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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。
In view of the extremely high value of UWB feed in the field of radio astronomy and communication, an UWB quad ridge feeder is designed and developed. The wideband feed operates at 2 to 14 GHz and provides good illumination angle coverage over a 7x bandwidth. Experimental results show that the illumination angle of the feed is greater than 50 °, which can better meet the illumination of most of the main coke reflector. All of the return loss in its working band is better than -10dB, of which the return loss in most of the bands is better than -15 dB. The radiation pattern of the feed has a stable beamwidth and circular symmetry over a larger span of the frequency band with a gain greater than 10 dB.