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A Tunable Bandstop Resonator Based on a Compact Slotted Ground Structure

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4 Author(s)
Xiao-Hua Wang ; Univ. of Electron. Sci. & Technol. of China, Chengdu ; Bing-Zhong Wang ; Hualiang Zhang ; Kevin J. Chen

A new slotted ground structure featuring compact size and spurious-free passband in the context of microstrip lines is proposed. The compactness of the new structure originates from the lengthened coupling gap in the ground. The spurious-free response in a wide passband is a result of combining both narrow and wide slots in the new structure, which effectively forms a stepped-impedance slot resonator. Compared to the previously proposed dumbbell- and H-shaped defected ground structure, over 40% size reduction can be realized in the new structure. The new structure also provides flexibilities in introducing additional functionalities to the bandstop resonators. By embedding varac- tors in the slotted ground structure, tunable bandstop resonators can be implemented and 13% tuning range centered at 2.36 or 2.67 GHz have been obtained.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:55 ,  Issue: 9 )