Patent ID: 10158386

Abstract:
The present invention is a method for interference and noise reduction in systems with two signals paths and a phase filter, primarily applicable in telecommunications receiving systems with two antennas, radiolocation, measuring and medical equipments and other fields where there is a need to reduce undesired signals with different phases or amplitudes. The phase filter have two signals paths, where the input signals x and y are supplied to the voltage adders SX and SY, at the output of which output signals x′ and y′ are achieved. The differential output signals w2 and w2′ are also supplied to these voltage adders.The differential outputs signals w2 and w2′ are obtained by means of one or two power combiners by comparing the voltages received at the output of these power combiners to the average voltages on inputs. Signals supplied to inputs of power combiners are derived from a combination of input signals x and y and difference of voltages between these signals.For the assembly of two developed filters for a pair of signals of equal amplitude, damping of over 70 dB for angular differences at 25-180°, damping of over 20 dB for angular differences of +/−15° to +/−25° and damping of more than 40 dB for most signals of different amplitudes can be achieved.