Shared-Structure Resonator Filter for Multiband Miniaturization
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Solution Overview
Problem
Existing electromechanical resonators and filters face challenges in miniaturization and achieving high Q values, limiting their integration and performance in multiband radio systems, where a single resonator's miniaturization leads to increased occupation area and degradation of frequency-dependent electric characteristics.
Innovation Solution
A resonator configuration where the oscillator and support section play dual roles, with one oscillator supporting the other, and an insulating layer facilitating a pull-in state, allowing for torsional oscillation and reduced energy dissipation, enabling miniaturization and high integration while maintaining high Q values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of electromechanical resonators are arranged and mechanically joined to form a filter, then the filter functionality is achieved, but the occupation area enlarges and miniaturization is limited
Solution Approach 1:
The support section for supporting the first oscillator is designed to function simultaneously as the second oscillator. This merging of functions allows the filter to be formed with fewer discrete components, reducing the overall occupation area while maintaining the necessary filter functionality through the coupled oscillation modes of the integrated structure.
Solution Approach 2:
The support section serves dual purposes: it provides mechanical support for the first oscillator while also acting as the second oscillator with its own excitation and detection electrodes. This multi-functionality eliminates the need for separate support structures and oscillators, enabling miniaturization of the filter assembly.
2Device complexity
If each structural component plays only one role, then the structure is simple, but miniaturization is limited and the whole occupation area enlarges
Solution Approach 1:
The support section is designed to perform multiple functions: mechanically supporting the first oscillator while simultaneously serving as the second oscillator with independent excitation and detection capabilities. This multi-functional design reduces the number of separate components needed, enabling miniaturization without significantly increasing structural complexity.
3Volume of moving object
If the oscillator and support section are integrated to play dual roles, then miniaturization is achieved, but the Q value may degrade due to increased coupling
Solution Approach 1:
The support section is designed with differentiated local properties: it provides rigid mechanical support in regions requiring stability while maintaining oscillatory freedom in regions where it functions as the second oscillator. This local quality differentiation allows the integrated structure to maintain high Q values by minimizing unwanted energy dissipation paths while enabling miniaturization.
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
This configuration allows for the realization of small-size, highly integrated filters with improved Q values, suitable for dual mode and multiband systems by utilizing the dual roles of oscillators and support sections, effectively reducing oscillation energy dissipation and enhancing frequency selection capabilities.
Implementation Method 1
when an RF signal is input to an excitation electrode 122, an electrostatic force occurs between gaps G of the oscillator 110 and the excitation electrode 122
Implementation Method 2
the oscillator 110 and the oscillator 112 connected to the oscillator 110 via the joint section 134 largely oscillate only if the self resonant frequency of the oscillator and the frequency of the input RF signal
Implementation Method 3
If the oscillator 112 oscillates, the capacity between the oscillator 112 and a detection electrode 124 changes and thus if a potential (DC voltage) is applied, an electric current is output from the detection electrode 124
Data Source
AI summary
A resonator and a filter that can be miniaturized and highly integrated are provided. In the invention, a resonator wherein parts of resonators, support sections, and joint sections are mutually shared is formed. The mutual configuration is selectively switched as required and a large number of frequencies can be selected in the same filter unit. The resonators, the support sections, and the joint sections different in size and shape are used in combination, whereby a filter unit having a large number of selective frequencies is provided.