宽频带高增益共口径双圆极化捷变天线设计  

The design of wideband high gain co-caliber dual circular polarization-agile antenna

作　　者：马世娟 王建[1] 司海峰[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731

出　　处：《电子设计工程》2016年第14期97-100,共4页Electronic Design Engineering

摘　　要：为了提高低截获概率雷达系统的性能,针对低截获概率设备对发射天线的需求,文中设计了一种宽频带、高增益、共口径双圆极化天线,通过控制端口馈电方式实现左右旋圆极化捷变。同时,该天线可通过频率变化实现波束扫描与多波束功能。设计了波导缝隙单元结构、19单元线阵及19×12面阵。为了抑制栅瓣的产生,利用介电常数为2.3的聚四氟乙烯部分填充于波导腔中。根据天线结构的特殊性设计了波导/同轴转接器。天线整体仿真优化结果表明,线阵增益为19 d B,面阵平均增益为30 d B。在绝对带宽3.75 GHz范围内该面阵天线的驻波比小于1.1,轴比小于3d B,相对带宽可达13.5%。从而简化了极化捷变天线的结构,减小了天线体积,满足了低截获概率雷达对发射天线的需求。In order to improve the performances of low probability of intercept（LPI） radar systems, for meeting the needs of LPI equipment to the transmit antenna, a wide bandwidth, high gain, total diameter dual circularly polarized antenna is designed in this paper., the polarization agility can be realized by controlling the port feed method. The design antenna can be achieved with a beam scanning and multi-beam function by changing frequency. Waveguide slot unit structure, line array composed by 19 units and plane array composed by 12 line arrays are designed. The use of Teflon with dielectric constant of2.3 is filling into the waveguide cavity to suppress grating lobes. According to the particularity of the antenna structure, a waveguide and coaxial adapter is designed to feed. The overall optimization of antenna simulation results show that, the gain of line array is 19 d B and the average gain of plane array is 30 d B. The VSWR is below 1.1 at the absolute bandwidth of 3.75 GHz, and the relative bandwidth is up to 13.5%. The designed antenna simplifies the structure of the polarization agility antenna, reduces the antenna size, which meets the needs of LPI radar transmitting antenna.

关 键 词：KA波段 波导缝隙 双圆极化 极化捷变 

分 类 号：TN819.1[电子电信—信息与通信工程]