The paper has proposed a multilayer, polarization rotation featured, low radar cross-section (RCS) antenna using electromagnetic band-gap (EBG)-based frequency selective surface (FSS) at 8.25 GHz. Cross-shaped EBG unit cells offer zero reflection phase and −25 dB reflection magnitude at 8.25 GHz. The FSS layer consists of eight cross-shaped EBG unit cells sandwiched between two substrates to offer high absorptivity at the desired band. The circular patch antenna resonating at 8.25 GHz is placed on the top substrate having a lower dielectric constant. Four circular-shaped patches are etched at the four corners of the top layer and are coupled with two feed lines which are aligned 90° to each other at the bottom layer and interconnected diagonally to achieve polarization rotation. The proposed antenna offers a gain of 6.72 dB and an in-band RCS of −21.4 dBsm. Incident energy is backscattered into eight directions separated by angle ϕ = 45°. The proposed antenna has the RCS reduction band of 7.7–9.4 GHz. It offers normalized polarization rotation ratio more than 0.8 within the −40° to 40° angular region at the frequency band 8–8.5 GHz. The measured result using the fabricated prototype agrees well with the simulated one.

本文提出了一种多层、极化旋转特征、低雷达截面 (RCS) 天线，该天线使用基于电磁带隙 (EBG) 的频率选择表面 (FSS)，频率为 8.25 GHz。十字形 EBG 晶胞在 8.25 GHz 时提供零反射相位和 -25 dB 反射幅度。FSS 层由夹在两个基板之间的八个十字形 EBG 晶胞组成，以在所需波段提供高吸收率。谐振频率为 8.25 GHz 的圆形贴片天线放置在具有较低介电常数的顶部基板上。在顶层的四个角上蚀刻了四个圆形贴片，并与在底层相互成 90° 对齐并对角互连的两条馈线耦合，以实现偏振旋转。建议的天线提供 6 的增益。72 dB 和 -21.4 dBsm 的带内 RCS。入射能量被反向散射到以角度分隔的八个方向φ = 45°。建议的天线具有 7.7-9.4 GHz 的 RCS 缩减频带。它在 8-8.5 GHz 频段的 -40° 至 40° 角区域内提供超过 0.8 的归一化极化旋转比。使用制造的原型的测量结果与模拟结果非常吻合。