Due to the recent interest in broadband antennas a microstrip patch antenna wasdeveloped to meet the need for a cheap, low profile, broadband antenna. This antennacould be used in a wide range of applications such as in the communications industry forcell phones or satellite communication. Particle Swarm Optimization was used to designthe dual-linear polarization broadband microstrip antenna and impedance matchingnetwork. This optimization method greatly reduced the time needed to find viableantenna parameters. A dual input patch antenna with over 30% bandwidth in the X-bandwas simulated using Ansoft's High Frequency Structural Simulator (HFSS) inconjunction with Particle Swarm Optimization. A single input and a dual input antennawas then fabricated. The fabricated antennas were composed of stacked microstrippatches over a set of bowtie apertures in the ground plane that were perpendicular to oneanother. A dual offset microstrip feedline was used to feed the aperture. Two differentlayers were used for the microstrip feedline of each polarization. The resulting measuredimpedance bandwidth was even wider than predicted. The antenna pattern was measuredat several frequencies over the antenna bandwidth and was found to have good gain,consistent antenna patterns and low cross polarization.
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