恒阻抗TEM喇叭辐射特性

Radiant characteristics of TEM horn with constant impedance

提出了馈电系数概念,采用时域有限差分法(FDTD),分析了恒阻抗喇叭辐射主轴辐射电场脉冲峰峰值与距离之积以及喇叭馈电系数与喇叭几何尺寸的关系,得到了主轴上辐射电场峰值及脉冲持续时间随喇叭口径尺寸和喇叭臂长以及喇叭夹角的变化特性,为TEM喇叭天线的设计和性能评估提供了参考。

In this paper, the radiation characteristics of constant impedance TEM horn of various geometrical structures are calculated. In each calculation, peaktopeak value of axial electric field obtained from an equivalent ideal aperture is used to normalize electric fields along axial of practical antennas. The specific value is defined as feeding coefficients and then applied to determine how the radiation properties of the horns can be affected if the horn structure is adjusted. These results provide a basis to design and fabricate practical ultrawideband antenna.