Microwave Filter based on Substrate Integrated Waveguide with Alternating Dielectric Line Sections

Abstract

[EN] A new topology of microwave filter based on sub- strate integrated waveguide (SIW) with alternating dielectric line sections is presented in this letter. The two alternating sections are waveguides without and with a dielectric material acting, respectively, as the inverters and the resonant sections of the pro- posed filter. This topology allows to easily design and manufacture compact filters with lower losses and higher rejection band than other available SIW realizations. For validation purposes, a prototype of a four-pole bandpass filter, based on alternating dielectric line sections, has been designed and manufactured, including successful experimental results.