| 摘要 |
A wireless electromagnetic tracking system using a nonlinear passive transponder (10, 100) is provided. The transponder (10, 100) employs a coil (50, 150) connected in parallel with a diode (40, 140). The transponder (10, 100) emits a response signal when an excitation signal is incident upon the coil (50, 150) of the transponder (10, 100). Inclusion of the diode (40, 140) in the transponder circuit introduces nonlinear characteristics into the waveform of the response signal emitted by the transponder (10, 100). The nonlinear characteristics can be varied by changing the capacitance level of the transponder circuit. The nonlinear characteristics of the response signal can be used to discern the response signal from the excitation signal when both signals are received at a receiver. The nonlinear characteristics can also be utilized in a system of encoding data that is to be transmitted from a transponder (10, 100) to a receiver. |
