UHF RFID antenna in RFID system: From the principle of RFID technology, the key to the performance of RFID tags lies in the characteristics and performance of UHF RFID antenna. In tag and reader data. The key role in the communication process is the UHF RFID antenna. On the one hand, the chip start circuit of the tag starts to work and needs to be generated by the UHF RFID antenna in the reader. Sufficient energy is obtained in the electromagnetic field; on the other hand, the antenna determines the communication channel and communication mode between the tag and the reader. Therefore, the research on antennas, especially the internal antennas of tags, has become the focus.
UHF RFID antenna category: According to the power supply mode of the RFID tag chip, the UHF RFID antenna can be divided into two types: an active antenna and a passive antenna. Active UHF RFID antenna performance requires lower passive antennas, but its performance is greatly affected by battery life: passive antennas can overcome active antennas by battery limits. The system is insufficient, but the performance of the antenna is very high. At present, the research focus of UHF RFID antenna is passive antennas. Working frequency from RFID system. Segmentation, in the LF, HF segment f such as 6.78MHz, 13.56MHz) I for the RFID system, the electromagnetic energy is transmitted in the induction field area (stable Completed in the field, also known as inductive coupling system; in the UHF segment (such as 915MHz, 2400Mttz) Z system, the electromagnetic energy transmission is far Completed in the field area (radiation field), also known as the microwave radiation system. Because the energy generation and transmission methods of the two systems are different, the corresponding The UHF RFID antenna and the front end portion have their own particularities, so the UHF RFID antenna is divided into a near field induction coil antenna and a far field radiation antenna. Sense the coupling system uses a near-field induction coil antenna composed of a multi-turn inductor coil, and the inductor coil and the capacitor connected in parallel with it. The resonant circuit is coupled to maximize the RF energy; the types of far-field radiating antennas used in the microwave radiating system are mainly dipole antennas and gaps. Antennas, far-field radiating antennas are usually resonant, typically taking half a wavelength. The shape and size of the antenna determine the range of frequencies it can capture, etc. Performance, the higher the frequency, and the more sensitive the antenna and the smaller the area occupied. Higher operating frequencies can have smaller label sizes, with near field. Compared to the inductive antenna, the far field radiating antenna has a higher radiation efficiency.
HY-RU5205 is a new module of circular polarization antenna from RFIDHY, it weight 0.4kg, with a size 320*320*5mm. It is an idea UHF RFID antenna for UHF RFID readers for its wide and stable reading range.
