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Microstrip Computing


Microstrip antennas and integrated circuits have many important applications e.g. in wireless communication devices. Since these devices are becoming smaller and smaller and the operation frequencies are becoming higher, traditional methods based on circuit modelling are not accurate any more and new more advanced methods based on solutions of Maxwell's equations are required.

The research group has developed, as a contract research with APLAC Solutions, full-wave electromagnetic modelling techniques based on the mixed potential integral equation. The developed methods have been applied for the analysis and simulation of microstrip antennas. In this research a stratified medium model is applied. Due to the stratified medium model many nontrivial questions arise concerning multilayered media Green's functions and their calculation.


Research Topics

  • Electromagnetic field computing with the mixed potential integral equation in layered media .
  • Multiport coaxial and stripline feeds.
  • Calculation of scattering parameters.

 

The two figures below show the scattering parameters and induced electric current density on a spiral inductor. The solution is obtained by MPIE with RWG basis and testing functions. In the calculations a stratified medium model with multilayered media Green's functions is applied.

 

Publications

  • P. Ylä-Oijala, M. Taskinen and J. Sarvas: Multilayered Media Green's Functions for MPIE with General Electric and Magnetic Sources by the Hertz Potential Approach, Progress in Electromagnetic Research, PIER 33, pp. 141-165, 2001.

  • P. Ylä-Oijala and M. Taskinen: Efficient Use of Closed Form Green's Functions for the Electromagnetic Scattering by 3D Buried Objects, Proceedings of 2001 IEEE AP-S Symposium, Vol. 4, pp. 834-837, Boston, USA, 2001.

  • J. Sarvas, P. Ylä-Oijala and M. Taskinen: Multilayered Media Green's Functions, Proceedings of 2001 USNC/URSI National Radio Science Meeting, pp. 137, Boston, USA, 2001.

  • J. Sarvas, M. Taskinen and S. Järvenpää: Computing the scattering matrix for a microstrip structure with coaxial ports. Proceedings of PIERS 2000 (Progress in Electromagnetics Research Symposium), Cambridge, MA, USA, 2000.

  • M. Taskinen and P. Ylä-Oijala: 3D microstrip structures with surface integral equation in multilayered case, Electromagnetics 2000, The 10th National Electromagnetics Meeting, Nokia Research Center, Helsinki, Finland pp. 11-12, 2000.

  • J. Sarvas: Electromagnetic field computation in multiport microstrip structures. Proc. of Claremont Conference on diff. equations in biology and industry, June 1-4, Claremont, California, pp. 423-430, World Scientific pub. Co. New Jersey, 1996.

  • J. Sarvas, M. Taskinen and S. Järvenpää: Computing the scattering matrix of a multiport and multilayer microstrip patch with the mixed potential integral equation method. PIERS 96 Conference, Innsbruck, 8-12 July, 1996.


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