Abstract
A novel three-pole low-pass filter is designed using metal-loaded slots etched in the ground plane, and low impedance microstrip line as microstrip capacitor. An equivalent circuit model of a defected ground structure (DGS) is applied to study the characteristics of DGS. Parameters of the model are extracted from the EM simulation results by matching it to a one-pole Butterworth low-pass filter. The theory is validated against the commercial Microwave Office. The new low-pass filter (LPF) is very compact and provides sharp transition band and a wide stop-band. Additional to the new mathematical method (natural logarithm function), a multilayer technique will be used to improve the compactness of the structure. Finally, the proposed structure is implemented, and the measurement results are found to be in good agreement with the simulation results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2561–2566, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26352
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