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| Microwave
Dielectric Components |
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Features |
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1) High dielectric constant |
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·Large relative dielectric constant, 10-93, |
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enabled compact design of the resonator. |
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2) High Q-value |
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·The high Q-value of dielectric material is |
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comparable with those of the cavity-resonator. |
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3) Low, controllable temperature coefficient |
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·The temperature stability is high |
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and it is possible to control. |
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4) Products with special shape and size can also be
manufactured. |
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Applications |
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·Dielectric filters for mobile communications. |
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·Dielectric resonators for Base stations. |
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·Substrates for high frequency circuits and
capacitors. |
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| Basic Material Properties of
Dielectric Ceramics |
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·Size of Resonators |
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The size
of the resonator with the relative dielectric constant er is scaled down in comparison |
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with the
metallic cavity-resonator by a factor of 1/Öer |
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·Q-value |
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The
Q-value is determined approximately by the dielectric loss (tan d) and the Q-value |
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of the
resonator increases as the dielectric loss decreases. |
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·Temperature Coefficient of Resonant Frequency (Tf) |
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Temperature coefficient of resonant frequency is determined by Te |
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and
linear thermal expansion coefficient ( a ) |
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February '05 ELECTRONIC COMPONENTS DIV. |
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