CST – Computer Simulation Technology

Design of orthogonal MIMO handset antennas based on characteristic mode manipulation at frequency bands below 1 GHz
H. Li, Z. Miers, B. K. Lau
vol. 62, no. 5,May 2014
pp. 2756-2766
Antenna array, mobile antenna, multiple-input multiple-output (MIMO) systems, mutual coupling
Multi-antenna design in compact mobile handsets at frequency bands below 1 GHz is very challenging, since severemutual 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. Bymanipulating 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 matchedmulti-antennaswith low coupling and correlation are achieved. A chassis loaded with two T-shaped metal strips above its longer edges is taken as an example modification to illustrate the effectiveness of the proposed design approach at 900 MHz. This modification creates a new characteristicmode 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 (880–960MHz), 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.

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