During the war, radar technology is the crucial technique for troops to detect where enemy is. That is to say, in order to give the allies an edge, scientists developed radar technology to "see" for hundreds of miles, even at night. The research that went into improving radar arouses the stage for post-war research into the transistor such as RF transistor.
In 1940, radar relied on a semiconductor crystal, or "rectifier," to send out a radio wave and analyzing the reflected wave after it bounced off any objects in the air. The rectifier's job was to translate the reflected signal into the direct current necessary for visualization on the screen. Nevertheless, these crystals often couldn't handle the quickness and intensity of a rapidly changing radar signal. They would burn out frequently.
Finally, after trying different semiconductors and doping with different materials, researchers learned which combinations produced the best results and also learned new techniques on how best to grow and dope the crystals. That was when transistor like RF transistor had been found on that day.
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