RESEARCH AND DEVELOPMENTS OF MICROWAVE HEATING SYSTEM FOR SOLDERING FINE CIRCUITS

提出了利用逝去波焊接精密电路的微波加热系统。逝去波对微波局部加热非常有用。该加热系统由一个匹配电路和一个谐振器组成，用来增强圆波导口周围的磁场，在圆波导口激发出强烈的逝去波。用微波对无铅焊料进行了加热实验，微波频率2.3~2.35 GHz，功率约200W。无铅焊料可以局部加热，用微波熔化，而不会在谐振器中击穿。

The microwave heating system using evanescent wave for soldering fine circuits had been proposed. The evanescent wave is useful for the microwave heating very locally. The heating system consists of a matching circuit and a resonator for enhancing the magnetic field around the mouth of a circular waveguide in which the strong evanescent waves are excited. The experiments of heating lead-free solders have been done with the microwave at a frequency of 2.3-2.35GHz and a power of about 200W. The lead-free solder can be heated locally to be melted with microwave without any breakdown in the resonator.