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

摘要:

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。

Abstract:

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.