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Design of multi-antenna feeding for MIMO terminals based on characteristic modes

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Author

Summary, in English

Conventional antennas in single-antenna terminals that resonate at frequencies lower than 1 GHz usually rely on the chassis as the main radiator. To effectively exploit chassis excitation for MIMO terminals, each of the multiple antennas is required to excite one distinct chassis mode. However, in today's terminals, there is typically only one chassis mode that can radiate efficiently at frequencies below 1 GHz. Fortunately, it has been shown that minor modifications in the chassis structure can cause more than one mode to resonate at these frequencies. Nevertheless, proper antenna feeding methods are needed to practically tap into these modes. In this paper, we propose a general technique to feed orthogonal chassis modes of a given conducting structure using the theory of characteristic modes. By separating a radiating structure into individual modal currents, the near field radiating properties are exploited for capacitive or inductive feeding without significant coupling to other orthogonal modes of radiation. As a proof of concept, we apply the technique to feed a modified terminal chassis that has two significant characteristic modes at 0.89 GHz.

Publishing year

2013

Language

English

Pages

182-183

Publication/Series

IEEE International Symposium on Antennas and Propagation, 2013

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Conference name

IEEE International Symposium on Antennas and Propagation, 2013

Conference date

2013-07-07 - 2013-07-13

Conference place

Lake Buena Vista, FL, United States

Status

Published

Project

  • Systematic Antenna Design Using the Theory of Characteristic Modes
  • EIT_ANTCHN Antenna-Channel Harmonization for Throughput Enhancement in Advanced Mobile Terminals
  • EIT_Optantsys Novel Antenna System Design Paradigm for High Performance Mobile Communications

Research group

  • Electromagnetic theory
  • Radio Systems

ISBN/ISSN/Other

  • ISSN: 1522-3965
  • ISSN: 1947-1491
  • ISBN: 978-1-4673-5317-5