| 摘要 |
An embodiment of the present invention provides an apparatus, comprising an antenna capable of taking listen-before-talk (LBT) measurements. The antenna may further comprise an active peak/envelope detector, a comparator, and a bias-tee for extracting DC off of a coaxial feed feeding the antenna. In an embodiment of the present invention, the apparatus may further comprise a radio transceiver including a current source, a bias tee, and a current sense circuit for detecting behavior of the antenna.
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