RADIO FREQUENCY IC DEVICE AND RADIO COMMUNICATION SYSTEM

• US 20100302013A1
• Filed: 08/19/2010
• Published: 12/02/2010
• Est. Priority Date: 03/03/2008
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: KATO, Noboru, IKEMOTO, Nobuo
• Granted Patent: US 8,797,148 B2
• Time in Patent Office: Days
• US Class Current: 340/10.51
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07767 the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies
• CPC Class Codes: G06K 19/07777 the antenna being of the inductive type
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: H01L 2224/0401 Bonding areas specifically adapted for bump connectors, e.g. under bump metallisation [UBM]
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/24 Shunt feed arrangements to single active elements, e.g. for delta matching

Abstract

A radio frequency IC device achieves impedance matching between a radio IC chip and a radiation plate in a wide frequency band, and achieves desired radiation characteristics over a wide range of frequencies. A radio frequency IC device and a radio communication system allow both long-distance and short-distance communication and, in particular, allow short-distance communication using a small amount of energy. The radio frequency IC device includes an electromagnetic coupling module including a radio IC chip and a feed circuit board, and a radiation plate. An annular electrode is arranged to be coupled to both a feed circuit of the electromagnetic coupling module and the radiation plate. The radiation plate defines an electric-field radiation plate for long-distance communication, while the annular electrode defines a magnetic-field radiation plate for short-distance communication. The feed circuit board may be removed, so that the radio IC chip is coupled to the annular electrode directly or with an interposer disposed therebetween.

Claims

1. A radio frequency IC device comprising:

a radio IC;

an annular electrode coupled to the radio IC and including at least a pair of end portions; and

a dipole radiation plate coupled to the annular electrode.

5. The radio frequency IC device according to claim 1, wherein a resonant frequency of the annular electrode alone is higher than a resonant frequency of the resonant circuit and lower than a resonant frequency of the radiation plate alone.

6. The radio frequency IC device according to claim 1, wherein a frequency of a signal transmitted and received by the radiation plate in a state in which the annular electrode and the radiation plate are coupled to each other is higher than a resonant frequency of the annular electrode and lower than a resonant frequency of the radiation plate.

7. The radio frequency IC device according to claim 1, wherein the annular electrode and the radiation plate are arranged such that a magnetic field generated around the annular electrode is perpendicular or substantially perpendicular to an electric field generated around the radiation plate.

8. The radio frequency IC device according to claim 1, wherein the annular electrode is electrically connected to the radiation plate.

9. The radio frequency IC device according to claim 1, wherein a portion of the annular electrode is arranged in close proximity to the radiation plate.

10. The radio frequency IC device according to claim 1, wherein the annular electrode and the radiation plate are located on the same base.

11. The radio frequency IC device according to claim 1, wherein the radiation plate includes wide portions at both ends thereof, the wide portions being wider than a line width of a center portion in a longitudinal direction of the radiation plate.

12. The radio frequency IC device according to claim 11, wherein each of the wide portions includes an empty space.

13. The radio frequency IC device according to claim 1, wherein the pair of end portions of the annular electrode is arranged at an inside of the annular electrode.

14. The radio frequency IC device according to claim 1, wherein a frequency of a signal transmitted and received by the radiation plate is substantially determined by a resonant frequency of the resonant circuit.

32. A radio communication system comprising a radio frequency IC device according to claim 1, and a reader/writer configured to communicate with the radio frequency IC device, wherein the reader/writer includes a magnetic-field radiation plate including an annular electrode.

2. 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.

3. 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.

4. The radio frequency IC device according to claim 3, wherein the feed circuit is located on the feed circuit board and the radio IC and the feed circuit board constitute an electromagnetic coupling module.

15. The radio frequency IC device according to claim 4, wherein the feed circuit board is a ceramic or resin multilayer board.

16. 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; and

an electric-field radiation plate coupled to the magnetic-field radiation plate.

20. The radio frequency IC device according to claim 16, wherein the magnetic-field radiation plate includes an annular electrode, and the electric-field radiation plate includes a dipole radiation plate.

21. The radio frequency IC device according to claim 16, wherein a resonant frequency of the magnetic-field radiation plate alone is higher than a resonant frequency of the resonant circuit and lower than a resonant frequency of the electric-field radiation plate alone.

22. The radio frequency IC device according to claim 16, wherein a frequency of a signal transmitted and received by the electric-field radiation plate in a state where the magnetic-field radiation plate and the electric-field radiation plate are coupled to each other is higher than a resonant frequency of the magnetic-field radiation plate and lower than a resonant frequency of the electric-field radiation plate.

23. The radio frequency IC device according to claim 16, wherein the magnetic-field radiation plate and the electric-field radiation plate are arranged such that a magnetic field generated around the magnetic-field radiation plate is perpendicular or substantially perpendicular to an electric field generated around the electric-field radiation plate.

24. The radio frequency IC device according to claim 16, wherein the magnetic-field radiation plate is electrically connected to the electric-field radiation plate.

25. The radio frequency IC device according to claim 16, wherein a portion of the magnetic-field radiation plate is arranged in close proximity to the electric-field radiation plate.

26. The radio frequency IC device according to claim 16, wherein the magnetic-field radiation plate and the electric-field radiation plate are located on the same base.

27. The radio frequency IC device according to claim 16, wherein the electric-field radiation plate includes wide portions at both ends thereof, the wide portions being wider than a line width of a center portion in a longitudinal direction of the electric-field radiation plate.

28. The radio frequency IC device according to claim 27, wherein each of the wide portions includes an empty space.

29. The radio frequency IC device according to any one of claim 16, wherein the pair of end portions of the magnetic-field radiation plate is arranged at an inside of the magnetic-field radiation plate.

30. The radio frequency IC device according to claim 16, wherein a frequency of a signal transmitted and received by the electric-field radiation plate is substantially determined by a resonant frequency of the resonant circuit.

17. 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; and

an electric-field radiation plate coupled to the magnetic-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.

18. 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; and

an electric-field radiation plate coupled to the magnetic-field radiation plate.

19. The radio frequency IC device according to claim 18, wherein the feed circuit is located on the feed circuit board;

and

the radio IC and the feed circuit board constitute an electromagnetic coupling module.

31. The radio frequency IC device according to claim 19, wherein the feed circuit board is a ceramic or resin multilayer board.