"Gallium Nitride: This is the material used to build the radar's powerful new circuits. It is a powerful semiconductor that uses energy efficiently to amplify the radar's high-power radio frequencies. Raytheon has spent more than 15 years and $200 million pioneering gallium nitride technology, and has built gallium nitride circuits for a number of products including jammers and other radars." http://www.raytheon.com/news/feature/power_patriot.html
功率半導體開發很花錢與時間~
下一代的功率半導體是SiC做為基板的GaN (GaN on SiC)... 沒記錯的話,SiC基板可以耐高熱,用在引擎裏面的感測器材料...