Design of Decoupling Networks for Circulant Symmetric Antenna Arrays

Small element spacing in compact arrays results in strong mutual coupling between array elements. Performance degradation associated with the strong coupling can be avoided through the introduction of a decoupling network consisting of interconnected reactive elements. We present a systematic design procedure for decoupling networks of symmetrical arrays with more than three elements and characterized by circulant scattering parameter matrices. The elements of the decoupling network are obtained through repeated decoupling of the characteristic eigenmodes of the array, which allows the calculation of element values using closed-form expressions.

[1]  Yantao Yu,et al.  Port Decoupling for Small Arrays by Means of an Eigenmode Feed Network , 2008, IEEE Transactions on Antennas and Propagation.

[2]  D. Pozar.  Microwave Engineering , 1990 .

[3]  Jacob Coetzee,et al.  Microstrip Decoupling Networks for Low-Order Multiport Arrays with Reduced Element Spacing , 2005 .

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

[5]  J. Andersen,et al.  Decoupling and descattering networks for antennas , 1976 .

[6]  Volker Jungnickel,et al.  Capacity of MIMO systems with closely spaced antennas , 2003, IEEE Communications Letters.

[7]  Xin Wang,et al.  Performance enhancement of smart antennas with reduced element spacing , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[8]  Richard D. Gitlin,et al.  The impact of antenna diversity on the capacity of wireless communication systems , 1994, IEEE Trans. Commun..

[9]  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).

[10]  Xin Wang,et al.  A superdirective 3-element array for adaptive beamforming , 2003 .

[11]  I. Gupta,et al.  Effect of mutual coupling on the performance of adaptive arrays , 1983 .

[12]  J. C. Coetzee,et al.  An alternative approach to decoupling of arrays with reduced element spacing # , 2006 .

[13]  R. Stephan,et al.  Decoupling and Matching Network for Miniaturised 3-Port Antenna Arrays Based on 180° Couplers , 2007, 2007 2nd International ITG Conference on Antennas.

[14]  Jacob Coetzee,et al.  A dual-polarized microstrip antenna array with port decoupling for MIMO systems , 2004 .

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