一、引言为了获得旋转对称波束和极低的旁瓣,曾对双模喇叭,波纹喇叭和其他形式的喇叭进行了研究。喉部有陡峭的波导接合段的双模喇叭在很大程度上取决于频率。波纹喇叭在宽带范围内虽能保持良好的辐射方向图,但过于笨重难以制造。采用其他方法不是结构复杂就是体积庞大。作者发现,只要在喇叭内放置一薄的介质套,就能作出宽带的双模喇叭天线。本文讨论这种天线的原理,结构及所测得的辐射方向图。作为介质加载喇叭天线应用之一的一种赋形天线,文中也作 I. INTRODUCTION In order to obtain rotationally symmetric beams and very low side lobes, dual-mode speakers, corrugated speakers and other forms of loudspeakers have been studied. The bimodal horn with a steep waveguide junction in the throat depends very much on the frequency. Corrugated speakers in the broadband range although it can maintain a good radiation pattern, but too bulky and difficult to manufacture. Using other methods is not complex structure is bulky. The authors found that a wideband dual mode horn antenna could be made as long as a thin media jacket was placed inside the horn. This article discusses the principle of this antenna, the structure and the measured radiation pattern. As a media loading horn antenna application of a shaped antenna, the text also made