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TRAVELING-WAVE TUBE HAVING AUXILIARY RESONANT CAVITIES CONTAINING LOSSY BODIES WHICH PROTRUDE INTO THE SLOW-WAVE STRUCTURE INTERACTION CELLS TO PROVIDE COMBINED FREQUENCY SENSITIVE AND DIRECTIONALLY SENSITIVE ATTENUATION
TRAVELING-WAVE TUBE HAVING AUXILIARY RESONANT CAVITIES CONTAINING LOSSY BODIES WHICH PROTRUDE INTO THE SLOW-WAVE STRUCTURE INTERACTION CELLS TO PROVIDE COMBINED FREQUENCY SENSITIVE AND DIRECTIONALLY SENSITIVE ATTENUATION