Power divider

A radio frequency (RF) system comprising one or more stages, each stage comprising one or more RF power dividers, each RF power divider comprising:

• an input port, an internal node and multiple output ports;
• a lumped element divider circuit connecting the internal node to the output ports, the divider circuit comprising:
• branch circuits, each comprising an inductor connecting the internal node to one of the output ports;
• and
• isolation circuits between the output ports, each isolation circuit comprising a resistor;
• and
• an impedance matching circuit connecting the input port to the internal node, the impedance matching circuit configured to selectively transmit or dissipate signal energy within a predetermined frequency band received from the input port;
• wherein, except for a last stage, output ports of each stage are connected to input ports of a next stage.

A radio frequency (RF) power divider comprising:

• a first node and two output ports;
• a divider circuit connecting the first node to the two output ports, the divider circuit comprising:
• two branch circuits, each comprising an inductor in series with a quarter-wave transmission line;
• and
• an isolation circuit between the two output ports, the isolation circuit comprising a resistor.

A phased-array system, comprising:

• an RF source that generates an RF source signal;
• an RF system that splits the RF source signal into multiple lower power RF signals, the RF system comprising one or more stages, each stage comprising one or more RF power dividers, each RF power divider comprising:
• an input port, an internal node and multiple output ports;
• a lumped element divider circuit connecting the internal node to the output ports, the divider circuit comprising:
• branch circuits, each comprising an inductor connecting the internal node to one of the output ports;
• and
• isolation circuits between the output ports, each isolation circuit comprising a resistor;
• and
• an impedance matching circuit connecting the input port to the internal node, the impedance matching circuit configured to selectively transmit or dissipate signal energy within a predetermined frequency band received from the input port;
• wherein, except for a last stage, output ports of each stage are connected to input ports of a next stage;
• a plurality of phase-shifting components coupled to the output ports of a last stage of the RF system, the phase-shifting components controllable to phase shift the multiple lower power RF signals;
• and
• a plurality of antenna elements coupled to the phase-shifting components.