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Radio communication device

A technology of a wireless communication device and a communication circuit is applied in the field of RFID tags to achieve the effect of realizing broadband

Inactive Publication Date: 2011-09-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention was made to solve the above-mentioned problems, and its object is to obtain an RFID tag that widens the operating frequency of the antenna used in the RFID tag and can be used in common regardless of the region, and obtains A wireless communication device that can achieve matching to any load impedance and can widen the operating frequency band even when the input impedance of the IC chip cannot be freely selected

Method used

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Examples

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Embodiment 1

[0036] figure 1 These are a plan view and a cross-sectional view showing the wireless communication device of the first embodiment of the present invention, and show the structure of an RFID tag that functions as a wireless communication device.

[0037] figure 1 (A) is a top view, figure 1 (B) is along figure 1 The cross-sectional view of the G-G' line in (a).

[0038] in figure 1 Here, the RFID tag includes a ground conductor 1, a radiation conductor (hereinafter referred to as “conductor”) 2, a slot line (hereinafter referred to as “slot”) 3, capacitive coupling units 4a, 4b, and an IC chip 5.

[0039] The ground conductor 1 is a conductor composed of a finite size, such as figure 1 (A) shows a rectangular shape. The conductor 2 is a plate-shaped conductor, and has a rectangular shape, for example, like the ground conductor 1.

[0040] The conductor 2 is arranged substantially parallel to the ground conductor 1 with an interval therebetween, and forms a microstrip antenna together ...

Embodiment 2

[0109] In addition, in the example 1 ( figure 1 ), let the shape of the slot 3 of the conductor 2 be arbitrary, but as Picture 12 As shown, by using the slot 3A of the designed shape, the coupling degree of the microstrip antenna composed of the ground conductor 1 and the conductor 2 and the slot 3A can be adjusted, and the degree of freedom of design can be improved.

[0110] Picture 12 It is a plan view showing the RFID tag constituting the wireless communication device of the second embodiment of the present invention. For the same configuration as described above, the same reference numerals as described above are attached, and detailed descriptions are omitted.

[0111] in Picture 12 In the above-mentioned embodiment 1, the difference from the above-mentioned embodiment 1 is that a folded back slot portion is formed in two places (at least one place) of the slot 3A to generate an internal magnetic field with respect to the microstrip antenna composed of the ground conductor 1...

Embodiment 3

[0128] In addition, in the examples 1, 2 ( figure 1 , Picture 12 In ), for the slot 3 of the conductor 2, capacitive coupling units 4a, 4b are formed by a laminated structure, but it can also be as Figure 15 In that way, the capacitive coupling units 4a, 4b are formed on the same plane as the slot 3B.

[0129] Figure 15 It is a plan view showing the RFID tag constituting the wireless communication device of the third embodiment of the present invention. figure 1 ) For the same parts, the same symbols as those described above are attached, and detailed descriptions are omitted.

[0130] in Figure 15 Among them, the difference from the first and second embodiments is that the capacitive coupling units 4A and 4B are arranged on the same plane as the slot 3B.

[0131] In this case, the capacitive coupling units 4A and 4B are each composed of a third conductor, the capacitive coupling unit 4A is arranged close to one side of the slot 3B, and the capacitive coupling unit 4B is arranged ...

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PUM

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Abstract

Provided is a radio communication device which can achieve matching to an arbitrary load impedance and widen the operating frequency band even if the input impedance of an IC chip cannot be freely selected. The radio communication device is provided with a first conductor (ground conductor (1)), a second conductor (2) disposed nearly parallel to the first conductor (1), a hole (slot (3)) formed in the second conductor (2), capacitive coupling means (4a, 4b) disposed near the hole, and a communication circuit (IC chip (5)) having at least one of a radio wave transmitting function or receiving function. The communication circuit is connected between two portions on the second conductor (2) near a boundary line between the conductor and the hole by means of the capacitive coupling means (4a, 4b).

Description

Technical field [0001] The present invention relates to a wireless communication device, and more specifically, to an RFID (Radio Frequency IDentification: individual identification using radio waves) tag that uses an electromagnetic field. Background technique [0002] In the past, RFID systems using UHF bands have longer communication distances than inductive electromagnetic (or "inductive electromagnetic field") RFID systems using HF bands, so they are mainly used in the field of logistics. Therefore, RFID tags are sometimes used by being attached to metal objects (conductive objects). [0003] At this time, in the conventional RFID tag using a dipole antenna, when it is attached to a metal object or installed near a metal object, there are the following problems: the antenna does not operate due to the influence of the metal object, or the communication distance significantly reduce. Therefore, it is required to realize an RFID tag that can suppress performance degradation ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38G06K19/07H04B5/02H01Q13/10G06K19/077H04B5/48H01Q5/335H01Q5/378
CPCH01Q9/0407H01Q9/0457H04B5/0012H01Q23/00H01Q1/2225G06K19/07786H01Q5/0041G06K19/07771H01Q5/0062H01Q5/335H01Q5/378H04B5/22
Inventor 柳崇西冈泰弘深泽徹宫下裕章水野友宏佐佐木拓郎桶川弘胜
Owner MITSUBISHI ELECTRIC CORP
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