Stacked Ceramic Resonator RF Filter Footprint Reduction

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Solution Overview

Problem

Conventional ceramic resonator filters have a wide footprint due to resonators being arranged adjacent each other in a single plane, which limits their compactness in wireless communication systems.

Innovation Solution

The implementation of stacked coaxial resonators on a printed circuit board, where the first resonators are disposed on the board and the second resonators are positioned over the first ones in a stacked configuration, allowing for a smaller footprint by reducing the width while maintaining electrical connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If resonators are arranged adjacent each other in a single plane, then the filter structure is simple and easy to manufacture, but the footprint width becomes too wide

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidfootprint width

Core Design Contradiction:

Ease of manufactureVSArea of stationary object

Solution Approach 1:

The patent transitions from a two-dimensional planar arrangement of resonators to a three-dimensional stacked configuration. Multiple rows of resonators are arranged vertically on the PCB, utilizing the height dimension to reduce the horizontal footprint width while maintaining the same number of resonators and filtering functionality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Area of stationary object

If resonators are arranged in a stacked configuration, then the footprint width is reduced to less than half, but the manufacturing complexity increases

Engineering Contradiction:

Improvefootprint widthVSAvoidstructural complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The filter structure is segmented into multiple independent rows of resonators, where each row can be positioned and connected separately. This segmentation allows for modular assembly, reducing the overall manufacturing complexity despite the three-dimensional stacked arrangement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The resonators in each row serve multiple functions: they provide filtering capability while also contributing to the compact vertical stacking arrangement. The same resonator structure is reused across multiple rows, reducing the need for additional components and simplifying the overall manufacturing process.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 results in a ceramic resonator filter with a width less than half that of conventional designs, achieving a more compact form factor without compromising performance, as demonstrated by comparable response plots showing effective frequency filtering.

Implementation Method 1

ceramic resonator radio frequency filter

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS11626653B2Method of making a ceramic resonator RF filter, an RF module and a wireless mobile device by forming stacked rows of ceramic resonators connected to a printed circuit board

Publication Date: 2023.04.11 SKYWORKS SOLUTIONS INC

AI summary

A method of manufacturing a ceramic resonator radio frequency filter includes placing one or more first coaxial resonators on a printed circuit board, and placing one or more second coaxial resonators over the one or more first coaxial resonators so that the coaxial resonators are arranged in a stacked configuration on the printed circuit board. The method also includes electrically connecting the one or more first coaxial resonators and second coaxial resonators to the printed circuit board.