XGtd is a general purpose ray-based electromagnetic analysis tool for assessing the effects of a vehicle or vessel on antenna radiation, predicting coupling between antennas, and predicting radar cross section (RCS).  It is ideally suited for applications with higher frequencies or very large platforms where the requirements of a full physics method may exceed available computational resources.

XGtd’s capabilities extend well beyond standard ray tracing codes, incorporating techniques including Geometric Optics (GO), the Uniform Theory of Diffraction (UTD), Physical Optics (PO), and the Method of Equivalent Currents (MEC). XGtd provides high-fidelity outputs tailored to its intended applications.

Computational methods include:

  • Ray tracing methods: Shooting and bouncing ray & image theory
  • E-field evaluations using UTD, GO, PO, and MEC
  • High-fidelity field predictions in shadow zones including creeping wave effects
  • Multipath calculations including reflections, transmissions, wedge diffractions, surface diffractions, and creeping waves


Antenna Radiation from Platform-Mounted Antennas

Calculate far zone antenna radiation patterns that incorporate the effects of multipath and shadowing with the platform itself. Also assess the combined effect of multiple radiators.

Radar Cross Section (RCS)

XGtd’s PO-MEC model calculates monostatic and bistatic RCS with greater accuracy than traditional PO methods. Results include both co-polarized and cross-polarized returns, as well as ray path visualization.

Co-Site Analysis

Transceivers for managing co-located antennas to represent independent, co-located transmitter receiver pairs.  S-parameter output can be displayed in project view and plots or exported in Touchstone file.

Anechoic Chamber Simulation

The Anechoic Chamber Editor makes set-up of chamber scenarios straightforward. Includes specialized materials for chamber environments.

XGtd Features

Large Platform Simulations

XGtd’s methods are less impacted by the platform’s electrical size than full wave techniques, supporting larger structures and higher frequencies.


Ray Path Visualization

Display ray paths for far zone antenna gain, RCS calculations, or antenna coupling. Rays are colored according to strength, allowing users to identify scattering features.

XFdtd Compatibility for Higher Fidelity Antenna Patterns

Calculate antenna radiation patterns for complex antenna designs using XFdtd. Import into XGtd to determine effects of placement on electrically-large platforms.

Learning and Documentation

Application Examples

White Papers



XGtd Brochure

XGtd Brochure