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Tunable circularly-polarized turnstile-junction mode converter for high-power microwave applications |
| Xiao-Yu Wang(王晓玉), Yu-Wei Fan(樊玉伟), Ting Shu(舒挺), Cheng-Wei Yuan(袁成卫), Qiang Zhang(张强) |
| College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China |
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Abstract Frequency tunability has become a subject of concern in the field of high-power microwave (HPM) source research. However, little information about the corresponding mode converter is available. A tunable circularly-polarized turnstile-junction mode converter (TCTMC) for high-power microwave applications is presented in this paper. The input coaxial TEM mode is transformed into TE10 mode with different phase delays in four rectangular waveguides and then converted into a circularly-polarized TE11 circular waveguide mode. Besides, the rods are added to reduce or even eliminate the reflection. The innovations in this study are as follows. The tunning mechanism is added to the mode converter, which can change the effective length of rectangular waveguide and the distance between the rods installed upstream and the closest edge of the rectangular waveguide, thus improving the conversion efficiency and bandwidth. The conversion efficiency of TCTMC can reach above 98% over the frequency range of 1.42 GHz-2.29 GHz, and the frequency tunning bandwidth is about 47%. Significantly, TCTMC can obtain continuous high conversion efficiency of different frequency points with the change of tuning mechanism.
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Received: 26 December 2017
Revised: 14 March 2018
Accepted manuscript online:
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PACS:
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84.90.+a
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(Other topics in electronics, radiowave and microwave technology, and direct energy conversion and storage)
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84.40.Fe
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(Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No.61671457). |
Corresponding Authors:
Yu-Wei Fan
E-mail: fyw9108212@126.com
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Cite this article:
Xiao-Yu Wang(王晓玉), Yu-Wei Fan(樊玉伟), Ting Shu(舒挺), Cheng-Wei Yuan(袁成卫), Qiang Zhang(张强) Tunable circularly-polarized turnstile-junction mode converter for high-power microwave applications 2018 Chin. Phys. B 27 068401
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