摘要
针对谐振腔天线因口径场相位分布不均匀引起的增益较低问题,设计了一款惠更斯超表面相移层,并将其加载到谐振腔天线上,用于修正谐振腔天线口径场的不均匀相位分布,从而实现高增益。该惠更斯超表面由平行和垂直于波传播方向的两组开口谐振环组成。两组开口谐振环分别与入射电磁波的磁场和电场谐振响应,从而影响电磁波的反射与透射性能。通过分别调节两组开口谐振环的尺寸,可以得到不同的电场与磁场谐振强度,从而实现超表面相移层的快速设计。为验证方法的有效性,设计了一款工作频率5.8 GHz的惠更斯超表面相移层,并将其应用于一款直径为180 mm的圆柱型谐振腔天线。对加载惠更斯超表面相移层的谐振腔天线进行了加工实测,其实测结果与仿真吻合良好。仿真和实测结果表明:所设计的相移层具有360°的相移范围,且透射系数幅值大于0.99;通过加载惠更斯超表面相移层,谐振腔天线的口径场相位分布更加均匀,其增益从原有的14.90 dB增加至18.31 dB,口径效率从25.9%提高至56.7%。
In order to obtain a high gain,a Huygens’metasurface was proposed as the phase shift surface(PSS)for the resonant cavity antenna(RCA)to uniformize the field phase distribution over the RCA’s aperture.The metasurface consists of two sets of split ring resonators(SRRs),which are parallel and perpendicular to the incident electromagnetic wave,respectively.The SRRs resonate with the magnetic and electric field of the incident wave,and thus the metasurface is able to manipulate the reflection and transmission of the incident wave.By configuring the dimensions of the SRRs independently,the magnetic and electric resonances can be adjusted respectively,and thereby a fast design of the PSS is achieved.To verify the proposed method,a PSS sample with an operating frequency of 5.8 GHz was designed and applied to a cylindrical RCA with a diameter of 180 mm.The RCA with the PSS was fabricated and the measurement agrees will with the simulation.The simulated and measured results demonstrated that the PSS had a phase shift range of 360°with a minimum transmission magnitude of 0.99 and the RCA with the PSS obtained a more uniform field phase distribution over the antenna’s aperture.The RCA’s gain was enhanced from 14.90 dB to 18.31 dB,and the aperture efficiency was enhanced from 25.9%to 56.7%.
作者
周林
陈星
段鑫
ZHOU Lin;CHEN Xing;DUAN Xin(College of Electronics and Info.Eng.,Sichuan Univ.,Chengdu 610065,China)
出处
《工程科学与技术》
EI
CAS
CSCD
北大核心
2018年第6期232-236,共5页
Advanced Engineering Sciences
基金
国家自然科学基金委员会与中国工程物理研究院联合基金资助项目(NSAF基金[U1230112])
关键词
天线
相移
超材料
antennas
phase shift
metamaterials
