短波小型化软振子对数周期天线设计和实现

Design and Realization of Miniaturized HF Soft Log-Periodic Dipole Antenna

针对传统短波对数周期天线尺寸大、架设困难等问题,提出了一种工作在4~30 MHz的小型化短波软振子对数周期天线。该天线采用立体三角形偶极子和平面四边形偶极子等宽带天线作为振子单元,并将结构拉线作为最长振子加载,有效扩展天线的最低工作频率;同时最长天线振子采用折合偶极子形式,减小了侧翼桁架对天线性能的影响。电磁计算软件FEKO仿真与样机测试表明,该天线在工作频段内具有较小的电压驻波比和稳定的方向性。

The conventional high frequency Log-periodic Dipole Antenna(LPDA)is very large in the lateral size,causing the construction difficulty.A miniaturized soft High Frequency(HF)LPDA work in 4 MHz to 30 MHz is presented.The elements of the antenna adopt three-dimensional triangular dipole and plane quadrilateral dipole,and the stay wires are loaded as the longest element,so that the work frequency of antenna is effectively extended.The longest antenna element adopts folded dipole antenna,which eliminates the influence flank truss on antenna performance.Full-wave simulation and test results showed a stable directional pattern and lower Voltage Standing Wave Ratio(VSWR)over the impedance.