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PIER PIER B PIER C PIER M PIER Letters
2011-10-19
Low-Profile Directional Ultra-Wideband Antenna for See-through -Wall Imaging Applications
By
Fuguo Zhu,

    Dr. Fuguo Zhu

    School of electronics and information

    Northwestern Polytechnical University

    China

    Homepage

Steven Gao,

    Prof. Steven Gao

    University of Kent

    UK

    Homepage

Anthony Tung Shuen Ho,

    Dr. Anthony Tung Shuen Ho

    Department of Computing

    University of Surrey

    UK

    Homepage

Tim W. C. Brown,

    Dr. Tim W. C. Brown

    Center for Communications System Research

    University of Surrey

    UK

    Homepage

Jianzhou Li,

    Professor Jianzhou Li

    School of Electronics and Information

    Northwestern Polytechnical University

    China

    Homepage

Jia-Dong Xu

    Professor Jia-Dong Xu

    School of Electronic and Information

    Northwestern Polytechnical University

    China

    Homepage

Progress In Electromagnetics Research, Vol. 121, 121-139, 2011
doi:10.2528/PIER11080907
Abstract
A compact-size planar antenna with ultra-wideband (UWB) bandwidth and directional patterns is presented. The antenna can be fabricated on a printed circuit board (PCB). On one side of the PCB, it has a circular patch, and on the other side it has a slot-embedded ground plane with a fork-shaped feeding stub in the slot. Directional radiation is achieved by using a reflector below the antenna. To reduce the thickness of the antenna, a new low-profile antenna configuration is proposed. Three types of directional UWB antennas are analyzed. The distance between the antenna and the reflector is 12 mm (0.16 λ0, λ0 is the free space wavelength at the lowest frequency). In order to validate the design, a prototype is also fabricated and measured. Measured results agree well with the simulated ones. The measured results confirm that the proposed antenna features a reflection coefficient below -10 dB over the UWB range from 4.2 GHz to 8.5 GHz, a maximum gain around 9 dBi, a front-to-back ratio over 17 dB and pulse fidelity higher than 90% in the time domain. Thus it is promising for see-through-wall imaging applications.
Citation
Fuguo Zhu, Steven Gao, Anthony Tung Shuen Ho, Tim W. C. Brown, Jianzhou Li, and Jia-Dong Xu, "Low-Profile Directional Ultra-Wideband Antenna for See-through -Wall Imaging Applications," Progress In Electromagnetics Research, Vol. 121, 121-139, 2011.
doi:10.2528/PIER11080907
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