Inside Wireless: Waveguide

In this episode of Inside Wireless, you'll learn everything you need to know about Waveguide - what it is, what shapes of a Waveguide do we usually use in which applications and how they differ from Coaxial Cables.

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A Waveguide is a type of transmission line, like a coaxial cable. It allows electromagnetic energy to travel through it and transport it from point A to point B. It is a hollow metallic tube and can have various shapes: circular, single ridge, double ridge, elliptical or rectangular. The size of the Waveguide is determined by the frequency we want to use. The lower the frequency, the larger the Waveguide is.

Unlike coaxial cables, Waveguides work as high pass filters. They do not let low frequency electromagnetic waves travel through, below what is called a Cutoff Frequency. Above this frequency, signal travels freely in what is known as the first Transverse Electric mode.

Coaxial Cables always suffer from higher losses than Waveguides. Another advantages of Waveguides are external noise immunity and high mechanical durability.

Waveguides are particularly useful in high-power applications or whenever a very low loss is beneficial.

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00:00 - What is a Waveguide
00:32 - Cutoff Frequency
01:21 - Waveguide size
01:43 - Waveguide Applications

Correction: 00:34 Waveguides work as high pass filters.

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