A dual broadband dual slot antenna

In this paper, two types of the slot antenna were designed, fabricated, and measured. We used several technical methods to perform the impedance characteristics, control the operating frequency of resonances, enhance the impedance bandwidth at the resonances and miniaturize the size of the microstrip-fed slot antenna at the 2.4 GHz and 5 GHz (the industrial-scientific-medical (ISM) bands and the Hiperlan2) bands. The slot antenna was fabricated by changing the radiation element from the rectangular slot to the Z-like slot, adding four symmetrical tuning stubs at the slot edges, and splitting the slot into a double slot. The obtained impedance bandwidths for two operating bands can reach about 16.07 % for the 2.4 GHz band and 20.59 % for the 5 GHz band. The simulated and the measured radiation patterns of the double Z-like slot antenna were shown.