A Novel Design of Rectangular Microstrip Antenna by Multiple Slot Loading

A novel design of conventional rectangular microstrip antenna with a modification in the patch by adding three and four vertical slots is presented. Without slot loading there is only one frequency band with antenna resonating at 4.125 GHz and bandwidth of 1.56 % with a return loss of -23.0191 dB. With four slots three bands occur with a maximum bandwidth of 6.9 %. When one of the slots is removed the antenna resonates with four bands and maximum percentage bandwidth of 18.4 %.