Telefonaktiebolaget Lm Ericsson (publ)

Powerwave Technologies Sweden Ab

Filtronic Wireless Limited

Torbjörn Lindh

John David Rhodes

Rune Johansson

Bosse Franzon

Jan-Erik Lundberg

Tord Liljevik

Per-Anders Arvidsson

Claudia Muñiz Garcia

Olov Ekervik

Claudia Muniz Garcia

Jan-Erik Lundeberg

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

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.

An antenna control system in which various antenna elements in a vertical row are coupled by fixed transmission lines to a central feeding point for a common signal. Adjustment of the phase of the common signal is achieved by means of a linearly movable slide having dielectric body portions influencing the signal velocity along said fixed transmission lines. Further, an electrical motor is used for linearly displacing said movable slide with said dielectric body portions.

Antenna control system

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Huddinge, Sweden

Torbjörn Lindh