Rfid tag

A technology of RFID tags and antennas, applied in the field of RFID tags, can solve problems such as reducing communication distance and achieve the effect of reducing the amount of variation
CN101286206AInactive Publication Date: 2008-10-15HITACHI LTD
1 Cites 24 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI LTD
Publication Date
2008-10-15
Estimated Expiration
Not applicable ยท inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

An RFID tag (5, 9) according to the present invention includes a first antenna (11, 21) on which an IC chip (3) is mounted and a second antenna (12, 22) extending from an end of the first antenna (11, 21) in a direction at right angles to the first antenna (11, 21). The first antenna (11, 21) has an arbitrarily electrical length and the second antenna (12, 22) has an electrical length of / 2 or an integral multiple of / 2. A resin base film (2) having a thickness of approximately 50 [mu]m is disposed on the back side of the first antenna (11, 21) and the second antenna (12, 22). With this configuration of a tag antenna (4), the second antenna (12, 22) resonates with the first antenna (11, 21) to exhibit a radio wave amplifying effect.; Therefore, a long communication distance can be achieved even if the electrical length of the first antenna (11, 21) is chosen to be short or the thickness of the base film (2) is chosen to be thin.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to an RFID (Radio Frequency Identification) tag that transmits information such as ID (Identification: identification information) stored in an IC chip or the like by RF (Radio Frequency: radio frequency). Background technique

[0002] An RFID tag consists of an IC chip and a tag antenna, and information such as ID stored in the IC tag can be transmitted wirelessly (RF) from the tag antenna. Therefore, if the reader / writer wears the RFID tag, the reader / writer can read the information stored in the IC chip at a relatively long communication distance (for example, 140 mm, etc.) without contact. Therefore, RFID tags are often used for production management or logistics management of articles assembled in factories or the like. However, when the RFID tag is directly installed on the surface of the metal material, the communication distance is significantly reduced. Therefore, in order to solve such a problem, for example, w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More