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设计了一种新型超宽带低散射全向天线,由四组非对称条状叉形辐射单元均匀放置在金属杆水平面上实现。其中,非对称叉形辐射单元能够产生的两个谐振频点,有利于拓展天线带宽。狭窄的条形结构,有效减小了雷达散射截面面积。使用ANSYS HFSS软件对设计的新型超宽带低散射全向天线进行仿真和优化,结果表明,该新型天线能够覆盖487~915 MHz频段(相对带宽61%),电压驻波小于2,487~740MHz频段内,天线全向性能良好,不圆度小于3d B。
A new type of ultra-wideband and low-scattering omnidirectional antenna is designed. It consists of four groups of asymmetric strip-shaped fork radiation units uniformly placed on the metal rod horizontal plane. Among them, the asymmetrical fork radiation unit can produce two resonant frequency points, help to expand the antenna bandwidth. Narrow strip structure, effectively reducing the cross-section of the radar cross-section. The results show that the new antenna can cover 487 ~ 915 MHz frequency band (61% relative bandwidth) and the VSWR is less than 2,487 ~ 740MHz. The new antenna is designed and simulated with ANSYS HFSS software. Antenna omnidirectional performance is good, less than 3dB roundness.