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

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4 Author(s)
Boutejdar, A. ; Dept. of Microwave & Commun. Eng., Univ. of Magdeburg, Magdeburg ; Omar, A. ; Batmanov, A. ; Burte, E.

In this paper, we propose a new compact DGS lowpass 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.

Published in:

German Microwave Conference, 2009

Date of Conference:

16-18 March 2009

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