Modeling and Characterization of Zero-Phase-Shift Lines and Optimization of Electrically Large ZPSL Loop Antennas for Near-Field Systems

Yunjia Zeng, Zhi Ning Chen, Xianming Qing, Jian Ming Jin

Research output: Contribution to journalArticle

Abstract

A methodology for modeling and characterization of a zero-phase-shift line (ZPSL) structure is presented, and a ZPSL-based electrically large loop antenna is optimized for near-field wireless systems. The ZPSL loop is first analyzed with a full-wave driven-mode solver to obtain the dispersion curve. An equivalent circuit model is then presented for characterizing the ZPSL structure. Based on the dispersion analysis, a design guideline is proposed for the ZPSL loop antenna to enlarge its interrogation zone, where a uniform magnetic field distribution is desired. A design example at 915 MHz shows that the perimeter of the ZPSL loop antenna with a desired uniform magnetic field distribution can be optimized up to $2.5\lambda -{0}$ , which is much larger than those reported with $2\lambda -{0}$ , achieving a 56% increase in the area of the interrogation zone. The proposed method can be applied in the antenna design for near-field wireless systems such as wireless charging, radio-frequency identification, near-field communications, and magnetic resonance imaging.

Original languageEnglish (US)
Article number7544610
Pages (from-to)4587-4594
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Volume64
Issue number11
DOIs
StatePublished - Nov 2016

Keywords

  • Dispersion analysis
  • ZPSL loop antenna
  • equivalent circuit
  • loop antenna
  • near-field antenna
  • segmented line
  • segmented loop antenna
  • zero phase shift line (ZPSL)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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