Ⅰ、绪言在接收卫星通信这样微弱的电波时,必须尽可能地减少波导回路的损耗。在使用波导的初始阶段,对波导材料、加工方法、内壁伤痕以及电镀等作了研究。最近,汽车排出的气体、工场地区所产生的各种有害气体等等而引起设备的污染都不能忽视。因此,无论是室内还是室外使用的设备都要采取措施,尤其是在要求长期稳定性的情况下更是如此。为了抑制波导内壁腐蚀而引起的微波损耗的增加,向来都对波导作了种种考虑。例如,波导内壁的电解研磨、化学研磨、电镀等等, I. INTRODUCTION When receiving such weak radio waves as satellite communications, it is essential to minimize waveguide loop losses. In the initial stage of the waveguide, the waveguide materials, processing methods, inner wall flaws and plating were studied. Recently, the gas emitted by automobiles, various harmful gases generated in the work area, etc., can not be ignored due to the pollution of equipment. Therefore, measures should be taken for both indoor and outdoor use of equipment, especially where long-term stability is required. In order to restrain the erosion of the inner wall of the waveguide caused by the increase of the microwave loss, the waveguide has always made various considerations. For example, electrolytic polishing of inner walls of waveguides, chemical polishing, electroplating and the like,