Electric small Yagi RFID antenna based on reconfigurable polarization

Abstract

The invention provides an electrically small yagi RFID antenna based on polarization reconfiguration. The electrically small yagi RFID antenna comprises dielectric substrates, a guide unit, a reflection unit and a reconfigurable excitation unit. The guiding unit is arranged on the first dielectric substrate, the reconfigurable excitation unit is arranged on the second dielectric substrate, and thereflection unit is arranged on the third dielectric substrate. The reconfigurable excitation unit comprises two groups of excitation dipole structures which have the same structure and are orthogonally arranged with each other, and the states of polarization along an x axis, polarization along a y axis, left-handed circular polarization and right-handed circular polarization are switched by respectively controlling the working states of control excitation units in the excitation dipole structures arranged on each part. According to the invention, the polarization reconfigurable function can be realized only by controlling the state of the control excitation unit loaded on the reconfigurable excitation unit without any change of a parasitic unit, and the polarization reconfigurable antennahas the characteristics of high directivity, good end-fire characteristic, miniaturization, compactness, simple structure, low cost and the like.

Description

technical field [0001] The invention relates to the communication field, in particular to a polarization-based reconfigurable electronic Yagi RFID antenna. Background technique [0002] With the rapid development of wireless communication systems, the development of antenna technology is changing with each passing day. Among them, highly directional, reconfigurable polarization antennas can select the appropriate polarization mode according to changes in the real-time environment, and improve the performance by multiplexing the same channel and frequency spectrum. System capacity, avoiding polarization mismatch, and reducing channel interference are therefore important components in wireless communication and radio frequency identification (RFID) systems. [0003] At present, there are few methods to realize the reconfigurable polarization of the electric Yagi antenna. The existing Yagi antenna usually has a relatively complicated feeding structure, which causes the problem ...

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Problems solved by technology

[0003] At present, there are few methods to realize the reconfigurable polarization of electric small Yagi antennas. The existing Yagi antennas usually have a relatively complicated feeding structure, which causes the problem of high loss in the feeding network.

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