Miniaturized and circularly-polarized RFID (Radio Frequency Identification) reader-writer antenna

A reader, circular polarization technology, applied in the field of circular polarization RFID reader antenna, miniaturization, can solve the problem of large size, unable to use hand-held RFID reader, without considering the impact of floor antenna performance, etc. problem, to achieve the effect of simple design, small antenna size and low cost

Inactive Publication Date: 2012-12-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patch size of the microstrip antenna is generally one-half of the medium wavelength. For UHF RFID, its size is too large to be applied to handheld RFID readers
Many techniques have been reported to reduce the size of microstrip antennas, such as PIFA antennas, using high dielectric constants, slotting antennas, and loading antennas, etc., but these techniques have not considered the impact of the floor on antenna performance

Method used

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  • Miniaturized and circularly-polarized RFID (Radio Frequency Identification) reader-writer antenna
  • Miniaturized and circularly-polarized RFID (Radio Frequency Identification) reader-writer antenna
  • Miniaturized and circularly-polarized RFID (Radio Frequency Identification) reader-writer antenna

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Embodiment Construction

[0018] Such as figure 1 , figure 2 and image 3 As shown, the present invention is a miniaturized, circularly polarized RFID reader antenna, using a microstrip rectangular loop antenna with a side length of about 1 / 4 wavelength. Compared with the traditional microstrip antenna, the size is reduced by half.

[0019] Use a planar miniaturized coupler to achieve circular polarization, and integrate the coupler inside the antenna. Under the premise of not affecting the size of the antenna and being on the same plane as the antenna, the performance of the antenna is basically not affected, and this structure is also easy to process , the cost is lower.

[0020] The role of the circular reflector is to replace the traditional floor to form one-way radiation. By changing the length and bandwidth of the loop reflector, it is used to adjust the front-to-back ratio and gain of the antenna.

[0021] Changing the distance between the antenna and the reflector can change the performan...

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Abstract

The invention relates to a miniaturized and circularly-polarized RFID (Radio Frequency Identification) reader-writer antenna, comprising a micro-strip rectangular annular antenna (1), a feed matched network (2), a planar miniaturized coupler (3), an input port (4), an isolation port (5), a medium substrate (6), a plastic screw (7) and an annular reflector (8). Compared with the conventional micro-strip antenna, the size of the micro-strip rectangular annular antenna is reduced by a half; the designed antenna is easily matched to 50ohm through a feed coupling manner; the circular polarization is realized by the planar miniaturized coupler; and the planar miniaturized coupler is integrated in the antenna, and thus the size of the antenna is not influenced. The conventional floor is replaced by the annular reflector, so that the antenna forms a unidirectional radiation pattern, and the size of the antenna is greatly reduced and almost the same as that of the reflector. Therefore, the miniaturized and circularly-polarized RFID reader-writer antenna can be applied to a handheld RFID reader-writer and also can be used for miniaturized design of antennas of other frequency ranges.

Description

technical field [0001] The invention relates to a miniaturized, circularly polarized RFID reader-writer antenna, which can be applied to the handheld RFID reader-writer antenna and antenna miniaturization design. Background technique [0002] Microstrip antennas have been widely used in various mobile communication systems due to their low profile, light weight, low cost, and easy conformability. The patch size of the microstrip antenna is generally one-half of the medium wavelength. For UHF RFID, its size is too large to be applied to handheld RFID readers. Many techniques have been reported to reduce the size of microstrip antennas, such as PIFA antennas, using high dielectric constants, slotting antennas, and loading antennas, etc., but these techniques have not considered the impact of the floor on antenna performance. However, the effect of floor size on antenna performance is obvious. If the floor becomes smaller, the rear lobe of the antenna will increase, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q7/00H01Q13/08H01Q19/10H01Q15/24H01Q1/38
Inventor 杨峰李岩张银余鹏程郭智欧阳骏杨鹏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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