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Ultrahigh frequency RFID planar near-field antenna with stable coverage

A near-field antenna and ultra-high frequency technology, which is applied in the direction of antenna, antenna grounding device, antenna grounding switch structure connection, etc., can solve the problems of many reading blind spots, poor edge control, and blind spots, and achieve the elimination of reading blind spots, Effect of uniform field distribution, steep edge attenuation

Active Publication Date: 2021-09-24
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the antenna design is unreasonable, the edge induction field is not suppressed enough, and non-target tags outside the antenna aperture are also read, which will cause cross-reading.
In addition, if the field strength distribution is uneven within the specified aperture range of the antenna, blind spots will appear, resulting in missed reading of tags
Most of the near-field antennas on the market have the problem of poor edge control or many reading blind spots. It is rare to see a low-cost near-field antenna that can solve these two problems at the same time.
In addition, most of the microstrip near-field antennas on the market are based on a multi-layer PCB structure, and the antenna radiation structure and feed network are distributed on different layers. Although this reduces the difficulty of design, it greatly increases the cost of the antenna.

Method used

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  • Ultrahigh frequency RFID planar near-field antenna with stable coverage
  • Ultrahigh frequency RFID planar near-field antenna with stable coverage
  • Ultrahigh frequency RFID planar near-field antenna with stable coverage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 , figure 2 as well as image 3 , a UHF RFID planar near-field antenna with stable coverage, comprising a metal floor 1, a dielectric plate 2 and a radiation layer 3 stacked in sequence; the radiation layer 3 is composed of a power dividing network and N radiators; the power The sub-network is located in the middle of the radiation layer 3, and the radiator is evenly distributed around the power sub-network; the radiator includes a radiator, a first jumper 11, a second jumper group, and an absorption branch assembly; The radiator is located in the middle of the radiator, and the absorption stub assembly surrounds the radiator; the power division network includes a first microstrip group, and the first microstrip 31 in the first microstrip group The number matches the number of the radiator; the radiator is composed of a main microstrip 30; one end of the first microstrip 31 is connected to one end of the main microstrip 30, and the connecting point is a f...

Embodiment 2

[0038] On the basis of the above structure, N is 4, that is, four radiators are provided; the four first microstrips 31 are all parallel to each other; the ends of the two first microstrips 31 away from the first point 41 are connected At a second point 42, the ends of the other two first microstrips 31 away from the first point 41 are connected to another second point 42; the power dividing network also includes the second microstrip 32 and two V shaped microstrip 35; one end of the second microstrip 32 is connected to the feed input terminal 13, and the other end is connected to two V-shaped microstrips 35; the second microstrip 32 is connected to the V The connection point of the shaped microstrip 35 is the third point 43; the third point 43 is located at the center of the power distribution network, and the two second points 42 are separated from the two sides of the third point 43; the two V-shaped The microstrip 35 is symmetrical about the center of the third point 43; s...

Embodiment 3

[0041] On the basis of the above structure, along the direction toward the first lumped element 38 , the distance from the arc-shaped microstrip 36 to the first point 41 gradually increases, improving the ability to absorb the steep edge attenuation of the stub components.

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Abstract

The invention provides an ultrahigh frequency RFID planar near-field antenna with stable coverage. The ultrahigh frequency RFID planar near-field antenna comprises a metal floor, a dielectric plate and a radiation layer which are stacked in sequence; the radiation layer is composed of a power division network and 2 to 4 radiators; the power division network is located in the middle of the radiation layer, and the radiators are uniformly distributed around the power division network; each radiator comprises a radiator body, a first jumper, a second jumper group and 3 to 18 groups of absorption branches; each radiator body is located in the middle of the radiator, and the absorbing branches surround the radiator body; the power division network comprises first micro-strips of which the number matches that of the radiators; each radiator body is composed of a main body micro-strip; one end of each first micro-strip is connected with one end of the corresponding main body micro-strip at a first point; each main body micro-strip rotates, bends and extends around the corresponding first point; each absorbing branch comprises an arc-shaped micro-strip and a first lumped element; one end of each arc-shaped micro-strip is grounded through the corresponding first lumped element, and the other end is connected with the corresponding main body micro-strip at the outer edge of the corresponding radiator body; the current direction of each arc-shaped micro-strip is opposite to that of the corresponding main body micro-strip.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to an ultra-high frequency RFID planar near-field antenna with stable coverage. Background technique [0002] Radio Frequency Identification (RFID) technology has developed rapidly and has been widely used in various fields, especially warehouse management, intelligent logistics, unmanned retail, smart home, smart wearable devices and other industries. In the practical application of various industries, the working environment of RFID systems is becoming more and more complex, and the read-write antennas and electronic tags are also becoming more miniaturized, lightweight and ultra-thin. In such an environment, to improve the reading speed and reading accuracy of the system, higher requirements are put forward for the RFID system. Among them, the read-write antenna is an important component that affects the performance of the RFID system. The far and near field distribution of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q1/50H01Q1/48H01Q17/00
CPCH01Q1/38H01Q1/50H01Q1/48H01Q17/008
Inventor 张晓张聪
Owner SHENZHEN UNIV
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