Liquid-Cooled RF Termination Layout for Low Parasitic Heat Loss
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Solution Overview
Problem
Existing liquid-cooled RF terminations for calorimetric power measurement suffer from significant parasitic heat losses due to thermal paths from the internal resistor assembly to the termination body, leading to errors in power measurement.
Innovation Solution
The proposed liquid-cooled termination minimizes parasitic heat losses by novel placement of conductive, resistive, and insulating materials, ensuring that close to 100% of the RF power is converted to heat and transferred to the coolant, thereby enabling more accurate measurement of coolant temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional liquid-cooled RF terminations are used, then RF power measurement capability is provided, but parasitic heat losses occur through thermal paths from the internal resistor assembly to the termination body, leading to measurement errors
Solution Approach 1:
The termination body is segmented into thermally isolated regions: the resistor assembly is separated from the main termination body through strategic placement of insulating materials, creating distinct thermal zones that prevent parasitic heat transfer paths while maintaining electrical functionality
Solution Approach 2:
Insulating materials are introduced as intermediary elements between the internal resistor assembly and the termination body, acting as thermal barriers that block parasitic heat losses while allowing the device to function as a unified RF termination structure
2Measurement precision
If thermal efficiency is improved by minimizing parasitic heat losses, then measurement accuracy increases, but device complexity increases due to novel placement of conductive, resistive, and insulating materials
Solution Approach 1:
Different material properties are applied locally throughout the termination structure: conductive materials are placed where electrical connectivity is needed, insulating materials are positioned where thermal isolation is required, and resistive materials are located at specific points to manage heat generation and transfer, creating a functionally optimized heterogeneous structure
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 design achieves high thermal efficiency, reducing errors in RF power measurement and ensuring accurate power determination with improved accuracy and reduced thermal settling time.
Implementation Method 1
The RF load is in the coolant flowpath, such that heat generated by the RF power being applied to the RF load through the RF transmission line is convected to the coolant
Implementation Method 2
heat generated by the RF power being applied to the RF load through the RF transmission line is convected to the coolant while the coolant flows past the RF load
Data Source
AI summary
Disclosed is a liquid-cooled termination for calorimic RF power measurement having an RF transmission line, a coolant flowpath having a coolant input and a coolant output, and an RF load. The RF transmission line being electrical communication with said RF load having a resistor and a heat sink. The RF load is in the coolant flowpath, such that said heat generated by the RF power being applied to the RF load through said RF transmission line is convected to the coolant while said coolant flows past said RF load.