Combiner for an rf power amplifier
AssigneeEmpower Rf Systems, Inc.
InventorsPaulo CORREA, Gerhard PETER
Life of this patent
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Abstract
Embodiments of the invention include a combiner for an RF amplifier comprising wiring and a transmission line transformer. The transmission line transformer may include a ferrite core having a hole defined therein; a coaxial cable having a first dielectric constant and routed through the hole of the ferrite core; and a stripline having a second dielectric constant and routed around the ferrite core. In some embodiments, an electrical length of the stripline is matched to an electrical length of the coaxial cable. The electrical length of the coaxial cable may be defined by the first dielectric constant and the electrical length of the stripline may be defined by the second dielectric constant.
Claims20
A combiner for an RF amplifier comprising:
- (a) a ferrite core for low frequency operation, the ferrite core having a hole defined therein;
- (b) a coaxial cable dimensioned to the highest operating frequency of the RF amplifier, the coaxial cable having a first dielectric constant, wherein the coaxial cable connects an RF output of at least two final stages in parallel to the output of the RF amplifier, and wherein the coaxial cable is routed through the hole of the ferrite core;
- (c) a stripline having a second dielectric constant, wherein the stripline connects the RF output of the at least two final stages in parallel to the output of the RF amplifier, wherein the stripline is routed around the ferrite core;
- and
- (d) wherein an electrical length of the stripline is matched to an electrical length of the coaxial cable, wherein the electrical length of the coaxial cable is defined by the first dielectric constant and wherein the electrical length of the stripline is defined by the second dielectric constant.
A combiner for an RF amplifier comprising:
- (a) a ferrite core having a hole defined therein;
- (b) a coaxial cable dimensioned to a highest operating frequency of the RF amplifier, the coaxial cable having a first dielectric constant, wherein the coaxial cable connects an RF output of at least four final stages in parallel to the output of the RF amplifier, and wherein the coaxial cable is routed through the hole of the ferrite core;
- and
- (c) a stripline having a second dielectric constant, wherein the stripline connects the RF output of the at least four final stages in parallel to the output of the RF amplifier, wherein the stripline is routed around the ferrite core.
A method for assembling a combiner for an RF amplifier comprising the steps of:
- disposing a heat sink defining a base of the combiner in an RF amplifier casing, the heat sink including a first groove;
- disposing a wiring layer within the first groove of the heat sink, the wiring layer having wiring thereon to connect the wiring layer with at least two final stages;
- disposing a ferrite core for low frequency operation within a hole in the wiring layer, the ferrite core having a longitudinal hole defined therein;
- positioning a coaxial cable through the longitudinal hole of the ferrite core, the coaxial cable dimensioned to the highest operating frequency of the RF amplifier, the coaxial cable having a first dielectric constant, wherein a first end of the coaxial cable connects to the wiring of the wiring layer and a second end the coaxial cable connects to an output of the combiner;
- and
- disposing a stripline having a second dielectric constant around the ferrite core so that a first end of the stripline connects to the wiring of the wiring layer and a second end of the stripline connects to ground;
- wherein an electrical length of the stripline is matched to an electrical length of the coaxial cable, wherein the electrical length of the coaxial cable is defined by the first dielectric constant and wherein the electrical length of the stripline is defined by the second dielectric constant.
Dependencies are inferred from the claim text.