(A1) |
申请公布日期 |
2015.11.25 |
申请号 |
EP20140700488 |
申请日期 |
2014.01.14 |
申请人 |
AMS AG |
发明人 |
KUNC, VINKO;STIGLIC, MAKSIMILJAN;KOVACIC, KOSTA;PEVEC, ALBIN;STERN, ANTON |
分类号 |
G06K7/10;G06K19/07;H04B5/00 |
主分类号 |
G06K7/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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