Dual-Feed Wideband Folded Waveguide Antenna for Handset Devices

This paper presents a dual-feed wideband folded waveguide antenna for handset devices. The proposed antenna can be implemented into devices with seamless metallic back cavity and it radiates through an open slot realized on the front by the corner edges of the display module and the main frame of the device. As a novel way of utilizing antenna cluster technique, an extra feed is added while the phase is adjusted for different operating frequencies. In order to prove the concept, a dual-feed folded waveguide antenna is designed for WiFi applications. The radiation efficiency of the proposed antenna remains higher than -6 dB within the frequency ranges of both 2.19-3.09 GHz and 4.73-6.44 GHz. The proposed antenna exhibits a wideband behavior. It achieves fractional bandwidths of 36% and 31% at 2.50 GHz and 5.50 GHz, respectively. Besides, the directivity is less than 5.5 dBi at both 2.50 GHz and 5.50 GHz.