Advanced Antenna Pattern and Mutual Coupling Prediction Software

Period of Performance: 06/09/2008 - 05/18/2010


Phase 2 SBIR

Recipient Firm

Applied EM, Inc.
100 Exploration Way, Suite 300
Hampton, VA 23666
Principal Investigator


Numerical methods have proved to be very successful in low and mid frequency (VHF/UHF) regimes. Although these methods are based on rigorous integral or partial differential equation formulations, they cannot presently solve electrically large problems of EM radiation pattern and coupling prediction associated with antennas on aircraft at higher frequencies (S/X/Ku/Ka bands). On the other hand, asymptotic high frequency (HF) methods, whose accuracy increases with frequency, such as the physical optics (PO) method and its modifications based on the physical theory of diffraction (PTD), require an integration of the surface currents over the lit portion of the platform, so they also do not scale with frequency. At those frequencies uniform geometrical theory of diffraction (UTD) is very efficient and provides a physical picture for antenna radiation mechanisms and EM interactions with the aircraft platform in terms of rays at high frequencies. However, simulation of the platform using UTD so far is accomplished using a combination of canonical objects, limiting the use of codes based on UTD for complex structures such as fight aircraft etc. Applied EM along with its team members is proposing an advanced tool based on UTD applicable to CAD geometries along with interface to various antenna modeling tools. Proposed tool will be capable of analyzing fully or partially material coated realistic aircraft platforms. Antenna pattern computations and coupling between other antennas present on the airframe. A user friendly graphical user interface with pre and post-processing capabilities such as importing, evaluating and visualizing realistic aircraft models will also be developed.