This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Waveguidepostfilter. en Fiveresonator triplepost waveguide bandpass filter made by Ferranti length of WG WR is divided into five coupled resonant cavities by fences of three posts each Each of the two endcavities is separated from its respective port by single post and short adjustment screw The ends of the posts protrude through