| 摘要 |
PURPOSE:To achieve simple construction and ease of manufacture, by coupling a magnetic resonance element to a signal line, one end of which is made to a nonreflection terminal, and picking up a signal with the same frequency only as the resonance frequency through reflection at the coupling point. CONSTITUTION:A coil 13 is connected in series with a signal line 8, in which one end is taken as an input terminal 9 and a resistor 11 is connected to another end to be nonreflection terminal 12, and a magnetic resonancne element 1 is coupled. A means 14 to which a magnetic field H is applied and from which a reflection wave from the element 1 is picked up, is inserted to the element 1. A signal given to the input terminal 9 is transmitted to the nonreflection terminal 12, and a signal with frequencies other than the resonance frequency of the element 1 passes through the coil 13 and is absorbed to the nonreflection terminal 12. But a signal with the same frequency as the resonance frequency of the element 1 is reflected at the coil 13 and branched at a reflection wave pickup means and outputted at an output terminal 15. |
