Bias-field controlled phasing and power combination of gyromagnetic nonlinear transmission lines

Journal Article · Thu May 15 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4878339· OSTI ID:22308858

Bragg, J.-W. B.; Gonsalves, N. R.; Johnson, J. M.; Neuber, A. A.; Dickens, J. C.; Mankowski, J. J. ^[1]

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1. Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, Texas 79409 (United States)

Gyromagnetic Nonlinear Transmission Lines (NLTLs) generate microwaves through the damped gyromagnetic precession of the magnetic moments in ferrimagnetic material, and are thus utilized as compact, solid-state, frequency agile, high power microwave (HPM) sources. The output frequency of a NLTL can be adjusted by control of the externally applied bias field and incident voltage pulse without physical alteration to the structure of the device. This property provides a frequency tuning capability not seen in many conventional e-beam based HPM sources. The NLTLs developed and tested are mesoband sources capable of generating MW power levels in the L, S, and C bands of the microwave spectrum. For an individual NLTL the output power at a given frequency is determined by several factors including the intrinsic properties of the ferrimagnetic material and the transmission line structure. Hence, if higher power levels are to be achieved, it is necessary to combine the outputs of multiple NLTLs. This can be accomplished in free space using antennas or in a transmission line via a power combiner. Using a bias-field controlled delay, a transient, high voltage, coaxial, three port, power combiner was designed and tested. Experimental results are compared with the results of a transient COMSOL simulation to evaluate combiner performance.

• OSTI ID: 22308858
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANTENNAS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CONTROL
ELECTRIC POTENTIAL
ELECTRICAL TRANSIENTS
ELECTRON BEAMS
FERRIMAGNETIC MATERIALS
FREQUENCY SELECTION
MAGNETIC MOMENTS
MICROWAVE RADIATION
MICROWAVE SPECTRA
NONLINEAR PROBLEMS
POWER TRANSMISSION LINES
PRECESSION
PULSES