LCQ POSITION MARKERS

The present disclosure relates to device tracking. Described is an improved passive marker device (10). The passive marker device (10) comprises a coil element (12), a mechanical resonator (14), and a circuit element (16). The coil element is coupled to the mechanical resonator for producing a response signal having an operating frequency corresponding a mechanical resonating frequency of the mechanical resonator and a signal decay having a decay time constant in response to an excitation pulse, wherein the excitation pulse is a magnetic or electromagnetic excitation pulse. The circuit element is configured to limit a power transferred to the mechanical resonator when the at least one excitation pulse has an excitation amplitude equal to or greater than a threshold value.