Demonstration of Radiation Efficiency Improvement of a Miniature Narrow Band Antenna

This paper investigates two ways to improve the radiation efficiency of an electrically small antenna loaded by a capacitor. The first one consists in enlarging the antenna strip width in order to lower its loss resistance. The second one focus on optimizing the loading capacitor used to lower the resonant frequency by mixing a discrete and a coplanar twin strip capacitors. The two studied parameters have a strong impact on the radiation efficiency as the antenna is electrically small.