International Journal of Microwave and Optical Technology (IJMOT)
A new miniaturized Koch fractal hybrid coupler is proposed using Koch fractal curve. In order to validate the results, the miniaturized Koch fractal hybrid coupler is designed, fabricated and measured using microstrip transmission line at operating frequency 2.44GHz. The measured results verify the phase difference between two output ports. Also it has effectively improved bandwidth of the return loss and isolation. Furthermore size of the conventional hybrid coupler is reduced while keeping the performance unchanged. Experimental results also show good consistent with the simulation results. This Koch fractal hybrid coupler can be used for IEEE 802.11b/g WLAN and Bluetooth wireless applications.