Biological information monitoring apparatus and magnetic resonance apparatus

A biological information monitoring apparatus, comprising:

• an antenna assembly including at least one antenna, the antenna assembly being configured to be disposed adjacent to an object;
• a signal generator configured to generate a high-frequency signal;
• and
• a displacement detection circuit configured to detect a physical displacement of the object based on the high-frequency signal,
• wherein the at least one antenna comprises a main antenna to which the high frequency signal is supplied and a parasitic element to which the high frequency signal is not supplied,
• the main antenna is configured as a planar dipole antenna having a first face and a second face;
• the parasitic element is configured as a planar conductor mounted on one of the first and second faces of the planar dipole antenna in such a manner that the parasitic element is insulated from a conductor of the planar dipole antenna;
• and
• the at least one antenna, which has a circuit, is configured to cause a parallel resonance between the main antenna and the parasitic element,
• wherein the circuit of the at least one antenna comprises a first series resonant circuit and a second series resonant circuit are connected in parallel,
• in the first series resonant circuit, which corresponds to the main antenna, a first inductor and a radiation resistor are connected in series, and
• in the second series resonant circuit, which corresponds to the parasitic element, a second capacitor and a second inductor are connected in series.