Abstract
The advantages of using photonic band gap structures in vacuum electron devices are discussed. Their excellent mode selective properties permit them to be used as overmoded interaction structures in microwave tubes for either high power (>10 MW) or extremely high frequency (>100 GHz) operation. Two proof‐of‐principle experiments recently conducted at MIT namely, a 17 GHz PBG resonator with a TM010‐like mode for potential applications in accelerators and conventional slow wave devices and a 140 GHz highly overmoded gyrotron with a TE041‐like mode PBG resonator are presented. A brief outline of the theory of PBG structures and some of their additional applications in microwave vacuum electronics are also discussed.
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