基于FSS 的双频高增益微带天线

设计并制作了一种基于双屏FSS(Frequency Selective Surface)部分反射表面的双频高增益微带天线。该FSS 结构是在介质板上下表面分别刻蚀两条方环形金属带,通过调节金属带的宽度,实现频比(Frequency Ratio,FR)达到2 的双频谐振,且在5. 12 ~5. 31GHz 和10. 08 ~10.84GHz 频带内反射相位曲线斜率为正(一般的为负),反射系数模值都在0. 86 和0. 82 以上。将FSS 以覆层的形式放置于双频微带天线上方,相当于增加了双频天线的辐射口径面积,有效改善天线的辐射性能。仿真和实测结果表明:与原始双频微带天线相比,加载双频FSS 覆层后,新天线的增益得到了提高,在5.22GHz 和10. 43GHz 处,天线鼻锥方向增益分别提高了4. 8dB 和5. 1dB。

A Dual-Band and High-Gain Microstrip Antenna Based on FSS

A dual-band and high-gain microstrip antenna based on double screen FSS(Frequency Selective Surfaces) partially reflective surfaces is designed and fabricated. The FSS structure is constructed by printing two annular square patches on both sides of the surface respectively. Changing the dimenson of each annular strip patch to achieve dual-band resonances with FR(Frequency Ratio) to 2, positive reflection phase gradients(the general is with negative reflection phase gradients) and the reflection magnitude above 0. 86 and 0. 82 respectively in 5. 12 ~5. 31GHz and 10. 08 ~10. 84GHz. The radiation caliber of microstrip is increased by using FSS as the radome of dual-band microstrip antenna so that the radiation performance is effectively improved. The simulated and measured results show that: comparing to primary antenna, the gain of the antenna with FSS radome is increased by 4. 8 dB and 5. 1 dB at 5. 22 GHz and 10. 43 GHz respectively.