H. B. Zhu

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

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Publications (9)7.17 Total impact

  • 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
    IET Microwaves Antennas & Propagation 05/2007; · 0.84 Impact Factor
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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
    Microwave and Optical Technology Letters 03/2007; 49(5):1203 - 1204. · 0.59 Impact Factor
  • 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
    Microwave and Optical Technology Letters 09/2006; 48(10):1943 - 1945. · 0.59 Impact Factor
  • 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.
    IEEE Microwave and Wireless Components Letters 05/2006; · 1.78 Impact Factor
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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
    Microwave and Optical Technology Letters 11/2005; 47(4):392 - 394. · 0.59 Impact Factor
  • 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.
    Electronics Letters 10/2005; · 1.04 Impact Factor
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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
    Microwave and Optical Technology Letters 07/2005; 46(6):549 - 550. · 0.59 Impact Factor
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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
    Microwave and Optical Technology Letters 02/2005; 45(1):55 - 57. · 0.59 Impact Factor
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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
    Microwave and Optical Technology Letters 05/2004; 42(1):70 - 72. · 0.59 Impact Factor