What is a Waveguide Flange?

A Waveguide Flange is the connection interface of a waveguide section. When joining two waveguide sections the flange types must match to ensure minimal losses. Waveguide flanges can be either square or circular. Flanges are usually connected to each other using four or more bolts to keep connection intact. To ensure consistency and compatibility across manufacturers, there are two main standard bodies for rectangular waveguide flanges - North American EIA (Electronic Industries Alliance) Waveguide Flange Shapes and IEC (International Electrotechnical Commission) Waveguide Flange Shapes. The shapes and configurations for both standards have been shown below.

North American EIA Waveguide Flange Shapes
Contact Grooved	CPR	CMR
Square Cover	Round Cover	CPR Grooved
Choke	Square Cover Grooved	Round Cover Grooved

IEC Waveguide Flange Shapes
CAR	UDR	UER
UBR	UAR	PDR
CBR	PBR	PAR