I always wanted an antenna in my head

Haven't readers of science fiction always liked the idea of having an implanted antenna in their head?  Science makes it possibly closer:

Engineers have figured out how to make antennas for wireless communication 100 times smaller than their current size, an advance that could lead to tiny brain implants, micro–medical devices, or phones you can wear on your finger....

The team created two kinds of acoustic antennas. One has a circular membrane, which works for frequencies in the gigahertz range, including those for WiFi. The other has a rectangular membrane, suitable for megahertz frequencies used for TV and radio. Each is less than a millimeter across, and both can be manufactured together on a single chip. When researchers tested one of the antennas in a specially insulated room, they found that compared to a conventional ring antenna of the same size, it sent and received 2.5 gigahertz signals about 100,000 times more efficiently, they report today in Nature Communications.

“This work has brought the original concept one big step closer to reality,” says Y. Ethan Wang, an electrical engineer at the University of California, Los Angeles, who helped develop the idea, but did not work on the new study. Rudy Diaz, an electrical engineer at Arizona State University in Tempe, likes the concept and execution, but he suspects that in a consumer device or inside the body the antennas will give off too much heat because of their high energy density. Wang notes that the acoustic antennas are tricky to manufacture, and in many cases larger conventional antennas will do just fine.

Still, Sun is pursuing practical applications. Tiny antennas could reduce the size of cellphones, shrink satellites, connect tiny objects to the so-called internet of things, or be swallowed or implanted for medical monitoring or personal identification. He’s shrinking kilohertz-frequency antennas—good for communicating through the ground or water—from cables thousands of meters long to palm-sized devices. Such antennas could link people on Earth’s surface to submarines or miners. With a neurosurgeon at Massachusetts General Hospital, he’s also creating brain implants for reading or controlling neural activity—helpful for diagnosing and treating people with epilepsy, or eventually for building those sci-fi brain-computer interfaces.