Waveguide Tutorial Includes:
The most common series are the WG and WG waveguide standards. Waveguide sizes and waveguide dimensions determine the properties of the waveguide, including parameters such as the waveguide cut off frequency and many other properties.

• WR waveguide system:   EIA designation (Standard US) using a WR designator to indicate the size. The designator for a size consists of the letters WR followed by numerals indicating the lowest frequency for which they were designed for use. The letters WR stand for Waveguide Rectangular.
• WG waveguide system:   RCSC Designation (Standard UK). The waveguides types are given designators which comprise the letters WG followed by one or two numerals, e.g. WG10.

Both systems are in widespread use and enable the waveguide sizes to be matched and known.

WR waveguide sizes & designations

The WR waveguide designation system is used within the USA and is also widely used in many other areas around the globe. It is popualr because many WR series waveguide parts are made within the USA and these are widely exported. Like the WG waveguide sizes, the WR waveguide designations start with the letters WR.

WR DESIGNATION

WG EQUIVALENT

STANDARD FREQ RANGE GHZ

INSIDE DIMENSIONS (INCHES)

It can be seen from the table that the WR number is taken from the internal measurement in mils of the wider side of the waveguide.

WG waveguide sizes and dimensions

The details including cut-off frequency as well as the waveguide dimesions and sizes are given below are for some of the more commonly used rigid rectangular waveguides.

WG DESIGN

FREQ RANGE*

WAVEGUIDE CUT OFF*

THEORETICAL ATTN

DB/30M

MATERIAL

BAND

WAVEGUIDE DIMENSIONS (MM)

* waveguide cut off frequency in GHz and for TE10 mode
Alum = Aluminium