Introduction

This example looks at the scattering from a standard Radar Cross Section (RCS) test model (specifically, the ogive) using the HFSS design type with an IE region assigned to the ogive. An IE region results in a full-wave Integral Equation solver being used to analyze the model. This solver is particularly well suited for analyzing large conducting objects, and it eliminates the necessity of creating an open region (that is, a vacuum or air box) around the model to determine far field effects.

Note:

IE Regions in an HFSS design have replaced the legacy HFSS-IE design type. If you open a legacy HFSS-IE design, you are prompted with the option to automatically convert the model to an HFSS design with an IE Region applied to its objects.

You will perform the following tasks to complete this exercise:

Create a new project, insert an HFSS design, and set the solution type
Enable Legacy View Orientations
Create the ogive by drawing a segmented equation based curve and sweeping it in specified increments around the X-axis
Define an incident plane wave
Assign an IE region
Add the solution setup
Run the simulation
Overlay and animate the surface current magnitudes
Plot the monostatic RCS results

RCS Test Model (Ogive)

View of simulation results for the RCS test model

We will look at the scattering from a conducting ogive with a length of 10" and a half angle of 22.6° (0.3948 radians). The ogive lies with its axis along the global X axis. The equation that defines this model is:

F(x) = √ {1 - [x/5 * sin(22.6°)]²} - cos(22.6°)

y = F(x) * cos(φ) / [1 - cos(22.6°)]

z = F(x) * sin(φ) / [1 - cos(22.6°)]

For this exercise, x, y, and z are defined in inches.