Model F-17281 from RLC Electronics is an interdigital bandpass filter with passband from 20 to 40 GHz. The center-frequency insertion loss is better than 1 dB and typically 0.6 dB, while the VSWR is better than 2.0:1 measured at the center frequency. The typical lowside rejection is 40 dB from DC to 14.5 GHz while the typical highside rejection is 40 dB at 48.5 GHz. The ultimate rejection is better than 20 dB through 60 GHz. The bandpass filter is supplied in a rugged housing with 2.4-mm male and female coaxial connectors; it measures only 0.91 x 0.38 x 0.30 in.