Programmable SAW Resonator Matching Network for Multi-Frequency Sensing
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Solution Overview
Problem
Existing surface acoustic wave sensors occupy a large volume and have high manufacturing costs due to the need for multiple reflection gratings to monitor multiple central frequencies, leading to increased size and reduced sensitivity and reliability due to energy loss during signal transmission.
Innovation Solution
A wireless surface acoustic wave resonator system with a matching network comprising a field programmable switch circuit connected in parallel to an optimal matching network, allowing for multiple central frequencies to be achieved without increasing the substrate area, using a field programmable control logic device to control the connection of branch circuits in the matching network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple reflection gratings are assembled to monitor multiple central frequencies, then multiple central frequencies can be monitored, but the substrate area increases and manufacturing costs increase
Solution Approach 1:
The patent implements a field programmable control switch circuit that can be configured through software to monitor multiple central frequencies. The switch circuit includes multiple branch circuits with different capacitance values, and by programmatically controlling which branch is connected, a single SAW resonator can monitor multiple frequencies without requiring multiple separate resonators or expanding substrate area.
Solution Approach 2:
The patent introduces a dynamic switching mechanism that allows the matching network to reconfigure its capacitance value based on which frequency needs to be monitored. The field programmable control switch circuit can dynamically connect different branch circuits to the SAW resonator, enabling the system to adaptively monitor multiple frequencies over time rather than requiring all frequencies to be monitored simultaneously with multiple fixed resonators.
2Adaptability or versatility
If multiple reflection gratings are assembled to monitor multiple central frequencies, then multiple central frequencies can be monitored, but manufacturing costs increase
Solution Approach 1:
The field programmable control switch circuit serves multiple frequency monitoring functions through a single hardware implementation. By using software configuration to control which branch circuit is active, the system eliminates the need to manufacture multiple separate SAW resonators, thereby reducing manufacturing costs while maintaining the capability to monitor multiple central frequencies.
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) of the matching network through software-controlled switching rather than through physical manufacturing variations. Each branch circuit contains different capacitance values, and by programmatically selecting which branch to connect, the system can monitor different frequencies without requiring physical manufacturing of multiple resonators with different parameters.
3Adaptability or versatility
If several reflection gratings are assembled, then multiple central frequencies can be monitored, but energy loss increases and sensitivity decreases
Solution Approach 1:
The field programmable control switch circuit enables a single SAW resonator to perform multiple frequency monitoring functions sequentially. Since only one resonator is used at a time, the acoustic energy loss that occurs when sound waves travel between multiple reflection gratings is eliminated. The switch circuit electrically reconfigures the capacitance value rather than physically moving acoustic energy between multiple gratings.
Solution Approach 2:
The patent replaces the mechanical/acoustic system of multiple reflection gratings with an electrical switching system. Instead of using multiple acoustic reflection gratings that require sound waves to physically travel between them (causing energy loss), the system uses an electronic switch circuit to reconfigure the electrical matching network parameters, thereby eliminating the energy loss associated with acoustic wave propagation between multiple gratings.
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 system enables flexible and efficient monitoring of multiple central frequencies with a compact design, reducing manufacturing costs and maintaining sensitivity and reliability by minimizing energy loss and substrate area requirements.
Implementation Method 1
an interdigital transducer (IDT) and a reflection grating... The surface acoustic waves excited by the IDT on the surface of substrate
Implementation Method 2
The surface acoustic waves excited by the IDT on the surface of substrate reflect between reflection gratings back and forth and superimpose over each other... stationary waves are formed within the resonant cavity and resonance happens
Data Source
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AI summary
The present invention discloses a distributed surface acoustic wave resonator and a surface acoustic wave sensing system, the distributed surface acoustic wave resonator comprising a first antenna, a matching network, a reflection grating, and an interdigital transducer, with at least said reflection grating and said interdigital transducer assembled on a piezoelectric substrate, said matching network comprising an optimal matching network which is composed of at least one capacitor and at least one inductor, said optimal matching network also connecting a switch circuit in parallel, said switch circuit comprising multiple branch circuits connected in parallel, each branch circuit comprising at least one capacitor and/or one inductor, said each branch circuit of the switch circuit also comprising a switch to control the conduction status of that branch circuit. In the distributed surface acoustic wave resonator of the present invention, when the matching network connects different branch circuit, the corresponding resonator corresponds to one central frequency, i.e. the central frequency of the resonator can be changed. The circuit structure is simple and occupies small space.