Author(s)

Heather Song, Leslie Tekamp, Frank Francisco, Ming-Chieh Lin, Peter H. Stoltz, David Smith, Gil Wong Choi, Jin Joo Choi

Department of Electrical and Computer Engineering, University of Colorado, Colorado Springs, USA.
Department of Electrical and Computer Engineering, University of Colorado, Colorado Springs, USA;.
Department of Electronics Convergence Engineering, Kwangwoon University, Seoul, South Korea..
Samsung Thales Co., Yongin-Si, South Korea;.
Tech-X Co., Boulder, USA;.
Triton Services Inc., Breinigsville, USA;.

A new class of compact and lightweight S-band 1 kW traveling-wave tube (TWT) is being developed for a microwave power module (MPM) that will be used for phased antenna array radar applications. The proposed S-band MPM provides a tenfold peak power increase compared to state-of-the-art S-band MPMs. In this paper, the design of the vacuum power booster TWT part of the MPM is presented. The compact and lightweight S-band TWT is driven by a 6 kV, 0.9 A electron beam. The amplifier is predicted by large-signal simulations to generate over 1 kW at S-band with 25 dB saturated gain and over 40% efficiency. The stability from unwanted oscillations has been investigated. To suppress the oscillations, the helix circuit has been coated with carbon composite material. The coaxial input and output antennas have been fabricated. For efficiency enhancement, a multi-stage depressed collector (MDC) has been designed using a 3D particle-in-cell (PIC) simulator, VORPAL. The collector design makes use of a current loop based on a feedback mechanism for effective design process. The integrated designs of a helix circuit, an electron gun, a periodic permanent magnet (PPM), antennas, and a collector are presented.

TWT; MPM; Compact; Lightweight; Feedback Current Loop; Multi-Stage Collector

H. Song, L. Tekamp, F. Francisco, M. Lin, P. Stoltz, D. Smith, G. Choi and J. Choi, "Integrated Design of a Compact and Lightweight S-Band Traveling-Wave Tube Amplifier for a New Class of Microwave Power Module," Journal of Electromagnetic Analysis and Applications, Vol. 5 No. 3, 2013, pp. 96-102. doi: 10.4236/jemaa.2013.53016.