Channel Multiplexing
Bernard Piette, Daniel Pasquet · 2013
It is necessary to conceive equipment ad hoc, as passive as possible, and with minimal losses, that allows each channel to use the antenna as if the other channels did not exist. To do this it is necessary to dispose of two types of components: firstly, selective filters, cavities or band-pass, and afterwards a system of interconnection by means of lines, very often coaxial cables. This chapter discusses duplexer and combiner. Two most commonly-used types of duplexers are: the band-pass and the pass-reject. The combiner plays an essential role in the base stations of all the mobile radiotelephony networks. The typical combiner is that with a nodal point (star combiner), in which a certain number of cavities or band-pass filters are linked to a common point, that will be connected to the antenna, by coaxial cables of the same length modulo, the assembly of which is called a harness. Controlled Vocabulary Terms band-pass filters; base stations; coaxial cables; multiplexing; radio networks