基于顺序旋转馈电的Ka波段圆极化天线阵设计

Ka-band circularly polarized microstrip antenna array design using sequential rotary feed technology

针对航空航天、雷达和通信系统对定向性平面圆极化天线阵的需求,本文研究并实现了Ka波段宽带圆极化16单元微带天线阵。该天线阵以角截断微带贴片作为基本谐振单元,采用顺序旋转馈电技术构造成4元阵列,并再次对4元阵应用顺序旋转馈电技术,得到16元天线阵列以获得高增益。通过计算电磁学仿真软件对天线性能进行了分析,并使用Rogers 5880制作了天线实物,仿真和测量结果符合得很好。研究结果表明,在29.08~31.22 GHz频段内,天线阵的反射系数小于-10 dB,轴比小于3 dB,相对带宽超过13.8%,验证了通过顺序旋转技术,可以有效地实现高增益平面圆极化天线阵。

In this study,we developed a broadband circularly polarized 16-element microstrip antenna array oper⁃ating in a Ka-band to meet the demand for directional plane circularly polarized antenna arrays typically used in aviation and aerospace,radar,and communication systems.We also developed basic resonant elements of the proposed antenna array from the angular truncated microstrip patches.First,we constructed an antenna array with four basic radiation elements using the sequential rotation feed technology,after which we applied the se⁃quential rotation technology to the 4-element array again to obtain a 16-element antenna array for the purpose of achieving a high gain.Then,we analyzed the performance of the antenna using the simulation software of compu⁃tational electromagnetics.The proposed antenna array was manufactured by Rogers 5880.The simulation and measurement results showed good agreement.Furthermore,the reflection coefficient of the antenna array was less than-10 dB,the axial ratio was less than 3 dB,and the relative bandwidth exceeded 13.8%in the frequency band of 29.08~31.22 GHz.Finally,we verified that the circular polarization antenna array can be effectively de⁃signed and manufactured by sequential rotation technology.