Study of Split-Ring Resonators as a Metamaterial for High-Power Microwave Power Transmission and the Role of Defects

Shiffler, D.; Seviour, Rebecca; Luchinskaya, Elena; Stranford, Erin; Tang, Wilkin; French, David M.

doi:10.1109/tps.2013.2251669

Cited by 35 publications

(13 citation statements)

References 21 publications

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“…MTMs and photonic crystals built of metallic parts can be considered as modified coupled-cavity or ladder structures and are promising for application in TWTs or BWOs. The wave-electron beam interaction in MTMs has been theoretically studied in [8][9][10][11][12][13][14][15]. Here we focus on the MTM-loaded waveguide and its application as an interaction circuit for a vacuum electron device.…”

Section: Introductionmentioning

confidence: 99%

Sub-wavelength waveguide loaded by a complementary electric metamaterial for vacuum electron devices

et al. 2014

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We report the electromagnetic properties of a waveguide loaded by complementary electric split ring resonators (CeSRRs) and the application of the waveguide in vacuum electronics. The S-parameters of the CeSRRs in free space are calculated using the HFSS code and are used to retrieve the effective permittivity and permeability in an effective medium theory. The dispersion relation of a waveguide loaded with the CeSRRs is calculated by two approaches: by direct calculation with HFSS and by calculation with the effective medium theory; the results are in good agreement. An improved agreement is obtained using a fitting procedure for the permittivity tensor in the effective medium theory. The gain of a backward wave mode of the CeSRR-loaded waveguide interacting with an electron beam is calculated by two methods: by using the HFSS model and traveling wave tube theory; and by using a dispersion relation derived in the effective medium model. Results of the two methods are in very good agreement. The proposed all-metal structure may be useful in miniaturized vacuum electron devices.

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Section: Introductionmentioning

confidence: 99%

Sub-wavelength waveguide loaded by a complementary electric metamaterial for vacuum electron devices

et al. 2014

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“…Remarkably, Pierce predicted the small signal gain of a TWT and provided design rules for TWT amplifiers in terms of the SWS and electron beam parameters [2], [9]. In essence, state of the art of the high power TWT technology employs all-metallic slow-wave guiding structures whose dispersion is engineered for (i) matching phase velocity to an electron beam over a wide bandwidth; and (ii) high interaction impedance [10]- [17]. Consequently, dispersion engineering of the SWS eigenmodes would potentially enhance the gain, efficiency and bandwidth of conventional TWTs [18]- [22] and backward wave oscillators (BWOs) [23]- [26].…”

Section: Introductionmentioning

confidence: 99%

A New Amplification Regime for Traveling Wave Tubes With Third-Order Modal Degeneracy

Yazdi

Othman

Veysi

et al. 2018

IEEE Trans. Plasma Sci.

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Engineering of the eigenmode dispersion of slowwave structures (SWSs) to achieve desired modal characteristics, is an effective approach to enhance the performance of high power traveling wave tube (TWT) amplifiers or oscillators. We investigate here for the first time a new synchronization regime in TWTs based on SWSs operating near a third order degeneracy condition in their dispersion. This special three-eigenmode synchronization is associated with a stationary inflection point (SIP) that is manifested by the coalescence of three Floquet-Bloch eigenmodes in the SWS. We demonstrate the special features of "cold" (without electron beam) periodic SWSs with SIP modeled as coupled transmission lines (CTLs) and investigate resonances of SWSs of finite length. We also show that by tuning parameters of a periodic SWS one can achieve an SIP with nearly ideal flat dispersion relationship with zero group velocity or a slightly slanted one with a very small (positive or negative) group velocity leading to different operating schemes. When the SIP structure is synchronized with the electron beam potential benefits for amplification include (i) gain enhancement, (ii) gain-bandwidth product improvement, and (iii) higher power efficiency, when compared to conventional Pierce-like TWTs. The proposed theory paves the way for a new approach for potential improvements in gain, power efficiency and gain-bandwidth product in high power microwave amplifiers.I.

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“…To advance the performance parameters and extend the frequency range of vacuum electronic devices, electromagnetic structures that can enhance and control the mode selection process in the beam wave interaction region are being investigated. Various structures and materials such as diffractive surfaces [1], metamaterials [2], photonic structures [3], metadielectrics and periodic surface lattices [4] are being studied in different regimes of operation. The use of such diverse structures enables the wave dispersion to be engineered within its own discrete parameter space with often shared theoretical principles, and similar numerical modelling methods being used.…”

Section: Introductionmentioning

confidence: 99%

Millimeter-wave periodic surface lattices for mode control in vacuum electronic sources

MacLachlan

Phipps

Robertson

et al. 2017

2017 Eighteenth International Vacuum Electronics Conference (IVEC)

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Periodic surface lattice (PSL) structures of planar geometry have been designed, constructed and measured. The motivation is to study the evolution of electromagnetic fields stimulated by PSLs to improve mode control in overmoded structures in high power electron beam driven THz vacuum electronic sources. The results of studies of the planar structures are presented. Prior to the experimental studies numerical simulations have been carried out and results are compared with experimental measurements. It is demonstrated that volume and surface fields can couple so as to form a cavity eigenmode, which has the potential to be selectively and efficiently excited.

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Study of Split-Ring Resonators as a Metamaterial for High-Power Microwave Power Transmission and the Role of Defects

Cited by 35 publications

References 21 publications

Sub-wavelength waveguide loaded by a complementary electric metamaterial for vacuum electron devices

Sub-wavelength waveguide loaded by a complementary electric metamaterial for vacuum electron devices

A New Amplification Regime for Traveling Wave Tubes With Third-Order Modal Degeneracy

Millimeter-wave periodic surface lattices for mode control in vacuum electronic sources

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