1. Microwave Diffraction -W Band Lattice Scattering C. P. Yuan ( 袁景濱 ) 02/17/2009

2. Outline Introductions -Principle, and Motivation Plane Wave -Now and Before Diffraction -HFSS Simulation Conclusion

3. Motivation Use microwave source to do X-ray diffraction, so the lattices is observable. It is easier to study the phenomenon in a lattice structure.

4. Fourier Series

5. 3D Fourier Series

6. 3D Fourier Series (continued)

7. Lattice Diffraction Crystal specimen

8. Lattice Diffraction (continued)

9. Bragg diffraction (continued)

10. The wave is coherent and plane. The wave transits the whole lattices. Most of wave is transmissible for a lattice. Enough many lattices Enough far for the observer Hypotheses

11. Plane Wave Source CoaxialHorn

12. HFSS Plane Wave

13. Transmission in Materials dielectricconductor

14. Before and Now Before Now

15. Structure WR10   Freq. = 94 GHz 0.4 mm 1.27 mm 18 mm 6 mm d = 2.25 mm 6 cm

16. Transmission

18. Conclusion Use the horn structure can reduce the reflection. The dielectric materiel is more suitable than the conductor.

19. Reference Charles Kittel, “Introduction to Solid State Physics” Mark Cartwright, “Fourier Methods” Walter Rudin, “Principles of Mathematical Analysis” 欒丕網 陳啟昌 --- 光子晶體 F. Sporleder and H.-G. Unger, “Waveguide Tapers Transitions and Couplers” HFSS Simulator - Ansoft Corporation