A Brief Technology Survey of High-Power Microwave Sources

Bacon, L.D.; Rinehart, Larry F.

doi:10.2172/782595

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Due to condition of mode conversion, phase difference between different groups must be 2nπ. Propagation constants of six SWGs are all the same, so the phase difference only depends on length difference of bent SWGs which can be seen from equation 3 are lengths of SWGs marked with 1, 2, 3 shown in Figure 5. As can be seen, phase difference can be regulated by r 1 and r 2 when θ is given.…”

Section: Six Metal Plates Bending 90 • For Coaxial Tem Mode Transmissionmentioning

confidence: 99%

“…Many high-power microwave (HPM) sources produce microwaves which have axial symmetry, and circular waveguide (CWG) TM 01 mode and coaxial transverse electromagnetic (TEM) mode are common ones [1][2][3]. In order to reasonably arrange the overall system, the bent waveguides transmitting CWG TM 01 mode and coaxial TEM mode are often used to connected HPM source and subordinate system, such as array antenna [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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High Power Over-Mode Bent Waveguides for Circular Tm01 and Coaxial Tem Mode Transmission

Li¹,

Li²,

Liu³

et al. 2017

PIER M

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Abstract-Three bent waveguides are proposed and investigated, two for circular waveguide TM 01 mode and one for coaxial TEM mode. For high power-handling capacity, all of them are over-mode waveguides. In the bend, circular or coaxial waveguides transmitting only sector waveguide TE 11 modes are split into several same sector waveguides by metal plates and metal rod. These sector waveguides are grouped by their lengths. Length differences of sector waveguides lead to phase differences of the sector waveguide TE 11 modes after bending. Due to requirements of mode conversion, the phase difference regulated by radii of circular waveguide and metal rod must be 2nπ, n = 0, 1, 2, . . .. Since the phase difference is independent of bend radius, the radius could be as small as possible. One of the prototypes is experimentally verified, and the test results of the VSWR show that simulation has good match to experiment. Insertion loss is 0.2 dB at 8.4 GHz, which proves the feasibility of the prototype.

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Section: Six Metal Plates Bending 90 • For Coaxial Tem Mode Transmissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Power Over-Mode Bent Waveguides for Circular Tm01 and Coaxial Tem Mode Transmission

Li¹,

Li²,

Liu³

et al. 2017

PIER M

View full text Add to dashboard Cite

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Progress in narrowband high-power microwave sources

Zhang

Fan

et al. 2020

Physics of Plasmas

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Even after 50 years of development, narrowband high-power microwave (HPM) source technologies remain the focus of much research due to intense interest in innovative applications of HPMs in fields such as directed energy, space propulsion, and high-power radar. A few decades ago, the main aim of investigations in this field was to enhance the output power of a single HPM source to tens or hundreds of gigawatts, but this goal has proven difficult due to physical limitations. Therefore, recent research into HPM sources has focused on five main targets: phase locking and power combination, high power efficiency, compact sources with a low or no external magnetic field, high pulse energy, and high-power millimeter-wave generation. Progress made in these aspects of narrowband HPM sources over the last decade is analyzed and summarized in this paper. There is no single type of HPM source capable of excellent performance in all five aspects. Specifically, high pulse energy cannot be achieved together with high power efficiency. The physical difficulties of high power generation in the millimeter wave band are discussed. Semiconductor-based HPM sources and metamaterial (MTM) vacuum electron devices (VEDs) are also commented on here. Semiconductor devices have the advantage of smart frequency agility, but they have low power density and high cost. MTM VEDs have the potential to be high power efficiency HPM sources in the low frequency band. Moreover, problems relating to narrowband HPM source lifetime and stability, which are the important determinants of the real-world applicability of these sources, are also discussed.

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A Brief Technology Survey of High-Power Microwave Sources

Cited by 2 publications

References 9 publications

High Power Over-Mode Bent Waveguides for Circular Tm01 and Coaxial Tem Mode Transmission

High Power Over-Mode Bent Waveguides for Circular Tm01 and Coaxial Tem Mode Transmission

Progress in narrowband high-power microwave sources

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