RFID tag device

一种电子标签、器件的技术，应用在无线射频识别电子标签器件领域，能够解决输出电压低、发射输出(转换效率低、接收功率损失等问题

Inactive Publication Date: 2007-04-04
INTELLIGENT UNIVERSE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) A response signal is generated by orderly changing the impedance ZV between the antenna feed point and GND, and the incident electromagnetic wave is repeatedly reflected and absorbed, so that the emission output (conversion efficiency) is low, and the load impedance ZV is applied to between the feed point and GND, resulting in a large loss of received power
[0009] (2) The power supply voltage generated by rectifying the radio frequency signal received by the antenna feed point directly with a diode is used as the power supply voltage of the control circuit, so the output voltage is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0089] Fig. 3 shows the basic structure of the RFID electronic tag of the present invention. In this figure, the antenna of the RFID electronic tag device is composed of a bottom plate conductor, an insulating layer and a two-part strip conductor. The RFID electronic tag device shown in this figure uses the 2.45GHz frequency band, and all specific dimensions are in mm. In addition, the split point in the two-split strip conductor deviates a little from the equal split point in the longitudinal direction. According to the effect presented by this feature, the signal receiving efficiency of the antenna can be maximized.

[0090] FIG. 4 shows the contents of the control circuit chip shown in FIG. 3 and the state in which the two-divided strip conductor and the control circuit are connected.

[0091] In Figure 4, six points A, B, C, D, E, and F are connected between the control circuit chip and the antenna. The PIN diodes D7 and D8 used for impedance modulation are connected bet...

Embodiment approach 2

[0108] (Positioning method for moving objects without RFID electronic tags)

[0109] The RFID electronic tag of the present invention has the characteristics of having no power supply and being capable of long-distance communication, and this characteristic is utilized here.

[0110] As shown in Figure 6, on the premise that the positions of electronic tags #1 and #4 and interrogators #1 and #2 are known, the position of the mobile body can be estimated according to the information of the path blocked by the mobile body.

[0111] In this case, it is also possible to time divide the CW output from the interrogator into fm1=fm2, fs1=fs2=fs3=fs4, and make the response from the electronic tag an anti-collision system.

[0112] Furthermore, it is also possible to make the CW output from the interrogator continuously output as fm1≠fm2, fs1=fs2=fs3=fs4, and make the response from the electronic tag an anti-collision system.

[0113] Furthermore, it is also possible to make a system ...

Embodiment approach 3

[0115] (Positioning method for mobile objects equipped with RFID)

[0116] The RFID electronic tag of the present invention has the characteristics of having no power supply and being capable of long-distance communication, and this characteristic is utilized here.

[0117] As shown in Figures 22 and 23, multiple receiving antennas are used on the host, and transmit cw signals equal to or greater than two frequencies, and then detect the phase difference of the response signal from the RFID electronic tag to estimate the three-dimensionality of the RFID electronic tag Location.

[0118] The host structure is revealed in Figure 7. The Fourier transform unit performs time-series Fourier integration on the data of Re and Im of antenna #1 and even antenna #4, and calculates the frequency spectrum phase of frequency Δ. At this time, the phase difference caused by the switching time difference between each antenna cable and the down converter and the selection SW is corrected and ...

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Abstract

The present invention aims to overcome the drawback with conventional RFID tag devices having a short communication range, and expand the communication range to several times or more that in the conventional scheme. The conventional scheme is based on equilibrium feeding / equilibrium modulation (a two-terminal circuit for antenna operation), whereas the present invention is based on disequilibrium feeding / equilibrium modulation (a three-terminal circuit for antenna operation). The conventional scheme is based on simple rectification of received RF signals, whereas the present invention employs a circuit based on a combination of a stub resonance-based, impedance transformation boosting scheme and a ladder boosting scheme. The conventional scheme is based on ASK or BPSK modulation, whereas the present invention is based on passive modulation, but can employ a QPSK modulation circuit.

Description

technical field [0001] The present invention relates to a radio frequency identification (hereinafter referred to as RFID) electronic tag device. More specifically, it relates to an RFID based on passive modulation, but can use loop antennas and dipole antennas for wireless communication such as QPSK modulation. electronic label device. Background technique [0002] Patent Document 1: Japanese Patent Laid-Open No. H10-224262. [0003] (Electronic tags for radio frequency identification communication systems) [0004] RFID is a wireless device that identifies moving objects. It is attached or fixed to objects, people, cars or road signs, etc., in response to electromagnetic waves from interrogators (readers), so that interrogators can obtain individual information and location information. . [0005] In addition to replacing barcodes, this radio frequency identification technology is also expected to become a core technology that can realize a new and future network societ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/59H04B5/02H02J17/00H01Q13/08H01Q9/16G06K19/07G06K19/077H01Q1/22H01Q1/24H01Q1/38H01Q9/06H01Q23/00
CPCH01Q1/2208G06K19/07749G01S13/765H04B1/59G06K19/07786G01S7/023H01Q9/16G01S13/751G06K19/0723G01S13/79H01Q1/248H01Q9/065H01Q1/38H02J17/00H01Q23/00H02J50/20H02J50/005H02J50/90H02J50/27H02J50/40H02J50/60
Inventor 北吉均泽谷邦男
Owner INTELLIGENT UNIVERSE RES INST
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