Evaluation of Electromagnetic Modeling Tools, January 2009
Modeling the Dipole as a Round Wire or Flat Ribbon Modeling a Center-driven Dipole with HFSS
The round wire can be approximated by a narrow, flat ribbon. The flat ribbon
has the same length, zero thickness, and an equivalent width.
The relationship between the equivalent width
The input impedances of the two models, 0.5-mm round wire and 2-mm wide flat ribbon, are almost the same over the frequency range evaluated. Also, we compared the results in the following table.
Depending on the radius of the wire, the length of the dipole for the first resonance is about L = 0.47 to 0.48 wavelengths [1]. For a 1-m dipole, the first resonance frequency should be between 141 MHz and 144 MHz. Using the flat ribbon model, both the input impedance and the resonance frequency are close to the theoretical values. Reference: [1] C. Balanis, |