Filter Module With Switchable Film Bulk Acoustic Resonators

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Solution Overview

Problem

The increasing demand for small, lightweight filters in mobile communications devices to support multiple frequency bands complicates signal processing and increases manufacturing costs and module size due to the need for multiple filters, leading to potential interference between adjacent frequency bands.

Innovation Solution

A filter module incorporating series and shunt units with film bulk acoustic resonators, where the first and second series resonators have different resonant frequencies, and switches allow for selective operation to adjust frequency bands, reducing interference by varying the upper and lower limit frequencies of filters, and integrating a notch filter on a single chip with the filter module to manage overlapping bandwidths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple filters are used to support multiple frequency bands, then the frequency band coverage is improved, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvefrequency band coverageVSAvoidsignal processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic frequency band selection by using switch elements to selectively connect different series resonators based on the required frequency band. This allows a single filter module to dynamically adapt its frequency response by activating only the necessary resonators, thereby supporting multiple frequency bands while maintaining simple signal processing and reducing overall device complexity.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple filters are used to support multiple frequency bands, then the frequency band coverage is improved, but the manufacturing cost increases

Engineering Contradiction:

Improvefrequency band coverageVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent combines multiple resonators with different resonant frequencies into a single integrated filter module. By merging multiple resonating elements and control switches into one compact structure that can be manufactured as a single unit, the design reduces manufacturing costs compared to producing and assembling multiple separate filter components, while still achieving multi-band frequency coverage.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If multiple filters are used to support multiple frequency bands, then the frequency band coverage is improved, but the module size increases

Engineering Contradiction:

Improvefrequency band coverageVSAvoidfilter module size

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent integrates multiple resonators and switch elements into a single compact filter module structure. By combining multiple functional elements that would traditionally require separate physical filters into one unified component, the design achieves multi-band frequency coverage without proportionally increasing the module size, thereby improving space efficiency in wireless terminals.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If multiple filters are used to support multiple frequency bands, then the frequency band coverage is improved, but interference between adjacent frequency bands occurs

Engineering Contradiction:

Improvefrequency band coverageVSAvoidfrequency band interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent employs dynamic switching control to activate only the specific series resonators needed for the current frequency band operation. This selective activation prevents adjacent frequency band resonators from being simultaneously active, thereby eliminating interference between adjacent frequency bands while maintaining comprehensive frequency band coverage capability.

Inventive Principle:

Principle #15Dynamics

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 allows for a compact filter module that effectively manages multiple frequency bands with reduced interference and manufacturing costs by selectively adjusting frequency bands and integrating components on a single chip, enhancing the efficiency and miniaturization of wireless terminal components.

Implementation Method 1

each of the plurality of series resonators includes a film bulk acoustic resonator

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a plurality of series resonators which are selectively operated, and each of the plurality of series resonators includes a film bulk acoustic resonator

Methodology Applied

Scientific EffectAcoustic resonance: Resonance

Data Source

PatentUS10547287B2Filter and front end module including the same

Publication Date: 2020.01.28 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A filter may include one or more series unit, and a shunt unit disposed between the one or more series unit and ground. The one or more series unit includes a plurality of series resonators which are selectively operated, and each of the plurality of series resonators includes a film bulk acoustic resonator.