H. B. Zhu

Nanjing University of Posts and Telecommunications, Nan-ching, Jiangsu, China

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Publications (12)11.08 Total impact

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    W.J. Lui · C.H. Cheng · H.B. Zhu
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    ABSTRACT: A new compact tapered microstrip monopole-like slot antenna for ultra-wideband (UWB) applications is proposed and studied both numerically and experimentally. The antenna is similar to the conventional microstrip monopole-like slot antenna; however, by introducing a tapered slot, UWB performance may be obtained. The dimensional parameters of the antenna and the corresponding current distribution on the conductor surface of the antenna are investigated numerically first. Based on numerical results, some prototypes are designed, fabricated and measured. The properties of the antenna, including return loss, radiation patterns and gain have been investigated experimentally again in order to confirm numerical results. Furthermore, the performance for the antenna when mounted in a handset is also investigated experimentally. As is reported, the operation bandwidth of the antenna is from 2.91 to 12 GHz, which is over 4:1. Relative omnidirectional and constant radiation patterns can be obtained over the entire bandwidth
    Full-text · Article · May 2007 · IET Microwaves Antennas & Propagation
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    J. Tao · C. H. Cheng · H. B. Zhu
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    ABSTRACT: A novel dual-band slot-antenna for WLAN applications is presented. The antenna is composed of two narrow slots fed by a microstrip-line. In order to increase the impedance bandwidth of a narrow slot and keep its small size, a kind of stepped-impedance (SI) slot is used. It has been investigated experimentally for its impedance bandwidth, radiation pattern, and gain over its operation frequency band. Result shows that the antenna has a 10% bandwidth from 2.25 to 2.53 GHz and a 15% bandwidth from 5.13 to 5.99 GHz. And a good radiation pattern and gain can be achieved over the frequency range. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1203–1204, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22395
    Preview · Article · May 2007 · Microwave and Optical Technology Letters
  • Guang Xing Jiang · H. B. Zhu · G. Q. Ji · W. Cao
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    ABSTRACT: An equivalent expressions for the structures singular value is proposed, leading to an alternative algorithm for its computation. The approach is based to the geometric properties of the m-form numerical range of certain tuples of matrices. Similar to previously considered schemes, the algorithm proposed is proved to give the correct value for block structures of size up to three. For larger sizes, insight is gained into the question of the possible gap between the structured singular value and its known upper bound
    No preview · Article · Feb 2007 · IEEE Microwave and Wireless Components Letters
  • G. X. Jiang · H. B. Zhu · W. Cao
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    ABSTRACT: A modified form of the time domain electric field integral equation (MFTD-EFIE) is proposed for determining the transient scattering from arbitrarily-shaped conducting bodies. In the analysis, the 2nd time derivative of the magnetic vector potential is approximated with a second-order central finite difference, and the time derivative of the electric scalar potential is averaged over time. The details of an implicit scheme for MFTD-EFIE are also outlined. Owing to the breaking of Courant condition, the method not only behaves efficiently but also yields stable transient responses. Numerical computations are carried out for quite a few conducting structures, such as plate, cube, hemisphere and cone, which demonstrate the accuracy and the efficacy of the proposed method.
    No preview · Article · Jan 2007 · Journal of Electromagnetic Waves and Applications
  • G.X. Jiang · H.B. Zhu · W. Cao
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    ABSTRACT: A novel technique for simultaneously extracting electromagnetic responses in time and frequency domains is presented. The method involving simultaneous generation of early time and low frequency information employs a nonlinear optimization scheme to find the optimum natural frequency so as to achieve the best performance. Numerical examples are presented to demonstrate the validity of the proposed method
    No preview · Article · Dec 2006 · IEEE Microwave and Wireless Components Letters
  • Source
    W. J. Lui · C. H. Cheng · H. B. Zhu
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    ABSTRACT: A novel, miniature balanced antipodal printed slot antenna for ultra-wideband applications is proposed. The antenna is fed by strip-line with a fork-like stub. By employing balanced antipodal structure, not only good omnidirectional performance but also compact size is achieved. Several properties of the antenna, such as return loss, radiation pattern, and gain, have been investigated numerically and experimentally. As is reported, the operation bandwidth of the antenna is from 2.95 to 12 GHz, which is about 4:1. Stable omnidirectional radiation pattern with good polarization purity and flat gain performances over the whole frequency range can be achieved. Furthermore, the size of the antenna is more compact than conventional printed slot antennas for ultra-wideband applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1943–1945, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21827
    Full-text · Article · Oct 2006 · Microwave and Optical Technology Letters
  • Source
    W.J. Lui · C.H. Cheng · H.B. Zhu
