Wireless IC device, wireless IC module and method of manufacturing wireless IC module

• US 8,544,759 B2
• Filed: 11/29/2012
• Issued: 10/01/2013
• Est. Priority Date: 01/09/2009
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kato, Noboru
• Primary Examiner(s): VO, TUYEN KIM
• Application Number:
  US13/688,287
• Publication Number:
  US 20130087625A1
• Time in Patent Office: 306 Days
• Field of Search: 235/451, 235/492, 340/10.1, 340/572.1, 340/572.2, 340/572.7, 340/10.2, 343/700.R
• 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: G06K 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
• CPC Class Codes: G06K 19/07775 the antenna being on-chip
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• 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 1/2283 mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

A wireless IC module that can function as a component of an RFID system even when mounted on a metal article includes a loop-shaped electrode that is constructed such that a plane of a loop of the loop-shaped electrode is substantially perpendicular to the mounting surface of a wireless IC module. The loop-shaped electrode functions as a magnetic field antenna and is electromagnetically coupled with a metal article so that the surface of the metal article functions as a radiator antenna.

Claims

1. A wireless IC device comprising:

a wireless IC that processes radio signals;

a radiation electrode that defines a radiating member; and

a loop-shaped electrode connected to the wireless IC device;

wherein the radiation electrode includes a cylindrical metal article;

the loop-shaped electrode is arranged inside of the cylindrical metal article so as to cut across an inner space of the cylindrical metal article; and

the loop-shaped electrode and the cylindrical metal article are electromagnetically coupled to each other or directly electrically connected to each other.

2. The wireless IC device according to claim 1, wherein the loop-shaped electrode includes two portions which face each other, and the loop-shaped electrode is connected or coupled to the inner surface of the cylindrical metal article via the portions.

3. The wireless IC device according to claim 1, wherein the loop-shaped electrode is electromagnetically coupled to the inner surface of the cylindrical metal article.

4. The wireless IC device according to claim 1, wherein the loop-shaped electrode is conductively connected to the inner surface of the cylindrical metal article.