Patent ID: 8922212
Filing Date: 2014-12-30
Classification: G01R

Abstract:
1. A method for optimizing the signal-to-noise ratio in a system comprising an array of two or more receiving antennas for receiving RF signals, each receiving antenna being connected, via a corresponding matching network, to a corresponding low-noise amplifier presenting an input impedance to the matching network, wherein each receiving antenna, the corresponding matching network and the corresponding low-noise amplifier comprise a receiving channel of the system, the method comprising the steps of: a) setting the input impedance in each receiving channel to a value specific for an optimisation procedure; b) receiving RF signals via the receiving antennas; c) measuring a power of each RF signal to obtain a power signal for each receiving channel; d) forming a superposed signal from the received RF signals, wherein the superposed signal is formed by weighted superposition of the power signals; e) modifying the matching networks of all receiving channels so as to find an optimum matching condition on the basis of the superposed signal, wherein the matching networks transform optimum impedances of the low-noise amplifiers, the optimum impedances providing optimum noise performance of the low-noise amplifiers; and f) re-setting the input impedance in each receiving channel to an original value.