This LC highpass filter has a cutoff frequency of 6 GHz, passband of 6 to 18 GHz, insertion loss in the passband of less than 1 dB, and ripple in the passband of less than 0.1 dB. Rejection from DC to 6 GHz is greater than 50 dB. The compact unit measures 0.75 X 0.625 X 0.5 in. and uses SMA connectors.