Impedance Matching Pattern for Millimeter-Wave Signal Reflection
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Solution Overview
Problem
Current semiconductor devices face difficulties in achieving high-speed data transmission beyond 40 GHz frequency due to signal reflection and deterioration, limiting their effectiveness in millimeter-wave frequency bands.
Innovation Solution
Incorporating an impedance matching pattern with a symmetric shape on the transmission line to reduce signal reflection and enhance transmission characteristics, allowing for high-speed data transmission with minimal signal deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional transmission line is used for millimeter-wave signal transmission, then the device structure remains simple, but signal reflection and deterioration occur at frequencies above 40 GHz, limiting transmission effectiveness
Solution Approach 1:
The patent applies local quality by introducing an impedance matching pattern with specific geometric features (protrusions and recesses) at particular locations along the transmission line. These localized structural modifications create regions with different impedance characteristics that progressively match the impedance between the circuit board and antenna, reducing signal reflection at the interface without requiring complete redesign of the entire transmission system.
Solution Approach 2:
The patent employs parameter changes by varying the impedance characteristics along the transmission line through the impedance matching pattern. The pattern includes protrusions and recesses that change the effective width and capacitance of the transmission line at different positions, creating a gradual impedance transition. This allows the transmission line to adapt its electrical parameters to match the antenna impedance, improving signal transmission effectiveness at millimeter-wave frequencies.
2Speed
If the transmission line operates at higher frequencies to achieve high-speed data transmission, then data transmission speed increases, but signal reflection and deterioration worsen, limiting effective transmission range
Solution Approach 1:
The patent uses parameter changes by designing the impedance matching pattern to modify the electrical characteristics of the transmission line. The pattern includes protrusions and recesses that change the effective capacitance and impedance at different positions along the transmission line. This gradual parameter variation creates a smooth impedance transition that reduces signal reflection and maintains signal integrity even at high frequencies, enabling high-speed data transmission without sacrificing reliability.
3Reliability
If an impedance matching pattern is added to the transmission line to reduce signal reflection, then signal transmission effectiveness improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by implementing the impedance matching pattern as localized protrusions and recesses rather than requiring complete redesign of the entire transmission line. These localized features can be integrated into existing PCB manufacturing processes using standard etching and patterning techniques, minimizing additional manufacturing complexity while achieving the desired impedance matching effect.
Solution Approach 2:
The patent merges the impedance matching function with the existing transmission line structure by integrating the pattern directly into the ground plane or signal trace layer. This combination eliminates the need for separate impedance matching components or additional layers, reducing manufacturing complexity while maintaining the signal transmission effectiveness benefits.
Data Source
AI summary
Disclosed herein is a semiconductor device including: a semiconductor circuit element configured to process an electrical signal having a predetermined frequency; and a transmission line configured to be connected to the semiconductor circuit element via a wire and transmit the electrical signal. An impedance matching pattern having a symmetric shape with respect to a direction of the transmission line is provided in the transmission line.