Bandstop filter for very high frequency transmission lines and biassing circuit for a very high frequency transistor comprising this filter

摘要

A bandstop filter for very high frequency transmission lines having distributed constants, having several filtering elements each intended to prevent the transmission of a specific frequency band. The first filtering element is a quarter-wave filter, the second element an assembly of two transmission paths of a length such that the signals present at the outputs have opposite phases and cancel other, the third element being a quarter- wave filter, these elements being grouped such that they form an extremely compact filter which is little sensitive to proximity effects.