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Non-diffractive beam direction adjustable reconfigurable Bessel antenna

A beam direction, non-diffractive technology, applied in the direction of antenna, radiating element structure, antenna grounding switch structure connection, etc., can solve the problem of inability to effectively control near-field non-diffractive Bessel beams in real time

Active Publication Date: 2019-08-09
SICHUAN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The present invention proposes a reconfigurable Bessel antenna with adjustable non-diffraction beam direction based on a reconfigurable metasurface, which solves the problem that the near-field non-diffraction Bessel beam direction cannot be effectively regulated in real time in the prior art

Method used

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  • Non-diffractive beam direction adjustable reconfigurable Bessel antenna
  • Non-diffractive beam direction adjustable reconfigurable Bessel antenna
  • Non-diffractive beam direction adjustable reconfigurable Bessel antenna

Examples

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Embodiment 1

[0039] For the TM mode Bessel antenna, the antenna is simulated by using HFSS.

[0040] Set the working frequency to 10GHz; the antenna structure parameters are as follows: the radius is 88.8mm, the height is 1mm; the size of the upper and lower layers of the reconfigurable metasurface structure is 2.32mm, using Rogers 6006 dielectric substrate, the point constant is 6.15, the height is 0.127mm; the Bessel antenna uses coaxial feeding to excite Bessel waves in the radial waveguide, and then when the Bessel waves propagate in the radial waveguide cavity, they leak out to the free space through the reconfigurable metasurface structure, thereby generating Leaky wave.

[0041] The adjustable devices in the reconfigurable metasurface structure use PIN switches, and the PIN switches are covered with the entire reconfigurable metasurface structure, such as image 3 (a) shown. First, the PIN switches are all off and the bias voltage is 0V. At this point, the Bessel antenna produces...

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Abstract

The invention relates to the field of microwave antennas, solves the problem in the prior art that the beseel beam direction cannot be effectively regulated in real time under the fixed microwave frequency, and discloses a non-diffractive beam direction adjustable reconfigurable bessel antenna which comprises a radial waveguide, a coaxial feeder and a reconfigurable impedance surface structure andalso comprises adjustable devices arranged in the reconfigurable impedance surface structure. The reconfigurable impedance surface structure is a periodic patch structure. The reconfigurable impedance surface structure is divided into four reconfiguration quadrants. The adjustable devices are arranged between patch slots on the non-axis in the reconfiguration quadrants. The state of the adjustable device switches of different quadrants of the reconfigurable impedance surface structure is changed by designing the reconfigurable impedance surface structure and setting different bias voltage ofthe reconfiguration quadrants so as to realize real-time deflection of the beam direction. The reconfigurable impedance surface structure is simple and suitable for non-diffractive beam transmission in different directions of the near field so that the antenna can be widely used in wireless energy transmission, near-field detection, medical imaging, secret communication and other fields.

Description

technical field [0001] The invention relates to the field of microwave antennas, in particular to a reconfigurable Bessel antenna with adjustable non-diffraction beam direction. Background technique [0002] When electromagnetic waves propagate in space, diffraction will occur, and the beam will spread in space. If the transmitting antenna can transmit a non-diffraction electromagnetic beam, the beam will not spread within the transmission range, which will greatly improve the space transmission efficiency of the microwave. The propagation distance of the non-diffracting beam is limited, and its effective area is usually in the near-field area of ​​the antenna. Therefore, the use of non-diffracting beams for near-field microwave energy transmission, such as short-distance wireless charging of automobiles and electronic equipment, has attracted people's attention. There are many types of non-diffracting beams, such as Bessel waves, Mathieu waves, Vortex waves, Caleidoscopic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q1/50H01Q23/00
CPCH01Q1/38H01Q1/50H01Q23/00
Inventor 卢萍黄卡玛杨晓庆
Owner SICHUAN UNIV
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