Kathrein-Werke KG is a German manufacturer of antenna systems and related electronics.
The company was founded in Rosenheim (Upper Bavaria) in 1919 and is still headquartered there.
[1] It is the world's oldest and largest antenna manufacturer, valued at about $1.8 billion in 2015.
Kathrein produces antennas for GSM and UMTS mobile radio towers and for various car manufacturers such as BMW.
In February 2019 it became known that the core business with mobile phone antennas and filters would be sold to the Swedish network supplier Ericsson.