SAW Resonator Reflecting Grid for Stable Output Power
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Solution Overview
Problem
Existing SAW resonators experience significant power variation in their resonance frequency range, necessitating an improvement to enhance output power stability.
Innovation Solution
The SAW resonator incorporates an interdigital transducer with a conductive grid structure featuring a bus bar, dummy electrodes, and inner bars, which are strategically arranged to provide effective reflecting structures, thereby stabilizing output power within the resonance frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional interdigital transducer structure is used, then the device complexity is low, but the output power stability deteriorates due to large power variation in the resonance frequency range
Solution Approach 1:
The conductive grid is segmented into multiple functional components: bus bars for signal transmission, dummy electrodes for reflection control, inner bars for additional reflection, and practical electrodes for transduction. This segmentation allows each component to be optimized for its specific function, improving overall output power stability while maintaining manageable complexity through modular design
Solution Approach 2:
Different regions of the conductive grid are assigned different properties: the bus bars provide continuous conduction paths, the dummy electrodes provide controlled reflections at specific locations, and the inner bars provide additional reflection control between the bus bars and practical electrodes. This local differentiation of properties enables precise control of power distribution across the resonance frequency range
2Reliability
If the conductive grid with dummy electrodes and inner bars is implemented, then the output power stability improves, but the device complexity increases
Solution Approach 1:
The conductive grid structure serves multiple functions simultaneously: the bus bars transmit signals, the dummy electrodes control reflections, the inner bars provide additional reflection control, and the practical electrodes perform transduction. This multi-functionality consolidates what would otherwise require separate components into a single integrated structure, improving output power stability without proportionally increasing device complexity
Solution Approach 2:
The patent merges the functions of signal transmission, reflection control, and transduction into a single conductive grid structure. The bus bars, dummy electrodes, inner bars, and practical electrodes are electrically connected to form an integrated system that achieves improved output power stability through coordinated operation of all components
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 proposed design achieves improved output power stability and optimized band-pass filtering properties, characterized by reduced insertion loss and pass-band ripple, resulting in high quality factor values and low insertion loss.
Implementation Method 1
The SAW resonator is disposed on a piezoelectric substrate
Implementation Method 2
The first conductive grid includes a first bus bar, a first plurality of dummy electrodes, a first conductive bar and a first plurality of inner bars
Data Source
AI summary
An interdigital transducer for a surface-acoustic-wave resonator includes a conductive grid and a plurality of practical electrodes. The conductive grid includes a bus bar, a plurality of dummy electrodes and a conductive bar. The bus bar has a signal transmission terminal, and is disposed on a first side of the first conductive grid. The plurality of dummy electrodes directly extend from the bus bar. The conductive bar is disposed on a second side of the first conductive grid, and is opposite to the bus bar. Each of the plurality of practical electrodes extends from the conductive bar.