Antenna Modeling

Antenna Modeling with Limited Information

Installation of large arrays on complex platforms can lead to several issues including:

  • Pattern distortion by the platform
  • RE/RS interference with other units
  • Inter-antenna coupling and assessing if passive intermodulation is needed

The typical design flow for an integrator is to import or draw the antenna geometry, specify the port excitation, and then install the antenna on the platform geometry. Unfortunately, the antenna platform modeling tasks must be completed early in the design cycle. Often, only limited antenna information is available due to proprietary restrictions or due to the fact that it is still under development.

To overcome these challenges, Galileo EMT includes antenna synthesis techniques with varying levels of complexity. During initial program phases, an equivalent antenna is synthesized using only the design specifications, such as beamwidth and sidelobe levels. As the program proceeds and more details of the antenna specifications are known, the platform antenna model can be updated. Galileo EMT allows for reverse sourcing based on desired far-field patterns. Further, the software synthesizes aperture and patch antennas efficiently. Finally, when the actual antenna design is known, it can be installed on the platform either by simulating the geometry directly or through equivalent currents in standard data formats.

A key tasks in this phase is wise model generation. Galileo EMT includes the ability to generate consistency checks to compare to the expected performance in the far field.

High-Performance Solvers and Methods

Galileo EMT includes an array of advanced solvers capable of performing complex calculations on reasonable hardware. Techniques such as the Method of Moments with MLFMA and Iterative Physical Optics solutions provide accurate and extensively validated approaches to RF simulation. These methods are complemented by a collection of asymptotic methods as well as an unique oversize cavity theory module that allows for simulation of cavity coupling up to 40 GHz.