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The use of directional antennas in wireless ad-hoc and sensor networks is gaining immense popularity due to its features such as increased coverage range, security, enhanced throughput and energy efficiency. Only a few simulators such as Network Simulator 2 (NS2), NS3 and Qualnet are currently providing directional antenna support. Recently, a directional antenna model has been implemented in Cooja...
In this paper, we propose a pattern reconfigurable microstrip antenna with improved beam scanning range. The antenna is a Yagi-Uda structure with center square shaped driven patch and two hexagonal slotted tunable parasitic patches placed on each side of the driven element. The radiation properties of parasitic patches are changed by varying the capacitance of varactor diodes loaded in hexagonal slot...
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