Resonant-Cavity RF Power Combiner for Cooling and Bandwidth
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Solution Overview
Problem
Existing RF power combiners and dividers face challenges in achieving compact design, efficient cooling, and maintaining high bandwidth at higher frequencies and power levels, particularly due to physical limitations of resistors and heat dissipation issues.
Innovation Solution
A compact RF power combiner design featuring a grounded resonant cavity with transmission lines connected to input ports and grounded resistors outside the cavity, allowing for efficient cooling and a larger bandwidth, using a cylindrical or parallelepiped resonant cavity with coupling portions and optionally ferrite rings for further compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional Wilkinson combiner design is used, then in-phase power division and combining is achieved, but physical limitations of resistors prevent high power levels and high frequencies
Solution Approach 1:
The patent extracts the resistors from the traditional Wilkinson combiner structure and replaces them with resonant cavities that provide the necessary resistive loading function. This extraction allows the use of high-power resonant cavities instead of limited-resistor elements, enabling high power handling while maintaining the combiner's electrical performance.
Solution Approach 2:
The patent changes the physical and electrical parameters of the combiner by using resonant cavities with specific Q-factors and impedance characteristics. The resonant cavities are designed with parameters (quality factor, dimensions, loading) that enable them to function as high-power resistive elements, fundamentally changing the parameter regime from low-power resistors to high-power resonant structures.
2Power
If Gysel combiner design is used, then high power handling capability is achieved, but device size becomes large and cooling requirements increase
Solution Approach 1:
The patent merges the functions of the resonant cavities to serve dual purposes: they provide the necessary resistive loading for power dissipation and simultaneously act as the combining network structure. This merging eliminates the need for separate large-scale heat dissipation structures and reduces the overall volume compared to traditional Gysel combiners.
Solution Approach 2:
The resonant cavities perform multiple functions simultaneously: they provide resistive loading, enable power dissipation, contribute to the combining network functionality, and serve as the structural framework. This multi-functionality reduces the number of separate components needed, thereby reducing overall device volume while maintaining high power handling capability.
3Adaptability or versatility
If quarter-wave transformers are used for signal splitting, then in-phase output signals are achieved, but bandwidth is limited and performance degrades outside narrow frequency ranges
Solution Approach 1:
The patent uses resonant cavities with adjustable loading and coupling parameters that can be dynamically optimized for different frequency conditions. The resonant structures provide broader frequency acceptance compared to fixed quarter-wave transformers, allowing the combiner to maintain performance across wider bandwidths while reducing sensitivity to precise manufacturing tolerances.
4Reliability
If resistors are placed directly between output ports, then isolation is provided, but heat concentration causes temperature rise and reduces durability
Solution Approach 1:
The patent extracts the resistors from direct placement between output ports and replaces them with resonant cavities that provide the isolation function. The resonant cavities distribute heat generation across their volume and provide better thermal pathways, preventing the concentrated temperature rise that occurs with direct resistor placement while maintaining the necessary isolation performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves a more compact and efficient RF power combiner with improved cooling capabilities and broader bandwidth, suitable for higher power levels and frequencies, while maintaining performance.
Implementation Method 1
a grounded resonant cavity inside which are arranged N transmission lines
Implementation Method 2
N transmission lines, each of the N transmission lines having a first end connected to one of the N input ports
Implementation Method 3
an opposite second end connected to a grounded resistor arranged outside of the resonant cavity
Data Source
AI summary
An RF power combiner/divider that combines a plurality of inputs into a combined output and comprises an isolating circuit coupling the inputs to a common floating point is provided. The isolating circuit includes a grounded resonant cavity inside which transmission lines are arranged, each of the transmission lines having a first end respectively connected to one of the inputs and an opposite second end connected to a grounded resistor arranged outside of the resonant cavity. Each of the transmission lines is coupled to a coupling portion of the resonant cavity, one end of the coupling portion being connected to ground and an opposite end of the coupling portion forming the common floating point.