Design of narrow-band 2.4 – 2.5 GHz notch filter using various materials

This paper deals with design, simulation and measurement of narrow-band notch filter from 2.4 GHz to 2.5 GHz using five dielectric materials with various dielectric constants (glass microfiber, ceramic reinforced PTFE, hydrocarbon or epoxy based material). This paper presents filters based on microstrip line structure with half wavelength L - resonators and bandstop characteristic. Various dimensions of each structure were designed due to characteristic of used dielectrics, characterised by dielectric constant ε_r. The scattering parameters at various frequencies are investigating by modelling this structure with linear network analyses and electromagnetic simulation provides by Ansoft Designer simulating tool from ANSYS and measurement was done by VNA (Vector Network Analyzer). This article presents results of simulation and real measurement of scattering parameters of designed microstrip line structure. This paper refers how used dielectric materials (Rogers RO3003C, Rogers RO4003C, RT/duroid 5880, RT/duroid 6010LM and FR4) influence quality of designed notch filter and which of used material is the most suitable for purpose of high frequency filter using microstrip transmission lines.