Crossed-Field Devices are high-power devices and are associated with high efficiency, small weight, adequate bandwidth and good performance as regards various parameters such as phase coherence, jitter, fast frequency sweep and phase versus frequency. Distributed-emission type devices using cold secondary emitter cathode have the advantage of no heater requirement and thereby stand-by requirements are eliminated. Use of platinum as secondary emitter is anticipated to result in 100 000 hours of life of crossed-field devices. In linear format costly modulator is not required and this device provides the flexibility of sophisticated wave shape pattern generation. A number of tubes can be operated in parallel resulting in high output power and at the same time providing redundancy to prevent a total system failure if one tube fails. Same tube type with power dividers can be used as a driver as well as the PA, thereby simplifying the logistics. Life of microwave tubes can be significantly increased and maintenance problems reduced by proper care and handling of these devices.
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