Filtering device for electromagnetic waves in a waveguide with symmetry around the rotational axis, and inserted pieces of rectangular waveguide

摘要

The field of the invention is that of the filtering of electromagnetic waves travelling in axisymmetric waveguides, in particular circular waveguides. …??The invention relates to a device for filtering electromagnetic waves travelling in a main axisymmetric waveguide element (41A, 41B) extending along an axis of symmetry (45), comprising at least one rectangular waveguide segment (42), inserted by way of substitution into the said main waveguide element (41A, 41B), each transition (44A, 44B) between the said main waveguide element (41A, 41B) and each of the said filtering segments (42) consisting of a metal wall substantially perpendicular to the said axis of symmetry (45), the number and the geometrical and/or dimensional characteristics of the said rectangular waveguide segments (42) being chosen so as to constitute a filter with predetermined filtering profile. …??The invention finds a favoured application in two-band filtering, for example for producing two-band and two-polarisation duplexers. …IMAGE…