Extending Bandwidth of Antennas With Coupling Theory for Characteristic Modes

Jiang-Feng Lin; Qing-Xin Chu

doi:10.1109/ACCESS.2017.2761888

IEEE Access (Jan 2017)

Extending Bandwidth of Antennas With Coupling Theory for Characteristic Modes

Jiang-Feng Lin,
Qing-Xin Chu

Affiliations

Jiang-Feng Lin: School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China
Qing-Xin Chu: ORCiD; School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China

DOI: https://doi.org/10.1109/ACCESS.2017.2761888
Journal volume & issue: Vol. 5
pp. 22262 – 22271

Abstract

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Basing on the characteristic mode theory, this paper develops the concepts of source-mode (SM) couplings and mode-mode (MM) couplings, which characterized by the modal weighting coefficients and the inter-modal coupling coefficients, respectively. It is found that SM couplings could be adjusted by MM couplings when feeding configuration remains unchanged. Therefore, just by properly adjusting mode-mode couplings, we can reduce Q factor of an antenna at its center frequency and hence its bandwidth could be extended. A new time-saving optimization method based on controlling mode-mode couplings is also proposed. Two examples (one is lossless and the other one is lossy) are given and analyzed in detail to show how to control mode-mode couplings in order to reduce Q factor at the center frequency and hence enhance -10 dB bandwidth.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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