Folded Waveguide Antenna for Handset Devices

This paper presents a dual-band folded waveguide antenna for handset devices. The proposed antenna performs a three dimensional miniaturized design. In comparison with the conventional waveguide antenna, it merely occupies 25% of the area while the radiation efficiency of the antenna is kept at the same level. Besides, the proposed antenna can be implemented into the devices having a metallic cavity and radiates through a narrow slot realized on the corner of the structure. The antenna can be placed under the display module neither requiring cuttings on the main frame nor rearranging the existing components. For proving the concept, a folded waveguide antenna operating at both 2.40-2.50 GHz and 5.15-5.85 GHz for WiFi applications is designed. When taking into account the major components of the handset device, the proposed antenna achieves radiation efficiencies of -2.20 dB and -1.84 dB at 2.45 GHz and 5.50 GHz, respectively.