MICROWAVE FILTER BUILT AROUND HETEROGENEOUS STUBS Russian patent published in 1997 - IPC

FIELD: microwave engineering; transceiving and instrumentation engineering for filtering off useful signal in passband and suppressing stray components of signal in rejection band. SUBSTANCE: filter has transmission line section 1, homogeneous quarter-wave and stepped cavities 2 and 3 shorted out on ends 4 and connected in parallel with section 1 on end 5 which are spaced quarter wave apart. Total number of cavities is to be greater than three and should be a multiple of three. Number of homogeneous cavities is twice as great as that of stepped ones. EFFECT: improved attenuation level and uniform attenuation in rejection band. 7 dwg