Importance

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Abstract

An electrically steerable antenna arrangement comprising at least a first antenna function and a second antenna function, each antenna function comprising at least one antenna element, the antenna functions having at least one main radiation lobe that is electrically steerable, where each antenna function comprises at least one signal altering means arranged for altering the time characteristics and/or phase characteristics and/or frequency characteristics of a signal fed through the signal altering means, the electrically steerable antenna arrangement comprising a control unit arranged for feeding a signal comprising control information to the antenna functions via a control connection, the signal altering means being arranged to take certain settings in dependence of the control information, such that for certain settings of the signal altering means, a certain angular direction of said main radiation lobe in relation to an antenna reference plane is acquired. The electrically steerable antenna arrangement further comprises a first monitoring unit connected to the control connection, and a second monitoring unit connected to the antenna functions, the first monitoring unit being arranged to analyze the control information fed to the signal altering means and trigger a first alert via a first alert connection if there is a deviation which exceeds a first threshold, where furthermore the antenna functions are arranged to send signal information to the second monitoring unit regarding the resulting signal fed to said antenna elements, the second monitoring unit being arranged to analyze said signal information and to trigger a second alert via a second alert connection if there is a deviation which exceeds a second threshold.

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First Claim