High-Q Ceramic Composition for 10 GHz Filter Materials

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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, a hexagonal perovskite crystal structure, or a double perovskite crystal structure into barium magnesium tantalate, eliminating the need for tin and achieving Q values greater than 12000 at 10 GHz, with compositions such as 95 wt. % Ba3MgTa2O9 + 5 wt. % Ba4Ta2WO12 + 0.2 weight % MgTa2O6 or 95 wt. % Ba3MgTa2O9 + 5 wt. % Ba4Ta2WO12 + 0.5 weight % MgTa2O6.

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 processing difficulty increases due to tin's 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, thus improving ease of manufacture while maintaining the desired Q value through the modified chemical composition

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining barium magnesium tantalate with tungsten oxide compounds. This composite approach allows the base material to provide the necessary dielectric properties while the tungsten oxide dopant provides structural stability and reduces processing difficulties associated with pure tin doping

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If barium zinc tantalate is used as a ceramic material solution, then the material is easier to process, but the Q value is insufficient for frequencies above 10 GHz

Engineering Contradiction:

ImproveprocessabilityVSAvoidQ value at high frequency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by substituting zinc with magnesium and tantalum in specific ratios, and by adding tungsten oxide compounds as dopants. This compositional modification transforms the material properties to achieve both high Q values at frequencies above 10 GHz and adequate processability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality by incorporating tungsten oxide compounds at specific concentrations (0.1-10 wt%, preferably 0.5-5 wt%) into the barium magnesium tantalate matrix. This localized doping approach optimizes the Q value at high frequencies while maintaining overall material processability, rather than requiring uniform composition changes throughout the entire material system

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11919779B2Methods of making high q modified materials for high frequency applications

Publication Date: 2024.03.05 SKYWORKS SOLUTIONS INC

AI summary

Disclosed are embodiments of making a high Q ceramic material. The method includes providing Ba3CoTa2O9 and incorporating one of Ba2MgWO6, Ba8LiTa5WO24, Ba8LiTa5WO24, Ba2MgWO6, Ba3LaTa3O12, Ba8LiTa5WO24, BaLaLiWO6, Ba4Ta2WO12, Ba2La2MgW2O12, BaLaLiWO6, Sr3LaTa3O12, and SrLaTaO12 into the Ba3CoTa2O9 to form a solid solution having a high Q value of greater than 12000 at about 10 GHz.