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Design of Low-Pass Filters Using Defected Ground Structure

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5 Author(s)
Jong-Sik Lim ; Div. of Inf. Technol. Eng., Soonchunhyang Univ., Chungnam, South Korea ; Chul-Soo Kim ; Dal Ahn ; Jeong, Yong-Chae
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A method to design low-pass filters (LPF) having a defected ground structure (DGS) and broadened transmission-line elements is proposed. The previously presented technique for obtaining a three-stage LPF using DGS by Lim is generalized to propose a method that can be applied in design N -pole LPFs for  N\leq5 . As an example, a five-pole LPF having a DGS is designed and measured. Accurate curve-fitting results and the successive design process to determine the required size of the DGS corresponding to the LPF prototype elements are described. The proposed LPF having a DGS, called a DGS-LPF, includes transmission-line elements with very low impedance instead of open stubs in realizing the required shunt capacitance. Therefore, open stubs, tee- or cross-junction elements, and high-impedance line sections are not required for the proposed LPF, while they all have been essential in conventional LPFs. Due to the widely broadened transmission-line elements, the size of the DGS-LPF is compact.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 8 )