US Patent 7552699 Transponding of a signal using the same antenna

An animal behavior modification system including a collar, a receiver device and a transponder. The receiver device is attached to the collar, the receiver device having a receiver circuit and a stimulation circuit. The transponder is in communication with the receiver device. The transponder is positioned proximate to the receiver device. The transponder includes a signal transmitter; and an antenna intermittently electrically connectable to the signal transmitter. The signal transmitter wirelessly communicating to the receiver circuit of the receiver device.