Optimum placement of D.C. blocks in ultra broad band M.W. receivers

Ultra broad band MW receivers are used in some airborne systems. Antennas covering multioctave frequencies are mounted at convenient locations on the aircraft. The receivers are kept as close to the antennas as possible. Video outputs from these receivers are carried to signal processor units located at different places in the aircraft. Single point grounding is used many times to avoid loop currents interfering with genuine signals. In such systems single point grounding calls for isolation of some of the hardware from the aircraft. Inner/outer DC blocks help in isolating microwave hardware. This paper discusses, as a case study, the optimum placement of DC blocks in ultrabroad band microwave receivers