Tunable Microstrip Bandstop Filter Design

Rohayu , Abdul Hamid (2009) Tunable Microstrip Bandstop Filter Design. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In communication system, wireless communication system environments will be constructed in term to bring together the benefits from various services. RF circuit as filter is design and be used for this environment to handle such different frequency and bandwidths. This project presents the design of tunable band stop filter. Then, continue by designing tunable filter that can be tuning in frequency range 2.34GHz-2.52GHz. The filter will reject frequencies between its lower and upper critical frequencies and passes all other. The step-impedance filter type was chosen in this design and varactor diode was selected for tuning element device. Varactor diodes are typically used in a reverse bias configuration compared to other diode. The design is simulate by using Microwave Office 2006 to simulate the S parameter which are the input return loss (8 11), output return loss (S22) and forward transmission (S21 ). The resonant frequencies will changes when the different value of voltage is supplied. When the voltage increase from OV to 30V, the resonant frequency will increase from 2.34 GHz to 2.52 GHz. The return loss is decrease from -11.09 dB to -20.77 dB when the number of filter element (N) increase from 2 till 4.

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