Biological information monitoring apparatus and MRI apparatus

A biological information monitoring apparatus, comprising:

• an antenna assembly including a transmission antenna and a reception antenna, the antenna assembly being disposed close to an object;
• a signal generator configured to generate a radio-frequency (RF) signal;
• a displacement detection circuit configured to detect a physical displacement of the object based on the RF signal;
• and
• a diversity determination circuit configured to perform switching so as to detect either a reflected signal from the reception antenna or a transmitted signal transmitted from the transmission antenna to the reception antenna, the detected signal corresponding to the physical displacement of the object,
• wherein each of the antennas comprises:
• a dipole antenna having a feeding point to be supplied with the RF signal, the feeding point being positioned in a center of the dipole antenna;
• a coaxial line configured to supply the RF signal to the feeding point;
• and
• a conductor element that has a length of ¼ wavelength of a resonance frequency of the dipole antenna, is short-circuited on one end to an outer conductor of the coaxial line, and is formed in a triangular shape with a planar structure.

A biological information monitoring apparatus, comprising:

• an antenna assembly including a transmission antenna and a reception antenna, the antenna assembly being disposed close to an object;
• a signal generator configured to generate a radio-frequency (RF) signal;
• a displacement detection circuit configured to detect a physical displacement of the object based on the RF signal;
• and
• a diversity determination circuit configured to perform switching so as to detect either a reflected signal from the reception antenna or a transmitted signal transmitted from the transmission antenna to the reception antenna, the detected signal corresponding to the physical displacement of the object,
• wherein each of the antennas comprises:
• a dipole antenna having a feeding point to be supplied with the RF signal, the feeding point being positioned in a center of the dipole antenna;
• a coaxial line configured to supply the RF signal to the feeding point;
• and
• a conductor element that has a length of ¼ wavelength of a resonance frequency of the dipole antenna, is short-circuited on one end to an outer conductor of the coaxial line, and is formed in a spiral shape.