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Microstrip branch line coupler analysis using 3D FDTD code with UPML

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Microstrip branch line coupler analysis using 3D FDTD code with UPML

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09 Sep 2013 (Updated )

Microstrip branch line coupler analysis is performed by the 3D FDTD + UPML routine.

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Description

FDTD 3D with UPML is used to calculate scattering coefficients S_{11}, S_{21}, S_{31} and S_{41} for planar branch line coupler following by the original paper by D. Sheen, S. Ali, M. Abouzahra, J. Kong "Application of the
Three-Dimensional Finite-Difference Time-Domain Method to the Analysis of
 planar Microstrip Circuits", IEEE Trans. on Microwave Theory and Techniques http://dx.doi.org/10.1109/22.55775).
Current code includes some improvements in comparison with the original calculations:
1) UPML instead of Mur ABCs;
2) using real metal (copper) as a patch conductor material instead of PEC;
3) applies matched load at the ends of filter's transmission microstrip lines to prevent physical reflections;
4) do not apply "magnetic wall" or "electric wall" conditions at the Ez source plane;
5) using real properties for dielectric with losses (Duroid).

Required Products MATLAB
MATLAB release MATLAB 7.14 (R2012a)
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Comments and Ratings (3)
19 Sep 2013 Vasily Kozhevnikov

Add pause(0.01) after drawnow if the animation output is very fast on your PC.

11 Sep 2013 Aleksey  
10 Sep 2013 Ulrich

Thanks for real FDTD example!

Updates
16 Sep 2013

Little fix in axes labels

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