Lumped Element Capacitor Based Two-Dimensional Efficient Metamaterial-inspired Electrically-Small Antenna

Easy to build, efficient and electrically-small antenna designs are presented which are based on a two-dimensional (2D) metamaterial-inspired structure that incorporates a lumped element capacitor in its design and that is driven by an electrically-small rectangular semi-loop antenna fed by a coaxial cable through a finite PEC ground plane. Measured reflection coefficients showed a very good agreement with the simulated data, where the measured resonant frequency is only 0.7% below the numerically predicted value. The proposed lumped capacitor based 2D antenna systems are scalable to a desired frequency and predicted radiation characteristics of the antenna systems at 100 MHz, 450 MHz and 1575 MHz are reported.