The first semiconductors capable of functioning as radio frequency power amplifiers date back to the 1950s. During this time, germanium transistors were developed that could operate at low power levels in the VHF and UHF bands. However, efficiencies were poor and reliability was a major issue. In the 1960s, the introduction of silicon transistors led to significant improvements in power handling capability and reliability. Additional refinements to transistor designs allowed output powers to reach levels useful for citizen's band radios and low-power broadcast applications through the 1960s and 70s. Get More Insights On Rf Power Semiconductor https://articlescad.com/the-rising-demand-for-advanced-rf-power-semiconductors-85069.html