Liquid crystal-based electric control scanning waveguide leaky wave antenna

Abstract

The invention particularly relates to a liquid crystal-based electric control scanning waveguide leaky wave antenna, which comprises N unit arrays, wherein N is larger than or equal to 2; the N unit arrays are embedded into a dielectric substrate, and is characterized in that the unit array sequentially comprises a micro-strip line, a dielectric substrate, a lower-layer metal floor, a liquid crystal layer, an upper-layer metal floor and a metal patch from bottom to top. The micro-strip line is located in the middle of the lower surface of the unit arrays; a gap is formed in the middle of the upper-layer metal floor, and the gap is H-shaped when viewed from the side face. Liquid crystal material is filled between the two metal floors and the H-shaped gap; and at least one rectangular gap isformed in the middle of the metal patch. According to the antenna, no phase shifter can be realized, and the target radiation characteristic of the antenna can be realized only by using an amplitude-weighted beam control method to change the amplitude of an array element without changing the phase and the antenna parameters.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, and in particular relates to a liquid crystal electronically controlled scanning waveguide leaky wave antenna. Background technique [0002] Leaky-wave antennas have frequency scanning characteristics in which the beam direction of the main lobe of the antenna changes as the frequency of the fed electromagnetic wave changes. The frequency sweep characteristic of the leaky wave antenna has been widely used in the past, but this frequency sweep characteristic often occupies a relatively wide continuous frequency band resource. Nowadays, with the explosive development of wireless communication, the already limited spectrum resources are increasingly congested, and the frequency scanning characteristics of traditional leaky wave antennas are obviously contradictory to the pursuit of modern communication to improve spectrum utilization. Therefore, in order to solve this contradiction , the...

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Problems solved by technology

However, the existing liquid crystal electronically scanned leaky-wave antennas usually have the following disadvantages: first, it is necessary to use an external controllable magnetic field to match the pattern scanning of the antenna, which makes the control mechanism of the antenna complicated; second, in order to make the liquid crystal The dielectric constant of the antenna changes under the action of an external electric field, and an additional bias circuit needs to be designed for the antenna, and this bias circuit will cause electromagnetic coupling between the low-frequency or DC circuit and the radio-frequency circuit, thereby affecting the radiation characteristics of the antenna. deterioration

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