Full-Wave Analysis of Loaded Dipole Antennas using Mode-Matching Theory

The influence of the material inclusions on the input impedance of the loaded dipoles excited by a delta function is analytically investigated. Novel and accurate analytical expressions for the input impedance of the loaded dipoles are proposed based on the mode matching technique. The boundary conditions are also enforced to obtain several simultaneous equations for the discrete modal coefficients inside the radiating region. Study of the input impedance of the whole multilayered structure is accomplished by the cascade connection of mediums as characterized by their constitutive parameters. The derived formulas are successfully validated through a proper comparison with the results obtained with the commercial software CST Microwave Studio.