Slot Based Microstrip Antennas for Dual Band WLAN Applications

Abstract

The field of mobile and wireless communication is growing at very fast rate covering many technical areas. Wireless local area network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) technology is most rapidly growing area in the modern wireless communication. This gives users the mobility to move around within a broad coverage area and still be connected to the network. This provides greatly increased freedom and flexibility. For the home user, wireless has become popular due to ease of installation, and location freedom. Among wireless devices antenna is quite important component. So, there is continuously increasing requirements of efficient and high performance antenna. The features of antenna which every technology requires are light weight, small in size and low cost etc. Another important desired properties of antenna are wide bandwidth and resonant at multiple frequency. Next Generation devices have also more than one application embedded in single device so antenna supporting more than one band is required and multiband operation of antenna is another challenge. Almost all these requirements can be fulfilled by Microstrip patch antenna.

The main objective of this report is to design Coaxial Fed Dual band Microstrip antennas for WLAN applications using three different shapes of patch that are rectangular, triangular and pentagonal. The designed antennas resonate at two frequencies 2.4GHz and 5.2GHz. The bandwidth is also increased upto a sufficient level by having slots in the patches. The various parameters like return loss, smith chart, gain, radiation pattern and bandwidth have been studied and plotted for each simulated antenna. The parametric study of each of the designed antenna is also done. The simulated results of the effect of the various parameters like length of the patch, location of the feed point and position of the slot are also shown.