Optimization of Choke Antenna Aperture Radiation Pattern

Abstract

This paper discusses a simple choke antenna composed mainly of a circular waveguide surrounded by a choke. An analytical model that plots field patterns and currents of the choke is presented. Also, this model can obtain the total amplitude and phase of antenna far-field radiation characteristics to get the desired gain, half-power beamwidth, or radiation maxima direction for applications such radar systems and satellite communications. A comparison in CPU time between this model and the finite element method is introduced. At a selected operating frequency of 2.45 GHz, finite element method solver Ansys HFSS is utilized to validate the resulting radiation patterns of the proposed analytical model and to export the choke currents.