The SIW Cavity Backed Tunable Planar Antenna

A substrate integrated waveguide cavity backed active slot antenna is presented in this paper. The antenna operating frequency band is tuned by varying the capacitance of the three varactor diodes connected across the radiating slot. The overall dimensions of the fabricated antenna prototype are 29.6×34.8×0.508 mm ³ . The tuning process does not change the antenna radiation pattern.