Compact four-way microwave power combiner for high power applications

Chang, Chao; Xiong, Zhengfeng; Guo, Letian; Wu, Xiaolong; Liu, Yansheng; Xing, Xiaoyue; Li, Zhiguo

doi:10.1063/1.4880741

Cited by 33 publications

(3 citation statements)

References 21 publications

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“…5(b) illustrates a space-charge field established above the dielectric surface. Consequently, the nonlinear space-charge field may exist at the dielectric-air interface for many HPM horn configurations during ultrafast HPM pulses and the mechanism is significantly different from the multipactor discharge [22][23][24][25][26] at the dielectric-vacuum interface of the HPM horn.…”

Section: Effects and Factors Of Surface Electron Emissionmentioning

confidence: 98%

Ultrafast high-power microwave window breakdown: Nonlinear and postpulse effects

et al. 2014

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The time- and space-dependent optical emissions of nanosecond high-power microwave discharges near a dielectric-air interface have been observed by nanosecond-response four-framing intensified-charged-coupled device cameras. The experimental observations indicate that plasma developed more intensely at the dielectric-air interface than at the free-space region with a higher electric-field amplitude. A thin layer of intense light emission above the dielectric was observed after the microwave pulse. The mechanisms of the breakdown phenomena are analyzed by a three-dimensional electromagnetic-field modeling and a two-dimensional electromagnetic particle-in-cell simulation, revealing the formation of a space-charge microwave sheath near the dielectric surface, accelerated by the normal components of the microwave field, significantly enhancing the local-field amplitude and hence ionization near the dielectric surface. The nonlinear positive feedback of ionization, higher electron mobility, and ultraviolet-driven photoemission due to the elevated electron temperature are crucial for achieving the ultrafast discharge. Following the high-power microwave pulse, the sheath sustains a glow discharge until the sheath collapses.

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Section: Effects and Factors Of Surface Electron Emissionmentioning

confidence: 98%

Ultrafast high-power microwave window breakdown: Nonlinear and postpulse effects

et al. 2014

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“…However, not all applications require the HOM electromagnetic waves. Many applications require the fundamental mode electromagnetic waves, such as the multi-way microwave power combiner and high-power microwave feed antennas [27,28]. The HOM SWDs with the MC could be used in more applications.…”

Section: Te N0 -Te 10 MCmentioning

confidence: 99%

Simulation Study of a High-Order Mode Bwo With Multiple Inclined Rectangular Electron Beams

Wang¹,

Zhang²,

Gao³

2021

PIER C

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A backward wave oscillator (BWO) operating at the high-order mode (HOM) with multiple inclined rectangular electron beams (IRBs) is presented in this article. The BWO operating at the HOM with multiple IRBs (HOM IRB BWO) is driven by multiple IRBs. Compared with typical BWOs, the slow wave structure of the HOM IRB BWO is an overmoded metal-grating rectangular waveguide (OGRWG). The mode competition of the slow-wave device operating at the HOM is analyzed according to the ohmic losses of different modes of the OGRWG slow wave structure and multiple beams exciting. The analysis is verified by simulation. Two kinds of HOM-fundamental mode converters (MCs) are designed for converting the HOM generated by the HOM IRB BWO into the fundamental mode. The beam-wave interaction of the HOM IRB BWOs with the HOM-fundamental MC is studied. The results show that the mode competition does not occur; frequency spectrums of output signals are pure; and the HOM is converted into the fundamental mode effectively.

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“…In order to achieve improved radiation directionality, multichannel coupling, and enhanced space transmission, mode converters are commonly employed to convert high-order modes to the rectangular waveguide fundamental mode-TE10 which has a peak gain at the aperture in their radiation patterns and, hence, high propagation stability [4][5][6]. Several high-power radiation systems pump-in or pump-out radio frequency (RF) energy in the rectangular waveguide TE10 mode to achieve this [7][8][9], and the mode excitation of some antennas requires the rectangular waveguide TE10 mode. The rectangular waveguide TE10 mode itself has a relatively wide range of applications, including …., …, and ….. [ref,ref,ref].…”

Section: Introductionmentioning

confidence: 99%

Development of a Ka-Band Circular TM₀₁ to Rectangular TE₁₀ Mode Converter

Chen

Meng

Yang

et al. 2020

IEEE Trans. Electron Devices

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The output/input circuit is a core component in all high-power millimeterwave (MMW) radiation sources, and its performance specifications and reliability directly impact upon the performance of the radiation device. Central to achieving high output power is the development of efficient mode converters. Here we report on the development of , a compact ka-band circular waveguide TM01-rectangular waveguide TE10 mode converter. The present mode converter adopts an all-metal waveguide structure and facilitates notable improvement in the system power capacity and is capable of realizing high-power propagation. The mode converter realizes effective mode conversion between high-order and fundamental modes, as well as allowing longitudinal and transverse transmission. Our simulation and empirical findings have shown mode purity as high as 96% in the frequency range of 32.7 -34.6 GHzwith a return loss S11 < -19.3 dB. The bandwidth of the converter is 2.4 GHz with transmission coefficient S21 ≥ -1 dB. We anticipate these results will provide a strong foundation for the development of ever more sophisticated and high power, compact vacuum electron devices and advanced radiation sources.

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Compact four-way microwave power combiner for high power applications

Cited by 33 publications

References 21 publications

Ultrafast high-power microwave window breakdown: Nonlinear and postpulse effects

Ultrafast high-power microwave window breakdown: Nonlinear and postpulse effects

Simulation Study of a High-Order Mode Bwo With Multiple Inclined Rectangular Electron Beams

Development of a Ka-Band Circular TM₀₁ to Rectangular TE₁₀ Mode Converter

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Compact four-way microwave power combiner for high power applications

Cited by 33 publications

References 21 publications

Ultrafast high-power microwave window breakdown: Nonlinear and postpulse effects

Ultrafast high-power microwave window breakdown: Nonlinear and postpulse effects

Simulation Study of a High-Order Mode Bwo With Multiple Inclined Rectangular Electron Beams

Development of a Ka-Band Circular TM01 to Rectangular TE10 Mode Converter

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Product

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Development of a Ka-Band Circular TM₀₁ to Rectangular TE₁₀ Mode Converter