Antenna mutual coupling effects on correlation, efficiency and Shannon capacity

Stjernman, Anders

doi:10.1109/eucap.2006.4584578

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…6b. The total power available for radiation P rad,m when feeding source antenna port m with the power P avail,m is given by (6) The power of the input signal vector in the channel equation (2) is given by , where x is a column vector containing the transmitted signals on the antenna ports. According to this definition, we can replace by .…”

Section: Derivation Of Mutual Coupling Matrixmentioning

confidence: 99%

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Impact of mutual coupling on capacity in large MIMO antenna arrays

Gustafsson

Aulin

Högberg

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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It is well known that the wireless network spectral efficiency in a multipath environment can be increased by means of spatial multiplexing. By using propagation channel models it is possible to simulate and estimate the spectral efficiency. Winner II is to this date one of the most popular propagation channel models. It uses the geometric stochastic approach to model multipath channel properties for various types of environments such as urban, suburban, and indoor. However, the Winner II model does not take antenna coupling into account. Mutual coupling can be modeled by multiplying the channel matrix H by a coupling matrix C, but the question is how to calculate this coupling matrix? In this paper we introduce a method to calculate the coupling matrix and analyze this with the Winner II model.

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Section: Derivation Of Mutual Coupling Matrixmentioning

confidence: 99%

“…Several previous reports investigated MIMO capacity when the antenna system includes mutual coupling [3] [4] [5] [6]. This paper presents a new simple method to calculate the coupling matrix C. Multiplying the channel matrix H with C creates a new channel matrix H c that includes mutual coupling.…”

Section: Introductionmentioning

confidence: 99%

Impact of mutual coupling on capacity in large MIMO antenna arrays

Gustafsson

Aulin

Högberg

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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“…Another approach is to use the far-field functions of the two ports. The relationship assuming that the power spectrum of the incident field is uniform over the sphere is given by [4] …”

Section: A Correlationmentioning

confidence: 99%

“…It has also been shown that a decoupling network can completely eliminate the coupling while at the same time match the antennas to zero reflection at a single frequency. There is still a good improvement in the capacity for very narrow-band systems (2%) with an antenna separation as close as 0.03 wavelengths [4].…”

Section: Introductionmentioning

confidence: 99%

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MIMO performance of closely spaced antennas in the 700 MHz band

Derneryd

Friden

Stjernman

2010

2010 URSI International Symposium on Electromagnetic Theory

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Performance of two 0.3 wavelengths separated antennas in the 700 MHz band are evaluated and improved by connecting a matching and decoupling network to the antenna ports. It is shown through simulations that the network improves efficiency, diversity gain, MIMO Shannon capacity, and reduces the correlation coefficient. The concept is implemented and validated in two dual-antenna mock-ups with slightly different ground plane sizes. I. INTRODUCTIONThere is a constant demand for higher bit rates in wireless communication systems. In a multi-path environment, this is achieved by employing MIMO technology with multiple antennas at both ends of the communication link [1][2][3]. In mobile handhelds the available separation of antennas is limited, which results in signals being coupled to the nearby antennas and hence reduces efficiency and degrades the performance. Designing a multi-antenna with low antenna correlation and high efficiency in small hand-held devices is a real challenge, especially at the lower cellular frequency bands.The objective of this work is to evaluate and improve the performance of closely spaced antennas operating in a rich scattering environment. A multi-antenna with two closely spaced radiating elements in the upper 700 MHz band is designed and evaluated. In order to improve the performance, a matching and decoupling network connected to the antenna ports is implemented, which decreases antenna correlation and increases efficiency. Performance in terms of efficiency, correlation, Shannon capacity, and diversity gain are evaluated.

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