Evanescent Mode Cylindrical Cavity Filter

Model ID: 12015


An evanescent-mode cavity filter is resonant at a frequency lower than its original fundamental mode frequency. Evanescent mode resonance can be realized by creating a discontinuity or reactance inside the cavity.

The basic model was modified by the addition of a metal box at either end representing a housing. Inside a dielectric substrate and a microstrip line coupled into the cavity.

The electric field distribution shows that the dielectric tube inside the cavity does not distort the distribution significantly.

This model was built using the following:

RF Module

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