unloaded Q

unloaded Q

[¦ən′lōd·əd ′kyü]
(electronics)
The Q of a system when there is no external coupling to it.
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Unloaded Q is a figure of merit for a resonator, and is the ratio of energy stored versus energy dissipated per RF cycle.
5 Unloaded Q (approximate) ~700 ~700 Return loss at -9 -6 resonance, typical (dB) Dimensions typical (") X 0.
A rigorous mode-matching method was used to compute the resonant frequency, unloaded Q and fields of the desired resonant mode, as well as the spurious higher order modes of the conductor (solid or ring)loaded resonators.
A rigorous mode-matching method is used to compute the resonant frequency, unloaded Q and resonant-mode fields.
The corresponding realized unloaded Q of the filter is greater than 6000.
A rigorous mode-matching technique was used to compute the resonant frequency, unloaded Q and resonator fields.
10 front end * Based on an unloaded Q of 6500, sixth-order quasi-elliptical design.
Figure 1 shows the simulated difference in filter insertion loss for two filters, including a conventional filter with unloaded Q values of roughly 6500 and a superconducting filter with unloaded Qs of 30,000.
The high unloaded Qs translate into highly selective frequency responses with low passband insertion loss and high rejection.
Fabricated with superconducting films on special substrates rather than with conventional metal conductors on ceramic or polytetrafluoroethylene (PTFE) substrates, these filters are capable of unloaded Qs exceeding 50,000.
For receiver applications, HTS bandpass filters offer the best electrical performance of the three filter types with unloaded Qs approaching 50,000.
However, most standard tunable filters do not realize the unloaded Qs ([Q.