Barium-Based High-Q Ceramic Composition for 10 GHz Processing

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Solution Overview

Problem

There is a scarcity of ceramic materials with sufficient Q values for frequencies above 10 GHz, particularly for 5G applications, as existing solutions like barium zinc tantalate do not meet high-frequency requirements, and tin-doped barium magnesium tantalate is difficult to process due to its volatility and high processing temperatures.

Innovation Solution

A high Q ceramic material is developed by incorporating a complex tungsten oxide compound, hexagonal perovskite crystal structure, or double perovskite crystal structure into barium magnesium tantalate, achieving a Q value of greater than 12000 at 10 GHz without the need for tin, thereby stabilizing the material for high-frequency applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If tin is used to dope barium magnesium tantalate to achieve acceptable Q values, then the Q value is improved, but the material becomes difficult to process due to high volatility and high temperatures required for densification

Engineering Contradiction:

ImproveQ valueVSAvoidprocessing difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the dopant material from tin to tungsten, fundamentally altering the chemical composition parameters. Tungsten has lower volatility and allows densification at more manageable temperatures, resolving the processing difficulty while maintaining high Q values through the different doping mechanism of tungsten in the barium magnesium tantalate structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the problematic tin dopant with tungsten-based dopants that are more stable and easier to handle during processing. This substitution eliminates the need for specialized high-temperature processing equipment and techniques required for tin, making the manufacturing process more accessible and consistent

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of manufacture

If barium zinc tantalate is used as a ceramic material solution, then the material is easier to process, but it does not have sufficient high frequency Q values for frequencies up to 10 GHz

Engineering Contradiction:

ImproveprocessabilityVSAvoidhigh frequency Q value

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent creates a composite material system by doping barium magnesium tantalate with tungsten-based compounds. This composite approach combines the structural framework of barium magnesium tantalate (which provides high frequency stability) with tungsten dopants (which improve processability), achieving both high Q values above 10 GHz and reasonable manufacturing ease

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies localized doping with tungsten at specific concentrations (e.g., 0.1-5 wt%) within the barium magnesium tantalate matrix. This local modification of composition allows the material to maintain the bulk properties needed for high frequency operation while the dopant sites provide the necessary processing improvements without compromising overall performance

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11926533B2Methods of making high q modified barium-based materials for high frequency applications

Publication Date: 2024.03.12 SKYWORKS SOLUTIONS INC

AI summary

Disclosed are embodiments of making a high Q ceramic material. The method includes providing Ba3NiTa2O9 and incorporating one of Ba2MgWO6, Ba8LiTa5WO24, Ba8LiTa5WO24, Ba2MgWO6, Ba3LaTa3O12, Ba8LiTa5WO24, BaLaLiWO6, Ba4Ta2WO12, Ba2La2MgW2O12, BaLaLiWO6, Sr3LaTa3O12, and SrLaTaO12 into the Ba3NiTa2O9 to form a solid solution having a high Q value of greater than 12000 at about 10 GHz.