Mutual Coupling Reduction in CBS Antenna Arrays by Utilizing Tuned EM-EBG and Non-planar Ground Plane
Keywords:
CBS antennas array, EM-EBG, High Impedance Surface (HIS), mutual coupling, phase center of antennasAbstract
Radiation surface wave (surface current) on ground plane has a destructive effect on the characteristics of antennas which benefits from a common ground plane, especially Cavity Backed Slot (CBS) antennas. Surface current increases mutual coupling in an antenna array. This in turn causes unwanted characteristics in array applications. The main goal of this work is to design a new modified antenna array achieving less mutual coupling by reshaping ground plane and using tuned Elongated Mushroom Electromagnetic Band Gap (EM-EBG). Moreover, in this study, we focus on the influence of changing depth of EM-EBG holes. In this regard, four different designs for CBS antenna arrays are investigated. The results reveals that by using two new methods, namely stepped ground plane and tuned EMEBG, mutual coupling will be decreased by more than 9 dB. Decrement of mutual coupling improve radiation characteristic of array such as Front to Back Ratio (FBR) by 8 dB. The effectiveness of our design is confirmed by experimental results.
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References
S. V. Georgakopoulos, A. C. Polycarpou, C. A. Balanis, and C. Birtche, “Analysis of coupling between cavity-backed slot antennas: FDTD, FEM & measurements,” Antennas and Propagation IEEE Society International Symposium, vol. 1, pp. 582-585, July 1999.
S. V. Georgakopoulos, C. R. Birtcher, and C. A. Balanis, “Coupling, modeling and reduction techniques of cavity-backed slot antennas: FDTD versus measurements,” IEEE Trans, on Electromagnetic Compatibility, vol. 43, no. 3, Aug. 2001.
D. Sievenpiper, “High-impedance electromagnetic surfaces,” Ph.D. dissertation, Dep. Elect. Eng., Univ. of California, Los Angeles, 1999.
D. Sievenpiper, L. Zhang, R. F. J. Broas, N. G. Alexopolous, and E. Yablonovitch, “High impedance electromagnetic surfaces with a forbidden frequency band,” IEEE Trans. Microw. Theory Tech., vol. 47, no. 11, pp. 2059-2074, Nov. 1999.
F. Yang and Y. Rahmat-Samii, “Mutual coupling reduction of microstrip antennas using electromagnetic band-gap structure,” Proc. IEEE Antenna and Propagat. Soc. Int. Symp., vol. 2, pp. 478-481, 2001.
R. Abhari and G. V. Eleftheriades, “Metallodielectric electromagnetic band gap structures for suppression and isolation of the parallel plate noise in highspeed circuits,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 6, pp. 1629-1639, June 2003.
R. Cocciolo, F. R. Yang, K. P. Ma, and T. Itoh, “Aperture-coupled patch antenna on UCPBG substrate,” IEEE Trans. Microw. Theory Tech., vol. 47, no. 11, pp. 2123-2130, Nov. 1999.
M. Coulombe, S. Farzaneh Koodiani, and C. Caloz, “Compact elongated mushroom (EM)-EBG structure for enhancement of patch antenna array performances,” IEEE Trans. Antennas Propagat., vol. 58, pp. 1076-1086, 2010.
S. Manshari and M. N. Azarmanesh, “Novel design of cavity-backed slot antenna by reformed ground plane (corner notch and stepped) and elongated mushroom (EM)-EBG,” Applied Computational Electromagnetics Society, Aug. 2014.
A. A. Eldek, “Design of a high-gain cavity-backed slot antenna with mushroom cells and bent ground walls,” Progress in Electromagnetics Research Letters, vol. 20, pp. 69-76, 2011.
B. Mohajer-Iravani, S. Shahparnia, and O. M. Ramahi, “Coupling reduction in enclosures and cavities using electromagnetic band gap structures,” IEEE Trans. Electromagn. Compat., vol. 48, no. 2, pp. 292-303, 2006.
A. Habashi, J. Nourinia, and C. Ghobadi, “Mutual coupling reduction between very closely spaced patch antennas using low-profile folded split-ring resonators (FSRRs),” IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 862-865, Oct. 2011.
Ansoft High Frequency Structure Simulation (HFSS), ver. 14, Ansoft Corporation, Pittsburgh, PA, 2005.
Peter A. Rizzi, Microwave Engineering: Passive Circuits. Englewood Cliffs, NJ: Prentice-Hall, 1988.
