Antenna Simulations and Shape Optimization
Electric field of a PIFA.
In addition to scattering RCS calculations, the antenna simulations and design are very important applications of the surface integral equation method, the method of moments, (MoM). MoM is particularly attractive in the analysis and design of metallic (PEC) antenna structures since only the metallic surface has to be modeled and discretized. This method allows accurate geometrical modeling and avoids modeling of empty space (air) outside the antenna surface.
Our group has developed MoM techniques for modeling arbitrary shaped 3D antenna structures containing both PEC and dielectric parts of finite size. We have developed a special algorithm to model complex composite structures with junctions and investigated various integral equation formulations and discretizations (e.g., higher order basis functions) and their usability in the antenna simulations.
In collaboration with a research group from University of Jyväskylä (prof. Raino Mäkinen, PhD Jukka Toivanen) and Optenni Ltd (Dr. Jussi Rahola) our group has been combining integral equation methods with gradient based optimization and sensitivity analysis and applied these techniques for the shape optimization of planar ultra-wide-band (UWB) antennas.
- Antenna S-parameter computations.
- MoM modeling of 3D metal-dielectric antennas.
- Antenna shape optimization and sensitivity analysis.
References
- J. I. Toivanen, R. A. E. Mäkinen, J. Rahola, S. Järvenpää and P. Ylä-Oijala: Gradient based shape optimization of UWB antennas parameterized using splines, IET Microwaves, Antennas and Propagation, 4(9), 1406-1414, 2010.
- J. Toivanen, R. A. E. Mäkinen, S. Järvenpää, P. Ylä-Oijala and J. Rahola: Electromagnetic sensitivity analysis and shape optimization using method of moments and automatic differentiation, IEEE Transactions on Antennas and Propagation, 57(1), 168-175, 2009.
- P. Ylä-Oijala, M. Taskinen and S. Järvenpää: Analysis of surface integral equations in electromagnetic scattering and radiation problems, Engineering Analysis with Boundary Elements, Vol. 32, pp. 196-209, 2008.
- S. Järvenpää, M. Taskinen and P. Ylä-Oijala: Singularity subtraction technique for high-order polynomial vector basis functions on planar triangles, IEEE Transactions on Antennas and Propagation, Vol. 54, No. 1, pp. 42-49, Jan. 2006.
- P. Ylä-Oijala, M. Taskinen and J. Sarvas: Surface integral equation method for general composite metallic and dielectric structures with junctions, Progress in Electromagnetic Research, PIER 52, pp. 81 - 108, 2005.