New Low-Pass Filter Design Using Compensated Microstrip Capacitor and Coupled Meander Defected Ground Structure (DGS)

Conference: GeMiC 2009 - German Microwave Conference
03/16/2009 - 03/18/2009 at München, Germany

Proceedings: GeMiC 2009

Pages: 4Language: englishTyp: PDF

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Boutejdar, Ahmed; Omar, Abbas (Chair of Microwave and Communication Engineering, University of Magdeburg, Universitätsplatz 2, 39104, Magdeburg, Germany)
Batmanov, Anatoliy; Burte, Edmund (Chair of Semiconductor Technology, University of Magdeburg, Universitätsplatz 2, 39104, Magdeburg, Germany)

In this paper, we propose a new compact DGS low-pass filter with broad stop-band and low insertion loss in the pass-band. The philosophy of the structure behind this new microstrip low-pass filter is simple as it is composed of a pair of meander DGS-slots and open-stubs. The direct electromagnetic coupling and slow-wave effect have been employed to design the proposed filter using DGS and multilayer method. The optimized low-pass filter has shown higher compactness, broad stop-band and sharp transition characteristics. The design equations are derived using a lumped-element equivalent circuit model of a parallel L-C resonator. In order to validate the feasibility of the proposed design, a low-pass filter with 0.1-dB ripple is designed, fabricated, and measured. The experimental results have shown a good agreement with the simulation and analytical results.