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Blight the power: Jamming attack cripples wireless signals using clever reflective technology

Pat Att

It's passive in the sense that it's not generating any RF power of its own, and so is not detectable as a source of such power. A bit like how RFID tags in bank cards etc are passive - they modulate the impedance of the pickup coil, which is detectable by the transmit coil in the card reader, and so transmit energy without generating it. The term "semi-passive" is often used for such things.

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