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Uniform Ferrite-Loaded Open Waveguide Structure with CRLH Response and Its Application

Uniform Ferrite-Loaded Open Waveguide Structure with CRLH Response and Its Application.

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Uniform Ferrite-Loaded Open Waveguide Structure with CRLH Response and Its Application

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  1. Uniform Ferrite-Loaded Open Waveguide Structure with CRLH Response and Its Application T. Kodera and C. Caloz, “Uniform ferrite-loaded open waveguide structure with CRLH response and its application to a novel backfire-to-endfire leaky-wave antenna,” IEEE Trans. Microw. Theory Tech., vol. 57, no. 4, pp. 784-795, Apr. 2009 Advisor: Prof. Ruey-Beei Wu Speaker: Ting-Yi Huang (黃定彝)

  2. Outlines • Introduction • Proposed structure • Analytical dispersion relation • Full-wave validation • Application • Experimental results • Conclusion

  3. Introduction (1/2) • Composite right/left-handed (CRLH) tx lines • Balanced condition • Relative complex lumped unit cells • Tedious iterative analysis for applications C. Caloz and T. Itoh, “Novel microwave devices and structures based on the transmission line approach of meta-materials,” in IEEE MTT-S Int. Microw. Symp. Dig., Jun. 2003, pp. 195–198

  4. Introduction (2/2) • CRLH metamaterial structure & application • Interdigital capacitor & shunt stub inductor • Backfire-to-endfire leaky-wave antenna C. Caloz and T. Itoh, “Novel microwave devices and structures based on the transmission line approach of meta-materials,” in IEEE MTT-S Int. Microw. Symp. Dig., Jun. 2003, pp. 195–198

  5. Proposed Structure • Uniform ferrite-loaded open waveguide • Automatically balanced CRLH response

  6. Analytical Dispersion Relation (1/6) • Simplified closed waveguide structure

  7. Analytical Dispersion Relation (2/6) • Effective permeability • Plasma frequency • Resonance frequency

  8. Analytical Dispersion Relation (3/6) • For y-propagating TE wave • Wave Equation • Solution form • Boundary condition • Dispersion relation

  9. Analytical Dispersion Relation (4/6) • Dispersion diagram

  10. Analytical Dispersion Relation (5/6) • Dispersive diagram vs. WG width

  11. Analytical Dispersion Relation (6/6) • Design curves

  12. Full-Wave Validation (1/4) • Structure for the full-wave analysis

  13. Full-Wave Validation (2/4) • S-parameter by HFSS

  14. Full-Wave Validation (3/4) • Dispersion curve • HFSS(FEM) & CST(FIT) • Propagation constant by HFSS

  15. Full-Wave Validation (4/4) Left-hand range Transition Frequency Right-hand range

  16. Application (1/3) • Full space scanning leaky-wave antenna • Main beam scanning • Antenna length for efficient 90% power radiation

  17. Application (2/3) • Backfire-to-endfire scanning by CST

  18. Application (3/3) • Far-field radiation patterns by CST vs. frequency vs. bias

  19. Experimental Results (1/4) • Experimental prototype with dimensions

  20. Experimental Results (2/4) • Return loss • Photograph

  21. Experimental Results (3/4) • Beam-scanning angle vs. frequency Measurement HFSS

  22. Experimental Results (4/4) • Beam-scanning angle vs. bias Measurement HFSS

  23. Conclusions • Uniform ferrite-loaded open waveguide • Inherent CRLH balanced response • Off-resonance operation – low-loss characteristics • Full-space scanning leaky-wave antenna • Capable for frequency/bias scanning • Advantages over CRLH metamaterial structures • Perfectly uniform structure • Simple, easy to design • Tunable w/o chip components

  24. Thanks for your attention.

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