# IEROS

1D Antenna Analysis

## Overview

IEROS software allows the analysis of antennas with symmetry of revolution.

**Methods**

The geometry is described, in the meridian plane, as a map of *N* regions separated by *M* arcs ; each region generates, by rotation around Oz, a homogeneous, isotropic and connected domain with specific electric constants. In case of internal excitation, fictitious boundaries account for the connected parts of the aperture where the modes are given.

Fourier analysing all currents and fields as functions of the azimuth angle reduces the problem to a set of independent one-dimensional problems. Integral equations are set up according to the geometry. They express the continuity of both tangential fields over each boundary.

The unknowns are (the Fourier coefficients of) the equivalent electric and magnetic currents on the boundaries between different media, plus the S-matrix coefficients for internal excitation.

The system of integral equations is solved by a Method of Moments (MoM). The discretised one-dimensional integral kernels, which result from integration over the azimuth angle, are calculated by efficient analytical-numerical methods.

**Inputs**

- the profile
- the functional parameters

**Outputs**

- Far fields : RCS, antenna patterns
- S coefficients
- Near fields over any prescribed contour
- Currents along the profile