Wireless IC device

• US 8,360,324 B2
• Filed: 08/31/2009
• Issued: 01/29/2013
• Est. Priority Date: 04/09/2007
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kato, Noboru, Dokai, Yuya, Shioya, Shigeyuki
• Primary Examiner(s): Lee, Michael G
• Assistant Examiner(s): GUDORF, LAURA A
• Application Number:
  US12/551,037
• Publication Number:
  US 20090302121A1
• Time in Patent Office: 1,247 Days
• Field of Search: 235/492, 343/895, 343/700.R, 343/796, 3405721-5728
• US Class Current: 235/492
• 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: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• 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 1/2225 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 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 9/27 Spiral antennas
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

A wireless IC device that is operable in a wide band and is suitable for RFID systems includes a radiating plate and an electromagnetically coupled module constituted by a wireless IC that processes transmitted/received signals and a feeding circuit board having a feeding circuit and coupled with the wireless IC. The radiating plate includes a linear electrode bent at a bent portion and apparently sectioned into two linear electrode portions having different lengths. The electromagnetically coupled module is arranged such that the feeding circuit board and the linear electrode portions are electromagnetically coupled. The wireless IC is operated by signals received by the radiating plate, and response signals from the wireless IC are radiated outward from the radiating plate.

Claims

1. A wireless IC device comprising:

a wireless IC arranged to process transmitted/received signals;

a feeder circuit connected to the wireless IC and including an inductance element;

a radiating plate coupled to the feeder circuit;

wherein

the radiating plate includes a linear electrode that is bent at a predetermined position so as to be sectioned into two linear electrode portions;

the two linear electrode portions have different resonant frequencies, and at least one portion of each of the two linear electrode portions extend side by side with one another; and

the inductance element and each of the two linear electrode portions of the radiating plate are electromagnetically coupled to one another.

2. The wireless IC device according to claim 1, further comprising a feeder circuit board including the feeder circuit, wherein the feeding circuit board includes a multilayer substrate.

3. The wireless IC device according to claim 1, wherein the radiating plate is provided on a flexible substrate.