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

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....

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2016-11, Vol.64 (11), p.4587-4594
Main Authors: Zeng, Yunjia, Chen, Zhi Ning, Qing, Xianming, Jin, Jian-Ming
Format: Article
Language:English
Subjects:
Antenna design
Antennas
Capacitors
Design analysis
Dispersion
Dispersion analysis
Dispersion curve analysis
equivalent circuit
Equivalent circuits
Integrated circuit modeling
Interrogation
loop antenna
Loop antennas
Magnetic fields
Magnetic resonance imaging
Modelling
Near field communication
near-field antenna
Periodic structures
Phase shift
Radio frequency
Radio frequency identification
Radiofrequency identification
segmented line
segmented loop antenna
Wave dispersion
Wireless power transmission
zero phase shift line (ZPSL)
ZPSL loop antenna
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Summary: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 2.5λ 0 , which is much larger than those reported with 2λ 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, nearfield communications, and magnetic resonance imaging.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2016.2600703