Analysis and design of a novel dual-band coaxial waveguide mode converter for high-power microwave applications

ABSTRACT

Based on the derived coupling coefficients of the circular waveguide and coaxial waveguide, a novel dual-band serpentine coaxial mode converter is proposed in this paper. This dual-band converter consists of two parts: an inner inserted circular waveguide TM₀₁-TE₁₁ converter operating at Ka-band, and an outer coaxial waveguide TEM-TE₁₁ converter working at Ku-band. The inner and outer converters have the same curvature distribution along the propagation direction with a structure length of 800 mm. Simulated results exhibit that the maximum conversion efficiencies of the inner and outer converters reach 98.7% and 98.9% at 35 and 15 GHz, respectively. The bandwidths of the inner and outer converter are 1.9 and 2.5 GHz when the conversion efficiency is over 90%. Furthermore, the dual-band mode converter has a symmetry and reciprocity structure with coaxial-parallel input/output port. The good agreement between theoretical calculations and simulation demonstrates the feasibility of this design.

KEYWORDS:

• Coaxial waveguide
• circular waveguide
• dual-band
• mode converter
• high power microwave

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported in part by the National Natural Science Foundation of China under Grant 61671132, and in part by the Fundamental Research Funds for the Central Universities of China under Grant ZYGX2015J036.

Notes on contributors

Keqiang Wang

Keqiang Wang is currently pursuing the PhD degree in the University of Electronic Science and Technology of China, Chengdu, China.

Hao Li

Hao Li received the PhD degree in physical electronics from the University of Electronic Science and Technology of China (UESTC), Chengdu, China, in 2009. He is currently with the UESCT.

Tianming Li

Tianming Li received the PhD degree in physical electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 2005. From 2011 to 2012, he was a Senior Visiting Fellow with the College of William and Mary, Williamsburg, VA, USA. He has been with the UESCT.

Yong Luo

Yong Luo received the PhD degree in physical electronics from the University of Electronic Science and Technology of China (UESTC), Chengdu, China. He is currently with the UESTC.

Haiyang Wang

Haiyang Wang received the PhD degree in physical electronics from the University of Electronic Science and Technology of China (UESTC), Chengdu, China, in 2009. He is currently with the UESTC.

Jianing Zhao

Jianing Zhao is currently pursuing the PhD degree in the University of Electronic Science and Technology of China, Chengdu, China.

Chaoxiong He

Chaoxiong is currently pursuing the PhD degree in the University of Electronic Science and Technology of China, Chengdu, China.