A Planar Dualband Antenna for 2.4 GHz and UWB Laptop Applications

This paper presents a planar embedded dualband antenna for the 2.4 GHz wireless local area network (WLAN) and ultra-wideband (UWB) applications. A partial elliptic with a rectangle tail on the front side of a PCB forms the planar antenna for the UWB applications (3.1-10.6 GHz). The smooth change in the feed of the antenna achieves a good impedance match between the feed cable and the antenna. A strip on the back side of the PCB connected to the front side with a metal strip on the side or via through the PCB produces a resonance for the 2.4 GHz WLAN or Bluetooth (BT) application. The proposed antenna was simulated assuming free-space conditions, and fabricated onto a piece of a thin PCB. Both the impedance and radiation performance of the antenna embedded into the display of a laptop computer were experimentally measured and then optimized. The measurement shows that the proposed antenna is capable of providing a good impedance match and acceptable gain across the 2.4-2.5 GHz WLAN/BT band and the 3.1 -10.6 GHz UWB band. Furthermore, this antenna features a low profile and low cost solution, and can be readily embedded into the thin covers of laptop computers or other portable devices.