本文描述一种光生等离子体菲涅尔波带板天线的设计方法。利用中心波长为808nm 的近红外激光器阵列通过光学掩膜(菲涅尔波带板的照相底片)照射高电阻率的硅片,使硅片呈现出菲涅尔波带板的衍射特性,实现对入射毫米波的聚焦。给出了这种天线在94GHz 处的实验验证,并得到了4dB 的天线增益效果。

The design method of a photoinduced plasma Fresnel zone plate antenna is described. A near infrared laser array with its central wavelength of 808 nm is used to illuminate a high resistivity silicon wafer throuh an optical mask (the negative of a Fresnel zone plate). Then , the illumiated wafer exhibits the disfraction characteristics of 山the Fresnel zone plate and hence realizes the focusing of the incident millimeter wave. This anntena is verified experimentally at the frequency of 94GHz and its gain is up to 4dB.