HF Terminating Resistor Planar Layer Structure for Impedance Matching
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Solution Overview
Problem
HF terminating resistors with large resistance structures for high power applications suffer from unfavorable reflection factors in broadband applications due to long earthing connections, which hinder precise wave resistance matching and effective solder joint formation.
Innovation Solution
The earthing conductor is partially arranged on the resistor layer, allowing for a short and optimized connection that minimizes electrical interference while maximizing the surface for contacting, with a widened portion extending towards the resistor layer for improved soldering and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the earthing conductor is made long to ensure good solder joint formation, then the reliability of electrical connection is improved, but the wave resistance matching deteriorates due to increased electrical interference
Solution Approach 1:
The earthing conductor is arranged in a planar layer structure where it extends in the lateral dimension (along the substrate) rather than vertically, allowing the upper side to be fully available for contacting while maintaining a short effective electrical path to the earthing contact, thus resolving the contradiction between connection reliability and wave resistance matching
2Manufacturing precision
If the earthing connection is made short to improve wave resistance matching, then the impedance matching is improved, but the surface area available for solder joint formation is reduced
Solution Approach 1:
The earthing conductor utilizes the lateral dimension by extending along the substrate surface with its upper side fully exposed, maximizing the soldering surface area while keeping the vertical height (effective electrical path length) minimal, thus achieving both good impedance matching and adequate solder joint formation area
Solution Approach 2:
The earthing conductor is divided into functional segments: a short vertical connection portion for electrical connection to the resistor layer and substrate, and a long lateral extension portion with widened area for solder joint formation, allowing each segment to optimize its specific function
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 configuration enables precise impedance matching and efficient heat dissipation, reducing negative effects on wave resistance and allowing for a reliable solder joint, thereby enhancing the HF terminating resistor's performance across a broader frequency band.
Implementation Method 1
a resistor layer (10) for converting HF energy to heat
Data Source
AI summary
The invention relates to an HF terminating resistor having a planar layer structure which, on a substrate (16), comprises a resistor layer (10) for converting HF energy to heat, an input conductor (12) for supplying HF energy and an earthing conductor (14) for the electric connection to an earthing contact (22). The input conductor (12) is electrically connected to a first end (18) of the resistor layer (10) and the earthing conductor (14) is electrically connected to a second end (20) of the resistor layer (10) opposite the first end (18). On an earthing contact end of the layer structure, the earthing conductor (14) forms the topmost layer of the layer structure. The invention is characterized in that the earthing conductor (14) is at least partially arranged on the resistor layer (10).