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Progress In Electromagnetics Research C
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IMPROVING FREQUENCY RESPONSE OF MICROSTRIP FILTERS USING DEFECTED GROUND AND DEFECTED MICROSTRIP STRUCTURES

By J. A. Tirado-Mendez, H. Jardon-Aguilar, R. Flores-Leal, E. A. Andrade-Gonzalez, and F. Iturbide-Sanchez

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Abstract:
In this work, the introduction of Defected Microstrip Structures and Defected Ground Structures is presented to improve the performance of a traditional stepped-impedance microstrip lowpass filter. The attenuation in the stop-band is enhanced by more than 15 dB and selectivity is increased, without modifying the insertion loss in the pass band. A comparison of characteristics in filters is made when the combination of Defected Ground and Defected Microstrip Structures, as well as when only the first one are used. A model of the Defected Microstrip Structure and the corresponding equations to obtain the equivalent lumped and distributed element values are also given.

Citation:
J. A. Tirado-Mendez, H. Jardon-Aguilar, R. Flores-Leal, E. A. Andrade-Gonzalez, and F. Iturbide-Sanchez, "Improving Frequency Response of Microstrip Filters Using Defected Ground and Defected Microstrip Structures," Progress In Electromagnetics Research C, Vol. 13, 77-90, 2010.
doi:10.2528/PIERC10011505

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