Patent ID: 7245876

Claim:
A secure wireless communication system comprising: a first portion comprising a first inductor having a first end and a second end; a second portion comprising a second inductor having a third end and a fourth end, wherein said first portion and said second portion define a gap therebetween, and wireless communication is achieved across said gap through mutual inductance between said first inductor and said second inductor by aligning said first end with said third end, and said second end with said fourth end; and detection circuitry for determining if said first portion and said second portion are within communication range of each other, said detection circuitry comprising: a termination resistance electrically coupled to said first inductor, said termination-resistance configured to provide a reflected impedance signal from said first inductor to said second inductor responsive to a detection signal; and a comparator electrically coupled to said second inductor and configured to receive said detection signal, wherein: said comparator compares said detection signal with said reflected impedance signal to determine if said first portion and said second portion are within communication range of each other.