Miniaturization of cavity-backed crossed-slot antenna using folded cavity

A technique for miniaturization of a cavity-backed crossed-slot antenna is presented. A conventional cavity-backed crossed-slot antenna is a square half guided-wavelength on a side. The proposed technique reduces the size of the cavity by folding each side. By folding the cavity, the guided length inside the cavity can be increased. The size of a cavity-backed crossed-slot antenna using proposed technique operating at 2.45 GHz is 26 mm × 26 mm. Compared to the conventional cavity-backed slot antenna, which has a size of 60 × 60 mm, more than 81.2 % size reduction is achieved with proposed technique.