加载部分均匀覆盖层的Fabry-Perot谐振腔天线设计

Design of a Fabry-Perot Resonant Cavity Antenna with Partially Uniform Superstrate

本文采用了部分均匀覆盖层,设计了一款新型的高增益Fabry-Perot谐振腔天线.该天线覆盖层采用部分均匀结构,划分为3×3个区域,不同区域内贴片的尺寸不尽相同.每个区域内包含5×5个矩形贴片,单元尺寸一致.由于各区域的贴片尺寸不同,使得部分反射层不同区域内的反射系数和透射系数也不同,从而改善了天线口径面上的幅度和相位的均匀度.仿真结果表明,天线的阻抗带宽(|S11|<-10 dB)为3.77%(5.72~5.94 GHz).在工作频率5.8 GHz处,天线的主交叉极化相差30 dB以上,增益达到19.9 dBi.

A novel high-gain Fabry-Perot resonator antenna with partially uniform superstrate was proposed in this paper.The superstrate of the antenna adopted a partially-uniform structure and is divided into sub-regions,and the sizes of the patches in different sub-regions were different.Each region contained a rectangular patches in same size of the element.Due to different sizes,partially reflective surface in different sub-regions had different reflection and transmission coefficients.And thus,the uniformity of amplitude and phase on the aperture surface of the antenna can be effectively improved.The simulated results showed that the impedance bandwidth of the antenna is 3.77%(5.72~5.94 GHz).At the operating frequency of 5.8 GHz,the main cross-polarization difference of the antenna was more than 30 dB,and the gain reachs up to 19.9 dBi.