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本文叙述了由二个互补单元所组成的馈源的设计,以及用于小口径抛物面天线(D=10λ)时的辐射特性。这种互补型馈源的特点:设计简单、制造方便,在整个频带内容易匹配,且具有相等的E面、H面波瓣宽度,后瓣电平低等,作为圆口径抛物面天线的馈源是比较合适的。用这种互补单元作为馈源的抛物面天线具有效率高、旁瓣低、交叉极化小等特点。在x波段,天线的最高效率可达0.65,旁瓣电平优于-22dB。
This article describes the design of a feed composed of two complementary elements and the radiation characteristics for small aperture parabolic antennas (D = 10λ). This complementary feed features: simple design, easy manufacture, easy to match in the entire frequency band, and has the same E-plane, H-side lobe width, low back flap, as a circular aperture parabolic antenna feed Is more appropriate. The parabolic antenna with this complementary unit as a feed has the characteristics of high efficiency, low side lobe and small cross-polarization. In the x-band, the maximum antenna efficiency up to 0.65, sidelobe level better than -22dB.