TCM Analysis of Defected Ground Structures for MIMO Antenna Designs in Mobile Terminals

Handle URI:
http://hdl.handle.net/10754/625808
Title:
TCM Analysis of Defected Ground Structures for MIMO Antenna Designs in Mobile Terminals
Authors:
Ghalib, Asim; Sharawi, Mohammad S.
Abstract:
In this paper, the theory of characteristic modes (TCM) is used for the first time to analyze the behavior of defected ground structures (DGS) when added to antenna designs. A properly designed DGS introduces currents opposite in direction to the original characteristic modes (CM) currents thus reducing mutual coupling. TCM is also applied to multiple-inputmultiple- output (MIMO) antenna systems to develop a systematic approach that can predict whether the isolation can be enhanced further or not. For this purpose two 4-element and one 2-element MIMO designs, i.e. monopole and planar inverted-F antennas (PIFA) are studied. The addition of different antenna elements affects the CM significantly as well as differently. Some of the CM excited on the antenna surface contribute to the coupling between the antenna ports that is why they can be classified as coupling modes. To improve the isolation, the DGS should be introduced at certain locations that blocks the coupling modes but at the same time does not affect the non-coupling modes. If their is no such location or the current on the surface of the chassis for coupling and non-coupling modes is approximately same, the isolation cannot be enhanced further. Using this approach, isolation was improved on an average by 11 dB in all the designs considered, giving the most isolation enhancement following a systematic way compared to other works.
Citation:
Ghalib A, Sharawi MS (2017) TCM Analysis of Defected Ground Structures for MIMO Antenna Designs in Mobile Terminals. IEEE Access: 1–1. Available: http://dx.doi.org/10.1109/access.2017.2739419.
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
IEEE Access
Issue Date:
14-Aug-2017
DOI:
10.1109/access.2017.2739419
Type:
Article
ISSN:
2169-3536
Sponsors:
This work was supported by the Deanship of Scientific Research (DSR) at KFUPM, Saudi Arabia, under project number KAUST-002.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorGhalib, Asimen
dc.contributor.authorSharawi, Mohammad S.en
dc.date.accessioned2017-10-04T14:59:17Z-
dc.date.available2017-10-04T14:59:17Z-
dc.date.issued2017-08-14en
dc.identifier.citationGhalib A, Sharawi MS (2017) TCM Analysis of Defected Ground Structures for MIMO Antenna Designs in Mobile Terminals. IEEE Access: 1–1. Available: http://dx.doi.org/10.1109/access.2017.2739419.en
dc.identifier.issn2169-3536en
dc.identifier.doi10.1109/access.2017.2739419en
dc.identifier.urihttp://hdl.handle.net/10754/625808-
dc.description.abstractIn this paper, the theory of characteristic modes (TCM) is used for the first time to analyze the behavior of defected ground structures (DGS) when added to antenna designs. A properly designed DGS introduces currents opposite in direction to the original characteristic modes (CM) currents thus reducing mutual coupling. TCM is also applied to multiple-inputmultiple- output (MIMO) antenna systems to develop a systematic approach that can predict whether the isolation can be enhanced further or not. For this purpose two 4-element and one 2-element MIMO designs, i.e. monopole and planar inverted-F antennas (PIFA) are studied. The addition of different antenna elements affects the CM significantly as well as differently. Some of the CM excited on the antenna surface contribute to the coupling between the antenna ports that is why they can be classified as coupling modes. To improve the isolation, the DGS should be introduced at certain locations that blocks the coupling modes but at the same time does not affect the non-coupling modes. If their is no such location or the current on the surface of the chassis for coupling and non-coupling modes is approximately same, the isolation cannot be enhanced further. Using this approach, isolation was improved on an average by 11 dB in all the designs considered, giving the most isolation enhancement following a systematic way compared to other works.en
dc.description.sponsorshipThis work was supported by the Deanship of Scientific Research (DSR) at KFUPM, Saudi Arabia, under project number KAUST-002.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.subjectTheory of characteristic modes (TCM)en
dc.subjectdefected ground structures (DGS)en
dc.subjectmultiple-input-multipleoutput (MIMO)en
dc.subjectisolationen
dc.subjectplanar inverted-F antenna (PIFA)en
dc.subjectchassis-mode antennasen
dc.titleTCM Analysis of Defected Ground Structures for MIMO Antenna Designs in Mobile Terminalsen
dc.typeArticleen
dc.identifier.journalIEEE Accessen
dc.contributor.institutionElectrical Engineering Department, King Fahd University for Petroleum and Minerals (KFUPM), Dhahran, 31261 Saudi Arabiaen
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