"You can always improve signal quality by using a larger antenna, but that's simply not practical for many wavelengths," says Jacob Adams, an assistant professor of electrical engineering at NC State University and senior author of a paper on the work. "For example, antennas operating in the high frequency range -- 3 to 30 megahertz (MHz) -- would be 5 meters long or longer. We've shown that DAM can improve signal quality dramatically when using much smaller antennas. How much smaller can vary, but we've demonstrated the concept using antennas one-third the size of a conventional antenna for a given wavelength."
The DAM concept has been around for more than 50 years, and is essentially the idea that storing and releasing energy from the antenna at the right moments can reduce the amount of distortion in the resulting signal. However, researchers had not previously done a thorough comparison of conventional antennas to DAM antennas when transmitting at high frequencies.
Adams - Team - Antennas
Adams and his team used antennas that were just under 1...
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