一种超宽带四脊张角喇叭馈源的研制

Improved Design of a Quadruple-Ridge Ultra-wideband Feed

鉴于超宽带馈源在射电天文以及通信领域中拥有极高的利用价值,设计和研制了一种超宽带四脊张角喇叭馈源。该宽带馈源工作于2~14 GHz,在覆盖了7倍频带宽的同时还拥有良好的照明张角。实验结果显示,该馈源的照明张角大于50°,能够更好地满足大多数主焦反射面的照明。其工作频带上的回波损耗全部优于-10dB,其中,绝大多数频带的回波损耗优于-15 dB。该馈源的辐射方向图在较大的频段跨度上具有稳定的波束宽度以及圆对称性,并且增益大于10 dB。

Uhra-WideBand （UWB） feeds have high utility values in radio astronomy and communications, in this pa- per, we design and implement a quadruple-ridge uhra-wideband feed operating at 2 - 14 GHz. The feed covers 7 octave bandwidth also has large edge illumination angle. Measurements of the manufactured feed show that the edge illumination an- gle is larger than 60%, which can be more suitable for the primary-focus reflector systems. The feed has a return loss of better than -10 dB, even better than -15 dB in most frequencies. Radiation pattern of the feed has stable beam width and better circular symmetry, gain is also more than 10 dB.