Reconfigurable Transmission Line Shielding for Impedance and Phase Shift
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Solution Overview
Problem
Existing transmission lines have fixed characteristic impedance and phase shift characteristics that cannot be readily adjusted, limiting their versatility in RF and microwave applications.
Innovation Solution
A transmission line design incorporating a central trace and lateral traces with a shield structure below, utilizing shunt and series switches to dynamically adjust characteristic impedance and phase shift through selective electrical connections of shield elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional transmission line geometry is used, then manufacturing is simple, but characteristic impedance and phase shift cannot be adjusted
Solution Approach 1:
The shield ground plane is segmented into multiple discrete shield elements that can be independently connected or disconnected from ground through switch networks. This segmentation allows selective adjustment of capacitance and inductance values, enabling dynamic control of characteristic impedance and phase shift while maintaining a relatively simple overall structure.
Solution Approach 2:
The transmission line structure incorporates switch networks (such as PIN diodes or FETs) that enable dynamic reconfiguration of the shield elements' connection states. This transforms the previously static transmission line into a dynamic structure where characteristic impedance and phase shift can be adjusted in real-time based on operational requirements.
2Adaptability or versatility
If shield elements are added to adjust impedance, then adaptability improves, but device complexity increases
Solution Approach 1:
The switch network serves multiple functions simultaneously: it controls the connection state of shield elements to ground, enables adjustment of characteristic impedance, controls phase shift, and can provide signal routing. This multi-functionality reduces the need for separate components and justifies the added complexity by delivering multiple benefits from a single structural addition.
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
Enables a wide range of adjustable impedance and phase shift configurations, allowing real-time variation and optimization of circuit behavior.
Implementation Method 1
The ground plane increases the capacitance and decreases the inductance of the transmission line, thus altering its characteristic impedance and phase shift
Implementation Method 2
The ground plane increases the capacitance and decreases the inductance of the transmission line
Data Source
Figure 1~3
Figure 4a~5
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AI summary
An electronic component includes a transmission structure and a shield structure below the transmission structure. The transmission structure includes a central trace and a pair of lateral traces. The shield structure includes multiple switchable shield elements that extend below the central trace. At least one of the shield elements is selectively electrically connectable to a lateral shield trace, causing the component to assume multiple values of characteristic impedance and phase shift. An associated device and a method of operation are further disclosed.