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Antenna apparatus

An antenna device and conductive wire technology, which is applied in directions such as antennas, antenna arrays, and antenna parts, etc., can solve the problems of difficulty in providing communication distance, insufficient antenna communication distance, etc.

Inactive Publication Date: 2015-05-20
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the communication distance of conventional antennas is insufficient and it is difficult to generate a uniform electric field over the entire surface of the antenna, especially when the size of the antenna becomes larger
Therefore, it is difficult for conventional antennas to provide a uniform and sufficient communication distance
[0006] Therefore, in the case where a conventional antenna is used in the system as described above, it is difficult to uniformly read all of the RFID tags in the case where a plurality of commodities to which the RFID tags are attached are arranged on a shelf.

Method used

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Experimental program
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Effect test

no. 1 approach

[0040] figure 1 It is an oblique perspective view illustrating the antenna device 100 of the first embodiment. figure 2 It is a figure which exemplified the antenna apparatus 100 of 1st Embodiment in plan view. image 3 It is an enlarged view illustrating a part of the antenna device 100 . Figure 4 is an enlarged view illustrating another part of the antenna device 100 . Figure 5 It is an exploded oblique perspective view illustrating the antenna device 100 . Figure 6 is instantiated figure 1 A diagram of the A-A cross-section of the antenna device 100 illustrated in .

[0041] Hereinafter, the antenna device 100 will be described by using an XYZ coordinate system as an orthogonal coordinate system. Hereinafter, for the purpose of illustration, a surface located in the negative Z-axis direction will be referred to as a bottom surface, and a surface located in the positive Z-axis direction will be referred to as a top surface. However, top and bottom are only provisio...

no. 2 approach

[0122] Figure 9 It is an oblique perspective view illustrating the antenna device 200 of the second embodiment. Figure 10 FIG. 1 is a diagram illustrating an antenna device 200 according to the second embodiment in plan view. In the antenna device 200 according to the second embodiment, configuration elements corresponding to the meander conductive wire 140 and the conductive tape 150 of the antenna device 100 according to the first embodiment are changed.

[0123] Therefore, the same elements as those of the antenna device 100 of the first embodiment or similar elements are denoted by the same reference numerals, and descriptions thereof are omitted. exist Figure 10 In , the main dimensions are illustrated.

[0124] The antenna device 200 includes dielectric layers 110 and 120 , a ground plane 130 , a meandering conductive line 240 and a conductive strip 250 . The antenna device 200 includes eleven conductive strips 250 . In case the eleven conductive strips 250 are d...

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Abstract

An antenna apparatus includes a first dielectric layer having a rectangular shape in plan view, a ground plane configured to be disposed on a first surface of the first dielectric layer, a conductive line configured to have a first end and a second end and to be disposed on a second surface of the first dielectric layer, the first end being a feeding point, the second end being an open end or a short end connected to the ground plane, a second dielectric layer configured to have a shape corresponding to the first dielectric layer and to be disposed on the second surface of the first dielectric layer in a state where the conductive line is sandwitched between the first dielectric layer and the second dielectric layer, the second dielectric layer having a first surface facing toward the first dielectric layer and a second surface opposite to the first surface, a first conductive element configured to be disposed on the second surface of the second dielectric layer so that the first conductive element intersects the conductive line at a first position corresponding to a first node of a standing wave of current flowing through the conductive line in plan view, respectively, and a second conductive element configured to be disposed on the second surface of the second dielectric layer so that the second conductive element intersects the conductive line at a second position corresponding to a second node of the standing wave in plan view, respectively, wherein the first conductive element and the second conductive element are bent or rounded toward the feeding point with respect to the first position and the second position corresponding to the first node and the second node in plan view, respectively, and wherein a first bent degree, a first rounded degree or a first length of the first conductive element is different from a second bent degree, a second rounded degree or a second length of the second conductive element.

Description

technical field [0001] Embodiments disclosed herein relate to antenna arrangements. Background technique [0002] Recently, radio frequency identification (RFID) systems have been widely used. Typically, some RFID systems utilize electromagnetic waves of the UHF band (900 MHz band) or microwave band (2.45 GHz) as a communication medium, and some RFID systems utilize a magnetic field generated by mutual inductance. Among them, an RFID system utilizing electromagnetic waves in the UHF band has attracted attention because the RFID system can provide a relatively long communication distance. [0003] A microstrip antenna has been proposed as an antenna used by a reader-writer that communicates with an RFID tag using electromagnetic waves in the UHF band. A microstrip antenna includes a microstrip line as an antenna (for example, see Patent Reference 1 and Non-Patent References 1 and 2). [0004] There are antennas that are included on the surface of a shelf. Merchandise to w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38
CPCH01Q1/2216H01Q1/38H01Q1/40H01Q13/206H01Q21/0075
Inventor 安德烈·S·安德连科甲斐学
Owner FUJITSU LTD