Design of Orthogonal MIMO Handset antennas based on characteristic mode manipulation at frequency bands below 1 GHz
(2014) In IEEE Transactions on Antennas and Propagation 62(5). p.2756-2766- Abstract
- Multi-antenna design in compact mobile handsets at frequency bands below 1 GHz is very challenging, since severe mutual coupling is commonly induced by simultaneous excitation of the chassis’ fundamental dipole mode by more than one antenna element. To address this problem, a novel multi-antenna design approach is proposed herein to obtain efficient and uncorrelated antennas. By manipulating the chassis structure, more than one characteristic mode is enabled to resonate at frequencies below 1 GHz. With proper excitations for different characteristic modes, which are orthogonal to each other, well matched multi-antennas with low coupling and correlation are achieved. A chassis loaded with two T-shaped metal strips above its edges is taken... (More)
- Multi-antenna design in compact mobile handsets at frequency bands below 1 GHz is very challenging, since severe mutual coupling is commonly induced by simultaneous excitation of the chassis’ fundamental dipole mode by more than one antenna element. To address this problem, a novel multi-antenna design approach is proposed herein to obtain efficient and uncorrelated antennas. By manipulating the chassis structure, more than one characteristic mode is enabled to resonate at frequencies below 1 GHz. With proper excitations for different characteristic modes, which are orthogonal to each other, well matched multi-antennas with low coupling and correlation are achieved. A chassis loaded with two T-shaped metal strips above its edges is taken as an example modification to illustrate the effectiveness of the proposed design approach at 900 MHz. This modification creates a new characteristic mode which resonates near 900 MHz.. Afterward, two antenna feeds were designed to efficiently excite the chassis’ fundamental dipole mode and the T-strip mode with very low correlation. The T-strip antenna covers LTE Band 8 (880-960 MHz), and the dipole mode antenna covers both LTE Band 5 (824-894 MHz) and LTE Band 8. The proposed dual-antenna design was found to outperform a reference design significantly, both with and without user interactions (i.e., one-hand and two-hand data grips). Practical aspects of mobile handset antennas are also investigated. The prototype was also fabricated and measured, and the measured results show reasonable agreements with the simulated results. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4251200
- author
- Li, Hui LU ; Miers, Zachary LU and Lau, Buon Kiong LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- IEEE Transactions on Antennas and Propagation
- volume
- 62
- issue
- 5
- pages
- 2756 - 2766
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- external identifiers
-
- wos:000336667900045
- scopus:84900549594
- ISSN
- 0018-926X
- DOI
- 10.1109/TAP.2014.2308530
- project
- Systematic Antenna Design Using the Theory of Characteristic Modes
- EIT_ANTCHN Antenna-Channel Harmonization for Throughput Enhancement in Advanced Mobile Terminals
- EIT_Optantsys Novel Antenna System Design Paradigm for High Performance Mobile Communications
- language
- English
- LU publication?
- yes
- id
- ce04d094-b1bf-4f1f-a530-00634a44b781 (old id 4251200)
- date added to LUP
- 2016-04-01 13:32:22
- date last changed
- 2022-05-15 05:34:55
@article{ce04d094-b1bf-4f1f-a530-00634a44b781, abstract = {{Multi-antenna design in compact mobile handsets at frequency bands below 1 GHz is very challenging, since severe mutual coupling is commonly induced by simultaneous excitation of the chassis’ fundamental dipole mode by more than one antenna element. To address this problem, a novel multi-antenna design approach is proposed herein to obtain efficient and uncorrelated antennas. By manipulating the chassis structure, more than one characteristic mode is enabled to resonate at frequencies below 1 GHz. With proper excitations for different characteristic modes, which are orthogonal to each other, well matched multi-antennas with low coupling and correlation are achieved. A chassis loaded with two T-shaped metal strips above its edges is taken as an example modification to illustrate the effectiveness of the proposed design approach at 900 MHz. This modification creates a new characteristic mode which resonates near 900 MHz.. Afterward, two antenna feeds were designed to efficiently excite the chassis’ fundamental dipole mode and the T-strip mode with very low correlation. The T-strip antenna covers LTE Band 8 (880-960 MHz), and the dipole mode antenna covers both LTE Band 5 (824-894 MHz) and LTE Band 8. The proposed dual-antenna design was found to outperform a reference design significantly, both with and without user interactions (i.e., one-hand and two-hand data grips). Practical aspects of mobile handset antennas are also investigated. The prototype was also fabricated and measured, and the measured results show reasonable agreements with the simulated results.}}, author = {{Li, Hui and Miers, Zachary and Lau, Buon Kiong}}, issn = {{0018-926X}}, language = {{eng}}, number = {{5}}, pages = {{2756--2766}}, publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}}, series = {{IEEE Transactions on Antennas and Propagation}}, title = {{Design of Orthogonal MIMO Handset antennas based on characteristic mode manipulation at frequency bands below 1 GHz}}, url = {{https://lup.lub.lu.se/search/files/42807229/li_tap2014.pdf}}, doi = {{10.1109/TAP.2014.2308530}}, volume = {{62}}, year = {{2014}}, }