Experimental Study of the Amplitude-Frequency Characteristics of a Waveguide Filter with a Resonant Waveguide-Slot Membrane at Subcritical Waveguide Frequencies

This paper presents a waveguide-coaxial system that allows you to implement a bandpass microwave filter that operates at frequencies below the critical (cutoff) frequencies (operates at subcritical frequencies) of a used rectangular waveguide. The results of experimental studies of the amplitude-frequency characteristics of the developed waveguide-coaxial system with a resonant waveguide-slotted membrane for a 35 × 15 mm cross-section waveguide are given: the resonant frequency of a band-pass filter was 2.05 GHz with a critical (cutoff) frequency of such a waveguide more than 4.5 GHz.