The spot-brazing joints interconnect techniques between gold ribbon and composite substrate by using micro-gap welding

Due to the material and assembling process characteristics, once the failure of the soft interconnects could induce total lost. This paper mainly focuses on the conversion of the coaxial-connector to microstrip, a new and reliable method was presented by the high-frequency simulation HFSS and investigated on the module samples, which can effectively prevent the problem of substrate fracture. The results show that the micro-resistance spot-brazing of gold microstrip-coaxial conversion was verified as the optimum design through introducing the Au-Sn solder welding process, which ensures the reliability of the microstrip-gold ribbon joint. The Au-Sn brazing filler shows a well-wettability microstructure, and the IMC compound with a double-layer structure and generated non crack at the interface of the welded joint. And the insertion loss of this brazing joint gold-coated strip was tested to be less than 0.2 dB in the bandwidth of DC~10 GHz. The spot-brazing transition was significantly extended the flexible interconnection methods to the aerospace product.