Multiband double layered microstrip antenna by proximity coupling for wireless applications

The demand on higher data rate in modern communication systems leads to the use of multiband applications. A multiband double layered microstrip antenna is designed for this purpose. The patches are shaped through variation of the widths and lengths of tri-slots to achieve reflection minima at 3.1 GHz, 5.8 GHz, 7.4 GHz and 9.8 GHz, which cover many applications such as WiMAX, Wi-Fi or other wireless applications. The patches are fed by proximity couplings for bandwidth enhancement. The simulation results of the reflection factor are compared by measurements. The measurements verified the theoretical approach.