Casimir Ehrenborg

TL;DR: This paper presents a tutorial description of antenna current optimization, a tool that offers many possibilities in antenna technology to optimize the antenna current for strip dipoles and planar rectangles and codes and numerical results for maximization of the gain to Q-factor quotient and minimization for prescribed radiated fields.

TL;DR: The obstacles in defining and calculating stored energy in general electromagnetic systems are presented from first principles as well as using demonstrative examples from electrostatics, circuits, and radiating systems to formalize such challenges.

TL;DR: The concept of unobservable energy is introduced to formalize such challenges in this paper, and the existing methods of defining stored energy in radiating systems are reviewed in a framework based on technical commonalities rather than chronological order.

TL;DR: A body area network for measuring an electrocardiogram (ECG) signal and transmitting it to a smartphone via Bluetooth for data analysis and the built-in communications can be used to raise an alarm if a heart attack is detected.

TL;DR: Results show that optimized planar meander line antennas meet the lower bound on the radiation quality factor (Q-factor) (maximizing single-resonance fractional bandwidth) but are far from reaching the associated physical bounds for efficiency.