Design and Analysis of a Frequency Reconfigurable Antenna for Ultra wide band and Cognitive Radio Applications

摘要

Nowadays, ultra wide band antennas gain a lot of attention as it is an alternative to a number of narrow band antennas for a variety of applications. Whereas, reconfigurable antennas allow themselves to reconfigure in terms of frequency, polarization or pattern to perform a multitude of functions. This paper attempts to design an ultra wide band rectangular patch antenna for sensing the spectrum. The same design has also been used as a frequency reconfigurable antenna for narrow band coverage within the ultra wide band. The frequency reconfiguration could be realized using the various switching configurations of a few parasitic elements associated with the antenna. This antenna structure provides an operable range of frequencies from 3.14 to 10.6 GHz that makes the antenna suitable for ultra wide band and cognitive radio front end applications. The tool used for simulating the design is Ansoft High Frequency Structure Simulator (HFSS) software.