Analysis and Design Tunable Dual-band Bandpass Filter of a second-order Maximally Flat using Miniaturized Technique

This study presented an analysis and design of tunable dual-band bandpass filter using miniaturized technique. The miniaturized technique makes the weight and volume of the filter smaller. This design is based on a combination of parallel coupled lines of microstrip.A second-order low pass filter was designed by using mathematical equations. The low pass filter was transferred into a middle pass filter using these equations. Then by using tuning technique this filter was turned into a tunable dual-band bandpass filter.The used sublayer of RT-DURROID-5880 with ε_r=2.21 and loss tangent was 0.0009. The ADS software was used to do all the diagrams and simulations which lead to designing a double band filter with 1GHz bandwidth.

Keywords:

Bandwidth , dual-band filter , Miniaturized , Parallel Coupled , Tuning Technique