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Radio communication system

A wireless communication system and antenna technology, applied in transmission systems, near-field transmission systems using transceivers, electromagnetic radiation induction, etc. Radio wave interference, the effect of improving processing power

Inactive Publication Date: 2005-07-13
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the RFID system 1, it is difficult to irradiate the signal transmitted from the interrogator antenna 3 to the desired range as described above. The interrogation signal of the wireless tag 4 increases and produces diffuse
In addition, it is said that there is also the following problem: that is, the interrogation signal diffused to a long distance becomes an interference wave to other RFID systems and wireless communication systems such as wireless LAN (Local Area Network: LAN) and has adverse effects.
[0014] The technology shown in the above-mentioned Japanese Patent Laid-Open No. 1-300515 relates to an optical CVD device and cannot be directly applied to a wireless communication system

Method used

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Embodiment Construction

[0214] Hereinafter, preferred embodiments of the wireless communication system of the present invention will be described with reference to the drawings.

[0215] A wireless communication system, which is a wireless communication device of the present invention, is configured to include an interrogator, an interrogator antenna connected to the interrogator, and a transponder. The interrogator generates an interrogation to the transponder, and the interrogator antenna transmits an interrogation signal, which is a signal indicating the interrogation, as radio waves. The responder receives the inquiry signal and performs response processing to the inquiry. For example, an answer to an inquiry is generated based on the information stored in itself, and a signal indicating the answer, that is, a response signal is reflected and transmitted as a radio wave. The reply signal sent by reflection from the transponder is received by the interrogator antenna, providing the reply to the i...

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Abstract

The RFID system 10 has an interrogator 11, an interrogator antenna 12 connected to the interrogator 11 to transmit a signal, and a radio wave reflection sheet 21 that reflects a signal transmitted from the interrogator antenna 12 and includes a part of a parabolic curve or a curve similar thereto. , The wireless tag 13 that communicates with the interrogator 11 by receiving and responding to a signal from the interrogator antenna 12 at least through the radio wave reflecting sheet 21 . The signal passing through without being irradiated to the wireless tag 13 is reflected by the radio wave reflection sheet 21 toward the inside of the radio wave reflection sheet 21 . Therefore, signal dispersion can be prevented, and the signal from the interrogator antenna 12 can be effectively used.

Description

technical field [0001] The present invention relates to a wireless communication system for communication between an interrogator and a transponder. [0002] In the present invention, "the vicinity of the focal point" includes the focal point, the "reflecting sheet" includes reflectors of shapes other than sheet-like, and the "near the center point" includes the center point. In addition, in the present invention, "rotation" includes angular displacement of 0 degrees or more (including 0 degrees) and 360 degrees or less, "substantially central part" includes central part, and "substantially U-shaped" includes U-shaped. Background technique [0003] In one wireless communication system, there is a mobile identification (hereinafter referred to as RFID) system. The conventional RFID system is a system with read / write functions, and is equipped with an interrogator and a transponder. Transponders, known as wireless tags, store information, or transmit stored information, as d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00G06K7/08G06K7/10G06K19/07G06K19/077
CPCG06K7/0008G06K7/10178G06K7/10336G06K7/10346G06K19/0723G06K19/07749H04B1/59H04B5/48
Inventor 太田智三中野洋猪崎彻
Owner SHARP KK
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