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Dual-band Antennas with Multifunctional Beam for DCS/WLAN Applications

A novel technique to achieve dual-band antenna with multifunctional beam is presented in this paper. Based on this technique, two different dual-band antennas; a Dielectric Resonator Antenna (DRA) and a microstrip antenna are proposed and their performances are compared. Each of these antenna configurations contain two radiating elements fed by single port dual coupling mechanism. The proposed antennas operate over DCS-1800 and WLAN bands. Both the antennas exhibit a bidirectional pattern with the beams oriented along +Z and -Z directions with the antennas placed in XY plane. DRA shows peak radiation efficiency of 93.47% and 97.38% within DCS and WLAN bands. Microstrip antenna shows peak radiation efficiency of 72.17% and 66.80% within the associated bands respectively. Dual-band characteristics along with oppositely oriented beam of the proposed antennas enable them to operate simultaneously in DCS and WLAN bands with minimum interference between radiating elements.