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Power supply circuit

A technology of power supply circuit and resonant circuit, which is applied in the direction of circuits, electrical components, electric solid devices, etc., can solve problems such as changes in antenna resonant frequency characteristics, difficulty in installing tiny wireless IC chips 310, etc., and achieve the effect of stable frequency characteristics

Active Publication Date: 2010-12-01
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is extremely difficult to mount the tiny wireless IC chip 310 on the large-area films 300 and 320, and if a positional deviation occurs during mounting, the resonant frequency characteristics of the antenna will change.

Method used

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no. 2 Embodiment

[0092] (Refer to the second embodiment Figure 8 )

[0093] As the wireless IC device 1b of the second embodiment, such as Figure 8 Shown is a device that makes the radiation plate 20 bifurcate by 90°. That is to say, in the x-y plane, the radiation plate 20 is constituted by the radiation part 20a extending in the x-axis direction and the radiation part 20b extending in the y-axis direction, and the extension line of the radiation part 20a is used as the power supply part 20d, and in The power supply circuit board 10 on which the wireless IC chip 5 is mounted is bonded to the power supply portion 20d.

[0094] In addition, the internal structure of the power supply circuit board 10 is the same as that of the first embodiment, and the effect of the second embodiment is the same as that of the first embodiment. Furthermore, since the radiation parts 20a and 20b extend in the x-axis direction and the y-axis direction, circularly polarized waves can be received, thereby impro...

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Abstract

The invention provides a power supply circuit which can be mounted on a wireless IC device or the like, has stable frequency characteristics and can achieve a wide frequency band. The power supply circuit 16 is connected with a wireless IC chip 5 and includes a resonant circuit having a predetermined resonance frequency. A radiation plate 20 radiates a transmission signal supplied from the power supply circuit 16 and receives a reception signal to supply it to the power supply circuit 16. The power supply circuit 16 includes inductance elements L1, L2 formed in a coil-shaped electrode pattern and the inductance elements L1, L2 are electrically connected in parallel with each other and magnetically coupled with each other.

Description

[0001] This application is a divisional case of the invention patent application with the application date of January 12, 2007, the application number "200780001074.5 (PCT / JP2007 / 050308)", and the invention title "wireless IC device and parts for wireless IC device" Application. [0002] technology area [0003] The present invention relates to a power supply circuit, in particular to a power supply circuit that can be suitably mounted on a wireless IC device used in an RFID (Radio Frequency Identification, radio frequency identification) system. Background technique [0004] In recent years, as a management system for articles, a reader-writer that generates an induced electromagnetic field and an IC tag (hereinafter referred to as a wireless IC device) attached to an article and storing specified information have been researched to communicate in a non-contact manner, thereby RFID system for information transfer. As a wireless IC device used in an RFID system, for example,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/00H01Q1/24G06K19/077G06K19/07H01P5/08H01Q1/38H01Q1/50H04B5/48
CPCH01Q9/16H01Q1/2208H04B5/0056H01Q1/2225G06K19/07749H01Q1/38G06K19/07756H04B5/0012H04B5/22H04B5/77H01L2224/16225Y02D30/70G06K19/07H01Q1/46G06K19/077H01Q1/24
Inventor 道海雄也加藤登石野聪
Owner MURATA MFG CO LTD
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