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DESIGN OF OPTIMAL GROUND CONDUCTOR FOR THE HELICAL ANTENNA

We have observed that the size and shape of the ground conductor of axial mode helical antennas have significant impact on the antenna gain. Of all the shapes considered, the ground conductors in the shape of truncated cone yield the highest increase in the antenna gain when compared to the antennas above the infinite ground plane. We have designed the optimal ground conductor for the specific helical antenna by optimizing the geometrical parameters of the truncated cone with the goal to maximize the antenna gain. The results are compared with the results and measurements reported in our previous work.