Double-Choke Antenna Radiation Optimization

This paper discusses the benefit of adding a second choke to a choke antenna. An analytical model that obtains the antenna far-field radiation components is developed. This model proves the advantage in using a second choke which introduces further phase delay in the formed complex currents. Therefore, the desired half power beamwidth (HPBW) or radiation maxima direction can be achieved with smaller antenna size. Analytical model validation is conducted using finite element method solver Ansys HFSS. Finally, the processing time of the analytical model and FEM simulation is shown and compared in CPU time.