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在上述七章中我们已经论述了各种波纹喇叭的内场。由此可以得到喇叭孔径的电磁场,在本章中我们将要论述由喇叭孔径场计算其辐射特性的方法。按照一般面天线理论,可以用朱兰成辐射公式计算喇叭的辐射场。但对于小孔径喇叭,由于法兰和喇叭外壁的作用,交叉极化场的实测结果与朱兰成辐射公式的计算结果差别较大,因此对于小孔径喇叭朱兰成辐射公式只适用于主极化辐射场;而应该用所谓E场模公式计算交叉极化辐射场。孔径大小可以大致以三个波长为分界线。
In the last seven chapters we have discussed the inner fields of various corrugated speakers. From this we can get the electromagnetic field of the horn aperture. In this chapter we will discuss how to calculate the radiation characteristics of the horn aperture field. According to the general plane antenna theory, you can use the Juran Cheng radiation formula to calculate the speaker’s radiation field. However, for small-aperture speakers, the measured results of the cross-polarization field differ greatly from those of the Ju Lan-cheng radiation formula due to the effect of the flange and the outer wall of the speaker. Therefore, the formula for the small aperture speaker Juran-che radiation is only applicable to the main polarization radiation field; Instead, the so-called E-field mode should be used to calculate the cross-polarized radiation field. The size of the aperture can be roughly divided by three wavelengths.