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Analysis of axial-mode helix without a ground plane

The version of helical antenna in which the ground plane is replaced by an adjacent loop and two parasitic loops (HAWGP) is investigated. The dimensions of the structure are optimized to give maximum front to back ratio in the field pattern. The numerical results are compared with that of the balanced helical (BH) antenna. Using the moment method, the current distribution along the antenna is determined. The radiation characteristics are calculated on the basis of the obtained current distribution. Also, the frequency response of the input impedance, axial ratio, and power gain are investigated.