Abrégé
Filtering apparatus (1; 1') comprising distribution means (2, 7, 6; 9, 12), with an inlet port (21; 91) and a plurality of outlet ports (23, 22, 63; 92, 122), suitable to distribute inlet signals on at least a first assembly of said outlet ports plurality (23, 22, 63; 92, 122) and to further distribute signal reflected from said at least a first assembly on at least a second assembly of said plurality of outlet ports (23, 22, 63; 92, 122); filtering units (41, 42; 101, 102, 103), having first and second terminals, each filtering unit (41, 42: 101, 102, 103) being connected by said first terminals to outlet ports (23, 22, 63; 92, 122) of said distribution means (2, 7, 6; 9, 12) and suitable to carry out a filtering operation of a signal on said first terminals and on said second terminals and reflecting the remaining part of the signal; and combination means (5, 7; 11, 13, 14) with inlet ports (52, 53, 72, 73; 111, 131, 141) connected with second terminals of said filtering units (41, 42; 101, 102, 103) and an outlet port (54; 112, 141), said combination means (5, 7; 11, 13, 14) being suitable to combine on said outlet port (54; 112, 141) signals arriving from said second terminals of said filtering units (41, 42; 101, 102, 103).
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