volume | PIER Journals

Abstract

An analysis has been presented by means of mode matching method for two microwave cavities of different sizes which are fed by TE10 waveguide and which are loaded with lossy dielectric slab type material. The accuracy of the results obtained is presented together with the comparison of the results which are obtained by HFSS numerical method. The optimization of the load location has been performed in order to maximize the electrical field on the material. The principle of this optimization is based on finding the existence of the positions in which S11 reflection coefficient is the lowest. When the feeding guide for the two different microwave cavities is entirely at the centre of the resonator, the reflection coefficient distribution change has been detected according to the different positions of the material in the oven, and then the lowest positions have been found out. The electric field changes in the detected positions have been recorded.

1. Metaxas, A. C., "Radiofrequency and microwave heating: A perspective for the millennium," Power Eng. J., Vol. 14, 51-60, 2000.
doi:10.1049/pe:20000206

2. Requena-Perez, M. E., J. L. Pedreno-Molina, J. Monzo-Cabrera, and A. Diaz-Morcillo, "Multimode cavity efficiency optimizitation by optimum load location-experimental approach," IEEE Trans. on Microwave Theory and Techn., Vol. 53, No. 6, 2144-2120, 2005.

3. Monzo-Cabrera, J., J. Escalante, A. Diaz Morcillo, A. MartinezGonzales, and D. Sanchez-Hernandez, "Load matching in multimode microwave-heating applicators based on the use of dielectric layer moulding with commercial material," Microwave Opt. Technol. Lett., Vol. 41, 414-417, 2004.
doi:10.1002/mop.20156

4. Requena-Perez, M. E., J. L. Pedreno-Molina, M. Pinzolas-Prado, J. Monzo-Cabrera, A. Diaz-Morcillo, and D. Sanchez-Hernandez, "Load matching in multimode microwave-heating applicators by load location optimization," Proc. 34th Eur. Microwave Conf., 1549-1552, 2004.

5. Walker, S. J., "Multi-mode cavity effects on the microwave heating of a ceramic slab," Ph.D. Thesis, The State University of New Jersey, 2001.

6. Jiang, Z. and Z. Shen, "Mode-matching analysis of large aperture coupling and its applications to the design of waveguide directional couplers," IEEE Proc. --- Microw. Antennas and Propag., Vol. 150, 422-428, 2003.
doi:10.1049/ip-map:20030957

7. Setti, L. and S. Lefeuvre, "Model of a loaded 3D multimode cavity using a mixed method: 2D finite element method and modal analysis," IEEE Transactions on Magnetics, Vol. 31, 1574-1577, 1995.
doi:10.1109/20.376332

8. Zhao, H., I. Turner, and F. W. Liu, "Numerical simulations of the power density distribution generated in a multimode cavity by using the method of lines technique to solve directly for the electric field," IEEE Trans. on Microwave Theory and Techn., Vol. 44, 2185-2194, 1996.
doi:10.1109/22.556446

9. Mladenovic, M., A. Marincic, B. Milovanovic, and S. Ivkovic, "Identification of resonant modes in a loaded microwave rectangular cavity," Journal of Microwave Power and Electromagnetic Energy, Vol. 31, 30-34, 1998.

10. Dibben, D. C. and A. C. Metaxas, "Time domain finite element analysis of multimode microwave applicators loaded with low and high loss materials," IEEE Microwave and Guided Letters, Vol. 32, 945-948, 1996.

11. Jiang, Z. and Z. Shen, "Full wave analysis of cross-aperture waveguide couplers," IEEE Microwave and Wireless Components Letters, Vol. 12, 267-269, 2002.
doi:10.1109/LMWC.2002.801128

12. Marocco, G. and F. Bardati, "Combined time and frequency domain modeling of electromagnetic radiation from apertures on resonant cavities by FDTD-MOM method," Journal of Electromagnetic Waves and Applications, Vol. 16, 523-539, 2002.
doi:10.1163/156939302X00426

13. Zhao, H. I. and I. W. Turner, "An analysis of the finite-difference time-domain method for modeling the microwave heating of dielectric materials within a three-dimensional cavity system," Journal of Microwave Power and Electromagnetic Energy, Vol. 31, 199-214, 1996.

14. Liu, F., I. Turner, and M. E. Bialkowski, "A finite-difference time-domain simulation of power density distribution in a dielectric loaded microwave cavity," J. Microwave power and Electromag. Energy, Vol. 29, 138-148, 1994.

15. Bardi, I., O. Biro, K. Preis, G. Vrisk, and K. R. Richter, "Nodal and edge element analysis of inhomogeneously loaded 3D cavities," IEEE Trans. on Microwave Theory and Techn., Vol. 28, 1142-1145, 1992.

16. Hallac, A. and A. C. Metaxas, "Finite element time domain analysis of microwave heating applicators using higher order vector finite elements," Proc. 9th International Conference on Microwave and High Frequency Heating, No. 21, UK, Sep. 2003.

17. Terril, N. D., "Field simulation for the microwave heating of thin ceramic fibers,", MSc. Thesis, Virginia Pollytechnique Institute and State University, 1998..

Dr. Okan Sule

Prof. Sedef Kent