Directivity enhancement of a dual-band antenna based on Partially Reflective Surface

Wireless Local Area Networks (WLAN) are being widely recognized as a viable, cost effective and high-speed data connectivity solution, enabling user mobility. The rapid developments in WLAN technologies demand the integration of IEEE 802.11b and IEEE 802.11a WLAN standards of the 2.4 GHz (2400-2484 MHz), 5.2 GHz (5150-5850 MHz) bands into a single unit. To comply with the above requirements, compact high performance multiband antennas with excellent radiation characteristics are required. A second requirement for WLAN applications could be directivity, which can be achieved by making use of high-directive antenna methods. This paper presents a new type of dual band and high directive planar antenna operating at frequency 2.4/5.5 GHz. The source antenna is achieved based on the principles of dipole planar structures and coupling microstrip feed lines. A PRS (Partially Reflective Surface) will add another layer to the structure. This surface is working as a lens to shrink our source antenna's pattern and allows to have a dual band high directive antenna.