Small-scale ultrahigh frequency RFID anti-metal tag antenna and impedance separation matching method
An anti-metal tag and ultra-high frequency technology, applied in the field of radio frequency identification, can solve the problems of large antenna volume, narrow bandwidth, and unsuitable for logistics applications, and achieve the effects of increasing actual gain, reducing size, and reducing antenna gain attenuation
Inactive Publication Date: 2013-10-09
SUN YAT SEN UNIV
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Problems solved by technology
In order to effectively improve the tag antenna gain, an antenna with an inverted F structure is usually used as an anti-metal
Method used
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Embodiment 1
[0040] This example aims to design an anti-metal tag that covers the entire frequency band of UHF RFID in China and has a reading distance greater than 2m through the impedance separation and matching method of the antenna structure proposed by the present invention. The tag chip adopts the G2 chip of NXP Company, the typical reading sensitivity is -15dBm, and the corresponding input impedance of the tag chip at 890MHz is 14-j126Ω. Both substrates are made of FR4 material with a relative dielectric constant of 4.4, a loss tangent of 0.01, and a thickness of 1.6mm. The total size of the label is 28mm(L)×14mm(W)×3.2mm(h1+h2).
[0041] This example completes the antenna design and the simulation verification of the impedance separation and matching method based on the finite element method. In view of the fact that the invention is mainly used in metal environments, this example expands the floor size to 200mm×200mm during the optimization process to simulate labels directly attac...
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The invention discloses a small-scale ultrahigh frequency RFID anti-metal tag antenna and an impedance separation matching method. The small-scale ultrahigh frequency RFID anti-metal tag antenna comprises a top irradiator, a middle irradiator, a bottom irradiator, an upper substrate and a lower substrate, wherein the upper substrate and the lower substrate are connected in a stacking mode. The upper surface of the upper substrate is coated with the top irradiator, the lower surface of the upper substrate is coated with the middle irradiator, and the lower surface of the lower substrate is coated with the bottom irradiator. The top irradiator comprises two top irradiating areas which are mutually independent. A plurality of top narrow grooves are formed in each irradiating area. A plurality of middle narrow grooves are formed in the middle irradiator. A plurality of upper through holes are formed in the upper substrate in the longitudinal direction. A plurality of lower through holes are formed in the lower substrate in the longitudinal direction. The inner wall of each upper through hole and the inner wall of each lower through hole are respectively coated with connection portions. The top irradiator and the bottom irradiator are communicated through the connection portions of the inner walls of the upper through holes and the inner walls of the lower through holes, and the middle irradiator and the bottom irradiator are communicated through the connection portions on the inner wall of another lower through hole.
Description
technical field [0001] The invention belongs to the field of radio frequency identification, and specifically relates to a small UHF RFID anti-microbial device that can quickly and effectively realize the conjugate matching of the impedance of the antenna and the chip, thereby improving the actual gain of the tag antenna and maximizing the working distance of the tag. Metal tag antenna and impedance separation matching method. Background technique [0002] Radio frequency identification is a wireless communication technology, which completes information collection through mutual induction between tags and readers. Compared with traditional barcodes and two-dimensional codes, radio frequency identification technology has the advantages of long recognition distance and modifiable content, especially After integrating with the Internet of Things, radio frequency identification technology is playing an increasingly important role in the fields of logistics supply chain, food and...
Claims
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Login to View More IPC IPC(8): H01Q1/38H01Q1/22
Inventor 张俊龙云亮
Owner SUN YAT SEN UNIV