Multiband base station transceivers up to 6 GHz

Abstract: The request for more powerful mobile systems, enabling high mobile data rate and throughput in areas of different size and user density, is addressed by concepts for base station transceivers promoting concurrent multiband operation in radio bands below 6 GHz. Solutions to reduce the hardware complexity are elaborated for broadband or multiband capability by including data and frequency conversion, amplification and filtering. Digital to analogue converters providing RF sampling will allow soon for direct RF signal generation of multiple signal carriers up to 6 GHz and obviate the need for additional frequency conversion. Analogue to digital converters show a more restricted performance, currently up to around 4 GHz. A multiband power amplifier is a further essential component in a multiband RF chain. Supporting radio bands around 2.6, 2.8 and 3.5 GHz, it allows for a three band transmitter design. Filters showing two resonator frequencies per cavity enable components with reduced number of cavities, leading to significant volume reduction for dual band filters. These components allow for multiband transceiver design operating between 2.5 and 3.6 GHz.