Optimization of a Microstrip Tunable Bandpass Filter Design

In this paper, an optimization procedure of a microstrip tunable bandpass filter design is represented. The filter structure consists of parallel-coupled half-wavelength resonators and variable capacitors, which provide the required tuning range of the center frequency. The simulation results were obtained using ADS (Advanced Design System) software. The method based on ladder type prototype and ADS LineCalc were used to get the dimensions of microstrip lines. After bandpass filter synthesis the optimization procedure was realized to improve the filter characteristics. For this purpose, ADS tools were used too. Simulation results confirm efficiency of proposed optimization approach.