Abstract
The input impedance of a thin cylindrical wire antenna kept horizontally above a lossy earth (modeled as a half-space) is calculated by solving the electric field integral equation for the antenna current using the method of moments (MoM). Coupled horizontal wire antennas kept at the same height from the air-earth interface are analyzed by solving the corresponding zero and first phase sequence current integral equations. Mutual impedance results for broadside and collinear configurations are presented. The earlier used MoM solution is used to calculate the input impedance of a horizontal wire antenna above a two-layered earth. This investigation is useful to determine the sensitivity of the antenna impedance to the changes arising from subsurface anomalies. The Sommerfeld-type integrals encountered in these analyses are evaluated by an accurate Gaussian integration method.
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