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PIER PIER B PIER C PIER M PIER Letters
2008-08-05
Compact and Wideband 1-d Mushroom-Like EBG Filters
By
S. Moghadasi,

    Dr. S. Moghadasi

    Communications and Computer Research Center

    Ferdowsi University of Mashhad

    Iran

    Homepage

Amir Attari,

    Dr. Amir Attari

    Communications and Computer Research Center

    Ferdowsi University of Mashhad

    Iran

    Homepage

Mir Mirsalehi

    Dr. Mir Mirsalehi

    Electrical Engineering Department

    Ferdowsi University of Mashhad

    Iran

    Homepage

Progress In Electromagnetics Research, Vol. 83, 323-333, 2008
doi:10.2528/PIER08050101
Abstract
Anew wideband and compact bandstop filter using one dimensional (1-D) mushroom-like electromagnetic bandgap (EBG) structures is proposed in this paper. Although the proposed structure can not be fabricated as easy as defected ground structure (DGS) filters, it has several winning features such as more compactness, better characteristics and no backward radiation. A5-cell 1-D mushroomlike EBG filter is compared with 5-cell and 9-cell circular DGS filters. The 1-D mushroom-like EBG filter is found to be more compact as it requires fewer cells for the same characteristics and also as it has 0.44 times shorter cell length. The proposed EBG filter has a 10-dB bandwidth of 39% while the 5-cell and 9-cell DGS filters have 10-dB bandwidth of 20% and 27%, respectively. Also, the 1-D mushroom-like EBG filter is studied for various number of cells and compared with a two dimensional (2-D) structure. The simulated and measured results are found to be in good agreement.
Citation
S. Moghadasi, Amir Attari, and Mir Mirsalehi, "Compact and Wideband 1-d Mushroom-Like EBG Filters," Progress In Electromagnetics Research, Vol. 83, 323-333, 2008.
doi:10.2528/PIER08050101
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