A method for interrogating remote transponders having the steps of: sending an RF interrogation pulse from an interrogator (10), receiving by a first and second transponder (12,12a) the RF interrogation pulse, and establishing in a resonant circuit (130) of each of the transponders (12,12a) an oscillation,...http://www.google.de/patents/US5550548?utm_source=gb-gplus-sharePatent US5550548 - Interrogator for detecting adjacent transponders
