The design of an inter-digital structure for TWTs

A design procedure for an inter-digital slow-wave structure for TWTs is presented using equivalent circuit approach. The results are refined using numerical simulations by modeling the structure using the software package MAFIA. The dimensions of the inter-digital structure are compared with those of a conventional coupled-cavity slow-wave structure designed at the same center frequency. It is concluded that the size and weight of the inter-digital structure is significantly reduced as compared to that of a coupled-cavity structure.