Figure 8
From: Multiple-beam and double-mode staggered double vane travelling wave tube with ultra-wide band
Photos of the fabrication structure outside (a), inside (b) and (c). (a) The port in the left is corresponding to Port 1 in Fig. 6 and the right one is Port 3. (b) Eight pairs of small matching round holes and eight short copper bars are adopted at the edge of the structure. (c) Local enlarging photo of three pencil beam tunnels.
