Sintered materials
This invention relates to the production of low dielectric loss ceramic materials, particularly ceramic materials useful in dielectric resonators. In current microwave communication, technology dielectric resonators (DRs) are key elements for filters, low phase noise oscillators and frequency standa...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
20.01.2004
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| Online Access | Get full text |
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| Summary: | This invention relates to the production of low dielectric loss ceramic materials, particularly ceramic materials useful in dielectric resonators. In current microwave communication, technology dielectric resonators (DRs) are key elements for filters, low phase noise oscillators and frequency standards. DRs possess resonator quality factors (Q) comparable to cavity resonators, strong linearity at high power levels, weak temperature coefficients, high mechanical stability and small size.
Sintered alumina of Q value of greater than 25,000 and up to and greater than 45,000 at 10 GHz and at 25° C., useful in useful in dielectric resonators can be obtained by sintering alumina powders with low level of impurities at between 1500° C. and 1600° C. until a density of at least 98% of its theoretical value is obtained. |
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