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    ABSTRACT: A novel frequency notched ultra-wideband (UWB) fractal printed slot antenna is proposed. The antenna is similar in configuration to a conventional microstrip-fed wide slot antenna, however, by introducing a Koch fractal slot, not only the size of the antenna is reduced significantly but also frequency notched function is achieved. Several properties of the antenna such as impedance bandwidth, frequency notched characteristics, radiation patterns and gain, have been investigated numerically and experimentally in detail. As will be seen, the operation bandwidth of the antenna is from 2.85 to 12GHz, in which a frequency notched band from 4.65 to 6.40GHz may be achieved, and relatively stable, omnidirectional radiation performance over the entire frequency range has also been obtained.
    Full-text · Article · May 2006 · IEEE Microwave and Wireless Components Letters
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    W. J. Lui · Z. Deng · C. H. Cheng · H. B. Zhu
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    ABSTRACT: A novel multilayer microstrip bandpass filter is proposed in this paper. The filter is constructed on two substrates with multislots on the common ground plane overlapping two microstrip stubs. The realization of these filters is confirmed both numerically and experimentally. From the calculated and measured results, it is observed that low insertion loss and a good matching characteristic in the passband can be achieved. Furthermore, the out-of-band rejection performance of the filter may be improved by varying the number and parameters of slots etched on the ground plane. As a result, this kind of filter may have wide applications in multiplayer microwave integrated circuits (MICs) or multilayer printed circuit board (PCB) design. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 392–394, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21178
    Full-text · Article · Nov 2005 · Microwave and Optical Technology Letters
  • Source
    W.J. Lui · C.H. Cheng · H.B. Zhu
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    ABSTRACT: A new frequency notched ultra-wideband microstrip slot antenna with a parasitic tuning stub is proposed. The antenna is similar in configuration to a conventional microstrip slot antenna; by introducing a parasitic open-circuit tuning stub, flexible frequency notched function is achieved. Several properties of the antenna, such as frequency notched function, antenna transfer function and gain, have been investigated. As is reported, the operation bandwidth of the antenna is 2.91-11.16 GHz, in which a frequency notched band of 5.10-5.85 GHz has been achieved. Furthermore, good ultra-wideband linear transmission performance over the entire operation frequency range has also been achieved.
    Full-text · Article · Oct 2005 · Electronics Letters
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    W. J. Lui · C. H. Cheng · Y. Cheng · H. B. Zhu
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    ABSTRACT: A novel ultra-wideband compact slot antenna fed by a grounded coplanar waveguide (CPW) is presented. This antenna is similar to the conventional CPW-fed slot antenna, and a forklike tuning stub and a polygonlike slot are designed in order to increase the operation bandwidth of the antenna. It is investigated numerically and experimentally for its impedance bandwidth, radiation pattern, and gain. The obtained impedance bandwidth of the antenna is from 2.89 to 9.19 GHz (with return loss of less than −9.5 dB), which is over 3.2:1, and good omnidirectional performance over the entire frequency range is achieved. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 549–550, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21046
    Full-text · Article · Sep 2005 · Microwave and Optical Technology Letters
  • Source
    W. J. Lui · C. H. Cheng · Y. Cheng · H. B. Zhu
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    ABSTRACT: A novel broadband multislot antenna fed by microstrip line is presented. By employing the multislot configuration, multimode resonances with close frequencies can be introduced. By designing the dimension of these slots and its feed network properly, the impedance bandwidth of the antenna can be drastically increased. The antenna's impedance bandwidth, radiation pattern, and gain over its operation frequency band are investigated experimentally. From the measured results, it is shown that the impedance bandwidth of the antenna is from 5.65 to 8.79 GHz, which is over 40% for return loss |S11| below −9.5 dB. The measured radiation pattern and gain at different frequencies of the antenna are presented and discussed, and it is shown that a relatively constant radiation pattern and gain over the entire frequency range can be achieved. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 55–57, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20721
    Full-text · Article · Apr 2005 · Microwave and Optical Technology Letters
  • C. H. Cheng · W. J. Lv · Y. Chen · H. B. Zhu
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    ABSTRACT: A dual-band strip-sleeve monopole antenna fed by a coplanar waveguide (CPW) is presented. The antenna is designed to operate at 900 and 1800 MHz in a vehicular telephone. It is printed on a dielectric substrate and may be integrated with a microwave circuit manufactured on the CPW. It has been investigated numerically and experimentally. The results show that the designed antenna can provide satisfactory performance for GSM/DCS systems, including a sufficiently wide-frequency band and a good radiation pattern. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 70–72, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20211
    No preview · Article · Jul 2004 · Microwave and Optical Technology Letters