SAW-Multiferroic RF Phase Shifter for Wideband Nonreciprocity
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Solution Overview
Problem
Current nonreciprocal RF phase shift devices are bulky, expensive, and lack the ability to operate efficiently across a wide frequency range from 1000 MHz to 50 GHz, with existing miniature devices having limited tunability and high insertion loss.
Innovation Solution
A microfabricated nonreciprocal microwave phase shift device utilizing a substrate with transducers, a piezoelectric material for generating acoustic waves, and a thin film magnetic material for magnetoelastic coupling, enabling significant phase shift nonreciprocity with low insertion loss and tunability across the desired frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional nonreciprocal RF phase shift devices are used, then nonreciprocal phase shift function is achieved, but the device size is bulky and weight is heavy
Solution Approach 1:
The patent replaces conventional mechanical/electromagnetic nonreciprocal phase shift devices with an acoustic wave-based system using surface acoustic waves (SAWs) and magnetoelastic interactions. This substitution enables nonreciprocal phase shifting through acoustic wave propagation in magnetostrictive materials, achieving the same functional effect with dramatically reduced size and weight by several orders of magnitude
Solution Approach 2:
The patent utilizes changes in material parameters, specifically employing magnetostrictive materials whose acoustic wave propagation characteristics change under applied magnetic fields. By controlling the magnetic field strength and direction, the device achieves tunable nonreciprocal phase shift while maintaining compact dimensions, as the material's elastic and magnetic properties are dynamically adjusted rather than requiring large structural changes
2Ease of operation
If conventional nonreciprocal RF phase shift devices are used, then nonreciprocal phase shift function is achieved, but the device cost is high
Solution Approach 1:
The patent employs thin film magnetostrictive materials deposited on substrates to create the nonreciprocal phase shift functionality. This thin-film approach dramatically reduces material consumption and device complexity compared to conventional bulk devices, enabling cost-effective manufacturing through standard thin-film deposition techniques while maintaining the required nonreciprocal phase shift performance
Solution Approach 2:
The patent uses composite structures combining piezoelectric materials for SAW generation/detection with magnetostrictive materials for nonreciprocal phase shifting. This composite approach leverages the strengths of each material type, enabling functionality with reduced overall device complexity and manufacturing cost compared to single-material conventional devices
3Weight of stationary object
If miniature nonreciprocal RF phase shift devices are used, then device size is reduced, but frequency tunability is limited and insertion loss increases
Solution Approach 1:
The patent implements dynamic frequency tunability by applying adjustable external magnetic fields to the magnetostrictive thin film. The resonant frequency of the magnetoelastic interaction can be continuously tuned by varying the magnetic field strength, allowing the compact device to operate across a wide frequency range (100 MHz to 10 GHz) without sacrificing size reduction, as the tuning is achieved through field control rather than physical reconfiguration
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 device achieves high-frequency tunability with low power consumption, compact size, and low insertion loss, offering more than 48 dB isolation and a narrow bandwidth, making it suitable for mobile devices and reducing size and weight by several orders of magnitude compared to existing technologies.
Implementation Method 1
a first piezoelectric material configured to generate and transport acoustic waves from a signal applied to a first transducer
Implementation Method 2
a thin film magnetic material configured to couple to acoustic waves through magnetoelastic coupling so as to have non-reciprocal magnetoelastic coupled acoustic wave transport
Data Source
AI summary
A nonreciprocal microwave phase shifter or circulator includes a substrate, a transducer on a surface of the substrate and configured to reciprocally convert between electrical signals to acoustic waves, a first piezoelectric material configured to generate and transport acoustic waves from a signal applied to the transducer, and a thin film magnetic material configured to couple to acoustic waves through magnetoelastic coupling so as to have nonreciprocal magnetoelastic coupled acoustic wave transport. Phase shifts of acoustic waves through the thin film magnetic material in directions toward and away the transducer have significantly different magnitudes.