Dual-Band and Triple-Band Substrate Integrated Waveguide Filters With Chebyshev and Quasi-Elliptic Responses

By Xiaoping Chen, Ke Wu, Zhao-Long Li. IEEE transactions on microwave theory and techniques, 2007

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Compact Dual-Mode Triple-Band Bandpass Filters Using Three Pairs of Degenerate Modes in a Ring Resonator (2011, methodology): “Digital Object Identifier 10.1109/TMTT.2011.2123106 [11], parallel coupling topology [12], coupling-matrix method [13], inverter-coupled resonator [14], frequency transformation [15], and band-splitting technique [16].”
Compact Triple-Mode Filter Based on Quarter-Mode Substrate Integrated Waveguide (2015, unknown): “m(2) + n(2) (16) where μ = μ0μr, ǫ = ǫ0ǫr are the permeability and permittivity of the substrate, respectively.”
Resonance Characteristics of Substrate-Integrated Rectangular Cavity and Their Applications to Dual-Band and Wide-Stopband Bandpass Filters Design (2017, background): “The smaller frequency ratios can usually be implemented by inserting multiple transmission zeros (TZs) into a broad passband to split it into two subbands [3], [30] or by employing resonant modes adjacent to each other [31], [32], while the larger frequency ratios can be fulfilled by exploiting high”
Substrate Integrated Waveguide Filters: Design Techniques and Structure Innovations (2014, methodology): “The geometric configuration of (a) dual-band and (b) triple-band SIW filters as well as (c) and (d) their frequency responses [34].”
Design of Compact Tri-Band Bandpass Filters Using Assembled Resonators (2009, background): “Finally, a tri-band bandpass filter with two transmission zeros is designed and fabricated for demonstration.”