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应用预测矩形喇叭远场辐射方向图的口径场理论,设计了一个工作在2.4:1的频带内、E面和H面三分贝波束宽度分别为17°和10°的波束宽度基本恒定的喇叭。假设喇叭在E面和H面的口径场为余弦分布,首先得出的一般结论是在最低的工作频带上,口径相位误差为0.37波长时,就能够在频带内使三分贝波束宽度的变化最小。得到了以喇叭颈部长度为函数的“恒定”波束宽度的一般设计曲线,它有助于三分贝波束宽度为9°～27°的这种喇叭的设计。喇叭的E面是波纹壁,为了覆盖2.4:1的宽带,波纹槽制成“T”形,这种T形槽是根据简单的传输线模型而设计的。为了实现这种特定的波束宽度,采用了混合喇叭。给出了从原型喇叭获得的某些实验结果。
Based on the field theory of the far field radiation pattern of the rectangular speaker, a loudspeaker with constant beamwidth of 17 ° and 10 ° is designed, which operates in the 2.4: 1 frequency band. Assuming that the horn has a cosine distribution in the E and H plane, the general conclusion first comes from the fact that at the lowest operating frequency band, the change in the three-decibel beam width within the frequency band is minimized when the aperture phase error is 0.37 . A general design curve for the “constant” beamwidth as a function of horn neck length is obtained, which aids in the design of such a horn with a decibel beam width of 9 ° to 27 °. The E-surface of the horn is a corrugated wall. To cover a broadband of 2.4: 1, the corrugated groove is made “T”, which is designed with a simple transmission line model. In order to achieve this particular beamwidth, a hybrid horn is used. Some experimental results obtained from prototype loudspeakers are given.