where L is the overall inductance of the resonator circuit and C its total capacitance. Several resonator designs have been published in the literature for low frequency EPR spectroscopy and imaging. 149–159 Birdcage and Litz coils (both in NMR and EPR) as well as other structures with distributed inductances and capacitances (known as lumped circuit elements) have been …

The WG resonator is essentially “oversized” for millimeter wavelengths and thus enables the designer to use larger structures. In case of an NRD-guide resonator, the dielectric block may be in the form of a rectangle made of a relatively low permittivity and low-cost dielectric material. Thus, size is not a problem.

A resonator, in this cotext, is any device in which a wave can travel back and forth between reflectors.At frequencies above ∼1 MHz a convenient implementation (Fig. 2) is a plate of piezoelectric material, crystal or ceramic, as the transmission medium for sound waves, with force-free end faces at which the sound waves, with force-free end faces at which the sound …

Jan 25, 2015 · The resonator is a zero-level packaged polysilicon free-free resonator operating at 25.6 MHz and exhibiting a Q-factor of 334 with a motional resistance of 5 MΩ when biased at 7 V. In this case, an additional mask is required to protect aluminum pads during metal deposition for …

Dec 16, 2024 · Resonator A with the four-ring spoke array and relatively smaller support radius has a Q value up to 91000 in vacuum, resulting in an f × Q product of 2.14 × 10 12, while the resonator B without four-ring spoke array achieves Q value of 16900 Simultaneously, the motional impedance 30.34 kΩ of resonator A is only about one-fifth of that of ...

The resonator must contain a neck connected to the cavity filled with a large volume of fluid. The large volume of fluid acts as the spring, while the neck acts as the mass. For the specific shape of the Helmholtz resonator example used here (see Fig. 24), the natural frequency of a 2-D Helmholtz resonator as given by Mechel (2013) is approximately

Feb 1, 2025 · Each FP resonator enhances acoustic pressure at specific frequencies determined by its geometry, creating a frequency-dependent amplification effect. Moreover, the narrow channels formed by the ring pairs also introduce additional acoustic losses, which accumulate as the sound propagates through the structure, becoming more pronounced in gaps ...

Dec 1, 2017 · The theoretical formula for the Helmholtz resonator is (1) f = c 0 2 π S V · l a where f is the resonant frequency, C 0 is the velocity of sound in the air, S is the cross-sectional area of the short tube, V is the volume of the acoustic cavity, and l a is the total length of the short tube, the actual length of the short tube is l. l a is l ...

Jan 2, 2025 · The frequency and Q factor of the resonator were measured in ambient atmosphere. The 11.65 MHz resonator exhibited a Q value of 15,000, while the 23.98 MHz resonator showed a Q value of 17,600. In high vacuum of 0.08 mbar, the Q value for the 11.65 MHz resonator increased to 102,100, while the 23.97 MHz resonator achieved a Q value of …

Jan 1, 1998 · The scattering and absorption effects of a quarter-wave resonator can be illustrated by particle velocity vectors in 124 C. D. Field, F. R. Fricke the field of a plane wave normally incident on a Helmholtz resonator at resonance.5 Fahy5 also reports that examination of the reactive component of intensity in the vicinity of the resonator neck ...