Illustration (IMAGE) University of Gothenburg Caption The following illustration shows how the microwave signal jumps from about 10 GHz to 14 GHz and then to 20 GHz when the current is increased. Credit Johan Åkerman/The University of Gothenburg Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.