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Decoupling of multiple antennas in terminals with chassis excitation using polarization diversity, angle diversity and current control

Li, Hui LU ; Lau, Buon Kiong LU ; Ying, Zhinong and He, Sailing (2012) In IEEE Transactions on Antennas and Propagation 60(12). p.5947-5957
Abstract
Excitation of the chassis enables single-antenna terminals to achieve good bandwidth and radiation performance, due to the entire chassis being utilized as the main radiator. In contrast, the same chassis excitation phenomenon complicates the design of multiple antennas for MIMO applications, since the same characteristic mode of the chassis may be effectively excited by more than one antenna, leading to strong mutual coupling and severe MIMO performance degradation. In this paper, we introduce a design concept for MIMO antennas to mitigate the chassis-induced mutual coupling, which is especially relevant for frequency bands below 1 GHz. We illustrate the design concept on a dual-antenna terminal at 0.93 GHz, where a folded monopole at one... (More)
Excitation of the chassis enables single-antenna terminals to achieve good bandwidth and radiation performance, due to the entire chassis being utilized as the main radiator. In contrast, the same chassis excitation phenomenon complicates the design of multiple antennas for MIMO applications, since the same characteristic mode of the chassis may be effectively excited by more than one antenna, leading to strong mutual coupling and severe MIMO performance degradation. In this paper, we introduce a design concept for MIMO antennas to mitigate the chassis-induced mutual coupling, which is especially relevant for frequency bands below 1 GHz. We illustrate the design concept on a dual-antenna terminal at 0.93 GHz, where a folded monopole at one chassis edge excites the chassis’ fundamental electric dipole mode and a coupled loop at the other chassis edge excites its own fundamental magnetic dipole mode. Since the two radiation modes are nearly orthogonal to each other, an isolation of over 30 dB is achieved. Moreover, we show that the antenna system can be conveniently modified for multiband operation, such as in the

900/1800/2600 MHz bands. Furthermore, by controlling the phase

of the feed current on the folded monopole, the two antennas can be co-located on the same chassis edge with an isolation of over 20 dB. The co-located dual antenna prototype was fabricated and verified in the measurements. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Antenna array, mutual coupling, MIMO systems, mobile communication.
in
IEEE Transactions on Antennas and Propagation
volume
60
issue
12
pages
5947 - 5957
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000312032800045
  • scopus:84870894280
ISSN
0018-926X
language
Unknown
LU publication?
yes
id
d8b337b5-8c20-4b5e-bee3-9df5703f4f7f (old id 2858429)
date added to LUP
2012-07-06 12:12:55
date last changed
2017-04-02 04:18:18
@article{d8b337b5-8c20-4b5e-bee3-9df5703f4f7f,
  abstract     = {Excitation of the chassis enables single-antenna terminals to achieve good bandwidth and radiation performance, due to the entire chassis being utilized as the main radiator. In contrast, the same chassis excitation phenomenon complicates the design of multiple antennas for MIMO applications, since the same characteristic mode of the chassis may be effectively excited by more than one antenna, leading to strong mutual coupling and severe MIMO performance degradation. In this paper, we introduce a design concept for MIMO antennas to mitigate the chassis-induced mutual coupling, which is especially relevant for frequency bands below 1 GHz. We illustrate the design concept on a dual-antenna terminal at 0.93 GHz, where a folded monopole at one chassis edge excites the chassis’ fundamental electric dipole mode and a coupled loop at the other chassis edge excites its own fundamental magnetic dipole mode. Since the two radiation modes are nearly orthogonal to each other, an isolation of over 30 dB is achieved. Moreover, we show that the antenna system can be conveniently modified for multiband operation, such as in the<br/><br>
900/1800/2600 MHz bands. Furthermore, by controlling the phase<br/><br>
of the feed current on the folded monopole, the two antennas can be co-located on the same chassis edge with an isolation of over 20 dB. The co-located dual antenna prototype was fabricated and verified in the measurements.},
  author       = {Li, Hui and Lau, Buon Kiong and Ying, Zhinong and He, Sailing},
  issn         = {0018-926X},
  keyword      = {Antenna array,mutual coupling,MIMO systems,mobile communication.},
  language     = {und},
  number       = {12},
  pages        = {5947--5957},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Antennas and Propagation},
  title        = {Decoupling of multiple antennas in terminals with chassis excitation using polarization diversity, angle diversity and current control},
  volume       = {60},
  year         = {2012},
}