Design of low-pass filters using defected ground structure
- 8 August 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 53 (8), 2539-2545
- https://doi.org/10.1109/tmtt.2005.852765
Abstract
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 et al. is generalized to propose a method that can be applied in design N-pole LPFs for N/spl les/5. 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, teeor 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.Keywords
This publication has 14 references indexed in Scilit:
- Dual electromagnetic bandgap CPW structures for filter applicationsIEEE Microwave and Wireless Components Letters, 2003
- A spiral-shaped defected ground structure for coplanar waveguideIEEE Microwave and Wireless Components Letters, 2002
- A novel phase noise reduction technique in oscillators using defected ground structureIEEE Microwave and Wireless Components Letters, 2002
- Uniplanar one-dimensional photonic-bandgap structures and resonatorsIEEE Transactions on Microwave Theory and Techniques, 2001
- A 4.1 unequal Wilkinson power dividerIEEE Microwave and Wireless Components Letters, 2001
- A design of the low-pass filter using the novel microstrip defected ground structureIEEE Transactions on Microwave Theory and Techniques, 2001
- A novel 1-D periodic defected ground structure for planar circuitsIEEE Microwave and Guided Wave Letters, 2000
- A novel photonic bandgap structure for low-pass filter of wide stopbandIEEE Microwave and Guided Wave Letters, 2000
- A uniplanar compact photonic-bandgap (UC-PBG) structure and its applications for microwave circuitIEEE Transactions on Microwave Theory and Techniques, 1999
- Photonic bandgap structures used as filters in microstrip circuitsIEEE Microwave and Guided Wave Letters, 1998