Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Low-band MIMO antenna for smartphones with robust performance to user interaction

Aliakbari Abar, Hanieh LU orcid and Lau, Buon Kiong LU (2021) In IEEE Antennas and Wireless Propagation Letters 20(7). p.1195-1199
Abstract
This letter proposes a two-port MIMO smartphone antenna for frequency bands below 1 GHz, which is robust to user effects. The design is achieved by first analyzing the characteristic modes of a chassis that includes the large screen. Two modes predicted to be less affected by the user than other commonly used modes are selected. The modal currents and near-fields of the two desired modes then guide the design: The monopole-like mode introduced by the screen is tuned to resonance using shorting pins and selectively excited using the center feed location. The non-resonant loop mode is selectively excited for the first time by four inductive feeds added along the longer sides of the chassis, with proper phase shifts provided by a feeding... (More)
This letter proposes a two-port MIMO smartphone antenna for frequency bands below 1 GHz, which is robust to user effects. The design is achieved by first analyzing the characteristic modes of a chassis that includes the large screen. Two modes predicted to be less affected by the user than other commonly used modes are selected. The modal currents and near-fields of the two desired modes then guide the design: The monopole-like mode introduced by the screen is tuned to resonance using shorting pins and selectively excited using the center feed location. The non-resonant loop mode is selectively excited for the first time by four inductive feeds added along the longer sides of the chassis, with proper phase shifts provided by a feeding network. The proposed antenna features isolation of above 19 dB and envelope correlation coefficient of below 0.12 in the considered scenarios. The measured bandwidth is above 15% for both ports, and the average radiation efficiency is 2 dB and 4.57 dB higher for two user scenarios with respect to a reference design. Moreover, no adaptive matching is needed as the impedance matching is robust to the user hand/head. (Less)
Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Handset antennas, feeding network, characteristic modes, user effect, MIMO systems
in
IEEE Antennas and Wireless Propagation Letters
volume
20
issue
7
pages
5 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85104630455
ISSN
1548-5757
DOI
10.1109/LAWP.2021.3075240
project
Optimal MIMO Terminal Antennas for 5G and Beyond
Optimal MIMO Terminal Antennas for 5G and Beyond
language
English
LU publication?
yes
id
2758da39-b568-4656-8e88-4fce70103962
date added to LUP
2021-04-20 16:05:20
date last changed
2024-02-20 03:32:00
@article{2758da39-b568-4656-8e88-4fce70103962,
  abstract     = {{This letter proposes a two-port MIMO smartphone antenna for frequency bands below 1 GHz, which is robust to user effects. The design is achieved by first analyzing the characteristic modes of a chassis that includes the large screen. Two modes predicted to be less affected by the user than other commonly used modes are selected. The modal currents and near-fields of the two desired modes then guide the design: The monopole-like mode introduced by the screen is tuned to resonance using shorting pins and selectively excited using the center feed location. The non-resonant loop mode is selectively excited for the first time by four inductive feeds added along the longer sides of the chassis, with proper phase shifts provided by a feeding network. The proposed antenna features isolation of above 19 dB and envelope correlation coefficient of below 0.12 in the considered scenarios. The measured bandwidth is above 15% for both ports, and the average radiation efficiency is 2 dB and 4.57 dB higher for two user scenarios with respect to a reference design. Moreover, no adaptive matching is needed as the impedance matching is robust to the user hand/head.}},
  author       = {{Aliakbari Abar, Hanieh and Lau, Buon Kiong}},
  issn         = {{1548-5757}},
  keywords     = {{Handset antennas; feeding network; characteristic modes; user effect; MIMO systems}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{1195--1199}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Antennas and Wireless Propagation Letters}},
  title        = {{Low-band MIMO antenna for smartphones with robust performance to user interaction}},
  url          = {{https://lup.lub.lu.se/search/files/97091551/AWPL_accepted.pdf}},
  doi          = {{10.1109/LAWP.2021.3075240}},
  volume       = {{20}},
  year         = {{2021}},
}