Patent ID: 9322904
Filing Date: 2016-04-26
CPC Classification: G01S,H01L,H04B

Claim Text:
1. A system comprising: a first amplifier for amplifying an output signal having an EHF frequency; a transducer operatively coupled to the first amplifier for converting the amplified output signal into an electromagnetic signal having the EHF frequency; and a proximity-sensing circuit, responsive to a reference and a composite signal conducted between the first amplifier and the transducer, for sensing the proximity of a transducer field-modifying device proximate to the transducer, the composite signal including the amplified output signal and any electromagnetic received signal received by the transducer and induced by the field-modifying device, wherein the reference is representative of a characteristic of the composite signal when the transducer field-modifying device is in a reference position, wherein the proximity-sensing circuit compares an amplitude of the reference signal with an amplitude of the composite signal, the proximity-sensing circuit comprising a reference circuit having a second amplifier and a terminating impedance coupled to an output of the amplifier, with the terminating impedance being equivalent to an impedance of the transducer when the transducer field-modifying device is in the reference position, the reference circuit generating the reference signal between the second amplifier and the terminating impedance.