Zhao, C.Fumeaux, C.Lim, C.2017-11-152017-11-152017IEEE Microwave and Wireless Components Letters, 2017; 27(1):22-241531-13091558-1764http://hdl.handle.net/2440/109622This letter presents a novel concept of band-pass filter realized with metal posts in folded substrate-integrated waveguide (FSIW) technology, together with an efficient specific design procedure. As a first step, it is shown that a particular dimension of the middle vane in the FSIW yields an equivalence to a dielectric-loaded unfolded rectangular waveguide. This equivalence is investigated by comparing the modal dispersion characteristics in both folded and unfolded structures. A direct comparison of the posts placed in the FSIW and in the equivalent unfolded waveguide then further confirms their similar characteristics. As a result, the classical mode-matching method (MMM), straightforwardly applied in the equivalent unfolded structure, can be used to efficiently design a post filter in FSIW technology. For illustration, the method is applied to realize a 5th-order Chebyshev band-pass post FSIW filter with a center frequency of 7GHz and a fractional bandwidth of 5.71%. The viability and efficiency of the design approach is successfully validated by finite-element simulations and measurements.en© 2017 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.Band-pass filter; Chebyshev filter; folded substrate-integrated waveguide (FSIW)Journal article003006210510.1109/LMWC.2016.26300040003937953000082-s2.0-85008450589283324Fumeaux, C. [0000-0001-6831-7213]Lim, C. [0000-0002-2463-9760]