Fluid Switch for Radiation Pattern Reconfigurable Antenna

This work presents a conductive fluid switch design, which is applied to a 3-element Yagi-Uda antenna operating at 433MHz industrial scientific medical (ISM) band. The directivity of the antenna is re-configurable by controlling the conduction state of the fluid switchs. 3D printing technology is used to fabricate the two parasitic elements. A microcontroller and a pump system are used to control the fluid level in the switch.