Y.-Y. Bai

University of Electronic Science and Technology of China, Hua-yang, Sichuan, China

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Publications (9)4.49 Total impact

  • Y. Shang · S. Xiao · M.-C. Tang · Y.-Y. Bai · B. Wang
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    ABSTRACT: The authors investigate in this study using PIN attenuator diodes to reduce the radar cross-section (RCS) of a microstrip patch antenna. A simple design guideline and a useful loading scheme are developed. In the investigation, PIN diodes are equivalent to capacitances and resistances when diodes are reverse-biased and forward-biased, respectively. According to the magnitude distribution of the induced electric field under the patch for a specific incidence angle, the loading positions of PIN diodes are selected near to where the maximum electric field appears. First, three typical incident angles are separately considered. As a result, RCS reduction for the microstrip patch antenna is realised by utilising the variable resistance characteristic (energy dissipation) of PIN attenuator diodes. Secondly, the loading positions for that three incident angles are combined to realise RCS reduction over a large angular spatial region and within a wideband frequency range, and thus an electronically controllable low RCS status can be successfully realised. The proposed design guideline is demonstrated. It is worth mentioning that, by real-time adjusting the bias status of each PIN diode, the antenna realised gain as well as the relative bandwidth is well maintained when the antenna is at work.
    No preview · Article · Apr 2012 · IET Microwaves Antennas & Propagation
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    C. Liu · S. Xiao · Y.X. Guo · Y.-Y. Bai · M.-C. Tang · B.-Z. Wang
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    ABSTRACT: A single-fed compact circularly-polarised (CP) microstrip antenna is designed and experimentally demonstrated. By embedding the symmetric-slit in the radiation patch and protruding a pair of perturbation elements at the boundary of the centre square slot, the proposed antenna can obtain good CP performance with effective size reduction at a fixed frequency operation. Meanwhile, an impedance transformer is utilised for impedance matching.
    Preview · Article · Feb 2012 · Electronics Letters
  • S. Xiao · M.-C. Tang · Y.-Y. Bai · S. Gao · B.-Z. Wang
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    ABSTRACT: A defected ground structure (DGS) is used to suppress mutual coupling between elements in a microstrip array and eliminate the scan blindness in an infinite phased array. Two kinds of DGSs, namely back-to-back U-shaped and dumbbell-shaped DGSs, are analysed and compared. The analysis indicates that the back-to-back U-shaped DGS is better at suppressing propagation of surface waves in microstrip substrate. A two-element microstrip array with back-to-back U-shaped DGS is designed and the array characteristics against different element distances are studied. The results show that the degree of the mutual coupling suppression is increased when the element distance is reduced. However, compared with the traditional array, a higher gain and lower side lobes are obtained when a larger element spacing is selected. The scan blindness of an infinite microstrip phased array in E-plane is studied by simulation, and the calculation demonstrates that the scan blindness can be eliminated by applying a back-to-back U-shaped DGS to the infinite phased array.
    No preview · Article · Oct 2011 · IET Microwaves Antennas & Propagation
  • Y.-Y. Bai · S. Xiao · M.-C. Tang · C. Liu · B.-Z. Wang
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    ABSTRACT: A novel pattern reconfigurable patch antenna with a microstrip configuration is proposed. The antenna consists of a disc patch, a ring and eight radially symmetrically distributed microstrip monopoles. The patterns are reconfigured by shifting the states of the eight switches and eight reconfigurable states are available. Each conical pattern around the broadside of the antenna has a wide beam width in the azimuth plane and the eight reconfigurable patterns can cover continuously the space in the horizontal plane. The performance is very advantageous for smart antenna applications on future mobile terminals.
    No preview · Article · Oct 2011 · Electronics Letters
  • J.-R. Zhang · S.-Q. Xiao · X. Ding · M.-C. Tang · Y.-Y. Bai
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    ABSTRACT: A broadband monopole antenna working in UHF band is designed. A monopole antenna is cut into two parts. They are connected in series. This step improves the horizontal gain in the upper part of the operating band. A lossless LC ladder is then used to match the antenna impedance from 100 MHz to 400 MHz. The truncating position and circuit element parameters in the matching network are obtained using CST2009 optimization. Reflection coefficients of the truncated antennas both with and without the matching network are measured, showing good agreement with the simulation results. The following conclusions are drawn. The gain in the horizontal direction of the antenna with matching network is more than 0 dBi between 100 MHz and 350 MHz, and stays within -7~0 dBi from 350 MHz to 400 MHz. The simulated reflection coefficient S11 of the antenna is below 10 dB within 100 MHz and 400 MHz. The efficiency is over 60% within the operating band.
    No preview · Article · Jul 2011
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    ABSTRACT: A novel dual-band evolved magnetic metamaterial operating at X-band is proposed in the paper, which is compounded by evolved split ring resonators based on the principle of magnetic resonance. The dual frequencies can be easily adjusted due to its excellent performance of weak mutual coupling between the outer ring and the inner ring. Our work provides the helpful research ideas and design methods for multiple-band and wideband metamaterials.
    No preview · Article · Jun 2011
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    ABSTRACT: The principle of electric resonance metamaterial design is analyzed in detail, and the designed metamaterial (H-shaped metamaterial) is significantly miniaturized due to the lowering in the operating frequency from 12.21 to 5.46 GHz while keeping the dimensions unchanged, which was achieved by means of equivalent inductance and capacitance loading and grounding based on the equivalent circuit model. Our work not only provides a reference for miniaturizing different metamaterial configurations, but also points out specific research directions and effective ways in the design of metameterials with different characteristics and different operating frequencies.
    No preview · Article · Jul 2010 · Acta Physica Sinica -Chinese Edition-
  • Y.-Y. Bai · S. Xiao · B.-Z. Wang · S. Gao
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    ABSTRACT: In this paper, a linear phased array with pattern reconfigurable elements is studied to perform a two-dimensional pattern scanning. Compared with the traditional linear array, the new linear array can scan the patterns in two-dimensional directions, i.e. θ-direction and θ-direction. The results indicate that the main beam of the proposed array can continuously scan from θ=30° to θ=150 ° in the E-plane by adjusting the feed phases of reconfigurable elements and from θ=-50° to θ=50° in the H-plane by switching the elements operating states.
    No preview · Article · Feb 2010
  • S. Xiao · Y.-Y. Bai · B.-Z. Wang · S. Gao
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    ABSTRACT: In this paper, a linear phased array with pattern reconfigurable elements is studied to perform a scan angle extension of the array. The developed array can scan its main beam from -70° to 70° in its scanning plane. Compared with the traditional microstrip phased array, the scanning angle is extended remarkably.
    No preview · Article · Oct 2009