volume | PIER Journals

Abstract

The complex permittivity and permeability of barium hexaferrite in the 8-12 GHz range was determined by using perturbation of electromagnetically coupled Ag thick film patch antenna due to overlay. In this technique even minor change in the overlay material properties changes the antenna response. The power gain of the EMC patch antenna was enhanced by 50% due to barium hexaferrite overlay. Barium hexaferrite was synthesized by co precipitation method and their fritless thick films were fabricated by screen printing technique. The properties were found to depend on the synthesis conditions such as Fe/Ba molar ratio, pH of the solution.

1. Bernhard, J. T., E. Kiely, and G. Washington, "A smart mechanically actuated two-layer electromagnetically coupled microstrip antenna with variable frequency, bandwidth and antenna gain," IEEE Transactions on Antennas and Propagations, Vol. 49, 597-601, 2001.
doi:10.1109/8.923320 Google Scholar

2. Kulkarni, D. C., U. B. Lonkar, and V. Puri, "High frequency permeability and permittivity of Ni_xZn_(1−x)Fe₂O₄ thick film," Journal of Magnetism and Magnetic Materials, Vol. 320, 1844-1848, 2008.
doi:10.1016/j.jmmm.2008.02.110 Google Scholar

3. Kulkarni, D. C., S. P. Patil, and V. Puri, "Properties of Ni_xZn_(1−x)Fe₂O₄ thick films at microwave frequencies," Microelectronics Journal, Vol. 39, 248-252, 2008.
doi:10.1016/j.mejo.2007.12.008 Google Scholar

4. Yousefi, L., H. Attia, and O. M. Ramahi, "Broadband experimental characterization of artificial magnetic materials based on a microstrip line method," Progress In Electromagnetics Research, Vol. 90, 1-13, 2009.
doi:10.2528/PIER08121904 Google Scholar

5. Brown, A. D., J. L. Volakis, L. C. Kempel, and Y. Y. Botros, "Patch antennas on ferromagnetic substrates," IEEE Transactions on Antennas and Propagations, Vol. 47, 26-30, 1999.
doi:10.1109/8.752980 Google Scholar

6. Koledintseva, M. Y. and A. A. Kitaitsev, "Analysis of interaction between a crystallographically uniaxial ferrite resonator and a hall-effect transducer," Progress In Electromagnetics Research, Vol. 74, 1-19, 2007.
doi:10.2528/PIER07032703 Google Scholar

7. Yang, G. M., X. Xing, A. Daigle, M. Liu, O. Obi, J. W. Wang, K. Naishadham, and N. X. Sun, "Electronically tunable miniaturized antennas on magnetoelectric substrates with enhanced performance," IEEE Transactions on Magnetics, Vol. 44, 3091-3094, 2008.
doi:10.1109/TMAG.2008.2003062 Google Scholar

8. Mossalei, H. and K. Sarabandi, "Magneto-dielectrics in electromagnetic: Concept and applications," IEEE Transactions on Antennas and Propagations, Vol. 52, 1558-1567, 2004.
doi:10.1109/TAP.2004.829413 Google Scholar

9. How, H. and C. Vittoria, "Microwave impedance control over a ferrite boundary layer," IEEE Transactions on Magnetics, Vol. 41, 1126-1131, 2005.
doi:10.1109/TMAG.2004.843339 Google Scholar

10. Harris, V. G., Z. Chen, Y. Chen, S. Yoon, T. Sakal, et al. "Bahexaferrite films for next generation microwave devices (invited)," Journal of Applied Physics, Vol. 99, 08M911-1-08M911-5, 2006. Google Scholar

11. Vasishta, P. and B. R. Vishvakarma, "Some studies on two layer electromagnetically coupled microstrip antenna with dielectric cover," International Journal of Electronics, Vol. 86, 991-997, 1999.
doi:10.1080/002072199132987 Google Scholar

12. Wong, K. L., W. S. Chen, and W. L. Huang, "The absorption and coupling of an electromagnetic wave incident on a microstrip circuit with superstrate," IEEE. Transactions on Electromagnetic Compatibility, Vol. 34, 17-22, 1992.
doi:10.1109/15.121662 Google Scholar

13. Janasi, S. R., D. Rodrigues, F. J. G. Landgraf, and M. Emura, "Magnetic properties of coprecipitated barium ferrite powders as a function of synthesis conditions," IEEE Transactions on Magnetics, Vol. 36, 3327-3329, 2000.
doi:10.1109/20.908788 Google Scholar

Ms. Deepti C. Kulkarni

Dr. Vijaya Puri