Abstract: A Doherty amplifier is provided with a lumped-element combiner that includes a first capacitor and an inductor. Should the inductor be coupled between an output terminal of the main amplifier and an output node of the Doherty amplifier, the first capacitor couples between an output terminal of the auxiliary amplifier and the output node. Conversely, if the first capacitor is coupled between the output terminal of the main amplifier and the output node, then the inductor couples between the output terminal of the auxiliary amplifier and the output node. A current scaling ratio of the Doherty amplifier ranges from 0.4 to 0.6 to enhance the bandwidth.

Abstract: In one embodiment, a filter includes two sets of dielectric resonators mounted in corresponding sets of metallic resonant cavities. Adjoining resonant cavities are separated by a wall that have an opening. Each dielectric resonator of the first and second sets has a post and a single connected pedestal and is mounted within its corresponding cavity so that the post contacts a first cavity wall and the pedestal is separated from the opposing wall by an air gap. Each dielectric resonator of the first set is oriented in a first direction, with its pedestal on the bottom. Each dielectric resonator of the second set is oriented in a second direction, opposite to the first, with its pedestal on the top. The filter's (i) source port couples with a resonator of the first set and (ii) load port couples with a resonator of the second set.

Abstract: In one embodiment, the cavity filter includes a housing defining a cavity, and at least one post projecting from a first interior surface of the housing towards a second interior surface of the housing. The first interior surface faces the second interior surface. The cavity filter further includes a thermo electric cooler disposed on the housing. The thermo electric cooler is configured to one of cool and heat at least a portion of the housing.

Abstract: In one embodiment, a filter includes two sets of dielectric resonators mounted in corresponding sets of metallic resonant cavities. Adjoining resonant cavities are separated by a wall that have an opening. Each dielectric resonator of the first and second sets has a post and a single connected pedestal and is mounted within its corresponding cavity so that the post contacts a first cavity wall and the pedestal is separated from the opposing wall by an air gap. Each dielectric resonator of the first set is oriented in a first direction, with its pedestal on the bottom. Each dielectric resonator of the second set is oriented in a second direction, opposite to the first, with its pedestal on the top. The filter's (i) source port couples with a resonator of the first set and (ii) load port couples with a resonator of the second set.

Abstract: In one embodiment, the cavity filter includes a housing defining a cavity, and at least one post projecting from a first interior surface of the housing towards a second interior surface of the housing. The first interior surface faces the second interior surface. The cavity filter further includes a thermo electric cooler disposed on the housing. The thermo electric cooler is configured to one of cool and heat at least a portion of the housing.

Abstract: A dielectric-loaded cavity resonator has a conductive (e.g., copper) box defining a cavity and a dielectric (e.g., ceramic) resonator mounted within the box. The dielectric resonator has a cylindrical dielectric post and first and second dielectric pedestals respectively connected to the ends of the post and having lateral dimensions greater than the diameter of the post. Insulating (e.g., PTFE) pads are mounted onto outer surfaces of the pedestals to provide air gaps between the pedestals and corresponding top and bottom walls of the box. In certain embodiments, the pedestals have rectilinear, 3D shapes completely or only partially covering the top and bottom walls of the cavity, while, in other embodiments, the pedestals have cylindrical shapes maximally or less than maximally covering the top and bottom walls of the cavity.