Abstract: An anti-jamming circuit for null-steering jamming Radio-Frequency (RF) signals, comprising (1) an input circuit for receiving RF signals from multiple distinct antenna elements, and producing a plurality of signal groups each comprising a respective pair of filtered signals received from a respective pair of antenna elements each mapping them in one of the plurality of frequency bands, (2) a feedback circuit for adjusting the amplitude and/or the phase of the filtered signals of each signal group according to comparison between its pair of filtered signals until a difference between their amplitudes is minimized and their phases are opposite, aggregating the pair of adjusted signals of each signal group to produce a aggregated group signals, and aggregating the plurality of aggregated group signals to produce an overall aggregated signal, and (3) an output circuit for outputting the aggregated signal to a receiver adapted to extract data from the aggregated signal.

Abstract: A null steering adjuster in a stationary wireless network identifies the presence or absence of a current set of phase differences in a dataset. The dataset includes legitimate sets of phase differences detected between radio frequency signals received by multiple antennas from respective legitimate sources. The current set of phase differences is detected between radio frequency signals currently received by the antennas. When the current set of phase differences is absent from the dataset, a null is created in the antenna pattern of the antennas in the direction of the currently-received radio frequency signals. When the current set of phase differences is present in the dataset, the antenna pattern is maintained.

Abstract: An interference detector for detecting interference in Global Navigation Satellite System (GNSS) includes an RF splitter, multiple detectors and a comparator. RF splitter, splits a radio frequency (RF) input signal into multiple RF output signals which are provided to respective detectors. Each of the detectors includes a bandpass filter and a peak detector. The bandpass filter filters the RF output signal into a respective GNSS frequency band and the peak detector detects the peak level of the filtered RF signal. The comparator analyzes the peak detector outputs and identifies whether interference is present in the GNSS frequency bands by comparing the peak levels to respective thresholds. Based on this analysis, the comparator outputs a signal that indicates the presence and absence of identified interference in the GNSS frequency bands.

Abstract: An antenna null steerer in a wireless network determines the conformance of a radio frequency signal received by multiple antennas to the protocol of the wireless network. When the received radio frequency signal is conformant to the protocol, the current antenna pattern is maintained. When the received radio frequency signal is non-conformant to the protocol, nulls are iteratively generated in the antenna pattern until the RF signal becomes conformant to the protocol and/or the maximum number of nulls are present in the antenna pattern.

Abstract: An anti-jamming circuit for null-steering jamming Radio-Frequency (RF) signals, comprising (1) an input circuit for receiving RF signals from multiple distinct antenna elements, and producing a plurality of signal groups each comprising a respective pair of filtered signals received from a respective pair of antenna elements each mapping them in one of the plurality of frequency bands, (2) a feedback circuit for adjusting the amplitude and/or the phase of the filtered signals of each signal group according to comparison between its pair of filtered signals until a difference between their amplitudes is minimized and their phases are opposite, aggregating the pair of adjusted signals of each signal group to produce a aggregated group signals, and aggregating the plurality of aggregated group signals to produce an overall aggregated signal, and (3) an output circuit for outputting the aggregated signal to a receiver adapted to extract data from the aggregated signal.

Abstract: A phased array anti-jamming device, comprising a plurality (N) of antennas and a plurality of splitters connected to the antennas and adapted to split an RF stream received from the antennas. The phased array anti-jamming device further includes at least one digital signal processor adapted to digitally analyze a digital output of digital processing channels and to split the output into a plurality of digital down converted representations of respective analog outputs of a plurality of analog digital processing channels in a plurality of different frequencies and calculate at least one instructions selected from phase shift, amplification, and attenuation instructions for each one of the plurality of antennas per each one of the plurality of different frequencies. The phased array anti-jamming device further includes a plurality of phase shifter groups a plurality of group combiners and a main combiner adapted to sum outputs of the plurality of group combiners.

Abstract: An antenna structure includes an asymmetric antenna, an antenna feed and a ground plane connected to the asymmetric antenna via the antenna feed. The ground plane includes radials which radiate from the antenna feed. Each of the radials includes: a first conductive element having a first end and a second end, the first end being conductively connected to the antenna feed, a second conductive element conductively unconnected to the first conductive element and to the antenna feed, and a resistor connecting the second end of the first conductive element to the second conductive element.

Abstract: An interference detector for detecting interference in Global Navigation Satellite System (GNSS) includes an RF splitter, multiple detectors and a comparator. RF splitter, splits a radio frequency (RF) input signal into multiple RF output signals which are provided to respective detectors. Each of the detectors includes a bandpass filter and a peak detector. The bandpass filter filters the RF output signal into a respective GNSS frequency band and the peak detector detects the peak level of the filtered RF signal. The comparator analyzes the peak detector outputs and identifies whether interference is present in the GNSS frequency bands by comparing the peak levels to respective thresholds. Based on this analysis, the comparator outputs a signal that indicates the presence and absence of identified interference in the GNSS frequency bands.

Abstract: A null steering adjuster in a stationary wireless network identifies the presence or absence of a current set of phase differences in a dataset. The dataset includes legitimate sets of phase differences detected between radio frequency signals received by multiple antennas from respective legitimate sources. The current set of phase differences is detected between radio frequency signals currently received by the antennas. When the current set of phase differences is absent from the dataset, a null is created in the antenna pattern of the antennas in the direction of the currently-received radio frequency signals. When the current set of phase differences is present in the dataset, the antenna pattern is maintained.

Abstract: An antenna null steerer in a wireless network determines the conformance of a radio frequency signal received by multiple antennas to the protocol of the wireless network. When the received radio frequency signal is conformant to the protocol, the current antenna pattern is maintained. When the received radio frequency signal is non-conformant to the protocol, nulls are iteratively generated in the antenna pattern until the RF signal becomes conformant to the protocol and/or the maximum number of nulls are present in the antenna pattern.

Abstract: An antenna structure includes an asymmetric antenna, an antenna feed and a ground plane connected to the asymmetric antenna via the antenna feed. The ground plane includes radials which radiate from the antenna feed. Each of the radials includes: a first conductive element having a first end and a second end, the first end being conductively connected to the antenna feed, a second conductive element conductively unconnected to the first conductive element and to the antenna feed, and a resistor connecting the second end of the first conductive element to the second conductive element.

Abstract: A phased array anti-jamming device, comprising a plurality (N) of antennas and a plurality of splitters connected to the antennas and adapted to split an RF stream received from the antennas. The phased array anti-jamming device further includes at least one digital signal processor adapted to digitally analyze a digital output of digital processing channels and to split the output into a plurality of digital down converted representations of respective analog outputs of a plurality of analog digital processing channels in a plurality of different frequencies and calculate at least one instructions selected from phase shift, amplification, and attenuation instructions for each one of the plurality of antennas per each one of the plurality of different frequencies. The phased array anti-jamming device further includes a plurality of phase shifter groups a plurality of group combiners and a main combiner adapted to sum outputs of the plurality of group combiners.