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Ferroelectric tuning of a dielectric resonator filter

A method for fast, electrical tuning of a dielectric resonator is proposed. The results verify its underlying principle. By using a ferroelectric element, fast resonant frequency tuning of a DR while maintaining a useful Q-factor is possible. This is because the coupling between the high Q DR and the low Q ferroelectric element (film) and can be sensitively balanced by altering the distance between the ferroelectric and the DR. This is achieved simply by adjusting the spacer height. Further improvements in the device are possible by using higher quality BSTO films prepared by alternative techniques.

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Imperial College London
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United Kingdom
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