论文标题
用于精确天线的调制介电元额的合成
Synthesis of Modulated Dielectric Metasurfaces for Precise Antenna Beamforming
论文作者
论文摘要
本文提出了一种端到端的设计方法，用于合成具有调节厚度的介电元面积，能够以高精度在远场中实现所需的辐射模式。该方法依赖于积分方程和矩的方法来计算给定入射照明的整个元图的诱导表面和体积密度。通过避免介电层的均匀化并通过矩的方法直接计算散射场，可以准确预测和优化跨面的近场和远场响应。特别地，提出了一个由单个嵌入式线路源馈入的调制电介质元图的设计示例，以实现具有-20 dB sidelobe级别的Chebyshev阵列模式。此外，设计了3D打印和测量的外部喂养的介电元面性能梁分裂，显示了 +-30度时的两个反射光束，对镜面反射（> 14 dB）的高抑制作用，并与模拟和所需的辐射模式令人满意。提出的用于使用介电元面横梁形成的设计方法可以在较高的频率下找到应用，在较高的频率上，由于欧姆的损失和制造挑战较高，因此使用铜可能会出现问题。
This paper presents an end-to-end design method for the synthesis of dielectric metasurfaces with modulated thickness that are able to realize desired radiation patterns in the far-field with high precision. The method relies on integral equations and the Method of Moments to calculate the induced surface and volumetric current densities throughout the metasurface upon a given incident illumination. By avoiding homogenization of the dielectric layer and calculating directly the scattered fields through the Method of Moments, the near-field and far-field response of the metasurface can be accurately predicted and optimized. In particular, a design example of a modulated dielectric metasurface, fed by a single embedded line source, is presented for the realization of a Chebyshev array pattern with -20 dB sidelobe level. Moreover, an externally-fed dielectric metasurface performing beam splitting of a normally-incident plane wave is designed, 3-D printed and measured, showing two reflected beams at +-30 degrees, high suppression of specular reflections (> 14 dB) and satisfactory agreement with the simulated and desired radiation patterns. The proposed design method for beamforming with dielectric metasurfaces can find application in higher frequencies where the use of copper may be problematic due to higher ohmic losses and fabrication challenges.
