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本文提出一种新颖的正交圆极化双频高效率圆锥喇叭。其原理是在光壁喇叭中放置两个相距一定间隔的介质带。在低频区工作时,基本上只有靠近喇叭口径的介质带对辐射图的等化作出贡献;而在高频区,两个介质带共同对辐射图的等化作出贡献。适当选择这两个介质带的尺寸,即可在高、低频区都获得波瓣等化、旁瓣电平低的喇叭方向图。从而,把“介质加载”技术推广到双频圆极化的应用。 文中介绍了一个设计实例。该喇叭工作于频率比为1:1.40的两个频区中。在每个频区中,方向图的等化带宽约为10％。输入电压驻波比在高、低频区的使用频段中分别小于1.05和1.12。
This paper presents a novel quadrature circularly polarized dual-frequency high-efficiency cone speaker. The principle is placed in the light wall speaker two spaced apart media strip. In the low-frequency range, essentially only the dielectric band near the horn diameter contributes to the equalization of the radiation pattern, whereas in the high-frequency area, the two dielectric bands together contribute to equalization of the radiation pattern. Proper selection of the size of these two media strips gives you equalized lobes and low sidelobes in the high and low frequency bands. Thus, the “media loading” technology is extended to dual-frequency circular polarization applications. This article describes a design example. The horn works in two frequency bands with a frequency ratio of 1: 1.40. In each frequency region, the equalization bandwidth of the pattern is about 10%. The VSWR of the input voltage is less than 1.05 and 1.12 respectively in the frequency bands of high and low frequencies.