Low-band MIMO antenna for smartphones with robust performance to user interaction
(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:
https://lup.lub.lu.se/record/2758da39-b568-4656-8e88-4fce70103962
- author
- Aliakbari Abar, Hanieh LU and Lau, Buon Kiong LU
- organization
- publishing date
- 2021
- 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}}, }