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The phrase "a certain frequency" is correct and usable in written English.
It can be used when referring to a specific but unspecified frequency in various contexts, such as science, music, or communication.
Example: "The device operates at a certain frequency that allows it to transmit signals effectively."
Alternatives: "a specific frequency" or "an unspecified frequency".
Exact(60)
A sign on the lawn instructs viewers to tune their car radios to a certain frequency.
Certain filters pass frequencies below a certain frequency while attenuating all frequencies above it, others pass all frequencies above a certain frequency while attenuating all frequencies below it.
When Bray made a sound with a certain frequency, Wever heard the sound from the receiver at the same frequency.
The poet Jack Spicer famously compared the poet to a radio: when the writer is really listening in, he or she simply receives transmissions at a certain frequency.
The electromagnetic bandgap (EBG) effect in metasurfaces prevents all surface modes from propagating in a certain frequency band.
At a certain frequency, the velocity of a microwave traveling through a media depends on the permittivity of that media.
Two regions are separated by a local band gap that blocks the incident light for a certain frequency interval.
However, analysis by other authors has shown that the radiation deviates from omni-directional above a certain frequency.
Photonic crystals are periodic dielectric structures that have a band gap that forbids propagation of a certain frequency range of light.
To have it play different sounds we set OCR1A to play a certain frequency and the Z register is a counter for the duration of the sound.
As the swing will be oscillating up and down at a certain frequency, the objective is to impart the external force into the system at the natural frequency.
More suggestions(19)
a certain timing
a clear frequency
a certain cycle
a safe frequency
a certain band
a particular frequency
a certain periodicity
a certain prevalence
a precise frequency
a certain incidence
a certain clock
a certain degree
a certain regularity
a certain intensity
a certain range
a certain spectrum
a certain rate
a certain often
a specified frequency
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com