A Wide Bandwidth Microstrip Array Antenna with Inverted L-Shaped Slots

A wide bandwidth microstrip array antenna is proposed numerically and experimentally. By cutting an inverted slot in the patch and using the stacked structures, the impedance bandwidth of the presented antenna is broadened. In addition, the distance of elements of the array is properly settled and the coupling between the elements has been reduced effectively and the dimension of the array antenna is reduced by about 50%. Experimental and numerical result shows that the proposed array antenna, with compact size, has an impedance bandwidth range from 5.01GHz to 6.09GHz for voltage standing-wave ratio less than 2, which can meet the requirement of WLAN, WiMAX and C-band communication applications.