Liu Haiwen | East China Jiaotong University (original) (raw)

Address: Nanchang, Jiangxi, China

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Papers by Liu Haiwen

Research paper thumbnail of Novel Quasi-Elliptic Function Bandpass Filter Using Hexagonal Resonators with Capacitive Loading

Research paper thumbnail of Harmonic suppression with photonic bandgap and defected ground structure for a microstrip patch antenna

IEEE Microwave and Wireless Components Letters, 2005

Abstract This letter presents a microstrip patch antenna integrated with two-dimensional photonic... more Abstract This letter presents a microstrip patch antenna integrated with two-dimensional photonic bandgap (PBG) and one-dimensional defected ground structure (DGS) jointly in ground plane. It is demonstrated that application of both PBG and DGS eliminates the ...

Research paper thumbnail of Miniaturized Microstrip Lowpass Filter With Wide Stopband Using Suspended Layers and Defected Ground Structure (DGS

In this paper, a novel compact wideband rejection LPF using defected ground structure (DGS) is pr... more In this paper, a novel compact wideband rejection LPF using defected ground structure (DGS) is presented. The proposed LPF consists of hi-lo etched slots in ground metallic plane as defected ground structure(DGS) and of microstrip hi-lo structure, which corresponding to capacitance and Inductance on the top layer. The effect of the DGS slot on the characteristics of the investigated filter is examined. In this work we have proposed a simple method to realize a compact DGS LPF with good characteristics . In order to prove the efficiency of the method, a comparison is made between the new DGS LPF and conventional filters , which shows that the proposed filter with etched cells is enough to obtain better performance by suppressing ripples and a very large stop band. Measured results are found to be in good agreement with the simulation results.

Research paper thumbnail of Improvement of microstrip low pass filters' characteristics using an optimized number of new multi-ring defected ground structures

Microwave and Optical Technology Letters, 2007

A novel two square split ring resonators defected ground structure (DGS) is investigated for use ... more A novel two square split ring resonators defected ground structure (DGS) is investigated for use in low pass filters (LPF) design. An equivalent circuit and parametric study for the DGS are presented. The DGS is employed in a LPF to obtain very wide reject band. The measured results illustrated the excellent performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3074–3078, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22964

Research paper thumbnail of Triple-band high-temperature superconducting microstrip filter based on multimode split ring resonator

Research paper thumbnail of Novel Quasi-Elliptic Function Bandpass Filter Using Hexagonal Resonators with Capacitive Loading

Research paper thumbnail of Harmonic suppression with photonic bandgap and defected ground structure for a microstrip patch antenna

IEEE Microwave and Wireless Components Letters, 2005

Abstract This letter presents a microstrip patch antenna integrated with two-dimensional photonic... more Abstract This letter presents a microstrip patch antenna integrated with two-dimensional photonic bandgap (PBG) and one-dimensional defected ground structure (DGS) jointly in ground plane. It is demonstrated that application of both PBG and DGS eliminates the ...

Research paper thumbnail of Miniaturized Microstrip Lowpass Filter With Wide Stopband Using Suspended Layers and Defected Ground Structure (DGS

In this paper, a novel compact wideband rejection LPF using defected ground structure (DGS) is pr... more In this paper, a novel compact wideband rejection LPF using defected ground structure (DGS) is presented. The proposed LPF consists of hi-lo etched slots in ground metallic plane as defected ground structure(DGS) and of microstrip hi-lo structure, which corresponding to capacitance and Inductance on the top layer. The effect of the DGS slot on the characteristics of the investigated filter is examined. In this work we have proposed a simple method to realize a compact DGS LPF with good characteristics . In order to prove the efficiency of the method, a comparison is made between the new DGS LPF and conventional filters , which shows that the proposed filter with etched cells is enough to obtain better performance by suppressing ripples and a very large stop band. Measured results are found to be in good agreement with the simulation results.

Research paper thumbnail of Improvement of microstrip low pass filters' characteristics using an optimized number of new multi-ring defected ground structures

Microwave and Optical Technology Letters, 2007

A novel two square split ring resonators defected ground structure (DGS) is investigated for use ... more A novel two square split ring resonators defected ground structure (DGS) is investigated for use in low pass filters (LPF) design. An equivalent circuit and parametric study for the DGS are presented. The DGS is employed in a LPF to obtain very wide reject band. The measured results illustrated the excellent performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3074–3078, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22964

Research paper thumbnail of Triple-band high-temperature superconducting microstrip filter based on multimode split ring resonator

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