Non-Planar RF Power Amplifier Symmetric Heat Paths
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Solution Overview
Problem
Current solid state RF power amplifiers are limited in their ability to efficiently operate at microwave and millimeterwave frequencies with wide bandwidth and high power, necessitating improved designs for efficient operation and heat management.
Innovation Solution
A non-planar RF power amplifier design featuring multiple solid state sub-amplifier modules connected in parallel, with a housing that allows for identical signal paths and heat management through symmetric heat paths, along with flexible transmission lines and RF combiners/splitters with identical electrical paths to minimize loss and ensure efficient power amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solid state RF power amplifiers are designed for high power output, then power amplification capability is improved, but heat generation increases making heat management difficult
Solution Approach 1:
The amplifier is divided into multiple independent amplifier modules (first, second, third, and fourth modules) that can be arranged in a symmetric configuration. Each module processes a portion of the total power, distributing heat generation across multiple separated sources rather than concentrating it in a single location. This segmentation enables independent thermal management for each module.
Solution Approach 2:
The patent employs symmetric arrangement of amplifier modules around a central axis, creating a balanced thermal distribution pattern. The first and fourth modules are positioned symmetrically, as are the second and third modules, allowing heat to be distributed evenly in opposite directions. This symmetric design enables efficient heat dissipation pathways while maintaining balanced thermal characteristics.
2Power
If amplifier modules are arranged in parallel for high power output, then power amplification is improved, but signal path differences cause phase differences reducing efficiency
Solution Approach 1:
The amplifier modules are arranged symmetrically around a central axis with the first and fourth modules positioned symmetrically to each other, and the second and third modules positioned symmetrically. This symmetric configuration ensures that signal paths from opposite modules are equal in length and electrical characteristics, eliminating phase differences between parallel paths while enabling high power output through parallel operation.
3Volume of moving object
If compact amplifier design is used, then device size is reduced, but heat dissipation capability is limited
Solution Approach 1:
The amplifier modules are arranged in a three-dimensional symmetric configuration around a central axis rather than in a simple linear or planar arrangement. This spatial distribution in multiple dimensions allows compact packaging while maintaining adequate separation between heat-generating modules. The symmetric 3D arrangement enables heat to dissipate in multiple directions simultaneously, improving heat dissipation capability within a compact volume.
Data Source
AI summary
A power amplifier (power amplifier) having multiple solid state sub-amplifiers connected in parallel between the power amplifier input and the power amplifier output are described. The signal input to the power amplifier is provided to an RF splitter connected between the power amplifier input connector and the input of each of the sub-amplifiers. The RF splitter splits the input power from the signal input and provides the power to the sub-amplifier inputs through input electrical paths. The input electrical paths from the power amplifier input to the sub-amplifiers are substantially physically identical. Each of the sub-amplifiers drive an input of an RF combiner connected between the outputs of the sub-amplifiers and the output of the power amplifier. The RF combiner combines the output power from each of the sub-amplifiers through output electrical paths, and provides the combined power to the power amplifier output. The output electrical paths from the sub-amplifiers to the power amplifier output are substantially physically identical.