Far zone radiation incorporates shadowing and scattering from fuselage and wingsXGtd Release 2.5
Far Zone Radiation, RCS, and EMI/EMC
for Electrically-Large Platforms
XGtd is a general purpose ray-based electromagnetic analysis tool for assessing the effects of a vehicle or vessel on antenna radiation, estimating radar cross section (RCS), and predicting coupling between antennas. Based on Geometric Optics and the Uniform Geometrical Theory of Diffraction (GTD/UTD), performance and memory requirements are not affected by the physical size of objects, but rather by the number of faceted surfaces used to model them. This makes it ideally suited to applications with higher frequencies or very large platforms where the electrical size of a computation may be too large for full physics techniques, such as Finite Difference Time Domain (FDTD). XGtd also includes a number of capabilities that extend well beyond standard ray-tracing codes to provide high-fidelity outputs that are tailored to its intended application, including the following:
- Far Zone Antenna Radiation for surface-mounted antennas
- Monostatic or bistatic Radar Cross Section (RCS)
- Creeping Wave Diffraction: high-fidelity field prediction in shadow zones
- Doppler for moving transmitters and receivers
- Coupling between antennas (equivalent to S-parameters)
- Wide range of outputs for predicted EM fields and channel characteristics
What’s New in Version 2.5
The latest release of XGtd includes speed improvements and added functionality to both the engine and the user interface. Highlights include the following:
- 64-bit version: larger, more complex models and factor of 1.5 to 2 times speedup
- Optimized Ray Engine: speed improvement for large or complex models
- Synthesis of Antenna Array Gain Patterns
See New Features for a detailed list.
Key Benefits
Radiation from antenna on shuttle. Results agree with XFdtd full physics code.
Far Zone Radiation for Platform-Mounted Antennas
Calculate far-zone antenna radiation patterns that fully incorporate the local effects of the platform.
Local Radiation on Navy cruiserVirtually No Limit to Platform Size
GTD/UTD methods are limited by the level of detail used to model an object, not its physical size. Furthermore, new optimizations and the 64-bit version now allow much more complex CAD models (demonstrated with >12,000 faces).
Bistatic RCS (Navy cruiser)Radar Cross Section
Calculate monostatic and bistatic radar cross section, including both co-polarized and cross-polarized returns.
Helical antenna in XFdtd mounted on large satellite in XGTDXFdtd/XGtd Hybrid Capability for Higher Fidelity
Calculate antenna radiation patterns for complex antenna designs within XFdtd, incorporating all impedance, coupling and scattering effects. Import into XGtd to determine effects of placement on electrically-large platforms.
Dominant paths and received power at second antennaCoupling & Dominant Paths for EMI/EMC Assessment
Display dominant paths between transmitter and receiver locations; use to better understand propagation or determine methods to mitigate undesired interference or scattering.
C-17 in large anechoic chamberSpecialized Anechoic Chamber Editor with RAM Materials
Use Anechoic Chamber Editor to set up and model test geometry and specialized materials within chambers.
The full XGtd product, including its powerful graphical user interface, runs on the Windows XP, Vista, and Windows 7 operating systems, including 32-bit and 64-bit versions. The propagation analysis engine runs on both Windows and Linux operating systems and can take advantage of multiple processors to reduce the computation time.