The Agilent 85021B directional bridge is designed to operate with either the 8756 or 8755 in AC detection mode. This bridge offers high directivity, excellent test port match, and a measurement range of up to 26.5 GHz in coax.
It has a frequency range of 10 MHz to 26.5 GHz. The 85021B has a APC-3.5(f)) test port with directivity of >40 dB from 40 MHz to 20 GHz and >36 dB to 26.5 GHz.