宽带相控阵馈源可展开反射面天线研究

A broadband deployable reflector antenna with phased array feed

为满足星载高增益天线的应用需求,本文设计了一种带有相控阵馈源的伞状可展开反射面天线。首先介绍了反射面天线可展开机构的原理及设计,由碳纤维天线肋和金属编织网面组成反射面,在高精度可展开机构的动作下实现其收拢和展开,从而大幅减小其收藏包络尺寸。对于直径为1.14 m的可展开反射面天线设计了宽带相控阵馈源,采用金属Vivaldi天线作为相控阵单元,根据极化方式、焦径比和扫描范围选择排列成双极化矩形阵列,使可展开反射面天线在8~16 GHz内实现二维波束扫描,通过电磁仿真进行验证,仿真结果表明,宽带相控阵馈源能够有效地增加可展开反射面天线的视场,反射面天线在8 GHz、12 GHz和16 GHz时扫描到0°的增益分别是38.03 dB、40.65 dB和41.48 dB,扫描到+3°的增益分别是37.68 dB、40.68 dB和41.09 dB。

An umbrella-shaped deployable reflector antenna with phased array feed is designed to meet the requirements of spaceborne high-gain antenna in this paper.Firstly,the principle and design of the deployable mechanism of reflector antenna are introduced.The reflector consists of carbon-fiber rid and braided metal net,which can be closed and expanded under the action of the high-precision deployable mechanism,thus greatly reducing the size of the collection envelope.A wideband phased array feed is designed for the 1.14-meter aperture deployable reflector antenna,and the metal Vivaldi antenna is used as the element of the phased array.According to the polarization mode,the reflector f/D and scanning range,a rectangular dual-polarized Vivaldi array is arranged and used,realizing a two-dimensional scanning range in the frequency range of 8~16 GHz.Simulation results show that antenna gain at 8 GHz,12 GHz,16 GHz is 38.03 dB,40.65 dB and 41.48 dB scanning to 0°,and 37.68 dB,40.68 dB and 41.09 dB scanning to+3°respectively,validating the wideband phased array feed can effectively increase the field of view of the deployable reflector antenna.