Antenna matching for performance optimization in compact MIMO systems

The implementation of MIMO technology on compact mobile terminal devices poses a unique challenge for system designers. This is because it requires that multiple antennas be closely separated in a confined volume, which results in strong mutual coupling among the antennas and high spatial correlation for the signals. In this paper, we present a review on the latest developments of using uncoupled impedance matching networks to counteract performance degradation due to the aforesaid effects. Then, we extend our previous study of utilizing identical uncoupled matching networks to optimize performance by allowing them to be different across the antennas. The numerical examples reveal that the enlarged optimization search space is effective in improving the received power and correlation, whereas only a modest gain in channel capacity is observed. (Less)

[1]  S. Verdú,et al.  Capacity of MIMO channels with one-sided correlation , 2004, Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738).

[2]  M.A. Jensen,et al.  Termination-dependent diversity performance of coupled antennas: network theory analysis , 2004, IEEE Transactions on Antennas and Propagation.

[3]  Jack H. Winters,et al.  On the Capacity of Radio Communication Systems with Diversity in a Rayleigh Fading Environment , 1987, IEEE J. Sel. Areas Commun..

[4]  Michael A. Jensen,et al.  Optimal uncoupled impedance matching for coupled MIMO arrays , 2006, 2006 First European Conference on Antennas and Propagation.

[5]  Rodney G. Vaughan,et al.  Closely spaced monopoles for mobile communications , 1993 .

[6]  Emre Telatar,et al.  Capacity of Multi-antenna Gaussian Channels , 1999, Eur. Trans. Telecommun..

[7]  J.B. Andersen,et al.  On closely coupled dipoles in a random field , 2006, IEEE Antennas and Wireless Propagation Letters.

[8]  Roger F. Harrington,et al.  Antenna excitation for maximum gain , 1965 .

[9]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[10]  Buon Kiong Lau,et al.  Antenna Matching for Capacity Maximization in Compact MIMO Systems , 2006, 2006 3rd International Symposium on Wireless Communication Systems.

[11]  Heinz J. Chaloupka,et al.  Novel approach for diversity and MIMO antennas at small mobile platforms , 2004, 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754).

[12]  Abbas Jamalipour,et al.  Wireless communications , 2005, GLOBECOM '05. IEEE Global Telecommunications Conference, 2005..

[13]  Buon Kiong Lau,et al.  On Closely Coupled Dipoles with Load Matching in a Random Field , 2006, 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications.

[14]  John S. Thompson,et al.  Experiments of closely coupled monopoles with load matching in a random field , 2006, 2006 First European Conference on Antennas and Propagation.

[15]  A.F. Molisch,et al.  Capacity analysis for compact MIMO systems , 2005, 2005 IEEE 61st Vehicular Technology Conference.

[16]  Buon Kiong Lau,et al.  Impact of Matching Network on Bandwidth of Compact Antenna Arrays , 2006, IEEE Transactions on Antennas and Propagation.

[17]  David Gesbert,et al.  From theory to practice: an overview of MIMO space-time coded wireless systems , 2003, IEEE J. Sel. Areas Commun..

[18]  R.G. Vaughan,et al.  Antenna diversity in mobile communications , 1987, IEEE Transactions on Vehicular Technology.

[19]  Michael A. Jensen,et al.  Mutual coupling in MIMO wireless systems: a rigorous network theory analysis , 2004, IEEE Transactions on Wireless Communications.

[20]  J. Romeu,et al.  Optimum antenna matching to minimise signal correlation on a two-port antenna diversity system , 2004 .

[21]  Preben E. Mogensen,et al.  A stochastic MIMO radio channel model with experimental validation , 2002, IEEE J. Sel. Areas Commun..

[22]  P. Kildal,et al.  Electromagnetic analysis of effective and apparent diversity gain of two parallel dipoles , 2003, IEEE Antennas and Wireless Propagation Letters.

[23]  Hermann A. Haus,et al.  Circuit Theory of Linear Noisy Networks , 1959 .

[24]  Suhas N. Diggavi,et al.  Great expectations: the value of spatial diversity in wireless networks , 2004, Proceedings of the IEEE.