Telefonaktiebolaget Lm Ericsson (publ)

Optis Cellular Technology, LLC

Filtronic Wireless Limited

Bosse Franzon

John David Rhodes

Rune Johansson

Jan-Erik Lundberg

Claudia Muñiz Garcia

Torbjörn Lindh

Daniel Källberg

Jan-Erik Lundeberg

Claudia Muniz Garcia

According to one or more embodiments, a directional filter assembly () comprises a multi-port filter circuit () for combining or separating signals in specified pass-bands and an isolated port () having a resistive load (), for absorbing out-of-band signals. The assembly further includes a reflective protection device () configured to protect the resistive load () from being overpowered by out-of-band signal power, based on being configured to reflect or not reflect the out-of-band signals in dependence on the level of out-of-band signal power. In at least one embodiment, the directional filter assembly is configured as a microwave transmission assembly, such as is used for combining signals from two or more base stations, for transmission from a common antennae assembly.

Microwave transmission assembly

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

A microwave transmission assembly comprising a combiner comprising first and second input ports and internal and external output a ports; the combiner being adapted to transfer a signal received at microwave frequency fat the first input port to the external output port and signals received at other frequencies to the internal output port; the combiner being further adapted to transfer a signal at a microwave frequency fat the second input port to the external output port and signals received at the other frequencies to the internal output port; a resistive load connected to the internal output port; and, a power dependent reflective load connected in series with the resistive load, the power dependent reflective load comprising a reactive element, the reactive element comprising an inductive component and a capacitive component and being adapted to resonate at a load frequency; the impedance of the capacitive component being adapted to drop when the incident microwave power received by the power dependent reflective load exceeds a power limit so switching the power dependent load from a low impedance state to a high impedance state.

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Bro, Sweden

Bosse Franzon