DefinePK

Abstract

Antennas play an important role in any wireless communications. Some of them are patch Antennas, parabolic reflectors, and Slot Antennas and Folded Dipole antennas. Each type of antenna is good in their own properties and their applications. The current trend in commercial communication systems has been to develop low cost, minimal weight, low profile antennas that are capable of maintaining high performance over spectrum of frequencies. This technological trend has focused much effort into the design of microstrip antennas. With the simply geometry, these antennas offer many advantages which are not commonly exhibited in other antenna configurations. The software defined radio is a radio in which all of their functions are defined automatically. Radio is a device which can transmit or receive signals only in the radio frequency. The use of software defined radio (SDR) is to make communications more flexible, by making communications reconfigurable at lower layers of the networking. The major challenge is to design small antennas which can be operated at different number of frequency bands. For this frequency reconfigurable antennas need to be designed in which frequency can be tuned so, a single antenna can able to operate at different frequency bands.