Thermo-mechanical guidelines for enhanced space hybrid tr modules design

In last decades SAR (Synthetic Aperture Radar) antenna technology is fully oriented to the improvement of resolution and flex- ibility of the surveillance service. The civilian and military applications, more and more challenging, represent a continuous stimulus to better the satellite synthetic aperture radar technology spherically intended. The core of the SAR technology are the Transmitting and Receiving Modules, commonly named TRM, where the receiving and transmitting radio frequency chains are hosted into. The signal coming from and toward the Earth surface are processed and amplified by the integrated circuit mounted on the TR modules. This technology is normally known such as Hybrid Technology by exploiting different material and different sub-techniques in order to reduces the drawback and magnify the advantages. The performances improvement is directly related to the increment of the power consumption and of course to the power dissi- pation. More powerful amplifiers (multi-st

In last decades SAR (Synthetic Aperture Radar) antenna technology is fully oriented to the improvement of resolution and flex- ibility of the surveillance service. The civilian and military applications, more and more challenging, represent a continuous stimulus to better the satellite synthetic aperture radar technology spherically intended. The core of the SAR technology are the Transmitting and Receiving Modules, commonly named TRM, where the receiving and transmitting radio frequency chains are hosted into. The signal coming from and toward the Earth surface are processed and amplified by the integrated circuit mounted on the TR modules. This technology is normally known such as Hybrid Technology by exploiting different material and different sub-techniques in order to reduces the drawback and magnify the advantages. The performances improvement is directly related to the increment of the power consumption and of course to the power dissi- pation. More powerful amplifiers (multi-stage HPAs) have an higher dissipation and implies a proper thermal management. The common materials are not suitable to guarantee the correct functioning and they not ensure the capability to be compliant with standard derating rules. In this paper a fully coupled thermo-elastic problem relevant to a multi-materials hybrid modules will be proposed and discussed in order to suggest a different and innovative solution for high dissipative TR modules. The main topics will discuss the principal hypothesis to design a multi-material assembly where the thermal characteristics and thermo-elastic response plays a central role in the thermo-mechanical design. A preliminary theoretical investigation and a further numeral simulation campaign will be presented in order to suggest a possible methodology and the range of applicability of the proposed technology.