基于聚合物-陶瓷复合材料的异形龙伯透镜天线的研究及制造

Research and Fabrication of a Special-shaped Luneburg Lens Antenna Based on Polymer-Ceramic Composite Material

针对目前龙伯透镜在工程应用中材料发展不成熟、质量大等问题,提出了一种质量小、性能优异的新型异形龙伯透镜天线。首先基于准保角变换法对低介电常数龙伯透镜进行压缩得到了一款高介电常数椭圆龙伯透镜,然后采用球形与椭球的特殊组合结构,得到了一款工作于X波段的高介电常数异形龙伯透镜天线。最后,利用聚二甲基硅氧烷(PDMS)和钛酸锶(Sr TiO3)陶瓷粉体混合而成的聚合物-陶瓷复合材料制备了该透镜,将制备好的聚合物-陶瓷复合材料注入3D打印的模具中来说明异形龙伯透镜的制作过程。测试结果表明,所制作的透镜天线在8.5 GHz、10 GHz、12 GHz时的最大增益值分别为20.8 d Bi、22.4 d Bi、22.6 d Bi,旁瓣电平均低于-19 d B,方位面上3 d B波束宽度小于9.8°。所提出的异形龙伯透镜具有质量轻、材料制备过程简单、制作周期短且在低温下即可无缝成型的优良特点。

Ahigh-dielectric constant special-shaped Luneburg lens with low quality and excellent performance was proposed in this work to solve the prob-lem of the traditional Luneburg lens,such as the immature material development and heavy weight.The special-shaped Luneburg lens obtained by compressing a low-dielectric-constant Lumberg lens by the quasi-conformal transformation method were composed of a spherical Luneburg lens and two elliptical Luneburg lenses.The polymer-ceramic composites made of polydimethylsiloxane(PDMS)and strontium titanate(SrTiO3)ceramic powder was injected into the 3D printed mold to illustrate the fabrication process of the special-shaped Luneburg lens.The pro-posed lens had the excellent characteristics of high gain and low side lobe,which were validated by good agreement between the measurement and the simulation.The fabricated lens antenna had a maximum gain value of 20.8 dBi,22.4 dBi,22.6 dBi at 8.5 GHz,10 GHz and 12 GHz,the side lobe level was lower than-19 dB,and the 3 dB beamwidth on the azimuth plane was lower than 9.8°,In addition,the proposed lens is light in weight,simple in material preparation process,and short in fabrication period.The major advantage of the proposed method is the capa-bility to allow the special-shaped Luneburg lens to be fabricated at low temperature in a seamless manner.