一、向毫米波段发展的必要性有人预测,到1995年,全世界将需要发射约200颗商用通信卫星。目前,地球同步轨道位置十分拥挤,分配给美国和加拿大的轨道段已被占满。因此,轨道位置饱和及电波干扰已成为一个急待解决的问题。近年来,许多国家和私营公司正在积极筹建国内卫星通信和电视广 The Necessity of Developing to the Millimeter Wave Band It is predicted that by 1995 the world will need to launch about 200 commercial communication satellites. At present, geostationary orbits are crowded and the orbital segments allocated to the United States and Canada have been filled. Therefore, the orbital position saturation and radio interference has become an urgent problem to be solved. In recent years, many countries and private companies are actively preparing for domestic satellite communications and television broadcasting