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Radio communication device

A wireless communication device and communication function technology, applied to devices, antennas, independent non-interactive antenna combinations, etc. that enable antennas to work in different bands at the same time, can solve the problems that the communication distance is not necessarily sufficient, and it is not easy to achieve a communication distance. , to achieve the effect of ensuring the installation area

Inactive Publication Date: 2012-11-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when considering the use of this tag in the management of vehicle entry and exit, the communication distance is not necessarily sufficient, the communication distance needs to be improved, and there is a problem that it is difficult to achieve a sufficient communication distance in practical use.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] For the wireless communication device of Embodiment 1 of the present invention, refer to Figure 1 to Figure 14 Be explained. figure 1 , figure 2 and image 3 It is a diagram showing the configuration of a wireless communication device according to Embodiment 1 of the present invention. In addition, in the following drawings, the same code|symbol represents the same or corresponding part.

[0072] figure 1 It is a plan view showing the structure of the upper surface of the card-type wireless communication device, figure 2 It is a plan view showing the structure of the lower surface of the card-type wireless communication device, image 3 yes figure 1 and figure 2 The A-A' line profile.

[0073] exist Figure 1 ~ Figure 3 Among them, in the wireless communication device of Embodiment 1 of the present invention, there are provided: a flat object 1 such as a dielectric or a magnetic body; a spiral conductive object 2 having external dimensions L (length) and...

Embodiment 2

[0131] For the wireless communication device of Embodiment 2 of the present invention, refer to Figure 15 to Figure 22 Be explained. Figure 15 and Figure 16 It is a diagram showing the configuration of a wireless communication device according to Embodiment 2 of the present invention.

[0132] In order to improve the communication performance in the second frequency band, basically, it is preferable that the opening area of ​​the helical conductive object 2 is large. On the other hand, in the above-mentioned embodiment 1 ( Figure 1-Figure 2 , Figure 9-Figure 10 , Figure 12-Figure 13 ) in the antenna structure, in order to improve the communication performance in the first frequency band, it is preferable to arrange the conductive object 3 outside the helical conductive object 2 . These constraints are opposing requirements, and it is difficult to achieve both requirements together. That is, in the above-mentioned first embodiment, the opening area of ​​the helical ...

Embodiment 3

[0146] For the wireless communication device of Embodiment 3 of the present invention, refer to Figure 23 to Figure 30 Be explained. Figure 23 and Figure 24 It is a diagram showing the configuration of a wireless communication device according to Embodiment 3 of the present invention.

[0147] In the above-mentioned Embodiment 1 and Embodiment 2, one integrated circuit is required for each frequency band, that is, an integrated circuit 4 having functions required for communication in the first frequency band and an integrated circuit 4 having functions required for communication in the second frequency band. The function of the integrated circuit 5 . In recent years, a multi-frequency shared integrated circuit having both communication functions required for each frequency band has been put into practical use. In this embodiment, an antenna structure corresponding to the above-mentioned multi-frequency shared integrated circuit will be described.

[0148] Figure 23 an...

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PUM

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Abstract

Provided is a radio communication device which communicates corresponding to signals in a first frequency band and a second frequency band having lower frequency than the first frequency band, respectively, and comprises a flat plate object, a first integrated circuit having a communication function in the first frequency band, a first conductive object connected to one of two input / output terminals of the first integrated circuit, a conductive object group composed of a plurality of second conductive objects wherein at least one object is connected to the other input / output terminal of the first integrated circuit, a second integrated circuit having a communication function in the second integrated circuit, and a spiral shaped conductive object wherein a winding start side thereof is connected to one of two input / output terminals of the second integrated circuit, and a winding end side is connected to the other of the two input / output terminals, wherein the conductive object group and the spiral shaped conductive object are formed on opposite surfaces of the flat plate object so that more than half of the spiral shaped conductive object overlaps the conductive object group when they are perspectively viewed from the normal line direction of the flat plate object.

Description

technical field [0001] The present invention relates to a wireless communication device including an antenna structure of a tag used in an RFID (Radio Frequency Identification) system, and in particular to a wireless communication device capable of sharing multiple frequencies. Background technique [0002] In recent years, RFID systems for automatic identification and management of people and objects are rapidly gaining popularity. In the electromagnetic field radiated from the antenna used in the RFID system, there are three fields of a quasi-electrostatic field, an induction field, and a radiation field. Their field strengths are inversely proportional to the third power of the distance from the antenna, the second power of the distance from the antenna, and the first power of the distance from the antenna, respectively. [0003] When classifying the communication methods of RFID systems from this point of view, they can be roughly divided into induction field coupling m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q5/01H01Q21/30G06K19/07G06K19/077H01Q7/00H01Q9/26H01Q5/10H01Q5/40
CPCH01Q21/28H01Q1/2225H01Q7/00G06K19/07767H01Q5/0072H01Q5/40G06K19/077H01Q5/10
Inventor 西冈泰弘深泽彻宫下裕章水野友宏佐佐木拓郎桶川弘胜
Owner MITSUBISHI ELECTRIC CORP