Dual‐band bandpass filter using defected ground structure

Faculty of Science and Technology, University of Macau, Macao, Macau, Macao
Microwave and Optical Technology Letters (Impact Factor: 0.57). 11/2006; 48(11):2259 - 2261. DOI: 10.1002/mop.21929

ABSTRACT A new I-shaped defected ground structure (DGS) is used to relocate the microstrip resonator's second harmonic at the proximity of the fundamental passband to realize dual-band bandpass filter. This DGS is validated by a compact dual-band bandpass filter at 1.44 and 2.35 GHz with simulations and measurements. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2259–2261, 2006; Published online in Wiley InterScience ( DOI 10.1002/mop.21929

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    ABSTRACT: Dual-band bandpass filters using defected ground structures (DGS) are presented in this letter. Dual-band characteristics are obtained using the two resonant frequencies (modes) of a novel DGS. Two configurations of dual-band bandpass filters are presented in this article. Both the filters are designed, fabricated, and measured. Measured results show good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 475–479, 2009; Published online in Wiley InterScience ( DOI 10.1002/mop.24067
    Microwave and Optical Technology Letters 02/2009; 51(2):475 - 479. DOI:10.1002/mop.24067 · 0.57 Impact Factor
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    ABSTRACT: This paper proposes a simple approach for realizing a dual-band response bandpass filter (BPF) comprising two strip feed lines on the upper layer and a twin-spiral etched ground structure (EGS) on the lower layer. It is shown that by moving the two strip feed lines from the center of the EGS toward the upper-left and lower-right corners of the EGS unit, respectively, a 5.2-GHz passband can be excited in addition to the original 2.4-GHz passband. Moreover, by carefully controlling a dimension of the EGS, the second passband can be tuned in such a way as to realize a 2.4/5.7 GHz BPF. The experimental results show that the dual-band 2.4/5.2 GHz BPF has a good passband selectivity and an excellent out-of-band noise suppression capability. Consequently, the device provides an ideal solution for both Industrial-Scientific-Medical (ISM) and Wireless Local Area Network (WLAN) applications.
    Journal of Electromagnetic Waves and Applications 05/2009; 23(7):829-840. DOI:10.1163/156939309788355261 · 0.73 Impact Factor
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    ABSTRACT: This paper proposed a dual band 2.4GHz and 5.2GHz microstrip Bandpass filter with circular shaped defect ground structure (DGS) array, these two frequency band is controlled by adjusting the dimension of design with low insertion loss below -0.2dB in pass band, wireless LAN products operate on 2.4 GHz and operate on 5.2 GHz, bandwidth for 2.4 center frequency is 2.2GHz and at center frequency 5.2GHz, bandwidth is 400MHz.
    ICMARS International conference; 01/2011
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