Optimal Antenna Matching and Mutual Coupling Effect of Antenna Array in MIMO Receiver

Hiroki IURA; Hiroyoshi YAMADA; Yasutaka OGAWA; Yoshio YAMAGUCHI

doi:10.1093/ietcom/e90-b.4.960

Optimal Antenna Matching and Mutual Coupling Effect of Antenna Array in MIMO Receiver

Hiroki IURA, Hiroyoshi YAMADA, Yasutaka OGAWA, Yoshio YAMAGUCHI

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Antenna array is essential factor for multiple- input multiple-output (MIMO) wireless systems. Since the antenna array is composed of closely spaced elements, the mutual coupling among the elements cannot be ignored for the best performance of the array. Mutual coupling affects the MIMO channel, so the performance of a MIMO system, including channel capacity and diversity, varies with the degree of mutual coupling. The effect of mutual coupling is a function of the antenna load impedance. Therefore, designing an optimal element-matched array for a MIMO system requires consideration of the optimal matching condition for the array elements, the one that maximizes the channel capacity. We evaluated the effects of mutual coupling with various matching conditions in dipole arrays, and investigated their effects on the path correlation and channel capacity of MIMO systems. Simulation showed that the conventional conjugate matching of each element is still suitable for closely spaced elements except when the separation is about less than 0.1λ. Theoretical consideration of the received power of a closely-spaced-element array is also provided to show the effects of mutual coupling.

Publication: IEICE TRANSACTIONS on Communications Vol.E90-B No.4 pp.960-967

Publication Date: 2007/04/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e90-b.4.960

Type of Manuscript: PAPER

Category: Antennas and Propagation

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Hiroki IURA, Hiroyoshi YAMADA, Yasutaka OGAWA, Yoshio YAMAGUCHI, "Optimal Antenna Matching and Mutual Coupling Effect of Antenna Array in MIMO Receiver" in IEICE TRANSACTIONS on Communications, vol. E90-B, no. 4, pp. 960-967, April 2007, doi: 10.1093/ietcom/e90-b.4.960.
Abstract: Antenna array is essential factor for multiple- input multiple-output (MIMO) wireless systems. Since the antenna array is composed of closely spaced elements, the mutual coupling among the elements cannot be ignored for the best performance of the array. Mutual coupling affects the MIMO channel, so the performance of a MIMO system, including channel capacity and diversity, varies with the degree of mutual coupling. The effect of mutual coupling is a function of the antenna load impedance. Therefore, designing an optimal element-matched array for a MIMO system requires consideration of the optimal matching condition for the array elements, the one that maximizes the channel capacity. We evaluated the effects of mutual coupling with various matching conditions in dipole arrays, and investigated their effects on the path correlation and channel capacity of MIMO systems. Simulation showed that the conventional conjugate matching of each element is still suitable for closely spaced elements except when the separation is about less than 0.1λ. Theoretical consideration of the received power of a closely-spaced-element array is also provided to show the effects of mutual coupling.
URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.4.960/_p

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@ARTICLE{e90-b_4_960,
author={Hiroki IURA, Hiroyoshi YAMADA, Yasutaka OGAWA, Yoshio YAMAGUCHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Optimal Antenna Matching and Mutual Coupling Effect of Antenna Array in MIMO Receiver},
year={2007},
volume={E90-B},
number={4},
pages={960-967},
abstract={Antenna array is essential factor for multiple- input multiple-output (MIMO) wireless systems. Since the antenna array is composed of closely spaced elements, the mutual coupling among the elements cannot be ignored for the best performance of the array. Mutual coupling affects the MIMO channel, so the performance of a MIMO system, including channel capacity and diversity, varies with the degree of mutual coupling. The effect of mutual coupling is a function of the antenna load impedance. Therefore, designing an optimal element-matched array for a MIMO system requires consideration of the optimal matching condition for the array elements, the one that maximizes the channel capacity. We evaluated the effects of mutual coupling with various matching conditions in dipole arrays, and investigated their effects on the path correlation and channel capacity of MIMO systems. Simulation showed that the conventional conjugate matching of each element is still suitable for closely spaced elements except when the separation is about less than 0.1λ. Theoretical consideration of the received power of a closely-spaced-element array is also provided to show the effects of mutual coupling.},
keywords={},
doi={10.1093/ietcom/e90-b.4.960},
ISSN={1745-1345},
month={April},}

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TY - JOUR
TI - Optimal Antenna Matching and Mutual Coupling Effect of Antenna Array in MIMO Receiver
T2 - IEICE TRANSACTIONS on Communications
SP - 960
EP - 967
AU - Hiroki IURA
AU - Hiroyoshi YAMADA
AU - Yasutaka OGAWA
AU - Yoshio YAMAGUCHI
PY - 2007
DO - 10.1093/ietcom/e90-b.4.960
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2007
AB - Antenna array is essential factor for multiple- input multiple-output (MIMO) wireless systems. Since the antenna array is composed of closely spaced elements, the mutual coupling among the elements cannot be ignored for the best performance of the array. Mutual coupling affects the MIMO channel, so the performance of a MIMO system, including channel capacity and diversity, varies with the degree of mutual coupling. The effect of mutual coupling is a function of the antenna load impedance. Therefore, designing an optimal element-matched array for a MIMO system requires consideration of the optimal matching condition for the array elements, the one that maximizes the channel capacity. We evaluated the effects of mutual coupling with various matching conditions in dipole arrays, and investigated their effects on the path correlation and channel capacity of MIMO systems. Simulation showed that the conventional conjugate matching of each element is still suitable for closely spaced elements except when the separation is about less than 0.1λ. Theoretical consideration of the received power of a closely-spaced-element array is also provided to show the effects of mutual coupling.
ER -