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Investigation of Diagonal Antenna-Chassis Mode in Mobile Terminal LTE MIMO Antennas for Bandwidth Enhancement
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Aalborg University, Denmark.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2015 (English)In: IEEE Antennas & Propagation Magazine, ISSN 1045-9243, E-ISSN 1558-4143, Vol. 57, no 2, 217-228 p., 7087389Article in journal (Refereed) Published
Abstract [en]

A diagonal antenna-chassis mode is investigated in long-term evolution multiple-input-multiple-output (LTE MIMO) antennas. The MIMO bandwidth is defined in this paper as the overlap range of the low-envelope correlation coefficient, high total efficiency, and -6-dB impedance matching bandwidths. Utilizing the diagonal mode analysis, the MIMO bandwidth of the collocated MIMO antennas is improved efficiently at the frequencies of lower than 960 MHz. This is realized through moving the three bandwidths to the same range without the degradation of impedance bandwidth and total efficiency. The physical mechanism of the mismatch of these three bandwidth ranges is also explained. Furthermore, the diagonal antenna-chassis mode is also studied for MIMO elements in the adjacent and diagonal corner locations. As a practical example, a wideband collocated LTE MIMO antenna is proposed and measured. It covers the bands of 740-960 and 1700-2700 MHz, where the total efficiencies are better than -3.4 and -1.8 dB, with <inf>ρe</inf> lower than 0.5 and 0.1, respectively. The measurements agree well with the simulations. Since the proposed method only needs to modify the excitation locations of the MIMO elements on the chassis, this method is valid for different types of symmetrical or asymmetrical MIMO antennas to improve the MIMO bandwidth.

Place, publisher, year, edition, pages
2015. Vol. 57, no 2, 217-228 p., 7087389
Keyword [en]
Antenna-chassis mode, mobile antennas, multiple-input-multiple-output (MIMO) systems
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-170279DOI: 10.1109/MAP.2015.2414751ISI: 000354952800021Scopus ID: 2-s2.0-84930202956OAI: oai:DiVA.org:kth-170279DiVA: diva2:828640
Funder
Swedish Research Council, 621-2011-4620
Note

QC 20150630

Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2017-12-04Bibliographically approved

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