SAW Filter Floating Conductor Layout for Spurious Frequency Reduction
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Solution Overview
Problem
Designing a surface-acoustic-wave (SAW) filter that provides effective filtering for high-frequency applications above 2 GHz while minimizing spurious frequencies and reducing the need for additional space in space-constrained devices is challenging.
Innovation Solution
Incorporating an electrical conductor within a barrier region of the SAW filter with a floating potential, surrounded by a gap to reduce the electric field and local capacitance, thereby minimizing spurious frequencies such as second-order harmonic frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional SAW filter designs are used for high-frequency applications above 2 GHz, then filtering capability is provided, but spurious frequencies are generated with larger amplitudes
Solution Approach 1:
An electrical conductor with floating potential is introduced as an intermediary element within the barrier region of the SAW filter. This conductor does not directly connect to the electrode structures but influences the electric field distribution, thereby reducing spurious frequency amplitudes without compromising the main filtering function
Solution Approach 2:
The patent modifies the electric field distribution parameters within the barrier region by introducing the floating potential conductor. This changes the local capacitance and field strength, which in turn reduces the generation of spurious frequencies while maintaining the desired filtering characteristics
2Object-affected harmful factors
If additional components are added to reduce spurious frequencies, then spurious frequency amplitude is reduced, but device size increases
Solution Approach 1:
The electrical conductor with floating potential is integrated within the existing barrier region of the SAW filter structure. By merging this spurious frequency reduction element into the existing layout without requiring additional space, the patent achieves suppression of spurious frequencies while maintaining space constraints
Solution Approach 2:
The floating potential conductor is nested within the barrier region, utilizing the existing structural space. This nested configuration allows the conductor to influence the electric field and reduce spurious frequencies without increasing the overall device footprint
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 electrical conductor with a floating potential reduces spurious frequency amplitudes, enabling efficient filtering of high-frequency signals without increasing device size.
Implementation Method 1
This enables the electrical conductor to reduce a magnitude of an electric field and/or a local capacitance of the surface-acoustic-wave filter in a transversal direction
Implementation Method 2
a surface-acoustic-wave filter with a piezoelectric layer and an electrode structure disposed on a surface of the piezoelectric layer
Data Source
AI summary
An apparatus is disclosed for a surface-acoustic-wave filter with an electrical conductor having a floating potential. In an example aspect, the apparatus includes a surface-acoustic-wave filter with a piezoelectric layer and an electrode structure disposed on a surface of the piezoelectric layer. The electrode structure includes a first comb-shaped structure and a second comb-shaped structure. The electrode structure also includes at least one electrical conductor positioned between the first comb-shaped structure and the second comb-shaped structure such that a gap separates the at least one electrical conductor from the first comb-shaped structure and the second comb-shaped structure.