Tunable Transmission Line Phase Shifter Design
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Solution Overview
Problem
Conventional phase shifters for millimeter wave communication systems are large, complex, and inefficient, with limited capacitance tuning ranges and high insertion losses, making them unsuitable for integrated circuits and millimeter wave applications.
Innovation Solution
A tunable phase shifter design featuring crossing lines with tunable capacitance and an inductance return line that conforms to the shape of the signal line, allowing for high capacitance tuning ranges and maintaining a constant characteristic impedance, thereby reducing size and complexity while improving phase shift accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional phase shifters are used in millimeter wave systems, then phase shifting function is provided, but device size and complexity increase due to long transmission lines needed to connect spaced-out components
Solution Approach 1:
The patent merges the phase shifting functionality directly into the transmission line structure by embedding crossing lines perpendicular to the signal line. This integration eliminates the need for separate phase shifter components spaced apart from the transmission line, thereby reducing overall device complexity and eliminating long connection traces while maintaining the phase shifting function.
Solution Approach 2:
The patent introduces crossing lines that extend in a direction perpendicular to the signal line's longitudinal direction. This dimensional change allows the phase shifting mechanism to be embedded within the transmission line structure itself rather than requiring external components, effectively reducing the footprint and complexity of the device.
2Adaptability or versatility
If conventional phase shifters are used, then phase shifting is achieved, but capacitance tuning range is limited
Solution Approach 1:
The patent employs variable capacitance elements (such as varactors or switched capacitors) at strategic positions along the transmission line to dynamically adjust the phase shift. This dynamic capacitance tuning mechanism enables a significantly wider capacitance tuning range compared to conventional fixed or limited-range phase shifters, allowing adaptive phase control for beam steering and other millimeter wave applications.
3Loss of energy
If conventional phase shifters are used, then phase shifting function is provided, but insertion losses are high
Solution Approach 1:
The patent extracts the phase shifting functionality from separate discrete components and integrates it directly into the transmission line structure through embedded crossing lines. This extraction of the phase shift mechanism from external components eliminates additional connection paths and reduces the number of interfaces where energy loss occurs, thereby minimizing insertion losses while maintaining phase shifting capability.
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
The design achieves a significantly larger capacitance tuning range compared to conventional phase shifters, reduces device size, and minimizes insertion losses, enabling efficient phase shifting in millimeter wave systems without affecting the characteristic impedance.
Implementation Method 1
The capacitance of this component can be adjusted to provide phase adjustments in a phase shifter. A transistor's capacitance provides a variable capacitance that allows tuning.
Implementation Method 2
an inductance return line below the crossing lines substantially parallel to the longitudinal direction of the signal line, wherein the inductance return line provides a tunable inductance
Data Source
AI summary
Methods for creating a tunable phase shifter include setting physical dimension limits for the tunable phase shifter; determining electrical parameters for the tunable phase shifter, including a characteristic impedance limit and a maximum inductance tuning range, based on the physical dimension limits using a processor; and determining physical dimensions for an inductance tuning transistor and a capacitor tuning transistor, such that a characteristic impedance range is minimized.