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WG and WR waveguide dimensions and sizes

- RF waveguide dimensions, waveguide sizes, cut off frequencies and other waveguide data for WR waveguide and WG waveguide systems.

This waveguide tutorial is split:
[1] Waveguide basics
[2] Waveguide theory
[3] Waveguide impedance
[4] Flexible waveguide
[5] Waveguide couplers and transitions
[6] Waveguide dimensions and sizes
[7] Waveguide flanges
[8] Waveguide junctions
[9] Waveguide directional coupler
[10] Waveguide bends

RF waveguides used for the transmission of radio frequency energy come in a variety of sizes and designations such as WG waveguide and WR waveguide are seen in the specifications and literature.Waveguide sizes and waveguide dimensions determine the properties of the RF waveguide, including parameters such as the waveguide cut off frequency and many other properties.

Waveguide sizes are standardised to enable waveguides from different manufacturers to be used together. In this way the industry is able to benefit from the ability to use waveguide with known properties, etc.

Waveguide size standards

There are a number of different standards for waveguides. These tend tob e country specific. Some of the major standards include:

WR waveguide system: EIA designation (Standard US) using a WR designator to indicate the size
WG waveguide system: RCSC Designation (Standard UK)

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

WG waveguide sizes and dimensions

The figures given below are for rigid rectangular waveguides, as these are the most common form of waveguide used.

WG Design	Freq range*	Waveguide cut off *	Theoretical attn dB / 30m	Material	Band	Waveguide dimensions (mm)
WG00	0.32 - 0.49	0.256	0.051 - 0.031	Alum	B	584 x 292
WG0	0.35 - 0.53	0.281	0.054 - 0.034	Alum	B,C	533 x 267
WG1	0.41 - 0.625	0.328	0.056 - 0.038	Alum	B,C	457 x 229
WG2	0.49 - 0.75	0.393	0.069 - 0.050	Alum	C	381 x 191
WG3	0.64 - 0.96	0.513	0.128 - 0.075	Alum	C	292 x 146
WG4	0.75 - 1.12	0.605	0.137 - 0.095	Alum	C,D	248 x 124
WG5	0.96 - 1.45	0.766	0.201 - 0.136	Alum	D	196 x 98
WG6	1.12 - 1.70	0.908	0.317 - 0.212	Brass	D	165 x 83
WG6	1.12 - 1.70	0.908	0.269 - 0.178	Alum	D	165 x 83
WG7	1.45 - 2.20	1.157			D,E	131 x 65
WG8	1.70 - 2.60	1.372	0.588 - 0.385	Brass	E	109 x 55
WG8	1.70 - 2.60	1.372	0.501 - 0.330	Alum	E	109 x 55
WG9A	2.20 - 3.30	1.736	0.877 - 0.572	Brass	E,F	86 x 43
WG9A	2.20 - 3.30	1.736	0.751 - 0.492	Alum	E,F	86 x 43
WG10	2.60 - 3.95	2.078	1.102 - 0.752	Brass	E,F	72 x 34
WG10	2.60 - 3.95	2.078	0.940 - 0.641	Alum	E,F	72 x 34
WG11A	3.30 - 4.90	2.577			F,G	59 x 29
WG12	3.95 x 5.85	3.152	2.08 - 1.44	Brass	F,G	48 x 22
WG12	3.95 x 5.85	3.152	1.77 - 1.12	Alum	F,G	48 x 22
WG13	4.90 - 7.05	3.711			G,H	40 x 20
WG14	5.85 - 8.20	4.301	2.87 - 2.30	Brass	H	35 x 16
WG14	5.85 - 8.20	4.301	2.45 - 1.94	Alum	H	35 x 16
WG15	7.05 - 10.0	5.26	4.12 - 3.21	Brass	I	29 x 13
WG15	7.05 - 10.0	5.26	3.50 - 2.74	Alum	I	29 x 13

WG waveguide dimensions, sizes and waveguide cut-off frequencies
for rigid rectangular RF waveguides

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

US WR waveguide sizes

The WR waveguide designation system is used within the USA and is also widely used in many other areas around the globe. 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)
WR340	WG9A	2.20 - 3.30	3.400 x 1.700
WR284	WG10	2.60 - 3.95	2.840 x 1.340
WR229	WG11A	3.30 - 4.90	2.290 x 1.150
WR187	WG12	3.95 - 5.85	1.872 x 0.872
WR159	WG13	4.90 - 7.05	1.590 x 0.795
WR137	WG14	5.85 - 8.20	1.372 x 0.622
WR112	WG15	7.05 - 10.00	1.122 x 0.497
WR90	WG16	8.2 - 12.4	0.900 x 0.400
WR75	WG17	10.0 - 15.0	0.750 x 0.375
WR62	WG18	12.4 - 18.0	0.622 x 0.311
WR51	WG19	15.0 - 22.0	0.510 x 0.255
WR42	WG20	18.0 - 26.5	0.420 x 0.170
WR28	WG22	26.5 - 40.0	0.280 x 0.140
WR22	WG23	33 - 50	0.224 x 0.112
WR19	WG24	40 - 60	0.188 x 0.094
WR15	WG25	50 - 75	0.148 x 0.074
WR12	WG26	60 - 90	0.122 x 0.061

WR waveguide dimensions, sizes and waveguide cut-off frequencies
for rigid rectangular RF waveguides

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.

Summary

The waveguide dimensions are of great importance as they determine the operating range of the waveguide. The standard waveguide sizes also enable complete coverage of the frequency spectrum, and choice of the particular waveguide size for a given application should take account of the frequency range required as well as other considerations including loss, mechanical size and weight, etc..

Further pages from this tutorial
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