International Journal of Research in Science & Technology

6

Authors: S. Gowri Shankar, K. Viswavardhan Reddy and K. Vishnuvardhana Reddy

Horn antennas are widely used antennas in satellite applications mainly because of their physical robustness and capability to operate at high frequencies. In this work an attempt has been made to design a pyramidal horn antenna along with associated waveguide to operate in X-Ku band (9.5 to 14.5 GHz). The design was simulated using High Frequency Structure Simulator (HFSS). HFSS is a widely used tool when it comes to design and simulation of any antenna system. Initially by using design formulas, the dimensions of the horn structure and waveguides are found and then they are fed into HFSS to simulate in the mentioned frequency band. The performance parameters like return loss, radiation pattern, directivity and cross-pol isolation were considered for the simulation. Finally, with this design we will be able to reduce the operation costs in launching any communication satellites for broadcasts.

8

Authors: Y.N.Raghunath babu

It evaluates the performance of prominent on demand routing protocols, which are Ad Hoc On –Demand Distance vector Routing(AODV),Dynamic Source Routing(DSR)for wireless sensor networks Results obtained from simulations demonstrates that even though AODV and DSR share a similar on demand behavior, the differences in protocol mechanics can lead to significant performance differentials. The performance differentials are analyzed using varying network load and network size using PHENOM ATTRIBUTES NS-2 is used as a platform for simulatingAODV&DSR under various conditions.PHENOM routing protocol is designed especially for wireless sensor networks. Wireless Sensor Networks (WSNs) are characterized by multi-hop wireless connectivity, frequently changing network topology and need for efficient routing protocols.