Broadband Decoupling and Matching of a Superdirective Two-Port Antenna Array

Decoupling and matching networks may be used to improve the performance of compact antenna arrays where mutual radiator coupling has caused a degradation of the diversity capabilities. A popular network consists of a 180deg rat-race directional coupler, which decouples the antenna ports, followed by impedance matching networks at each port. Researchers, however, usually neglect the presence of losses both within the antenna array and the decoupling and matching network. For this reason, we have built various narrowband and broadband matching networks and compare their performances with the help of calibrated far-field measurement data.

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

[2]  R. Stephan,et al.  Eigenmode decoupling of miniaturised diversity antennas using compact quasi-lumped networks , 2008, 2008 Loughborough Antennas and Propagation Conference.

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

[4]  A. Stjernman.  Relationship between radiation pattern correlation and scattering matrix of lossless and lossy antennas , 2005 .

[5]  B. Yarman,et al.  A Simplified "Real Frequency" Technique Appliable To Broadband Multistage Microwave Amplifiers , 1982, 1982 IEEE MTT-S International Microwave Symposium Digest.

[6]  J. Pierce,et al.  Multiple Diversity with Nonindependent Fading , 1960, Proceedings of the IRE.

[7]  R. Fano.  Theoretical limitations on the broadband matching of arbitrary impedances , 1950 .

[8]  W. P. Geren,et al.  A practical technique for designing multiport coupling networks , 1996 .

[9]  J. Romeu,et al.  Decorrelation of a closely spaced four element antenna array , 2005, 2005 IEEE Antennas and Propagation Society International Symposium.

[10]  J. Romeu,et al.  Decoupling and decorrelation of two closely spaced monopoles for optimum MIMO capacity , 2006, 2006 First European Conference on Antennas and Propagation.

[11]  R. Stephan,et al.  Miniaturized antenna arrays using decoupling networks with realistic elements , 2006, IEEE Transactions on Microwave Theory and Techniques.

[12]  C. Volmer,et al.  An Eigen-Analysis of Compact Antenna Arrays and Its Application to Port Decoupling , 2008, IEEE Transactions on Antennas and Propagation.

[13]  Yuanxun Wang,et al.  Mode-Based Beamforming with Closely Spaced Antennas , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[14]  Xin Wang,et al.  Kompakte Mehrtorantennen für die adaptive Keulenformung , 2004 .

[15]  D. Youla,et al.  A New Theory of Broad-band Matching , 1964 .

[16]  Matthias A. Hein,et al.  Power transfer networks at RF frequencies: new design procedures with implementation roadmap , 2006, 2006 IEEE International Symposium on Circuits and Systems.

[17]  C. Volmer,et al.  A Descriptive Model for Analyzing the Diversity Performance of Compact Antenna Arrays , 2009, IEEE Transactions on Antennas and Propagation.

[18]  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).

[19]  Rodney G. Vaughan,et al.  Measurement and evaluation of multi-antenna handsets in indoor mobile communication , 2001 .

[20]  H. W. Bode,et al.  Network analysis and feedback amplifier design , 1945 .

[21]  B. Yarman,et al.  A Simplified "Real Frequency" Technique Applied to Broad-Band Multistage Microwave Amplifiers , 1982 .