AESA Card Layout Without Wire Bonds for Stable RF Performance
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Solution Overview
Problem
Previous approaches to integrating Monolithic Microwave Integrated Circuits (MMICs) for active electronically scanned arrays (AESA) are costly and require extensive non-recurring engineering, with wire bonds causing electromagnetic coupling issues that affect RF performance.
Innovation Solution
The AESA card design features a printed wiring board with metal layers for RF, digital logic, and power distribution, incorporating MMICs without wire bonds and using a thermal spreader plate for cooling, reducing assembly costs and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonds are used to connect MMICs in AESA systems, then electrical connections can be established, but electromagnetic coupling issues occur that degrade RF performance
Solution Approach 1:
The patent removes wire bonds from the AESA card design entirely, replacing them with alternative connection methods that eliminate the electromagnetic coupling problem while maintaining electrical connectivity between MMICs and other components
Solution Approach 2:
The patent introduces an intermediary structure (such as a substrate or alternative interconnect method) to replace wire bonds, providing electrical connection without the harmful electromagnetic coupling effects that wire bonds produce in the RF environment
2Ease of manufacture
If traditional assembly methods are used for integrating MMICs, then connections can be made, but assembly costs and non-recurring engineering requirements increase significantly
Solution Approach 1:
The patent divides the AESA system into modular cards with standardized interfaces, allowing for easier assembly and reduced non-recurring engineering costs by enabling standardized manufacturing processes and simplifying integration of new technologies
Solution Approach 2:
The patent creates a universal card design that can accommodate different MMIC technologies and configurations through standardized interfaces and layouts, reducing assembly costs and engineering time by allowing the same manufacturing process to produce multiple variants
3Reliability
If active circuits are used to provide RF signal distribution and processing, then functional performance is improved, but heat dissipation requirements increase
Solution Approach 1:
The patent introduces a thermal spreader plate as an intermediary component between the active circuits and the heat sink, improving heat transfer efficiency and enabling better thermal management while maintaining the functional performance of active 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
This solution reduces assembly costs, simplifies integration of new technologies, minimizes electromagnetic coupling, and ensures consistent RF performance while effectively managing heat dissipation in AESA systems.
Implementation Method 1
heat-sink(s) are attached to each active circuit to dissipate the heat
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
In one aspect, an active electronically scanned array (AESA) card includes a printed wiring board (PWB) that includes a first set of metal layers used to provide RF signal distribution, a second set of metal layers used to provide digital logical distribution, a third set of metal layers used to provide power distribution and a fourth set of metal layers used to provide RF signal distribution. The PWB comprises at least one transmit/receive (T/R) channel used in an AESA.