High power millimeter wave helix TWT programs at L-3 ETI

Chong, C.K.; Cordrey, David A.; Dawson, R.C.; Forster, Jeff W.; Layman, Dennis A.; Ramay, M.L.; Stolz, R.J.; Washington, Craig D.

doi:10.1109/ivec.2013.6571166

Cited by 11 publications

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“…The competition between axial deformation (i.e., stretching or compression), bending, and twisting determines the 3D shape of a released NM. The axial (U s ) and bending energy (U b ) scale as U s ∼ tW 5 (κ 0 ) 4 and U b ∼ t 3 W(κ 0 ) 2 , where t and W are the total thickness and the width of a NM ribbon and κ 0 is the spontaneous curvature of the released NM. 24,56−59 Our experimentally realized helices have a microscale radius of curvature, and they are obtained by release of 10 μm-wide conductive strips with thickness in the range of a few 10s-100s nm.…”

Section: Resultsmentioning

confidence: 99%

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Self-Winding Helices as Slow-Wave Structures for Sub-Millimeter Traveling-Wave Tubes

et al. 2020

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We present a transformative route to obtain mass-producible helical slow-wave structures for operation in beam−wave interaction devices at THz frequencies. The approach relies on guided self-assembly of conductive nanomembranes. Our work coordinates simulations of cold helices (i.e., helices with no electron beam) and hot helices (i.e., helices that interact with an electron beam). The theoretical study determines electromagnetic fields, current distributions, and beam− wave interaction in a parameter space that has not been explored before. These parameters include microscale diameter, pitch, tape width, and nanoscale surface finish. Parametric simulations show that beam−wave interaction devices based on selfassembled and electroplated helices will potentially provide gain-bandwidth products higher than 2 dBTHz at 1 THz. Informed by the simulation results, we fabricate prototype helices for operation as slow-wave structures at THz frequencies, using metal nanomembranes. Single and intertwined double helices, as well as helices with one or two chiralities, are obtained by selfassembly of stressed metal bilayers. The nanomembrane stiffness and built-in stress control the diameter of the helices. The inplane geometry of the nanomembrane determines the pitch, the chirality, and the formation of single vs intertwined double helices.

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Section: Resultsmentioning

confidence: 99%

“…TWTs based on helical SWSs are capable of 40 to 70 dB gains with bandwidths exceeding two octaves in a 300 MHz-100 GHz frequency range. , As such, these devices have been the backbone of terrestrial/satellite communications and radar for the last 50 years. A typical contemporary satellite is equipped with on the order of one hundred TWTs.…”

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confidence: 99%

Self-Winding Helices as Slow-Wave Structures for Sub-Millimeter Traveling-Wave Tubes

et al. 2020

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“…Traveling-wave tube amplifiers (TWTAs) play a crucial role in applications demanding high power, efficiency, bandwidth, and linearity. 1,2 Within a TWTA, a traveling wave confined to a helix-like slow-wave structure (SWS) undergoes amplification through energy exchange with an electron beam. Various applications, including high-speed communications, electronic warfare, and research instrumentation, require scaling TWTAs to operate in the THz range of the electromagnetic spectrum.…”

Section: ■ Introductionmentioning

confidence: 99%

Integrated Couplers of THz Radiation for Helical Slow-Wave Structures

Hajitabarmarznaki,

Scott,

Martinez-Argudo

et al. 2024

ACS Omega

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We have designed an integrated device that couples input and output coaxial horn antennas with a self-assembled helical slow-wave structure cradled in a v-groove on a silicon-on-insulator wafer. These devices will potentially enable the characterization of cold parameters and beam-wave interaction in slow-wave structures on a wafer level, i.e., without having to dice and package individual devices. In addition, such vertically integrated antennas and helical slow-wave structures may form the basis of compact and low-cost traveling-wave tube amplifiers operating at THz frequencies.

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“…Advantages of TWTs include moderate beam voltage, moderate structure period to wavelength ratio, high beam power to radiated power transformation efficiency [10], long lifetime [11], and reliability and robustness against high thermal stresses and ionizing radiation typical of the space environment in most space and airborne applications [12]. However, the most interesting advantage is its very wide instantaneous bandwidth, which allows signals to be amplified linearly down to the kilowatt level, even in the millimeter wavelength (mmW) bands [7], where TWTs are excellent devices for communication systems, especially when broadband transmission with moderate power amplification is required in a compact size [13]. The latter makes them ideal for applications such as communications, advanced radar, military electronic countermeasure systems, and space research [5].…”

Section: Introductionmentioning

confidence: 99%

Wide Band Interaction Impedance and Mode Excitation in Glide Symmetric Double Corrugated Waveguides for mm-wave TWTs

Méndez¹,

Saavedra-Melo²,

Rajo‐Iglesias³

et al. 2023

Preprint

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Focusing on traveling wave tube (TWT) applications, the interaction impedance between an electron beam and electromagnetic modes in three distinct, but related, corrugated waveguides that operate at millimeter waves is investigated together with the role of glide symmetry. Two waveguide structures have glide symmetry, and the irreducible Brillouin zone is related to half of the period, leading to a wide band linearity, i.e., nondispersive, property of the dispersion diagram. The investigation of the modes with longitudinal electric field that can be excited shows that the bottom-top glide symmetric corrugated waveguide has a wide band interaction impedance, hence it is a good candidate for millimeter wave TWT amplifiers.

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High power millimeter wave helix TWT programs at L-3 ETI

Cited by 11 publications

References 0 publications

Self-Winding Helices as Slow-Wave Structures for Sub-Millimeter Traveling-Wave Tubes

Self-Winding Helices as Slow-Wave Structures for Sub-Millimeter Traveling-Wave Tubes

Integrated Couplers of THz Radiation for Helical Slow-Wave Structures

Wide Band Interaction Impedance and Mode Excitation in Glide Symmetric Double Corrugated Waveguides for mm-wave TWTs

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