Characteristics of cross (bypass) coupling through higher/lower order modes and their applications in elliptic filter design

By Smain Amari, U. Rosenberg. IEEE transactions on microwave theory and techniques, 2005

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Resonance Characteristics of Substrate-Integrated Rectangular Cavity and Their Applications to Dual-Band and Wide-Stopband Bandpass Filters Design (2017, methodology): “When TE101 mode resonance in SIRC 1 or 3 is regarded as passband, TE201 resonance is viewed as spurious response and the coupling window with width wI is treated as output port, TZ1 will be produced [4].”
A 1.2–1.6-GHz Substrate-Integrated-Waveguide RF MEMS Tunable Filter (2011, background): “The position of the transmission zero depends on the relative coupling of the incident wave to the and modes, and can be controlled by adjusting the relative distance between input and output excitations [14].”
Substrate Integrated Waveguide Filter With Improved Stopband Performance for Satellite Ground Terminal (2009, methodology): “By this technique, planar and SIW structures can be integrated using various transitions between SIW and planar structures [e.g., such as microstrip and coplanar waveguide (CPW)].”
Substrate Integrated Waveguide Filters: Design Techniques and Structure Innovations (2014, background): “In addition, nonphysical cross coupling for additional FTZs can be generated when the input/ output is perpendicular to each other [11].”
A New Class of Waveguide Dual-Mode Filters Using TM and Nonresonating Modes (2010, methodology): “Finally, to show the potentialities of this class of filters, an eighth-order filter with eight transmission zeros has been designed, manufactured, and tested.”