The wide variety of flanges detailed here are available as standard on the majority of our products.
The wide variety of flanges detailed here are available as standard on the majority of our products. The flanges are based on the major international flange interface specifications and we also have many of the more obscure standards and customer specific flanges on record.
Standard flanges are available in Brass or Aluminium and other materials on request. Certain designs are available from stock to provide a minimum delivery lead-time.
We offer technical support at the design stage to ensure the most suitable flange is chosen for every application.
All flanges are manufactured to the highest quality standards
Download the flange guide specifications for more details.
There are 3 flange types - the plain, the “O” ring and the choke.
Plain flange - UBR
It has a flat face – it is also sometimes called a plain or a cover flange.
When mated to another plain or ‘O’ ring flange it gives the best match performance. It can be used with either an ‘O’ ring flange, a choke flange or another plain flange
”O” ring flange PBR
It has a flat face with a groove cut in it to take an ‘O’ ring for environmental or pressure sealing. It is used together with a plain flange.
It is permissible, but not recommended, to use with another PBR flange and “O” ring.
Choke flange - CBR
It has 2 grooves cut into it. The outer groove is for an ‘O’ ring (the same as the PBR flange). The inner groove is the choke and the region between the waveguide aperture and the inner groove is sub flush. The distance from the waveguide to the bottom of the choke groove is ¼ wavelength so the reflection presents a short circuit at the waveguide.
It must be used together with a plain flange, and is used in very high power systems.
It essential that the flange is aligned precisely to minimise the return loss degradation.
If the flange is correctly aligned and used at the frequency the choke is designed for (typically the band centre) then it offers the best leakage performance (but the worst match performance - it is possible to achieve similar leakage performance using rf shims without the degradation in match.)
To find a particular flange, start by viewing the waveguide sizes below. These are the more common flanges but we have a large library of flange standards on record.
The flange and waveguide materials should match i.e. aluminium flanges for aluminium waveguide or brass flanges for copper or brass waveguide.
A choke flange must be used together with a plain flange - it is usually used for very high powers to improve the apparent contact of the joint, but as the choke is frequency sensitive, the match seen at the top and bottom of the band is generally worse than a plain / plain combination. .An alternative to a choke / plain joint for high powers is a plain / plain joint together with a high power shim. The shims are generally crushable (single use) or have sprung fingers to ensure good contact. Choke flanges are more sensitive to misalignment so the correct bolts should be used - fixing kits can be supplied to suit.
For more details and prices please use the product enquiry form or contact our sales team.
Download the Flanges (Flat, Groove and Choke) specifications.
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