| 摘要 |
Radio signal emitting node (25,38) is configured to emit a radio signal with a radio emission power when buried in soil (10), said node (25, 38) comprising an antenna (20, 39), an integrated electronic circuit (22) being electrically connected to the antenna (20, 39) using a feed line (15, 17, 18),and at least one sensor (30) for generating measurement data (31). The integrated circuit (22) is configured to operate the antenna (20, 39) to emit the radio signal containing said measurement data (31) periodically or upon receiving a wireless request (32). The radio signal emitting node (25, 38) has been configured to allow a surrounding medium of the soil (10) to influence the near field of the antenna (20, 39), when said node (25, 38) is buried in soil (10). It has further been configured to decrease the radio emission power or to prevent the radio signal emission in case the influence of the surrounding medium onto the near field is withdrawn, when said node (25, 38) is removed from the soil |
