Multi-Planar MMIC Power Amplifier Layout for Compact Heat Dissipation
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Solution Overview
Problem
Solid state power amplifiers (SSPA) with traditional planar designs have a large footprint, making them unsuitable for compact applications such as mobile satellite communications systems, where space is limited and awkwardly shaped.
Innovation Solution
A solid state power amplifier design featuring a waveguide split block construction with multiple monolithic microwave integrated circuit (MMIC) modules arranged in multiple planes, utilizing an RF waveguide splitter, combiner, and a heat spreader with multiple surfaces to dissipate heat efficiently, allowing for a non-traditional shape and reduced footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If MMIC power amplifiers are mounted along a single plane to a planar heat sink structure, then the SSPA achieves minimal volume and efficient heat dissipation, but the footprint becomes unnecessarily large making it unsuitable for compact mobile applications
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of MMIC power amplifiers to a three-dimensional multi-planar configuration. Multiple planes of MMICs are mounted on a heat sink structure with improved fin geometry, allowing the system to utilize vertical space rather than expanding horizontally. This dimensional change reduces the footprint area while maintaining adequate heat dissipation capacity through the enhanced thermal structure.
Solution Approach 2:
The heat sink structure is segmented into multiple planes or levels, with MMIC power amplifiers distributed across these separate planes. The heat sink itself is divided into multiple fin sections that can dissipate heat from different planes simultaneously. This segmentation allows parallel heat dissipation paths, maintaining thermal efficiency while compacting the overall footprint.
2Area of stationary object
If multiple MMIC power amplifiers are arranged in a compact configuration, then the footprint is reduced for mobile applications, but heat dissipation becomes more challenging due to limited space
Solution Approach 1:
By arranging MMIC power amplifiers in multiple planes vertically stacked rather than spreading them horizontally, the patent reduces the footprint area while distributing heat sources across different elevation levels. This vertical arrangement allows heat to be dissipated through multiple surfaces facing different directions, improving thermal management in a compact volume.
Solution Approach 2:
The heat sink structure is designed with pre-configured fin geometry and multiple dissipation surfaces before the MMICs are mounted. The thermal pathways are established in advance through the multi-planar structure, ensuring that heat can be efficiently conducted and dissipated as soon as the MMICs are installed, without requiring additional space for thermal management components.
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 enables reliable and efficient RF signal amplification while reducing the overall size and footprint of the amplifier, making it suitable for installation in mobile transports like vehicles and aircraft.
Implementation Method 1
The heat spreader may be in thermal communication with the multiple MMIC power amplifier modules
Data Source
AI summary
A solid state power amplifier (SSPA) system may include a radio frequency (RF) input, an RF waveguide split block, multiple monolithic microwave integrated circuit (MMIC) power amplifier modules, and/or a heat spreader. An MMIC power amplifier module may include a backing, a board, at least one MMIC, and/or a cover. A method for dissipating heat within an SSPA may include receiving an RF signal, splitting the RF signal, amplifying multiple RF signals, combining the multiple RF signals, generating heat, and/or dissipating heat.