A miniature bandpass filter using multilayered pcb technology

Self‐packaged miniature high‐order bandpass filter for wideband applications

“…Although the coupling matrix theory is usually adopted for a narrow‐band or middle band filter synthesizing, it is helpful to obtain the initial geometries of a wideband filter, which can be used in the optimizing process for obtaining a wide‐passband response. Hence, the coupling coefficients between the adjacent resonators are extracted using a commercial full‐wave electromagnetic simulator HFSS for obtaining the initial geometries of the proposed filter, as illustrated in the Figure , where the external quality factor is extracted as well.…”

“…In addition, as the frequency space among fundamental and superior resonating modes of the SIW resonator is relatively narrow, it is hard to design wideband, that is, more than 30% fractional bandwidth, filters using the SIW technique. Instead, quasi lump resonators, dissimilar quarter wavelength resonators or interdigital topologies are more adorable for the design of miniature wide bandpass filters.…”

“…This article reports a miniature wideband bandpass filter with self‐packaging character using a multilayered topology . To implement a wide factional bandwidth of 50%, the quarter‐wavelength stripline resonator is adopted in the design.…”