Patent ID: 7696936

Claim:
Device (D) for determining at least one characteristic parameter (TR) of a resonant structure, including: a) a first antenna and b) a second antenna, and c) a retaining device for retaining the resonant structure at a location, said location being located in the far field of the first antenna and in the far field of the second antenna, d) a signal generator for generating an HF-signal (OUTS) with varying frequencies, wherein the HF-signal (OUTS) generated by the signal generator is transferable to the first antenna, said first antenna being provided for emitting electromagnetic waves (EEW) with varying frequencies to the resonant structure, said resonant structure takes care for modifying the emitted electromagnetic waves (EEW) and for achieving modified electromagnetic waves (MEW) and said second antenna being provided for receiving the generated modified electromagnetic waves (MEW), and e) a first determining device for determining a first electric power-value representative of the power associated with the emitted electromagnetic waves (EEW) emitted by the first antenna and for generating a first determining result f) a second determining device a for determining a second electric power-value representative of the power associated with the received modified electromagnetic waves (MEW) received by the second antenna and for generating a second determining result, and g) processing means for processing the first electric power-value and the second electric power-value and for determining the at least one characteristic parameter (TR) by using the first and second power-values.