Multi-band filters on microstrip line

Abstract

This study is mainly based on the knowledge of microstrip line, filters and simulation software ADS. The main objective of this project is to design and simulate multi-band filters using Step Impedance Resonator (SIR) and Parallel Coupled Microstrip Line (PCML). The SIR is made of three sections with different impedance between the middle and the two sides, and the PCML is placed at the two sides to control the bandwidth of the multi-band filter. The SIR section and the PCML were extensively studied, and a dual-band filter has been investigated. By following the designed method of the previous study and properly adjusting the dimensions, a compact tri-band filter was designed with good response in all passband and stop band.