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第五代国际通信卫星使用4/6频段的频率复用体制,而卫星直播电视则使用12/14频段。这就要求天线的湍源喇叭具有低驻波比、低交叉极化和多频段共用的性能。本文中,频率f的单位都用GHz,4频段指f为3.7—4.2,6频段指f为5.925—6.425,12频段指f为10.95—12.4,14频段指f为14.0—14.5。本文阐述用直槽波纹圆锥喇叭和环加载波纹圆锥喇叭来获得低驻波比、低交叉极化和多频段共用的馈源喇叭的理论,并介绍一个具有这种性能的部分环加载波纹圆锥喇叭。实验表明,这个喇叭至少能作为4,6,12GHz三个频段的多频段共用,在f=3.5—6.425内,它的交叉极化峰值电平优于-25dB;在f=10.95—12.4内,它的辐射图也很好。这个喇叭可以作为4/6频段的频率复用地面站天线和12频段的直播电视接收天线的馈源喇叭。特别是可以作为在f=3.7—6.425这么宽的频带内具有高交叉极化性能的天线并且还要在f=10.95-12.4这么宽的频带内具有良好性能的天线的初级馈源,这在目前看来,还是少见的。在本文中,理论结果与实测结果的吻合程度是令人满意的。计算值还表明,此喇叭在f=14.0-14.5也具有良好的辐射图。
The fifth generation of international telecommunications satellites use the frequency reuse scheme in the 4/6 band, while the satellite live television uses the 12/14 band. This requires that the antenna’s turbulent-source horn has low VSWR, low cross-polarization and multi-band commonality. In this paper, the unit of frequency f is GHz, the band 4 means f is 3.7-4.2, the band f means 5.925-6.425, the band f means 10.95-12.4, the band 14 means f is 14.0-14.5. This article describes the theory of using a grooved corrugated cone horn and a ring-loading corrugated cone horn to obtain a feed horn with low VSWR, low cross-polarization and multi-band sharing, as well as a partially loaded corrugated cone horn with this type of performance . Experiments show that this speaker can be used as at least 4,6,12 GHz frequency band of the three bands sharing, in f = 3.5-6.425, its peak cross-polarization peak level better than -25dB; f = 10.95-12.4, Its radiation pattern is also good. This speaker can be used as a 4/6 frequency multiplexed ground station antenna and 12-channel broadcast television receiving antenna feed horn. Especially as a primary feed for an antenna with good cross-polarization performance in such a wide frequency band of f = 3.7-6.425 and also with good performance in a frequency band of f = 10.95-12.4, It seems, is still rare. In this paper, the theoretical results are in good agreement with the measured results. Calculations also show that this horn also has a good radiation pattern at f = 14.0-14.5.