🗊Презентация Half-Wavelength Dipole Antenna

Half-Wavelength Dipole Antenna

Simulation Geometry and Setup

Antenna Reciprocity To demonstrate reciprocity, two studies are performed. In Study 1, a voltage is applied to the Lumped Port, similar to the dipole antenna model discussed in https://www.comsol.com/model/dipole-antenna-8715. In Study 2, the Lumped Port excitation is turned off, and a background field study is used, similar to the model discussed in https://www.comsol.com/model/detecting-orientation-of-a-metallic-cylinder-embedded-in-a-dielectric-shell-19871. The gain and antenna impedance from Study 1 are used to calculate the power this antenna would receive if it was illuminated with a 1 V/m plane wave in (1,0,0). Study 2 directly calculates the power received when illuminated with a 1 V/m plane wave in (1,0,0). Both methods return 2.6 μW.

Comparison with Theory Theory used is for a infinitely thin antenna, found in any standard antenna text. Maximum directivity is 1.64 Impedance is ≈ 73 Ω Note that real antenna parameters vary substantially with finite antenna radius, and the geometry here was intentionally chosen to be close the theoretical results. Simulated impedance is 73 + 3j Ω This agrees well with published values http://ieeexplore.ieee.org/document/1696826/