PROJECT TITLE :
Design of compact balanced ultra-wideband bandpass filter with half mode dumbbell DGS
A brand new compact balanced ultra-wideband (UWB) bandpass filter using [*fr1] mode dumbbell defected ground structure (DGS) is presented. To understand the UWB response, the 'T’ shape multiple-mode resonator with short-ended stub is employed. To attain wideband common mode (CM) suppression and compact style simultaneously, the concept of 0.5-mode DGS is introduced in the 2 stacked microstrip layers. Afterwards, a balanced UWB filter is designed and measured for verifying the feasibility of the presented design methodology. The measured results match well with the expected results which indicate the proposed filter exhibits higher than −thirty dB CM suppression among the DM passband covering from 3.1 to 10.6 GHz.
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