The phrase "at a frequency equal" is correct and usable in written English.
It can be used in contexts related to science, engineering, or any discussion involving measurements or comparisons of frequencies.
Example: "The two signals were transmitted at a frequency equal to 2.4 GHz."
Alternatives: "at an equal frequency" or "at a frequency that matches".
The source of the voltage is an oscillator similar to a radio transmitter that operates at a frequency equal to the frequency of revolution of the particles in the magnetic field.
The excitation is set at a frequency equal to that of a natural frequency of the non-rotating shell.
The cracked rotor is excited axially using an electrodynamic exciter at a frequency equal to its bending natural frequency in both non-rotating and rotating conditions.
In these conditions, the light sources appear to oscillate in space at a frequency equal to the difference between the vibration and flicker frequencies.
The purpose of the spectral analysis of a numerically represented nucleotide sequence is to compute its period-3 spectral component located at a frequency equal to 2π/3 in the DFT spectrum.
TMS at a frequency equal to or below 1 Hz has the effect of depressing cortical excitability for a short period of time after each pulse [34].
R0 refers to the resistance to an electrical current at a frequency theoretically equal to zero, as with a continuous direct current.
Expression of Mic12 in addition to Mic10, however, supported the formation of Mic27-EGFP substructures at a frequency almost equal to that observed in ∆ mic19 or ∆ mic60 cells (compare Figure 3D,3F).
Figure 6 shows several harmonics at a frequency spacing exactly equal to the fundamental frequency of 2.21 MHz.
As seen from Figures 3 and 4, there are three prominent peaks located at frequency equal to 0, 2π/3, and 4π/3.
For the Codes 9-16, their numerical represented sequences x[n] are complex; therefore, DFT spectrum shows non-symmetrical peaks at frequency equal to 2π/3 and 4π/3.
