Determination of Far-Field Pattern Expressions for Helical Antenna Analyzed Using Curved Segments Moment Method

Abstract

The use of moment method with curved segments for numerically modeling helical antennas has been the scope of many papers, it is mainly used to solve for the current distribution on the helix contour with high accuracy at a reduced number of segments. It is often very challenging to use the resulting electrical current distribution to evaluate the far field expressions. This paper is intended to cover the development of the far field expressions for a helix antenna analyzed using moment method under curved basis and testing functions. The electric field is expressed in unified expressions based on the antenna current distribution. The validity of the obtained expressions is verified through the analysis of commonly known operation modes by choosing different geometries for the Helical Antenna.