Laser and Particle Beams

Research Article

Design of a dual-band power combining architecture for high-power microwave applications

Qiang Zhanga1 c1, Chengwei Yuana1 and Lie Liua1

a1 College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China

Abstract

The remaining challenges, confronting the limited output peak power level of high-power microwave (HPM) sources, stimulate the development of power combining system. This paper reports the design methods and numerical results for a kind of dual-band incoherent power combining architecture applied in HPM. It is particularly effective to radiate dual-band microwave simultaneously, generated by a coaxial dual-band HPM source or two separate HPM sources of different bands. Two types of mode conversion structures, i.e., a dual-band feed line with co-aligned ports and a dual-band feed line with off-aligned ports, are proposed, where coaxial output port itself is adopted to connect the coaxial dual-band horn feed. These two types of feed lines provide a high conversion efficiency of about 98% from TEM or TM01 mode to TE11 mode and a bandwidth of about 10% at each band. The horn feed, with a high power handling capacity, is compact, and a good far-field radiation pattern at each band has been achieved by combining horizontal and vertical corrugations. Thus, the dual-band radiation system has not only realized incoherent power combination, with higher output peak power level, but also is suitable for feeding of, e.g., offset shaped single-reflector antennas in dual-band HPM systems in the future.

(Received November 02 2009)

(Accepted May 01 2010)

Keywords

  • Corrugated horn feed;
  • Dual-band feed;
  • High-power microwaves;
  • Mode converters;
  • Power combination;
  • Simulation

Correspondence:

c1 Address correspondence and reprint requests to: Q. Zhang, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China. E-mail: zqiang1984@163.com