Design of Generalized Chebyshev Microwave Bandpass Filter Based on Suspended Stripline Structure (SSS)

摘要

This paper presents the technique of composite generalized Chebyshev bandpass filter (BPF) using suspended stripline structure (SSS) technology. The study involves the combination of lowpass filter (LPF) and highpass filter (HPF) to produce SSS bandpass filter with two transmission zeros at finite frequency. The bandpass filter produces wideband bandwidth from 3.1 GHz to 6 GHz with a return loss, S_(11) better than - 15 dB and insertion loss, S_(21) of around -0.1 dB. The design is simulated on a Roger Duroid RO4350 with a dielectric constant, ε_r of 3.48 and a thickness of 0.508 mm. The simulation performance results show promising results that could be further examined in future works during experimental works. This class of generalized Chebyshev highpass filter with finite transmission zeros would be useful in any RF/microwave communication systems particularly in wideband applications where the reduction of overall physical volume and weight as well as cost very important, while maintaining its excellent performance.