A triple-band highly miniaturized antenna for WiMAX/WLAN applications

Abstract

A novel highly miniaturized triple band antenna for WiMAX and WLAN applications is presented in this letter. The proposed design has an active patch area of only 108 mm2 (9 × 12 mm2), and operates at 2.5 (lower WiMAX), 3.47 (middle WiMAX) and 5.75 GHz (WLAN), respectively. Miniaturization in the proposed design is accomplished by etching 2 novel cascaded E-type unit cell defected ground structure in conjunction with the F-shaped slot, and multiband operations are achieved by etching U and H-type slots in the radiating monopole. The miniaturization process leads to the reduction of about 82.4% and 73.5% in the active patch area and volume of the proposed antenna respectively, as compared with the conventional designed triple band antenna. The antenna has a compact volume of 0.15 λ0 × 0.15 λ0 × 0.01 λ0 at a lower resonance of 2.6 GHz. The proposed structure has S11