The more recent US hegemony in radio communications technology was held by pioneering Bell Labs work leading to patented implementation as 3G standards. I think

The more recent US hegemony in radio communications technology was held by pioneering Bell Labs work leading to patented implementation as 3G standards. I think the US rested on the laurels of those patents for too long. Microwave RF basebands were not too long ago considered advanced as alien technology. Now China has re-developed them on their own terms.