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Fixed frequency scanning leaky-wave antenna based on liquid crystal material

A technology of liquid crystal material and leaky wave antenna, which is applied in the direction of antenna, antenna grounding switch structure connection, radiation element structure, etc., can solve the problems of low maturity of theory and technology, lack of design method, difficult processing of liquid crystal material, etc., to achieve The effect of fast response time, large scanning angle, and small bias voltage

Active Publication Date: 2015-03-11
北京超材信息科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, liquid crystal materials are not easy to process due to their special material state, so a good electronic control mechanism becomes a crucial part in the design of adjustable antennas, but the maturity of theory and technology in this respect is not high, and the corresponding design methods are also very lacking

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  • Fixed frequency scanning leaky-wave antenna based on liquid crystal material
  • Fixed frequency scanning leaky-wave antenna based on liquid crystal material
  • Fixed frequency scanning leaky-wave antenna based on liquid crystal material

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specific Embodiment approach 1

[0025] Specific implementation mode 1. Combination Figures 1 to 5 Describe this specific embodiment, the fixed-frequency scanning leaky wave antenna based on liquid crystal material, which includes a dielectric cover plate 1-1, a transmission and leaky wave structure 1-2, a dielectric substrate 1-3 and a metal floor 1-4;

[0026] The dielectric cover 1-1, the transmission and leaky wave structure 1-2, the dielectric substrate 1-3 and the metal floor 1-4 form a four-layer structure from top to bottom; the dielectric cover 1-1 and the transmission and leaky wave structure Liquid crystal is encapsulated between 1-2;

[0027] The transmission and leaky wave structure 1-2 includes two 50-ohm microstrips 1, two trapezoidal matching circuits 2, a microstrip line 3 with the same width as the antenna main body, a conduction band 9 between units, and 2N finger capacitor units, N is a positive integer;

[0028] The wide ends of the two ladder matching circuits 2 are respectively conne...

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Abstract

The invention provides a fixed frequency scanning leaky-wave antenna based on a liquid crystal material, and relates to a fixed frequency scanning leaky-wave antenna, which aims to meet the requirements on the leaky-wave antenna with excellent electric tuning performances and a simple electric control mechanism. According to the fixed frequency scanning leaky-wave antenna, a micro-strip-like line structure is adopted for a leaky-wave antenna main body, and the two ends of the leaky-wave antenna main body are gradually-changed line matching circuits. Interdigitating structures and grounding metal through holes are adopted for a radiation main body, so that needed series capacitor and shunt inductors are realized; and a liquid crystal is filled into a gap between the interdigitating structures. The interdigitating structure located at the outer side is separated from an inner side part by the gap and the gap is used for isolating direct current and bias voltage and is also one part of an interdigitating capacitor. The bias voltage is applied to a shutter island formed by the interdigitating structure at the outer side, and the deflection of liquid crystal molecules located between the interdigitating structures is adjusted by a potential difference formed between the interdigitating structure at the outer side and the interdigitating structure at the inner side, so that relative dielectric constants of the liquid crystal material are controlled; and finally, a wave beam scanning angle of the leaky-wave antenna is controlled. The fixed frequency scanning leaky-wave antenna based on the liquid crystal material is applicable to the field using an electric control scanning antenna.

Description

technical field [0001] The invention relates to a fixed frequency scanning leaky wave antenna. Background technique [0002] Leaky wave antenna, as a traditional electrically controlled scanning antenna, is widely favored because of its high radiation efficiency. In the microwave and millimeter wave bands, the leaky wave antenna can play a good role. However, the leaky-wave antenna can only realize pattern scanning by changing the operating frequency, and cannot realize pattern scanning at a certain fixed frequency, thus limiting the application range of the leaky-wave antenna. [0003] In modern communication systems, the fixed-frequency scanning capability of the antenna pattern is very important, which can greatly simplify the system configuration. Therefore, in recent years, people are keen to make the leaky-wave antenna have a fixed-frequency scanning capability, so that the radiation efficiency level of the existing electronically controlled scanning antenna can be i...

Claims

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Application Information

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IPC IPC(8): H01Q1/50H01Q3/00H01Q1/38
Inventor 孟繁义
Owner 北京超材信息科技有限公司
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