Microstrip filters Based on Open Stubs and SIR for High Frequency and Ultra-Wideband Applications

This paper includes two new microstrip filter configurations for high frequency and Ultra-Wide Band applications. The first proposed is a composition of four parallel open-circuited stubs connected by optimized fractal-structured line. response combination three passing regions, namely low pass from 0.1 GHz to 3 GHz, band-pass 4.5 9 10.5 13 separated rejection regions GHz. Deep sharp reaching up -44.6 dB with 40 % fractional bandwidth (FBW) are observed good electrical performance. Furthermore, comparative table, the advantages this BSF in terms FBW, compactness insertion loss compared recently reported related studies. Secondly dual-band band implementing Stepped-Impedance resonator (SIR) modified H-shaped structure presented. designed operate region 3.58 15.38 21.65 wide stopband between 4.46 14.07 simulated measured results agreement. Compared its peers, compact size price allow application these configurations, while frequencies operation unlicensed spectrum, which popular high-speed communication. Keywords: Microstrip Filter, Pass, Stop, Open Stubs, SIR.