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Circular-polarized electronic label antenna and design method thereof

A technology of electronic tags and circular polarization, which is applied to antenna unit combinations, antennas, loop antennas and other directions with different polarization directions, and can solve problems such as difficulties

Active Publication Date: 2013-03-20
ZTE INTELLIGENT IOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to some characteristics of circular polarization, the size of circularly polarized antennas must be large enough, so it is difficult to design circularly polarized electronic tag antennas that require miniaturization.

Method used

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  • Circular-polarized electronic label antenna and design method thereof
  • Circular-polarized electronic label antenna and design method thereof
  • Circular-polarized electronic label antenna and design method thereof

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Embodiment Construction

[0028] The invention provides a circularly polarized electronic tag antenna and a design method thereof. Firstly, the three basic conditions of the circularly polarized antenna are satisfied, so that the electric field vectors Ex and Ey in the two directions of the circularly polarized wave are: orthogonal in space, equal in amplitude and The phase difference is ±90 degrees; secondly, in order to consider increasing the range of the tag antenna and design the electric field coupling part.

[0029] Among them, the spatial orthogonality is realized by using two oscillators with the same current direction and a spatial angle of 90 degrees, or by using two loop antennas; the adjustment of the phase difference between Ex and Ey is ±90 degrees, and the former is achieved by adjusting the tag chip The position of the vertical electric field is used to adjust the phase of the vertical electric field; the latter is adjusted in two ways: one is adjusted by moving the position of the feed...

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Abstract

The invention relates to a design method of a circular-polarized electronic label antenna, which comprises the following steps: the basic condition of a circular-polarized antenna is satisfied to enable orthogonality and vibrating amplitudes of electric field vector spaces of circular-polarized waves generated by the antenna to be equal, and the phase difference to be positive 90 DEG or negative 90 DEG; and the coupling part of the electric field of the antenna is designed to increase the radiating range of the antenna, two parts which are in equal distance with feeding points and mutual orthogonality are found out on the antenna, and the change of the electric field strengths of the two parts are ensured to be equal. The invention also correspondingly designs a circular-polarized electronic label antenna according to the method. The invention excellently realizes the circular-polarized antenna scheme on the electronic label by smart design, and the antenna has a long radiating range. Because the antenna has no directional limitation on the attached object of the label, the design method of a circular-polarized electronic label antenna is suitable for a linear-polarized reader antenna and a circular-polarized reader antenna.

Description

technical field [0001] The invention relates to radio frequency identification (RFID, Radio Frequency Identification) antenna technology, in particular to a circularly polarized electronic tag antenna for RFID and a design method thereof. Background technique [0002] At present, the electronic tag antennas that appear on the market or are used in system logistics are all linearly polarized antennas, which is very inconvenient in logistics management. If the corresponding reader antenna is a linearly polarized antenna, the range of the tag is longer, so the tagged object cannot be flipped arbitrarily during the inventory or transportation, because the flipping will make the polarization of the tag different from that of the reader. Polarization mismatch makes it impossible to identify the tag, which brings great inconvenience to the application; if the corresponding reader antenna is a circularly polarized antenna, then the polarization mismatch with the linearly polarized t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/00H01Q1/22H01Q21/24H01Q7/00G06K19/077
Inventor 李广立
Owner ZTE INTELLIGENT IOT TECH