high-Q resonator

high-Q resonator

[′hī ‚kyü ′rez·ən‚ād·ər]
(electromagnetism)
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Figure 2 shows a schematic diagram of the parallel feedback oscillator using a transmission-type high-Q resonator and a GaAs FET low noise amplifier.
Consequently, high-Q resonators provide huge enhancement to other characteristics of devices exploiting the resonance effects, e.g., material characterization tools [6-9], biological and chemical sensors [10] (the latter can detect a single nanoparticle [11] or even a single atom [12]), ultralow threshold and super-directional lasers [13, 14], and so on.
This idea is being pursued in a class of novel high-temperature-superconducting tunable microwave devices such as microstrip line phase shifters, high-Q resonators and tunable filters.