Rfid antenna types are a device that receives or radiates the front-end RF signal power in the form of electromagnetic waves. It is an interface device between circuit and space, which is used to realize the transformation of guided traveling wave and free space wave energy. in rfid antenna types system, the antenna is divided into two categories: electronic rfid tag antenna and reader antenna, which are responsible for receiving energy and transmitting energy respectively. The current rfid antenna types system is mainly focused on the LF, HF, UHF and microwave bands. The principle and design of rfid antenna types system with different operating bands are fundamentally different. The gain and impedance characteristics of rfid antenna types will affect the action distance of RFID automatic recognition system whose design is related to the success of the whole RFID automatic recognition system.
Rfid antenna types structure and environmental factors have great influence on antenna performance. The rfid antenna types structure determines its pattern, impedance characteristics, standing wave ratio, antenna gain, polarization direction, operating frequency band and other characteristics. The characteristics of rfid antenna types are also affected by the shape and physical characteristics of the attached objects. For example, a magnetic field cannot penetrate through magnetically conductive materials such as metals, and the shape of magnetic lines near metal objects will change. Moreover, because the magnetic field can cause eddy current on the metal surface, it can be known from Lenz's law that eddy current can generate magnetic flux that resists excitation, resulting in great attenuation of magnetic flux on the metal surface. The energy emitted by rfid antenna types is absorbed by metal, and the reading and writing distance will be greatly reduced. In addition, liquid can absorb electromagnetic signals, the elastic base layer can cause deformation of RFID electronic tags and antennas, and broadband signal sources (such as engines, water pumps, generators) can generate electromagnetic interference, etc. These are all areas that we must consider carefully when designing rfid antenna types. At present, the research field has put forward various solutions according to the above characteristics of the antenna, such as using meandering antenna to solve the size limitation, using inverted F rfid antenna types to solve the reflection problem on the metal surface, etc.
At present, rfid antenna types technology has gradually developed into an independent interdisciplinary professional field, which integrates technologies in different professional fields, such as rfid antenna types technology, semiconductor technology, high frequency technology, electromagnetic compatibility, data protection and cryptography, wireless communication technology, packaging and manufacturing technology and other professional fields. rfid antenna types technology has greatly saved labor costs, improved operation accuracy, accelerated data processing speed, and effectively tracked logistics dynamics. rfid antenna types design technology is a key technology in the whole RFID automatic identification system design, which requires us to consider the influence of application environment, working frequency and impedance matching of RFID system more carefully on the basis of common antenna design, so as to provide guarantee for the ideal work of rfid antenna types system.