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Wideband MIMO handset antenna design based on theory of characteristic modes
Author(s) -
Li Ke,
Shi Yan
Publication year - 2018
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21217
Subject(s) - wideband , mimo , handset , antenna (radio) , physics , acoustics , electronic engineering , frequency band , engineering , electrical engineering , beamforming
A novel multi‐input multi‐output (MIMO) antenna array in a compact mobile handset has been designed to operate in a wide frequency band below 1 GHz. Based on theory of characteristic modes (TCM), a pair of parallel folding metal strips is introduced to make a chassis generate two orthogonal eigenmodes with wideband resonant characteristics. A meander line‐loaded monopole structure is employed to excite higher frequency eigenmode, and a parallel lumped L‐C structure is used to excite lower frequency eigenmode. With two proposed feeding structures, the proposed MIMO antenna array can operate in a wide frequency band covering 745‐960 MHz with an envelope correlation coefficient (ECC) <0.12. Simulation and measurement results demonstrate that the proposed MIMO antenna array has total efficiency better than 40% over the whole operating band.