About the possibility of metamaterials application at the band–pass microwave filters designing with superwide pass transmission band

Abstract

A band-pass filter with an extended operating frequency range based on composites - metamaterials is considered. Two design stages are presented, when, at the first stage, a two-stage microstrip filter on a resonator with a stepwise change in impedance, an SIR filter, is developed. At the second stage, the SIR-filter is remodified by adding to it a cell of mixed combined right-handed and left-handed transmission lines made of metamaterials. At lower frequencies, in the bandwidth, insertion loss is about 4 dB in the 3.1-4.2 GHz frequency range, due to the difficulty of meeting the impedance requirements of the mixed right-hand and left-hand transmission line, for all six phases throughout the ultra-wide frequency band is required. It was found that such methods are quite applicable for the design of other radio-electronic devices, in which impedance matching in an ultra-wide frequency band is required.