Radio frequency IC device and radio communication system

A radio frequency IC device comprising:

• a radio IC;
• an interposer coupled to the radio IC and including a line electrode located on at least one principal surface of a base and/or inside the base;
• an annular electrode including at least a pair of end portions;
• and a dipole radiation plate coupled to the annular electrode;
• wherein
• the line electrode is coupled to at least one of the annular electrode and the radiation plate;
• a resonant frequency of the annular electrode is lower than a resonant frequency of the dipole radiation plate;
• both of the annular electrode and the dipole radiation plate define antenna elements;
• the annular electrode is a magnetic-field antenna element that communicates data of the radio IC using the lower resonant frequency;
• and
• the dipole radiation plate is an electric-field antenna element that communicates data of the radio IC using the higher resonant frequency.

A radio frequency IC device comprising:

• a radio IC;
• a feed circuit coupled to the radio IC, and including a resonant circuit including an inductance element and having a predetermined resonant frequency;
• an annular electrode including at least a pair of end portions and electromagnetically coupled to the feed circuit at the pair of end portions;
• and
• a dipole radiation plate coupled to the annular electrode;
• wherein
• a resonant frequency of the annular electrode is lower than a resonant frequency of the dipole radiation plate;
• both of the annular electrode and the dipole radiation plate define antenna elements;
• the annular electrode is a magnetic-field antenna element that communicates data of the radio IC using the lower resonant frequency;
• and
• the dipole radiation plate is an electric-field antenna element that communicates data of the radio IC using the higher resonant frequency.

A radio frequency IC device comprising:

• a radio IC;
• a magnetic-field radiation plate coupled to the radio IC and including at least a pair of end portions, the magnetic-field radiation plate communicates data of the radio IC using a resonant frequency of the magnetic-field radiation plate;
• and
• an electric-field radiation plate coupled to the magnetic-field radiation plate, the electric-field radiation plate communicates data of the radio IC using a resonant frequency of the electric-field radiation plate;
• wherein
• the resonant frequency of the magnetic-field radiation plate is lower than the resonant frequency of the electric-field radiation plate.

A radio frequency IC device comprising:

• a radio IC;
• an interposer coupled to the radio IC and including a line electrode located on at least one principal surface of a base and/or inside the base;
• a magnetic-field radiation plate including at least a pair of end portions, the magnetic-field radiation plate communicates data of the radio IC using a resonant frequency of the magnetic-field radiation plate;
• and
• an electric-field radiation plate coupled to the magnetic-field radiation plate, the electric-field radiation plate communicates data of the radio IC using a resonant frequency of the electric-field radiation plate;
• wherein
• the line electrode is coupled to at least one of the magnetic-field radiation plate and the electric-field radiation plate;
• wherein
• the resonant frequency of the magnetic-field radiation plate is lower than the resonant frequency of the electric-field radiation plate.

A radio frequency IC device comprising:

• a radio IC;
• a feed circuit coupled to the radio IC, and including a resonant circuit including an inductance element and having a predetermined resonant frequency;
• a magnetic-field radiation plate including at least a pair of end portions and electromagnetically coupled to the feed circuit at the pair of end portions, the magnetic-field radiation plate communicates data of the radio IC using a resonant frequency of the magnetic-field radiation plate;
• and
• an electric-field radiation plate coupled to the magnetic-field radiation plate, the electric-field radiation plate communicates data of the radio IC using a resonant frequency of the electric-field radiation plate;
• wherein
• the resonant frequency of the magnetic-field radiation plate is lower than the resonant frequency of the electric-field radiation plate.