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This paper proposes a new type of compact evanescent-mode waveguide filter composed of planar dual-behavior resonators, which can produce multiple transmission zeros without any cross-coupling structures. The introduction of the planar resonators working in the evanescent-mode waveguide makes the length of the interval between the resonators much shorter than one-quarter guided wavelength, thereby...
This paper proposes a novel coaxial-excited waveguide filter, of which the resonator is a new planar resonator called the frequency selective surface (FSS). The new FSSs located at the input and output ports are directly excited by the coaxial line. In a conventional approach, the transition from TEM mode to TE10 mode is done by the coaxial probe located at the position of a quarter guided wavelength...
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