Design of electrically small Yagi antenna

A two-element electrically small Yagi antenna is presented. The antenna is composed of a spiral-shaped driver and a director. To step up the low radiation resistance due to the small element size and close element spacing, multiple folded arms are used on the driver element. The design has been optimised, built and measured. The total volume of the antenna is 0.065lambdatimes0.095lambdatimes0.095lambda and the measured realised gain toward the director direction is 8.81 dB