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Multifrequency Spaceborne Deployable Radiometer Antenna Designs
IEEE Aerospace and Electronic Systems Magazine ( IF 3.4 ) Pub Date : 2020-05-01 , DOI: 10.1109/maes.2020.2981795
Wang Hongjian

As part of overall ocean dynamic satellite research, the atmospheric correction microwave radiometer (ACMR) used to correct atmospheric path delay in the radar altimeter has been developed recently. The ACMR, composed of an observing antenna (OA) and calibration antenna, operates at 18.7, 23.8, and 37 GHz for improving atmospheric retrieval accuracy. The dual-polarized OA is realized by an offset deployable dish and the common corrugated horn feeding subsystem, while the calibration antenna uses three corrugated horns. The deployable reflector is made of carbon fiber composite (CFRP) supported by a CFRP frame that connects to the satellite deck, and the deployment of the dish is implemented by two hinges. The feeding subsystem has a loaded-ring corrugated horn, an ultra-wideband orthomode transducer (OMT) that covers almost 2:1 bandwidth ratio and bandpass filters. Compromise is made to guarantee that the root-mean-square errors of the deviation of the phase center from the focal point are as small as possible for the three frequencies. Measured results of the OA showed that the voltage standing-wave ratios (VSWRs) are lower than 1.5 while the cross-polarization levels are below −20 dB throughout the all working bands. Furthermore, the radiation patterns have sidelobe levels below −20 dB, and the antenna main beam efficiencies are all above 90% for the tri-band. The calibration horn antennas have VSWR below 1.2 throughout the tri-band, too. Thermal and vibration tests confirm that the antenna is suitable for space use.

中文翻译:

多频星载可展开辐射计天线设计

作为海洋动力卫星整体研究的一部分,最近开发了用于校正雷达高度计大气路径延迟的大气校正微波辐射计(ACMR)。ACMR 由观测天线 (OA) 和校准天线组成,工作频率为 18.7、23.8 和 37 GHz,以提高大气反演精度。双极化 OA 是通过偏置可展开碟形天线和普通波纹喇叭馈电子系统实现的,而校准天线则使用三个波纹喇叭。可展开反射器由碳纤维复合材料 (CFRP) 制成,由连接到卫星甲板的 CFRP 框架支撑,天线的展开由两个铰链实现。馈电子系统有一个负载环形波纹喇叭,一个覆盖几乎 2 个的超宽带正模换能器 (OMT):1 带宽比和带通滤波器。进行折衷以保证三个频率的相位中心偏离焦点的均方根误差尽可能小。OA 的测量结果显示电压驻波比 (VSWR) 低于 1.5,而交叉极化水平在所有工作频段均低于 -20 dB。此外,辐射方向图的旁瓣电平低于 -20 dB,并且三频天线主波束效率均高于 90%。校准喇叭天线在整个三频中的 VSWR 也低于 1.2。热和振动测试确认天线适合空间使用。进行折衷以保证三个频率的相位中心偏离焦点的均方根误差尽可能小。OA 的测量结果表明,电压驻波比 (VSWR) 低于 1.5,而交叉极化水平在所有工作频段均低于 -20 dB。此外,辐射方向图的旁瓣电平低于 -20 dB,并且三频天线主波束效率均高于 90%。校准喇叭天线在整个三频中的 VSWR 也低于 1.2。热和振动测试确认天线适合空间使用。进行折衷以保证三个频率的相位中心偏离焦点的均方根误差尽可能小。OA 的测量结果表明,电压驻波比 (VSWR) 低于 1.5,而交叉极化水平在所有工作频段均低于 -20 dB。此外,辐射方向图的旁瓣电平低于 -20 dB,并且三频天线主波束效率均高于 90%。校准喇叭天线在整个三频中的 VSWR 也低于 1.2。热和振动测试确认天线适合空间使用。5 而交叉极化水平在所有工作频段都低于 -20 dB。此外,辐射方向图的旁瓣电平低于 -20 dB,并且三频天线主波束效率均高于 90%。校准喇叭天线在整个三频中的 VSWR 也低于 1.2。热和振动测试确认天线适合空间使用。5 而交叉极化水平在所有工作频段都低于 -20 dB。此外,辐射方向图的旁瓣电平低于 -20 dB,并且三频天线主波束效率均高于 90%。校准喇叭天线在整个三频中的 VSWR 也低于 1.2。热和振动测试确认天线适合空间使用。
更新日期:2020-05-01
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