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A Descriptive Model for Analyzing the Diversity Performance of Compact Antenna Arrays

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4 Author(s)
Christian Volmer ; Inst. for Inf. Technol., Il-menau Univ. of Technol., Ilmenau ; JÖrn Weber ; Ralf Stephan ; Matthias A. Hein

Mutual coupling has negative impact on the radiation properties of compact antenna arrays when the spacing of individual radiators is considerably closer than half a wavelength. We have previously put forward a description of the radiation efficiency of an arbitrary antenna array in terms of orthogonal radiating eigenmodes. The present publication elaborates on this concept and presents a descriptive equivalent circuit model for a coupled antenna array. We show that eigenmodes undergo independent Rayleigh fading under appropriate conditions. Also, we demonstrate how practical closed-form expressions in terms of the array's scattering matrix can be derived, which characterize the diversity performance and therefore are convenient measures for the radiation quality of a compact antenna array.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:57 ,  Issue: 2 )