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Liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide

A leaky-wave antenna and comb-line technology, which is applied in the field of microwave antenna engineering, can solve problems such as difficult zero-crossing scanning and electronically controlled scanning leaky-wave antennas are difficult to work, and achieve the effects of large power capacity, low loss, and simple control mechanism

Active Publication Date: 2015-11-18
北京超材信息科技有限公司
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  • Abstract
  • Description
  • 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, a liquid crystal electronically controlled zero-crossing scanning leaky-wave antenna based on comb-shaped waveguide is provided

Method used

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  • Liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide
  • Liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide
  • Liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide

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specific Embodiment approach 1

[0030] Specific implementation mode one: the following combination Figure 2 to Figure 5 Describe this embodiment mode, the liquid crystal electronically controlled zero-crossing scanning leaky wave antenna based on the comb-shaped waveguide in this embodiment mode, which includes a top dielectric plate layer 1, a metal layer 2, a liquid crystal layer 3 and a bottom waveguide groove 4;

[0031] A metal layer 2 is arranged between the top dielectric plate layer 1 and the bottom waveguide groove 4, and the bottom waveguide groove 4 is a rectangular plate with a longitudinal groove structure on the upper surface;

[0032] The top dielectric plate layer 1 and the metal layer 2 are tightly integrated into one body through mechanical processing, electroplating, hot pressing or microelectronic technology;

[0033] The bottom waveguide groove 4 is a rectangular plate with a vertical groove structure on the upper surface, and the liquid crystal material is filled between the vertical g...

specific Embodiment approach 2

[0042] Specific implementation mode two: the following combination Figure 6 to Figure 13 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.

[0043] As a special case, Image 6 with Figure 7 The specific design parameters of a liquid crystal waveguide transverse and longitudinal slot leaky wave electronically controlled scanning antenna working at 13.3GHz are given. Depend on Image 6 , the top dielectric plate of the antenna is a microwave substrate, and the relative permittivity ε r =4, loss tangent tanδ=0.004, thickness d 2 =1mm, the thickness of the metal layer is 0.017mm. The antenna consists of N=14 periodic slot units, the unit spacing p=7mm, and the conduction band length l c = 10.5 mm. The length of the longitudinal slit radiation unit is l 1 =10mm, the length of transverse seam l for matching 2 =1mm, distance between horizo...

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Abstract

The invention discloses a liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide, which belongs to the technical field of microwave antenna construction. The problems that a conventional electrical control scanning leaky wave antenna based on a varactor and other traditional electric tuning elements difficultly works in a microwave high frequency band and the existing liquid crystal electrical control fixed-frequency scanning leaky wave antenna is difficult to realize zero-crossing scanning and requires a bias circuit which is specially designed are solved. The antenna provided by the invention comprises a top dielectric plate layer, a metal layer, a liquid crystal layer and a bottom waveguide groove. The metal layer is arranged between the top dielectric plate layer and the bottom waveguide groove. A longitudinal groove structure is arranged on the upper surface of a rectangular plate to form the bottom waveguide groove. The metal layer is in a comb-line structure. N periodic slit units are arranged between two columns of comb teeth on the comb-line structure. N periodic slit units comprise two groups of vertical slit columns and a group of transverse slit column. Through periodic transverse slits, the equivalent series inductance of electromagnetic waves spreading between the bottom waveguide groove and the metal layer is increased. Through periodic vertical slits, the equivalent parallel capacitance is increased.

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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