Abstract :
Radar is 30 years old this year, and, to a young man starting on a career, would seem to be an old invention. He could perhaps be excused for concluding that it had little potential left for future development because the whole microwave band useful to radar has now been opened up and the inverse range to the fourth-power detection law is no longer a major embarrassment because of the advent of various types of high-power transmitting tube and low-noise receiver.
