The AE19000SSL1026 from Anatech is a low pass filter with a passband from DC to 19 GHz. It has an insertion loss of less than 3 dB across the passband and can handle up to 15 watts of power. The filter provides an attenuation of over 50 dB from 20.1 to 26 GHz. It is available in a module that measures 17 x 17 x 10 mm with SMA (F) connectors.