Reduction of Mutual Coupling for Broadband Vivaldi Antennas Using Characteristic Modes Analysis and Lumped Loads
Keywords:
Characteristic modes analysis, lumped loads, mutual coupling, Vivaldi antennaAbstract
A method to reduce mutual coupling for broadband Vivaldi antennas is presented in this paper. Theory of characteristic modes is used to analyze the surface currents on the Vivaldi antennas which may contribute to mutual coupling, and inductive loads are used to suppress these modes. Mutual coupling between adjacent Vivaldi antennas is reduced by 10~20 dB on average in a wide bandwidth. Three configurations, including the classical design, design with slot, and design with inductive loads are studied. Numerical and experimental results are presented to verify the effectiveness of this method, which ensures that the method has very little influence to normal operation of Vivaldi antennas.
Downloads
References
R. J. Garbacz and R. H. Turpin, “A generalized expansion for radiated and scattered fields,” IEEE Transactions on Antennas Propagation, vol. 19, no. 3, pp. 348-358, May 1971.
R. Harrington and J. Mautz, “Theory of characteristic modes for conducting bodies,” IEEE Transactions on Antennas Propagation, vol. 19, no. 5, pp. 622-628, Sep. 1971.
Q. Wu, W. Su, Z. Li, and D. Su, “Reduction of outof-band antenna coupling by characteristic mode analysis,” IEEE Transactions on Antennas Propagation, vol. 64, no. 7, pp. 2732-2742, 2016.
P. Liang and Q. Wu, “Characteristic mode analysis of antenna mutual coupling in the near-field,” IEEE Transactions on Antennas Propagation, in Press.
J. Shin and D. H. Schaubert, “A parameter study of stripline-fed Vivaldi notch-antenna arrays,” IEEE Transactions on Antennas and Propagation, vol. 47, no. 5, pp. 879-886, May 1999.
S. Kasturi and D. H. Schaubert, “Effect of dielectric permittivity on infinite arrays of singlepolarized Vivaldi antennas,” IEEE Transactions on Antennas and Propagation, vol. 45, no. 2, pp. 351- 358, Feb. 2006.
K. Ebnabbasi, D. Busuioc, R. Birken, and M. Wang, “Taper design of Vivaldi and co-planar tapered slot antenna (TSA) by Chebyshev transformer,” IEEE Transactions on Antennas and Propagation, vol. 60, no. 5, pp. 2252-2259, May 2012.
S. M. Rao, D. R. Wilton, and A. W. Glisson, “Electromagnetic scattering by surfaces of arbitrary shape,” IEEE Transactions on Antennas and Propagation, vol. AP-30, no. 3, May 1982.
