Switchable Acoustic Wave Filter for Close-Frequency Bandwidth Tuning
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Solution Overview
Problem
Existing acoustic wave filters face challenges in efficiently filtering signals with close frequencies and maintaining high performance under different conditions, often requiring multiple filters that increase physical size and cost.
Innovation Solution
A switchable acoustic wave filter design that includes multiple resonators and a switch to selectively connect or isolate them, allowing for adjustable bandwidth and filter type, reducing the need for multiple filters and minimizing switch losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple acoustic wave filters are used to filter signals with close frequencies, then filtering performance is improved, but device complexity and physical size increase
Solution Approach 1:
The patent combines multiple acoustic wave resonators with different resonant frequencies into a single filter structure. The filter includes a first resonator, second resonator, and third resonator that work together to provide multiple filtering functions, eliminating the need for separate filters for different frequency bands.
Solution Approach 2:
The single filter is designed to perform multiple filtering functions simultaneously. By configuring resonators with different resonant frequencies and using switching circuitry, the filter can handle signals with close frequencies across different bands, making one filter universal for multiple purposes.
2Reliability
If multiple acoustic wave filters are used to filter signals with close frequencies, then filtering performance is improved, but physical layout area increases
Solution Approach 1:
The patent merges multiple filter functions into a single integrated structure. The first, second, and third resonators are combined within one filter housing, sharing common electrical connections and physical space, thereby reducing the overall footprint compared to separate filters.
Solution Approach 2:
The filter structure nests multiple resonators within a single filter unit. The resonators are arranged in a compact configuration where they share common electrical nodes and physical boundaries, effectively nesting multiple functional elements within one compact package.
3Adaptability or versatility
If filters are designed for different conditions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The filter incorporates switching circuitry that allows dynamic reconfiguration of the resonator connections. The switch can connect or disconnect resonators based on the desired filtering condition, enabling the filter to adapt its characteristics without requiring multiple fixed filters.
Solution Approach 2:
The filter design allows changing operational parameters by switching between different resonator configurations. By altering which resonators are connected to common nodes, the filter's frequency response and bandwidth can be adjusted to match different signaling conditions.
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 design achieves reduced filter switching loss, smaller physical layout, and lower cost by allowing flexible bandwidth adjustment and improved performance for co-existence scenarios.
Implementation Method 1
An acoustic wave filter can include a plurality of acoustic wave resonators arranged to filter a radio frequency signal
Implementation Method 2
Example acoustic wave filters include surface acoustic wave (SAW) filters
Implementation Method 3
BAW filters include BAW resonators. Example BAW resonators include film bulk acoustic wave resonators (FBARs)
Implementation Method 4
a switch configured to electrically connect the first acoustic wave resonator to a node of the switchable acoustic wave filter in a first state and to electrically isolate the first acoustic wave resonator from the node
Data Source
AI summary
Aspects of this disclosure relate to a switchable acoustic wave filter. The switchable acoustic wave filter can include a switch configured to electrically connect an acoustic wave resonator to a node in a first state and to electrically isolate the acoustic wave resonator from the node in a second state. The switchable acoustic wave filter can filter a radio frequency signal with at least the acoustic wave resonator and a second acoustic wave resonator in the first state. The switchable acoustic wave filter can filter the radio frequency signal with at least the second acoustic wave resonator in the first state. Related multiplexers, radio frequency systems, wireless communication devices, and methods are also disclosed.