Quantic PMI Model PVAN-100M300M-20-SFF is a voltage-controlled attenuator that operates over the 0.1 to 0.3 GHz frequency supplying 20 dB of attenuation typically with 0 to -5 V control with <1.5 dB of insertion loss and a VSWR of <1.5:1 in the 0 V state. Package size is 1.25" Sq x 0.5" with SMA female connectors.