Telefonaktiebolaget Lm Ericsson (publ)

Optis Cellular Technology, LLC

Daniel Källberg

Rune Johansson

Bosse Franzon

According to the teachings presented herein, a reconfigurable filter apparatus includes at least first and second passive filter sections connected in parallel to yield a composite filter response. Each passive filter section has a respective passband response and at least one of the passive filter sections is a 'de-tunable' passive filter section. Each de-tunable passive filter circuit includes a detuning circuit operable to exclude the respective passband response of the de-tunable passive filter section from the composite filter response by detuning a resonator within the de-tunable passive filter section. 'Detuning' the resonator can be understood as short-circuiting, opening the resonator, or otherwise disabling it, such that the filter path is blocked. Advantageously, the resonator(s) that are selectively detuned in this manner is isolated from input and output ports of the de-tunable passive filter section with respect to frequencies outside of the respective passband response of the de-tunable passive filter section.

Reconfigurable filter apparatus

The present invention relates to an antenna system (), a method and an apparatus () for directing a received signal (RX), along selected signal path/paths (), such that the operation of any of the radio base stations () in the antenna system () depends on the selected signal path/paths (). The antenna system () is comprised of a filter combiner () connected to radio base stations () that are of different radio access networks. The apparatus () of the antenna system further comprises a duplex filter (), coupled to the filter combiner (), and adapted to receive/transmit signals of different access networks. The duplex filter () further comprises a transmitter filter () and two receiver filters (). The receiver filters (and) are further connected to a switch (), said switch () is adapted to direct the received signal along one or several selected signal paths () such that the operation of any of the radio base stations () is dependent on which signal path/paths that is/are selected.

Apparatus and a method for directing a received signal in an antenna system

The invention presents a filter combiner, in particular for mobile communications applications, adapted to be connected to an antenna (), comprising a first directional coupler (), connected to at least one first filter (), to an antenna branch (), to at least one second filter (), and to a first signal branch (), the combiner also comprising a second directional coupler (), connected to the at least one first filter (), to a second signal branch (), and to the at least one second filter (). Further, the first directional coupler () is adapted to be connected to the first signal branch () via at least one third filter ().

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Bromma, Sweden

Daniel Källberg