Switchable Acoustic Resonator for Multi-Band RF Filter Tuning

Solution Overview

Problem

Mobile communication devices require multiple front-end filters to support various frequency bands globally, leading to increased cost, weight, and complexity due to the need for separate filters for each frequency band.

Innovation Solution

The development of switchable acoustic resonators, which include a resonator and a reactive element connected with a switch, allowing for selective modification of resonance frequencies by switching the reactive element's state, enabling a single filter to operate across multiple frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple front-end filters are used to support various frequency bands, then frequency band compatibility is improved, but device complexity increases

Engineering Contradiction:

Improvefrequency band compatibilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a universal filter structure that can operate across multiple frequency bands by dynamically adjusting resonator parameters. A single filter design supports both North American and European frequency bands through electronic tuning of resonant frequencies, eliminating the need for separate dedicated filters for each region while maintaining full frequency band compatibility

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent employs dynamic parameter adjustment of resonators through switching networks that connect different capacitive elements. The resonant frequency of each resonator can be dynamically changed by switching between different capacitor configurations, allowing the filter to adapt its frequency response in real-time to match the required frequency band without physical filter replacement

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple front-end filters are used to support various frequency bands, then frequency band compatibility is improved, but weight increases

Engineering Contradiction:

Improvefrequency band compatibilityVSAvoidweight

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The patent implements a universal filter structure that can operate across multiple frequency bands by dynamically adjusting resonator parameters. A single filter design supports both North American and European frequency bands through electronic tuning of resonant frequencies, eliminating the need for separate dedicated filters for each region while maintaining full frequency band compatibility

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines multiple filter functions into a single integrated filter assembly. By merging the functionality of what would traditionally require separate filters for different frequency bands into one unified structure with switchable resonators, the overall weight is reduced while maintaining the ability to support multiple frequency bands

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If multiple front-end filters are used to support various frequency bands, then frequency band compatibility is improved, but cost increases

Engineering Contradiction:

Improvefrequency band compatibilityVSAvoidcost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent implements a universal filter structure that can operate across multiple frequency bands by dynamically adjusting resonator parameters. A single filter design supports both North American and European frequency bands through electronic tuning of resonant frequencies, eliminating the need for separate dedicated filters for each region while maintaining full frequency band compatibility

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines multiple filter functions into a single integrated filter assembly. By merging the functionality of what would traditionally require separate filters for different frequency bands into one unified structure with switchable resonators, the overall weight is reduced while maintaining the ability to support multiple frequency bands

Inventive Principle:

Principle #5Merging (Combining)

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 solution reduces the number of filters needed, decreasing device complexity, weight, and production costs while enabling efficient operation across different frequency bands, particularly in regions with partially overlapping bands.

Implementation Method 1

switchable resonators, which include a resonator and a reactive element connected with a switch, allowing for selective modification of resonance frequencies

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS20230353125A1Switch-based variable acoustic resonator

Publication Date: 2023.11.02 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

A resonator may include a first terminal, a second terminal, a resonator between the first terminal and the second terminal, and a reactive element in series with a switch. The reactive element in series with the switch may be connected in parallel with the resonator. The resonator may provide a first set of resonance frequencies when the switch is operated in a non-conducting state and a second set of resonance frequencies when the switch is operated in a conducting state.