In era of ever increasing demand of wireless communications, domain of antenna design has progressed rapidly and gained a lot of attention among researchers and academicians. Over past few decades, it has catered the needs of society and technocrats by proving itself as one of the main driving forces behind recent advancements in wireless communication. Especially in the GNSS applications, for civilian and military use, antenna design has played a vital role. Thus, a humble attempt is made in this article to provide a glance of globally used antenna for the GNSS applications. A spiral antenna. Various aspects of antenna characteristics have been described that gives insight of developments carried out in the field of spiral antenna design and important conclusions are drawn from the comparisons made for their future use. Comparative reviews between various aspects of antenna designs reveal the fact about promising performance of spiral based antenna in developing dual/tri band applications for GPS as well as IRNSS.

Wireless networks are one of the best field for research unlike wired networks. In ad hoc wireless networks to evaluate the performance and behavior of various routing strategies & protocols, simulators are very good compromises between cost and complexities as well as accuracy of the results. Since there are many simulators available for ad hoc wireless networks, it is often difficult to decide which simulator to choose. The paper contains survey about simulators supporting in ad hoc wires networks. It aims to find a simulator which would help the researchers to develop and analyze various strategies and models in a reliable and easier way. We do not focus on the correlation of the individual simulation results, but try to compare the simulators from feature and usability point of view unlike other simulator comparison.

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