Rapidly tunable RF cavity
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United States of America Patent
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Aug 13, 2013
Grant Date -
N/A
app pub date -
Nov 12, 2009
filing date -
Nov 13, 2008
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Abstract
A rapidly tunable RF cavity includes a cavity body, and at least one ferroelectric element disposed within a hollow interior region of the cavity body. A biasing system provides a nominal DC electric field bias across the ferroelectric element so as to induce a rapid change in dielectric permittivity of the ferroelectric element, and a corresponding change in resonant frequency of the RF cavity. A change in dielectric permittivity of up to about 20% can be induced within a response time of less than 10 nanoseconds, with a biasing field strength of less than 50 kV. In some embodiments, the ferroelectric element is made of BST (barium-strontium titanate). The ferroelectric element may be cylindrically shaped, and coaxial with the cavity body. The biasing system may include one or more copper cylinders supported by supporting rods.
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