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Waveguide Calculator Rectangular

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Rectangular Waveguide Calculator | Cutoff Frequency & Operating Range
Please enter or select a valid waveguide dimension greater than 0.
RESULTS
FREQUENCY (CUTOFF)
GHz
RANGE (OPERATING)
GHz

Rectangular Waveguide Structure

A rectangular waveguide is a hollow metallic pipe used to guide high-frequency radio waves, specifically microwaves. The dominant mode of propagation is typically the TE10 mode, which depends exclusively on the inner broad wall dimension.

Broad Wall (a) Height (b) Propagation Axis

Formulas & Mathematical Logic

The system calculates parameters for the fundamental lowest-order transverse electric mode (TE10) where height requirements are non-restrictive to cutoff thresholds:

Cutoff Frequency (fc):
fc = c / (2 * a)

Where 'c' is the speed of light (approximately 2.99792458 x 10^8 m/s) and 'a' is the internal broad wall width dimension converted to meters.
Recommended Operating Range:
Lower Bound = 1.25 * fc
Upper Bound = 1.89 * fc

Practical Calculation Example

Input Parameters

Selected Waveguide: WR90

Broad Wall Width (a): 0.900 inches

Determined Output Data

Cutoff Frequency: ~6.56 GHz

Ideal Bandwidth: 8.20 GHz to 12.40 GHz

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About this tool

Waveguide Calculator Rectangular is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.