Study on phase velocity tapered microstrip angular log‐periodic meander line travelling wave tube

Abstract

To improve the efficiency of beam‐wave interaction and the gain of the microstrip angular log‐periodic meander‐line (MALPML) travelling wave tube (TWT), a modified phase velocity tapered MALPML (PVT‐MALPML) with 45° chamfer is proposed in this study. Compared with MALPML slow wave structure (SWS), the PVT‐MALPML SWS has better transmission characteristics. Meanwhile, the beam‐wave interaction simulation results show that a higher gain and electron efficiency can be produced by the PVT‐MALPML TWT. By using the novel PVT‐MALPML SWS, the properties of the radial TWT is further improved to meet the requirements of electronic system to TWTs.

Millimeter wave traveling wave tubes for the 21st Century

“…In the following, the most interesting interaction structures for millimeter wave TWTs, the folded waveguide, the double staggered grating, and the double corrugated waveguide, will be described including their application in state-of-the-art TWTs. Other SWSs have been proposed, such as meander lines [91][92][93][94][95][96][97][98] or planar helices [99], but no TWT was so far designed to be built, so they will be not considered in the following.…”

Microstrip angular log‐periodic slow wave structure on quartz substrate with coaxial input/output coupler

“…In [20], the TC results are based on the MALPML SWS with ten periods. However for more periods, the TC is poor with same structure parameters.…”

“…As shown in Fig. 15, the whole SWS are divided into five sections [20]. The purpose of this method is to obtain more accurate results and provide the reference for the optimisation of phase velocity tapering.…”

“…The optimised design of the MALPML SWS, which utilised the technology of phase velocity tapered and right angle bend method [20], was used to improve the properties of transmission characteristic (TC) and beam‐wave interaction efficiency. As the key part of the prototype TWT with the MALPML SWS, the angular radial sheet beam electron gun and the fan shaped radial tuneable periodically cusped magnetic (PCM) focusing system were designed, manufactured and tested [21].…”

Study on Silicon-Based Conformal Microstrip Angular Log-Periodic Meander Line Traveling Wave Tube

“…The proposed microstrip ALPML mentioned in [9,10] consists of a winding metal strip on the top of a planar dielectric substrate. The planar dielectric substrate not covered by the microstrip meander lines would influence the interaction between the electromagnetic wave and electron beam.…”