| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 98 === This thesis presents the convergence study on the simulation of low frequency antennas with buried radial wires when the method of moments is applied. The region of convergence of the segment length against antenna efficiency is studied for low frequency monopole antenna with buried radial wire, first. By constructing the region of convergence, a suitable segment length can be determined. In order to validate the region of the convergence, the ground loss calculations of the buried radial wires with soil from the NEC-4 software and theoretical derivation are compared. Finally, the convergence of region is first derived to study the umbrella type of the top-loaded monopole (TLM) antenna with buried radial wires. The characteristics of the umbrella TLM antenna are then studied parametrically by changing the length and number of the buried wires, the length of the incline radiator, the electric parameters of the soil, and the number of the supporting guys. An optimal specification of the low frequency umbrella TLM antenna with buried radials is then suggested.
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