Abstract
Matrix methods used with the Method of moments are used to analyse and calculate antenna parameters for a thin wire antenna. FORTRAN and MATLAB programs are written to execute this method, to present and describe the analysis of the electromagnetic behaviour of thin wire antenna. The FORTRAN programs are written just as executed in a sequel report, and converted to a MATLAB program. A given problem in wire antenna can involve several wires of different radii that can be excited or loaded at any point along their lengths. The current distribution, near field and far field patterns are computed for the radiation program, while the current distribution along with specified scattered field patterns are computed for the scattering program. The number of subsections used in calculating the current distribution for the radiation problem was increased to give a better approximation of the wire’s current distribution. Emphasis are given to the required data input. Noting that the programs presented cannot be used for all general examples of wire antenna.
AI Summary
This undergraduate thesis applies the Method of Moments to the electromagnetic analysis of thin-wire antennas and scatterers, using Galerkin’s method with piecewise-linear triangular basis functions to solve for wire current distributions through the generalized impedance-matrix formulation. It reviews and reproduces earlier FORTRAN programs for radiation and scattering problems, then converts the implementation to MATLAB so the same antenna quantities can be calculated in a more flexible computing environment. The radiation model calculates current distribution and radiated-field behavior, while the scattering model evaluates induced current and scattered fields for different incident-wave directions; the MATLAB results closely match the original FORTRAN outputs in the reported test cases. The MATLAB radiation code is then extended beyond the original 25-subsection limit to 50 subsections, increasing the number of triangular expansions and producing a smoother, more refined approximation of the current distribution. The work demonstrates that established thin-wire Method-of-Moments formulations can be preserved while modernizing the implementation and improving numerical resolution, and it identifies broader, less rigid implementations for more general wire configurations as a natural direction for future work.