Non-volatile PCM RF Switch Phase Shifter for 5G
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Solution Overview
Problem
Conventional RF switches in phase shifters are volatile, unreliable, and introduce significant insertion losses, particularly at 5G frequencies, limiting their ability to provide dynamic phase shifts and are not reciprocal, which complicates RF communication.
Innovation Solution
The use of non-volatile phase-change material (PCM) RF switches that maintain their state without power and have low insertion loss, enabling adjustable phase shifting with adaptive beamforming and reciprocal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional RF switches are used in phase shifters, then the phase shifter can be manufactured with standard components, but the insertion loss becomes significant especially at 5G frequencies
Solution Approach 1:
The patent changes the material parameter from conventional semiconductor switch materials to phase-change material (PCM), fundamentally altering the electrical characteristics to achieve low insertion loss at 5G frequencies while maintaining manufacturability through established PCM fabrication processes
Solution Approach 2:
The patent employs a composite structure combining phase-change material with metal electrodes and dielectric layers, creating a hybrid RF switch that leverages the unique properties of each material to achieve both low insertion loss and practical manufacturability
2Device complexity
If conventional volatile switches are used, then the circuit design is simpler, but the switch state is not maintained during power off requiring continuous power application
Solution Approach 1:
The patent utilizes phase transitions of the phase-change material between crystalline and amorphous states to store switch state information non-volatily, allowing the switch to maintain its state without continuous power while still enabling dynamic reconfiguration through controlled phase transitions
Solution Approach 2:
The PCM RF switch inherently maintains its state through the stable phase state of the material without requiring external power or control circuits, making the device self-sufficient and eliminating the need for additional power management complexity
3Ease of operation
If conventional switches are used, then the phase shifter can provide basic switching functionality, but the reliability varies over time and the switches are unreliable
Solution Approach 1:
The patent changes the fundamental material parameter from conventional semiconductor materials to phase-change material, which offers superior reliability through its stable phase states and resistance to degradation over time, while maintaining full switching functionality
Solution Approach 2:
The patent designs the PCM RF switch with inherent durability and stability built into the material properties, providing long-term reliability and consistent performance without requiring additional protective measures or maintenance
4Power
If amplifiers are integrated in phase shifters to compensate for insertion losses, then the signal gain is improved, but the power consumption increases significantly and design complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for amplifiers by addressing the root cause of signal loss through the use of low-loss PCM switch material, thereby reducing power consumption and design complexity while maintaining signal integrity
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 PCM RF switches provide reliable, low-loss, and adaptive phase shifting capabilities, suitable for 5G frequencies, reducing power consumption and design complexity, while maintaining phase shifts without continuous power application, suitable for both transmit and receive operations.
Implementation Method 1
non-volatile phase-change material (PCM) RF switches that maintain their state without power
Implementation Method 2
PCM RF switches with heating elements
Data Source
AI summary
A non-volatile adjustable phase shifter is coupled to a transceiver in a wireless communication device. The non-volatile adjustable phase shifter includes a non-volatile radio frequency (RF) switch. In one implementation, the non-volatile RF switch is a phase-change material (PCM) RF switch. In one approach, the non-volatile adjustable phase shifter includes a selectable transmission delay arm and a selectable transmission reference arm. A phase shift caused by the non-volatile adjustable phase shifter is adjusted when the non-volatile RF switch engages with or disengages from the selectable transmission delay arm. In another approach, the non-volatile adjustable phase shifter includes a selectable impedance element. A phase shift caused by the non-volatile adjustable phase shifter is adjusted when the non-volatile RF switch engages with or disengages from the selectable impedance element. In either approach, the phase shift changes a phase of RF signals being transmitted from or received by the transceiver.