Comparative study of envelope models for hybrid time- and frequency-domain simulation of traveling-wave tubes. Issue 5 (3rd April 2018)

• Record Type: Journal Article
• Authors: Safi, Djamschid; Birtel, Philip; Meyne, Sascha; Jacob, Arne F.
• Editors: Kallfass, Ingmar; Vossiek, Martin; A. Hein, Matthias
• Is Part Of: International journal of microwave and wireless technologies. Volume 10:Issue 5/6(2018)
• Page Start: 521
• Page End: 529
• Publication Date: 2018-04-03
• Subjects: Power amplifiers, -- Computer-aided design; Wireless communication systems -- Periodicals; Microwave circuits -- Periodicals; Radio frequency -- Periodicals; 621.381305
• DOI: 10.1017/S1759078717001349
• Languages: English
• ISSNs: 1759-0787

Abstract

Abstract : A selection of hybrid frequency- and time-domain approaches is evaluated with respect to their suitability for predicting the multi-tone behavior of a reference Ku-band helix traveling-wave tube. For this, a frequency-domain code is extended by a selection of frequency-dependent and frequency-independent envelope models and compared to a number of simulated and measured responses to two-tone signal excitation with varying frequency spacing. The selected envelope methods are investigated both in the hybrid approach and based on measured TWT characteristics. Output levels and classical multi-tone metrics, such as intermodulation products and phase transfer factors, are considered. By reducing a modulation scenario to a number of significant sequences, a comparison to full physics-based frequency-domain simulation is presented to show the potential of the proposed approach.