Dielectric resonator: Difference between revisions
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Dielectric resonators are often used to provide a frequency reference in an oscillator circuit. |
Dielectric resonators are often used to provide a frequency reference in an oscillator circuit. |
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A dielectric resonator is generally enclosed in an [[electromagnetic shielding| RF shield]] to prevent it radiating. An unshielded dielectric resonator can be used as an antenna. This type of antenna is usually called a DRA (Dielectric |
A dielectric resonator is generally enclosed in an [[electromagnetic shielding| RF shield]] to prevent it radiating. An unshielded dielectric resonator can be used as an antenna. This type of antenna is usually called a [[Dielectric Resonator Antenna|DRA]] (Dielectric Resonator Antenna). |
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[[Category:Radio electronics]] |
[[Category:Radio electronics]] |
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Revision as of 00:36, 19 September 2007
A dielectric resonator is an electronic component that exhibits resonance for a narrow range of frequencies, generally in the microwave band. The resonance is similar to that of a circular hollow metallic waveguide, except that the boundary is defined by large change in permittivity rather than by a conductor. Dielectric resonators generally consist of a "puck" of ceramic that has a large dielectric constant and a low dissipation factor. The resonant frequency is determined by the overall physical dimensions of the puck and the dielectric constant of the material.
Dielectric resonators are often used to provide a frequency reference in an oscillator circuit.
A dielectric resonator is generally enclosed in an RF shield to prevent it radiating. An unshielded dielectric resonator can be used as an antenna. This type of antenna is usually called a DRA (Dielectric Resonator Antenna).