PURPOSE: To prevent the degradation in electric characteristic and the variance of electric length by forming a coupling means in the input/output end of the filter connection side of a synthesizing device/branching filter and forming an aperture, to which the coupling means is inserted, on the synthesizing device/ branching filter connection side.
CONSTITUTION: Apertures 17 and 17 of channel filters 10 and 11 are inserted to fitting projecting parts 21 and 21 of a power synthesizing device 12, and they are fixed by screws 26. Coupling cables 26 and 25 as output side coupling means of filters 10 and 11 are formed in front ends of individual transmission lines 22 and 22 connected to synthesis transmission lines 23 and 23. Cables 25 are directly inserted into filters 10 and 11 from both fitting projecting parts 21. Therefore, it is unnecessary to provide connectors between the synthesizing device 12 and filters 10 and 11, and the contact resistance due to connectors does not exist. Consequently, the degradation in electric characteristic and unstableness and the variance of electric length are prevented.
WADA SHUICHI
TAKEHARA KOICHI
ARAKAWA JUJI
TANIZAKI TORU
