Open AccessFolded ESIW Bandpass Filter With Inverters Based on Short-Circuits Along the Folding Gap
Author(s) -
Marcos D. Fernandez,
Jose A. Ballesteros,
Angel Belenguer
Publication year - 2022
Publication title -
ieee access
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 127
ISSN - 2169-3536
DOI - 10.1109/access.2022.3198655
Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation
The benefits of empty substrate integrated waveguide (ESIW) are already well-known and contrasted in the literature, as well as the benefits of designing filters and other devices according to this technology. Recently, the Folded-ESIW (FESIW) has been presented, that halves the width of the original ESIW waveguide and maintains the cross-section area with good performance indexes and a similar bandwidth. This paper discusses three alternatives to design bandpass filters based on FESIW using irises, vertical cylindrical soldered posts or short-circuits along the folding gap. The most robust and effective way of manufacturing them is objectively determined. A prototype example is, for the first time, completely designed, manufactured and measured, with results of 3.71% fractional bandwidth at the central frequency of 14 GHz, 1.39 dB of filter insertion loss and Q-factor around 1300; this proves the feasibility and reliability of this new type of filters in comparison with other filters based on similar topologies.