Practical Constraints on Nonlinear Transmission Lines for RF Generation

Rangel, Elizete G. L.; Rossi, J.O.; Barroso, Joaquim J.; Yamasaki, Fernanda S.; Schamiloglu, E.

doi:10.1109/tps.2018.2876020

Cited by 33 publications

(15 citation statements)

References 57 publications

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“…Applying a pulse generates a magnetic field that causes a precession of the magnetic moments to create an RF pulse. The microwave oscillations produced by ferroelectric materials produce lower frequency oscillations than ferromagnetic materials [78].…”

Section: Nonlinear Bulk Materialsmentioning

confidence: 98%

A Review of Nonlinear Transmission Line System Design

2020

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Nonlinear transmission lines (NLTLs) have been increasingly studied to produce high power microwaves (HPM) at higher repetition rates than conventional HPM devices without requiring the same auxiliary systems. The ability to array NLTLs to produce higher power and achieve beam steering provides an additional capability. This review summarizes the various NLTL topologies designed to achieve these design objectives. Specifically, we summarize modeling and experimental studies for three primary topologies: the lumped element NLTL, the split ring resonator, and the traditional transmission line geometry using nonlinear materials. The lumped element NLTL and the traditional transmission line constructed with nonlinear materials lend themselves to higher power applications, while the split ring resonator is better suited for applications involving antennas. We provide a detailed summary of past studies for these topologies and conclude by exploring ongoing work and future opportunities for technological development.

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Section: Nonlinear Bulk Materialsmentioning

confidence: 98%

A Review of Nonlinear Transmission Line System Design

2020

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“…The set of materials appropriate to the design requirements was selected to choose the suitable materials, considering aspects not described by the charts, such as material resistance and demagnetization curve. 4. The electromagnetic simulations of the arrangement using the selected permanent magnets were performed using the software CST StudioSuite ® [22], version 2019, to obtain a flat profile of the magnetic field along the length of the line.…”

Section: Permanent Magnetsmentioning

confidence: 99%

“…This technology represents a new alternative to generate RF without the use of an electron beam or need for a vacuum. They are one of two types: (1) a dispersive network of inductor-capacitor (LC) cells in the VHF band MHz) [2], [3] where at least one component must be nonlinear (L or C) and (2) a continuous coaxial line, called a gyromagnetic line, operating in L band (1-2 GHz) [4]. The latter one is the focus of the study in this work.…”

Section: Introductionmentioning

confidence: 99%

Material Selection for Axial Magnetization of a Gyromagnetic NLTL for Space Applications

Teixeira

Yamasaki

Rossi

et al. 2021

J. Microw. Optoelectron. Electromagn. Appl.

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Nonlinear Transmission Lines (NLTLs) are a new technique for radio frequency (RF) generation. A loaded ferrite NLTL, known as a gyromagnetic line, uses a solenoid to provide an external magnetic bias. In space applications, specifically in satellites, the replacement of these solenoids by permanent magnets is desirable, eliminating the need for a DC current source, and reducing the weight and the effective cost of the launch. This work investigated and selected permanent magnets for this application, and then computationally modeled the magnet assembly to analyze the resulting magnetic field generated and obtained a uniform field region to meet the NLTL operating specifications. For this, we employed selection charts for the proper choice of material to use in an arrangement of magnets simulated by the electromagnetic software CST Microwave Studio. Magnetic fields with uniformity variations of less than 6% and 23% in regions extended over 18.5 cm and 58.8 cm, corresponding to line lengths of 26.6 cm and 68.0 cm, respectively, were achieved in simulations.

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“…The concept that in a nonlinear wave propagation system the various parts of the wave travel with different velocities, and that wave fronts (or tails) can sharpen into shock waves, is deeply imbedded in the classical theory of fluid dynamics 1 . The methods developed in that field can be profitably used to study signal propagation in nonlinear transmission lines [2][3][4][5][6][7][8][9][10][11] . In the early studies of shock waves in transmission lines, the origin of the nonlinearity was due to nonlinear capacitance in the circuit [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%