| Radio frequency identification technology is a non-contact automatic identification technology that plays an important role in the field of wireless communication as well as the "Internet of things". 2.45 GHz RFID technology is in the initial stage now both in foreign and domestic area and is very lacking in various fields and applications.Compared with the traditional bar code, magnetic card and IC card, RFID is non-contact, fast reading, no wear and is not affected by environment and has a long service life and so on. Design and implementation of a new microwave reader-writer based on ISO18000-4 standard under this mature RFID technology. The main work of this paper include, design of power part, RF, power amplifier, communication with computer, antenna and the software on this microwave reader-writer and tags. Finally test all design. and from the result, we can conclude that this design conforms to the original request.In addition, The design of microwave reader-writer is finished by the combination of software and hardware design, which effectively solved the following key problems:1. The anti-collision. Anti-collision is a significant problem in the communication between reader-writer and tags, which determines the identification speed and efficiency. Based on the analysis of several commonly used anti-collision algorithm, I put forward a way to solve the conflict between tags using binary search algorithm which based on ISO18000-4 standard in the software part.2. Recognition distance. Combination with power amplifier, PCB and monopole antenna to meet the requirements of recogniton distance under different surroundings.The design of microwave reader-writer is applicable to all kinds of life, just as: The supermarket warehouse management, the school vehicle access gate management an so on, Which Has small volume, light weight, easy to carry, and provides a high reference value in design and implementation of other reader-writer. |
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