Abstract: An electronic power divider for radio frequency signals, and an electronic system containing such electronic power divider, includes one or more inputs designed to be fed by an electromagnetic radio frequency signal having a predetermined wavelength; at least two outputs for the radio frequency signal, each of which is connected to the same input; electric paths adapted to connect each output to the corresponding input, and a system of selective variation of the electric impedance associated with each of the electric paths during the passage of the signal. The impedance variation system is adapted to vary the impedance associated with the paths discreetly between a lower and an upper value, and to simultaneously maintain the value of the impedance associated with two or more paths at least at the lower value.

Abstract: An electronic power divider for radio frequency signals, and an electronic system containing such electronic power divider, includes one or more inputs designed to be fed by an electromagnetic radio frequency signal having a predetermined wavelength; at least two outputs for the radio frequency signal, each of which is connected to the same input; electric paths adapted to connect each output to the corresponding input, and a system of selective variation of the electric impedance associated with each of the electric paths during the passage of the signal. The impedance variation system is adapted to vary the impedance associated with the paths discreetly between a lower and an upper value, and to simultaneously maintain the value of the impedance associated with two or more paths at least at the lower value.

Abstract: An antenna apparatus may include a reflective layer connected to a ground, one or more first antennas disposed on the reflective layer, wherein each first antenna includes a first active element and one or more first parasitic elements; one or more first switching devices, each associated with corresponding one of the one or more first parasitic elements in at least one of one or more first antennas, one or more second antennas disposed on the reflective layer, wherein each second antenna includes a second active element and one or more second parasitic elements, and one or more second switching devices, each associated with corresponding one of the one or more second parasitic elements in at least one of one or more second antennas. The first antennas operate at a first frequency. The second antennas operate at a second frequency different from the first frequency.