Tunable Microwave Filter Design Using Defected Ground Structure

Saveridass, Jacinta (2012) Tunable Microwave Filter Design Using Defected Ground Structure. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Tunable bandstop filters using defected ground structure (DGS) was designed. The DGS section is obtained by etching the conventional ground plane. Transmission line with DGS has a characteristic of slow-wave propagation and bandstop with low loss in passband. To adjust the stopband, voltage controlled variable capacitor diodes (VVC) are equipped on the DGS section. The electrical method is proposed to provide tunable bandstop filters using DGS with VVC diodes. The center frequency of the filter is varied as the reverse bias voltage is changed. The stopband of the proposed filter expected to have wide tunable range. DGS unit can lead to deeper suppression and wider tunable bandwidth. This project is designed using ADS 2008. The design was created based on design specifications especially when designing the dimension of DGS structure. Two types of materials were discussed but RT/Duroid 5880 was used only as reference for the simulation. An active component which is varactor diode is used to obtain the tuning characteristic of bandstop filter. Good agreements between the simulated and measured results are expected.

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