how to use nessus to protect the network

Hence, the same design can be used for frequencies in adjacent bands as well with minor changes in its dimensions. A thorough parametric study has been performed on the antenna and it has been found that the three bands can be tuned by varying certain dimensions of the antenna. Thus, together the two elements generate three resonant bands to cover WLAN, WiMAX and Bluetooth bands of operation. The presence of the parasitic resonator gives rise to two additional resonant bands at 2.3 GHz and 3.5 GHz. The parasitic resonator is placed on the other side of the substrate and is directly connected to the ground plane. The L-shaped element which is placed on top of the substrate is fed by a 50Ω microstrip feed line and is responsible for the generation of a wide band at 5.5 GHz. The antenna comprises of a L-shaped element which is coupled with a ground shorted parasitic resonator to generate three resonant modes for tri-band operation. Through a thorough discussion on its return loss and radiation plots as well as other parameters such as gain and radiation efficiency, it is proved that the it is a promising antenna for future cognitive radio systems.Ī novel and compact tri-band patch antenna for 2.4/5.2/5.8-GHz wireless local area network (WLAN), 2.3/3.5/5.5-GHz Worldwide Interoperability for Microwave Access (WiMAX) and Bluetooth applications is proposed and studied in this paper. The performance of a new fractal antenna design which generates four bands of operation in the range of 900-4000 MHz has also been studied. This papers investigates the use of multiband fractal antennas for spectrum sensing application in cognitive radio units. A special antenna is required in cognitive radio for sensing and communication purposes. Research on antenna design is very critical for the implementation of cognitive radio.

The concept of Cognitive radio is envisaged to be a paradigm of new methodologies for achieving performance enhanced radio communication system through an efficient utilization of available spectrum. Rapid development in wireless communication systems and an increase in the number of users of wireless devices is bound to result in spectrum shortage in the near future.

How to use nessus to protect the network