A. Introduction
High power millimeter wave instrumentation radars have a number of important applications ranging from defense missions to basic scientific studies [1], [2]. At the Naval Research Laboratory, a new high power 94 GHz radar named WARLOC has been developed. This radar employs a high power gyro-klystron as the final power amplifier and was developed during 1996–2001. The WARLOC radar has been integrated as a transportable system, using the 100 kW peak, 10 kW average power gyro-klystron amplifier, a low-loss transmission line, a quasioptical duplexer, and a Cassegrain antenna. The transmitter operation and waveguide system is the subject of this paper. The system is housed in two trailers as shown in Figure 1. The larger trailer, with the antenna pedestal mounted at one end, houses the full transmitter and the auxiliary cooling systems for the radar. The smaller van contains operator controls and the signal processing and computer systems.