“…To overcome these limitations, lots of designed antennas are proposed such as a U-shaped slotted patch [4], a triangular patch [5], a circular patch [6], rectangular patch [7], irregular diamond, edge slotted patch [8], etc. Antenna designs with circular slots on microstrip patches to obtain wideband are also proposed [9][10][11]. Furthermore, different substrate materials and different feeding techniques are also applied [12,13].…”