H04B 1/0057

Details of transmission systems, not covered by a single one of groups [CPC: H04B3/00] - [CPC: H04B13/00]; Details of transmission systems not characterised by the medium used for transmission {adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band}