The purpose of this thesis was to design an antenna for 60 GHz Wi-Fi protocol 802.11 ad. Due to high loss at this frequency, highly directional, narrow beam antennas are required. Therefore, for WLAN applications where hemispherical coverage is required, a multi-antenna-element solution is required. In response to these requirements, a switchable waveguide structure was built by combining substrate integrated waveguide technology with controllable reflectors. Prototypes were designed and manufactured at 30 GHz to test this new technology. Prototypes included 1-way, 2-way and 4-way switchable waveguide variations. Measured results are in line with initial design targets and simulation results.