MIMO mobile handset antenna merging characteristic modes for increased bandwidth

Changjiang Deng; Zhenghe Feng; Sean Victor Hum

doi:10.1109/TAP.2016.2537358

MIMO mobile handset antenna merging characteristic modes for increased bandwidth

Changjiang Deng, Zhenghe Feng, Sean Victor Hum

Research output: Contribution to journal › Article › peer-review

100 Citations (Scopus)

Abstract

The behavior of a mobile handset chassis-mode antenna with a metal bezel is analyzed in this paper by utilizing the theory of characteristic modes (TCM). Two eigenmodes, one from the chassis (0.5λ dipole mode) and the other one from the bezel (1λ-perimeter mode), are merged by a monopole exciter to broaden the antenna bandwidth below 1 GHz. A new eigenmode from the bezel (1.5λ-perimeter mode) is also exploited to achieve multiple-input multiple-output (MIMO) performance. The characteristics of the antenna are verified with an experimental prototype and measurements. The measured input reflection bandwidths from the two ports are 263 MHz (742-1005 MHz) and 93 MHz (863-956 MHz), respectively. The port isolation is more than 7.4 dB across the whole band of interest. Finally, the monopole exciter, which excites two eigenmodes in the low-frequency band, is modified to provide more resonances in the upper frequency band, providing coverage in the range of 1715-2060 MHz and 2280-2710 MHz.

Original language	English
Article number	7423708
Pages (from-to)	2660-2667
Number of pages	8
Journal	IEEE Transactions on Antennas and Propagation
Volume	64
Issue number	7
DOIs	https://doi.org/10.1109/TAP.2016.2537358
Publication status	Published - Jul 2016
Externally published	Yes

Keywords

Characteristic modes
mobile antennas
multifrequency antennas
multiple-input multiple-output (MIMO) systems

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10.1109/TAP.2016.2537358

Cite this

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title = "MIMO mobile handset antenna merging characteristic modes for increased bandwidth",

abstract = "The behavior of a mobile handset chassis-mode antenna with a metal bezel is analyzed in this paper by utilizing the theory of characteristic modes (TCM). Two eigenmodes, one from the chassis (0.5λ dipole mode) and the other one from the bezel (1λ-perimeter mode), are merged by a monopole exciter to broaden the antenna bandwidth below 1 GHz. A new eigenmode from the bezel (1.5λ-perimeter mode) is also exploited to achieve multiple-input multiple-output (MIMO) performance. The characteristics of the antenna are verified with an experimental prototype and measurements. The measured input reflection bandwidths from the two ports are 263 MHz (742-1005 MHz) and 93 MHz (863-956 MHz), respectively. The port isolation is more than 7.4 dB across the whole band of interest. Finally, the monopole exciter, which excites two eigenmodes in the low-frequency band, is modified to provide more resonances in the upper frequency band, providing coverage in the range of 1715-2060 MHz and 2280-2710 MHz.",

keywords = "Characteristic modes, mobile antennas, multifrequency antennas, multiple-input multiple-output (MIMO) systems",

author = "Changjiang Deng and Zhenghe Feng and Hum, {Sean Victor}",

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AU - Feng, Zhenghe

AU - Hum, Sean Victor

PY - 2016/7

Y1 - 2016/7

N2 - The behavior of a mobile handset chassis-mode antenna with a metal bezel is analyzed in this paper by utilizing the theory of characteristic modes (TCM). Two eigenmodes, one from the chassis (0.5λ dipole mode) and the other one from the bezel (1λ-perimeter mode), are merged by a monopole exciter to broaden the antenna bandwidth below 1 GHz. A new eigenmode from the bezel (1.5λ-perimeter mode) is also exploited to achieve multiple-input multiple-output (MIMO) performance. The characteristics of the antenna are verified with an experimental prototype and measurements. The measured input reflection bandwidths from the two ports are 263 MHz (742-1005 MHz) and 93 MHz (863-956 MHz), respectively. The port isolation is more than 7.4 dB across the whole band of interest. Finally, the monopole exciter, which excites two eigenmodes in the low-frequency band, is modified to provide more resonances in the upper frequency band, providing coverage in the range of 1715-2060 MHz and 2280-2710 MHz.

AB - The behavior of a mobile handset chassis-mode antenna with a metal bezel is analyzed in this paper by utilizing the theory of characteristic modes (TCM). Two eigenmodes, one from the chassis (0.5λ dipole mode) and the other one from the bezel (1λ-perimeter mode), are merged by a monopole exciter to broaden the antenna bandwidth below 1 GHz. A new eigenmode from the bezel (1.5λ-perimeter mode) is also exploited to achieve multiple-input multiple-output (MIMO) performance. The characteristics of the antenna are verified with an experimental prototype and measurements. The measured input reflection bandwidths from the two ports are 263 MHz (742-1005 MHz) and 93 MHz (863-956 MHz), respectively. The port isolation is more than 7.4 dB across the whole band of interest. Finally, the monopole exciter, which excites two eigenmodes in the low-frequency band, is modified to provide more resonances in the upper frequency band, providing coverage in the range of 1715-2060 MHz and 2280-2710 MHz.

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KW - multifrequency antennas

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MIMO mobile handset antenna merging characteristic modes for increased bandwidth

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