Modified Barium Magnesium Tantalate for High-Q 10 GHz Ceramics

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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.

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 processing temperatures required

Engineering Contradiction:

ImproveQ valueVSAvoidprocessing difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the doping element from tin to tungsten, fundamentally altering the chemical composition parameters. Tungsten has lower volatility and allows processing at more manageable temperatures, thus improving ease of manufacture while maintaining the Q value through the modified chemical composition of the ceramic material

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite ceramic material system combining barium magnesium tantalate with tungsten oxide doping. This composite approach achieves the desired Q value through the synergistic effect of the base material and tungsten dopant, while avoiding the processing issues associated with pure tin-doped systems

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

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by substituting zinc with magnesium and tantalate with a tungsten-containing phase. This compositional modification transforms the material properties to achieve ultra-high Q values above 10 GHz while maintaining reasonable processability through optimized sintering conditions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11873231B2Methods of making high Q modified barium magnesium tantalate

Publication Date: 2024.01.16 SKYWORKS SOLUTIONS INC

AI summary

Disclosed are embodiments of making a barium magnesium tantalate. The method can include providing barium magnesium tantalate and incorporating one of Ba2MgWO6, Ba8LiTa5WO24, Ba8LiTa5WO24, Ba2MgWO6, Ba3LaTa3O12, Ba8LiTa5WO24, BaLaLiWO6, Ba4Ta2WO12, Ba2La2MgW2O12, BaLaLiWO6, Sr3LaTa3O12, and SrLaTaO12 into the barium magnesium tantalate to form a solid solution having a high Q value.