| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless measuring system of a resonant element capable of being manufactured at a relatively low cost and easily, and improving wireless communication efficiency significantly even when a fluctuation range of the resonant element is wide.SOLUTION: A primary-side coil 11a and a secondary-side coil 11b are linked by magnetic field resonance. A resonant element 12 is connected in parallel to the secondary-side coil 11b. A load circuit 14 is composed of a capacitive load or an inductive load, and connected in series to the primary-side coil 11a. A wireless measuring system of a resonant element is configured so as to transmit a signal for resonating the resonant element 12 from the primary-side coil 11a side toward the secondary-side coil 11b side and passively detect a change in a resonant frequency of the resonant element 12 on the primary-side coil 11a side. The resonant frequency of the resonant element 12 is set to a frequency between the resonant frequency of the primary-side coil 11a and the secondary-side coil 11b and the series resonant frequency formed of the load circuit 14, the primary-side coil 11a, and the secondary-side coil 11b.SELECTED DRAWING: Figure 2 |
