ECHO Microwave's cavity high pass filters reject low-frequency signals with high attenuation while passing all frequencies above the cutoff with minimal loss. Cavity construction provides a significant advantage over lumped element designs at higher frequencies, delivering steeper rejection slopes and better power handling in demanding RF environments. These filters are used to define the lower operating boundary of wideband receivers, block out-of-band interference from lower-frequency transmitters, and protect sensitive front-end components in multi-system installations. Available from 100 MHz to 40 GHz with power handling up to 1KW, our cavity high pass filters support applications across commercial wireless infrastructure, navigation radar, and military communication and electronic warfare systems. Custom designs with specified cutoff frequencies, rejection profiles, and connector configurations are available.