A Reconfigurable Filter Using Defected Ground Structure for Wideband Common-Mode Suppression
- Resource Type
- article
- Authors
- Zhibin Zeng; Shengjian Jammy Chen; Christophe Fumeaux
- Source
- IEEE Access, Vol 7, Pp 36980-36990 (2019)
- Subject
- Reconfigurable filter
defected ground structures
common-mode suppression
varactor diode
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
- Language
- English
- ISSN
- 2169-3536
A wideband common-mode (CM) suppression reconfigurable filter is proposed for high-speed all-pass differential circuits. The filter adopts three varactor-loaded compact defected ground structures (DGSs) to achieve continuous reconfigurability in its operation frequency with a large CM suppression dynamic range in the bandwidth. The varactors play an important role in widening the accessible instantaneous bandwidth and miniaturizing the structure. The three DGS cells with a total area of 15 mm × 10 mm are implemented symmetrically under the differential lines, to obtain reconfigurable CM bandstop characteristics which can be continuously adjusted from 1.8 to 8.1 GHz. A coupled LC resonator equivalent model is developed to represent and analyze the proposed filter, which explains its operation principle and assists in accelerating the reconfiguration design method. A good agreement between full-wave simulations and measured results is demonstrated, which validates the proposed design.