In view of the mechanical constraints this means that waveguides are only used for microwave frequencies. If the wavelength is too long, then the waveguide will not operate in a mode whereby it can carry the signal.Īs might be imagined, the cut-off frequency depends upon its dimensions. In order to carry signals a waveguide needs to be able to propagate the signals and this is dependent upon the wavelength of the signal.
Waveguides will only carry or propagate signals above a certain frequency, known as the cut-off frequency.īelow the waveguide cutoff frequency, it is not able to carry the signals. In view of the critical nature of the cut-off frequency, it is one of the major specifications associated with any waveguide product. When choosing a waveguide it is important to bear this frequency in mind, especially if any changes to the system may be likely. Below this cut-off frequency the waveguide is unable to support power transfer along its length. Waveguide basics Waveguide modes Waveguide impedance & matching Waveguide cut-off-frequency Waveguide flanges Waveguide junctions Waveguide bends Flexible waveguide Waveguide types & sizesĪs a result of the way in which waveguides operate, all waveguides have a cut-off frequency. Waveguide Cutoff Frequency Waveguides have a minimum or cut-off frequency below which they are unable to operate.
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