DICOM standards in portable medical devices (1)

1 Introduction

RF (Radio Frequency) specifically refers to a certain wavelength can be used for radio communication electromagnetic wave.

RFID (Radio Frequency Identification) is a 1990 's began to rise in a non-contact automatic identification technology, it is the use of radio frequency signal and spatial coupling (inductance or electromagnetic coupling) or radar reflection of transmission characteristics, realization of objects to be identified automatically recognized. However, at present, RFID development persists more bottlenecks, data read rate is not high is one of the main bottlenecks.

This article will pass on RFID system basic composition and working principle of introducing, on the RFID system for analysis.

Combining RFID system in practical problems encountered in the application and the scope for the reader to read a blind spot, there is a different reading point redundant data, reader interaction and other factors which cause the system to read rate is not high, from optimizing hardware configuration, software design, perfect play middleware and fusion of four other technology to improve RFID system data read rate.

2 the basic composition of the RFID system

RFID system at least by electronic label (E-Tag/Transponder, also called smart tags) and reader (Reader/Interrogator, also called readers) made up of two parts.

Electronic label is radio frequency identification system of data carrier, the electronic label by tag antenna and label chip.

E-tag basis is divided into different power supply of the active RFID tag (Active tag), passive RFID tag (Passive tag) and half a passive RFID tag (Semi — passive tag); based on the frequency of low frequency RFID tag is divided into different, high frequency RFID, UHF RFID tag and microwave electronics labels; based on the package is divided into different forms of * label, line labels, paper-like label, glass tube labels, round labels and special-purpose shaped labels; according to its mode of operation is divided into passive and active tags.

Reader is for reading or writing the electronic label information device, depending on the usage environment and requirements can be designed for a wide range of products.

Readers through the antenna and the electronic label for wireless communication, you can enable label identification number and memory data read or write operations.

A typical Reader contains high frequency module (transmitter and receiver), the control unit and reader antenna.

Of course, RFID system in practical application, you also need a computer and other hardware devices and software support. Figure 1 a typical RFID system diagram.

3 the basic model of the RFID system

RFID system's basic model as shown in Figure 2.

As RF carrier RFID tag and reader implementation by coupling components between RF signals in space (no contact) coupling, coupling channel, according to the sequential relationships to achieve energy delivery, data exchange.