Slot embedded dual-band patch antenna for WLAN and WiMAX applications

A dual-band, singly fed slotted microstrip antenna for the 2.4 GHz wireless local area network (WLAN) and 2.5/3.5 GHz worldwide interoperability for microwave access (WiMAX) is implemented. The antenna consists of an aperture-fed square patch embedded with a narrow and symmetrical π-shaped slot to generate dual-band resonance. The geometry resonates at a lower frequency band which fully covers the 2.4-2.484 GHz WLAN band and 2.5-2.69 GHz WiMAX band. The higher-frequency resonance is obtained in the 3.5 GHz WiMAX band. An oval-shaped stub at the open end of the single microstrip feed line is used to obtain impedance matching over a wide band of frequencies. The 10 dB return loss bandwidth measured for the antenna is 18.07 and 8.28% in the lower and upper bands, respectively. Reactive loading of the patch with the π-shaped slot has resulted in a reduction of patch size by 36% when compared with a traditional square patch resonating at an operating frequency of 2.4 GHz.