A power amplifier includes a two-dimensional matrix of NM active cells formed by stacking main terminals of multiple active cells in series. The stacks are coupled in parallel to form the two-dimensional matrix. The power amplifier includes a driver structure to coordinate the driving of the active cells so that the effective output power of the two-dimensional matrix is approximately NM the output power of each of the active cells.

The power amplifier circuit includes an amplifier element, a transmission line transformer (TLT) circuit including a first, second and third line, and a switching circuit including a first, second, and third terminal. One end of the first line is coupled to an output terminal of the amplifier element, and the other end of the first line is coupled to one end of the second line. The other end of the second line is coupled to the terminal. One end of the third line is coupled between the one end of the first line and the output terminal of the amplifier element. The other end of the third line is coupled to the terminal. The switching circuit includes a first switch provided between the terminal and ground and a second switch provided between the terminal and ground.

A power amplifier includes a two-dimensional matrix of NM active cells formed by stacking main terminals of multiple active cells in series. The stacks are coupled in parallel to form the two-dimensional matrix. The power amplifier includes a driver structure to coordinate the driving of the active cells so that the effective output power of the two-dimensional matrix is approximately NM the output power of each of the active cells.

A spatial power-combining device and an antenna structure designed for high efficiency, high frequency, and ultra-wide bandwidth operation. The antenna structure may include a signal conductor and a ground conductor that are entirely separated by air. A spatial power-combining device may include a plurality of amplifier assemblies including multiple output antenna structures and an output coaxial waveguide section configured to concurrently combine signals received from each output antenna structure of the plurality of amplifier assemblies. The plurality of amplifier assemblies may also include multiple input antenna structures and an input coaxial waveguide configured to provide an input signal concurrently to each input antenna structure of the plurality of amplifier assemblies.

Apparatus and methods for quadrature combined Doherty amplifiers are provided herein. In certain embodiments, a separator is used to separate a radio frequency (RF) input signal into a plurality of input signal components that are amplified by a pair of Doherty amplifiers operating in quadrature. Additionally, a combiner is used to combine a plurality of output signal components generated by the pair of Doherty amplifiers, thereby generating an RF output signal exhibiting quadrature balancing.

A spatial power-combining device and an antenna structure designed for high efficiency, high frequency, and ultra-wide bandwidth operation. The antenna structure may include a signal conductor and a ground conductor that are entirely separated by air. A spatial power-combining device may include a plurality of amplifier assemblies including multiple output antenna structures and an output coaxial waveguide section configured to concurrently combine signals received from each output antenna structure of the plurality of amplifier assemblies. The plurality of amplifier assemblies may also include multiple input antenna structures and an input coaxial waveguide configured to provide an input signal concurrently to each input antenna structure of the plurality of amplifier assemblies.

Spatial power-combining devices and, in particular, spatial power-combining devices with filtering elements are disclosed. A spatial power-combining device includes a plurality of amplifier assemblies and each amplifier assembly includes an input antenna structure, an amplifier, an output antenna structure, and a filtering element. A filtering element may be an integral single component with an input signal conductor of the input antenna structure or an integral single component with an output signal conductor of the output antenna structure. In some aspects, a filtering element may be an integral single component with both the input signal conductor and the output signal conductor.

Spatial power-combining devices with increased output power are disclosed. A spatial power-combining device includes a plurality of amplifier assemblies and each of the amplifier assemblies includes a plurality of amplifiers separately coupled to a plurality of antennas. An amplifier assembly includes a first amplifier sub-assembly and a second amplifier sub-assembly. The first amplifier sub-assembly includes a first amplifier, a first input antenna structure coupled to the first amplifier, and a first output antenna structure coupled to the first amplifier. The second amplifier sub-assembly includes a second amplifier, a second input antenna structure coupled to the second amplifier, and a second output antenna structure coupled to the second amplifier.

Antenna waveguide transitions for solid state power amplifiers (SSPAs) are disclosed. An SSPA includes a waveguide channel that is configured to propagate an input signal, such as an electromagnetic signal, from an input port to a solid state amplifier for amplification. The waveguide channel is further configured to propagate an amplified signal from the solid state amplifier to an output port. Waveguide transitions to and from the solid state amplifier are bandwidth matched to the waveguide channel. Additionally, the waveguide transitions may be thermally coupled to the waveguide channel. The waveguide transitions may include antenna structures that have a signal conductor and a ground conductor. In this manner, the SSPA may have improved broadband coupling as well as improved thermal dissipation for heat generated by the solid state amplifier.

A stripline radial power combiner is provided. The stripline radial combiner comprises a first stripline level comprising N radial combiner arms coupled to a first common node; a second stripline level comprising a common port coupled to a second common node; wherein the first stripline level is mounted over the second stripline level; and wherein the first common node and the second common node are coupled by a conductive via through the first stripline level and the second stripline level.