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Electric control zero crossing scanning waveguide leaky-wave antenna based on liquid crystal

A leaky wave antenna and scanning wave technology, applied in the directions of antennas, antenna supports/installation devices, electrical components, etc., can solve the problems of difficult zero-crossing scanning and difficult operation of electronically controlled scanning leaky wave antennas, and achieve large power capacity, The effect of low loss and stable structure

Active Publication Date: 2015-10-28
北京超材信息科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the traditional electronically controlled scanning leaky wave antenna based on traditional electric adjustment elements such as varactor diodes is difficult to work in the microwave high frequency band and that the existing liquid crystal electronically controlled fixed frequency scanning leaky wave antenna is not easy to realize zero-crossing scanning and To solve the problem of specially designed bias circuit, an electronically controlled zero-crossing scanning waveguide leaky wave antenna based on liquid crystal is provided

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  • Electric control zero crossing scanning waveguide leaky-wave antenna based on liquid crystal
  • Electric control zero crossing scanning waveguide leaky-wave antenna based on liquid crystal
  • Electric control zero crossing scanning waveguide leaky-wave antenna based on liquid crystal

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specific Embodiment approach 1

[0028] Specific implementation mode one: the following combination Figure 2 to Figure 5 Describe this embodiment mode, the electronically controlled zero-crossing scanning waveguide leaky-wave antenna based on liquid crystal in this embodiment mode, which includes a top dielectric plate layer 1, a metal layer 2, an insulating glue layer 3, a liquid crystal layer 4 and a bottom waveguide groove 5;

[0029] The lower surface of the top dielectric plate layer 1 is provided with a metal layer 2. The metal layer 2 is a leaky wave structure etched with periodic transverse and longitudinal slits. The equivalent series inductance when propagating between 2 increases, and the periodic longitudinal slits in it increase the equivalent parallel capacitance when the electromagnetic wave propagates between the bottom waveguide slot 5 and the metal layer 2;

[0030] The top dielectric plate layer 1 and the metal layer 2 are tightly integrated into one body through mechanical processing, ele...

specific Embodiment approach 2

[0041] Specific implementation mode two: the following combination Figure 6 to Figure 12 This implementation mode is described, and the antenna structure of the first implementation mode is further described in this implementation mode in combination with specific examples.

[0042] As a special case, Figure 6 and Figure 7 The specific design parameters of a liquid crystal waveguide transverse and longitudinal slot leaky wave electronically controlled scanning antenna working at 8.9GHz are given. Depend on Figure 6 , the top dielectric plate of the antenna is single-sided Rogers RO4350 microwave plate, the relative permittivity ε r =4, loss tangent tanδ=0.004, thickness d 2 =1mm, the thickness of the bottom metal layer is 0.017mm. The antenna is composed of N=20 periodic slot units, and the unit spacing p=10mm. The length of the longitudinal slit radiation unit is l 1 =18mm, length l of horizontal seam for matching 2 =1.5mm, distance between horizontal and vertical...

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Abstract

The invention provides an electric control zero crossing scanning waveguide leaky-wave antenna based on liquid crystal, belongs to the technical field of microwave antenna engineering, and aims at solving problems that a conventional electric control scanning leaky-wave antenna based on a varactor and other conventional electrically controlled elements is difficult to work at a microwave high-frequency band, and zero crossing scanning of existing liquid crystal electric control fixed-frequency scanning leaky-wave antennas is not easy to realize and the special design of a bias circuit is required. The electric control zero crossing scanning waveguide leaky-wave antenna comprises a top part dielectric plate layer, a metal layer, an insulation paste layer, a liquid crystal layer and a bottom part waveguide slot. The metal layer is arranged at the lower surface of the top part dielectric plate layer. The metal layer has a leaky-wave structure with etching of periodic transverse seams and longitudinal seams. Equivalent series inductance of electromagnetic wave is enabled to be increased by the periodic transverse seams when electromagnetic wave is transmitted between the bottom part waveguide slot and the metal layer. Equivalent parallel induction of electromagnetic wave is enabled to be increased by the periodic longitudinal seams when electromagnetic wave is transmitted between the bottom part waveguide slot and the metal layer. The metal layer is provided with N periodic seam units and two conduction bands. The N periodic seam units include two groups of longitudinal seam columns and a group of transverse seam columns.

Description

technical field [0001] The invention belongs to the technical field of microwave antenna engineering. It can be widely used in modern wireless mobile communication, satellite communication in motion and various radar systems. Background technique [0002] Since the leaky wave antenna was proposed by W.W.Hansen in the 1940s, its unique radiation characteristics and excellent lobe scanning characteristics have made the leaky wave antenna a hot spot in the field of antenna research. The original leaky wave antenna is composed of a slotted rectangular waveguide, and its essence is that when the electromagnetic wave propagating on the waveguide structure is a fast wave, it will radiate part of the electromagnetic wave to the space. In recent decades, research on leaky-wave antennas has developed rapidly, especially planar leaky-wave antennas have been widely studied, because planar leaky-wave antennas can be directly processed on printed circuit boards (PCBs), with low profile, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/22H01Q1/38H01Q23/00H01Q3/22
Inventor 孟繁义
Owner 北京超材信息科技有限公司
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