A tunable magnetically insulated transmission line oscillator

Fan, Yuwei; Wang, Xiaoyu; He, Liang; Zhong, Huihuang; Zhang, Jiande

doi:10.1088/1674-1056/24/3/035203

Cited by 24 publications

(8 citation statements)

References 21 publications

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“…14, 15 Fan et al investigated the tunable MILO in detail by particle-in-cell method (KARAT code). 14 It is found that the tunable MILO can generate HPM with 3.0 GW and 1.51 GHz. Moreover, the 3-dB tunable frequency range (the relative output power exceeds half of the peak output power) is 2.25-0.825 GHz.…”

Section: Introductionmentioning

confidence: 95%

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A high-efficiency tunable TEM-TE11 mode converter for high-power microwave applications

et al. 2017

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The tunable high power microwave source (HPM’s) is considered to be an important research direction. However, the corresponding mode converter has been researched little. In this paper, a high-efficiency tunable mode converter (HETMC) is investigated for high-power microwave applications. The HETMC that is consisted of coaxial inner and outer conductors, with four metal plates arranged radially, at 90° in the coaxial gap, and matching rods can transform coaxial transverse electromagnetic (TEM) mode to TE11 coaxial waveguide mode. The results show that adjusting the length of the downstream plate, and the distance between the rods installed upstream and the closest edges of the plates, can improve the conversion efficiency and bandwidth remarkably. Moreover, when the frequency ranges from 1.63 GHz to 2.12 GHz, the conversion efficiency is above 95% between 1.63 GHz and 2.12 GHz with a bandwidth of 26.1%. Besides, the unwished reflection and transmission can be eliminated effectively in the HETMC.

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Section: Introductionmentioning

confidence: 95%

“…The tunable MILO has been investigated in our laboratory. 14,15 Actually, the HETMC is investigated to meet the tunable MILO's requirement. Meanwhile the tunable HTEMC is also applicable to conventional HPMs and other tunable HPMs.…”

Section: Configuration and Designmentioning

confidence: 99%

A high-efficiency tunable TEM-TE11 mode converter for high-power microwave applications

et al. 2017

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“…The tunable MILO has been investigated in our previous work. [4,5] Actually, the investigation of TCTMC is to meet the requirements for tunable MILO. TCTMC is also applicable to conventional HPM and other tunable HPM devices.…”

Section: Structure and Designmentioning

confidence: 99%

“…Coaxial plate-inserted mode converters (CPIMC) and turnstilejunction mode converters (TJMC) have received a great deal of attention because of their particular advantages of high conversion efficiency and easy-to-fabricate. However, these mode converters are only designed for a given frequency, [4,5] whose bandwidth is very narrow. In order to satisfy the need of tunable HPMs, a tunable mode converter should be investigated.…”

Section: Introductionmentioning

confidence: 99%

Tunable circularly-polarized turnstile-junction mode converter for high-power microwave applications

et al. 2018

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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 turnstilejunction mode converter (TCTMC) for high-power microwave applications is presented in this paper. The input coaxial TEM mode is transformed into TE 10 mode with different phase delays in four rectangular waveguides and then converted into a circularly-polarized TE 11 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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“…Of all the high power microwave sources, the magnetically insulated line oscillator (MILO) is considered as one of the most promising HPM devices, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] which has the advantages of high power, stable operation, no external magnetic field, compact structure, etc. However, the power efficiency of MILO is not so high because some intense electron beams are required to generate an insulating magnetic field.…”

Section: Introductionmentioning

confidence: 99%

A compact dual-band radiation system*

Yu¹,

Fan²,

Wang³

2020

Chinese Phys. B

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Complex magnetically insulated transmission line oscillator (MILO), as an important development direction, can enhance the power efficiency and generate dual-band high power microwaves (HPMs). A complex MILO and a preliminary dual-band radiation system have been proposed in our previous studies. However, the axial length of the dual-band radiation system is too long to meet the compact requirements. In this paper, a compact dual-band radiation system is presented and investigated numerically. The compact dual-band radiation system comprises a dual-band cross-shaped mode converter and a dual-band coaxial conical horn antenna. It can convert two coaxial TEM mode microwaves (1.717 GHz and 4.167 GHz) generated by the complex MILO into the coaxial TE11 mode microwaves, and then radiate them into the air. At 1.717 GHz, the gain of the antenna is 17.9 dB, and the total return loss and diffraction loss are 1.50% and 0, respectively. At 4.167 GHz, the gain is 19.4 dB, and the total return loss and diffraction loss are 1.17% and 0.78%, respectively. The power handling capacity of the antenna is 5.1 GW at 1.717 GHz and 2.0 GW at 4.167 GHz. Comparing with the original structure, the length of the dual-band radiation system is reduced by 45.2%.

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A tunable magnetically insulated transmission line oscillator

Cited by 24 publications

References 21 publications

A high-efficiency tunable TEM-TE11 mode converter for high-power microwave applications

A high-efficiency tunable TEM-TE11 mode converter for high-power microwave applications

Tunable circularly-polarized turnstile-junction mode converter for high-power microwave applications

A compact dual-band radiation system*

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