The phrase "frequency close to" is grammatically correct and can be used in written English.
It is commonly used to describe the proximity or similarity of frequencies. Example: "The radio station's frequency is close to 100 MHz, making it easy to tune in."
In this coupling process, radio emissions are generated at the frequency close to the plasma frequency.
Groan frequency close to cavity acoustic resonance constitutes the worst case scenario, and has to be avoided.
The forcing is harmonic, with a frequency close to the natural frequency ωkn of one asymmetric mode of the plate.
Mild surge occurs independently or appears within a deep surge cycle with a frequency close to the Helmholtz resonant frequency of the compression system.
Conclusion: To optimize myocardial contrast opacification, intraoperative transesophageal echocardiography should be performed with intermittent sampling at a transducer frequency close to the intrinsic frequency of the contrast agent.
When the engine control is used, the proposed control strategy maintains the frequency close to the reference, 60 Hz, with a maximum Δf of −0.23 %.
Sub-wavelength metallic structures, when illuminated with a frequency close to the plasma frequency of the metal, present resonances that cause extreme local field enhancements.
The non-linear forced vibrations of circular plates, with the excitation frequency close to the natural frequency of an asymmetric mode, are investigated.
The oil whirl phenomenon occurs when the journal bearings are lightly loaded and the shaft is whirling at a frequency close to one-half of rotor angular speed.
A truck-trailer system is assumed, equipped with an external excitation at a frequency close to one of the bridge natural frequencies.
A previous conclusion that coincidence occurs at a frequency close to the cut-off frequency of the acoustic mode involved is confirmed.
