Theoretical investigation of microwave breakdown ignition in OMUX filters. A 3D numerical modeling approach

“…In references , microwave breakdown in resonators and filters is detailed. For the model described in references , the principal electron source is considered to be the cosmic effect and the thermoelectronic emission is not considered.…”

Section: Introductionmentioning

confidence: 99%

Modeling and characterization of microwave breakdown at atmospheric pressure in OMUX filters

Frigui

Bila

Baillargeat

et al. 2013

Int J RF and Microwave Comp Aid Eng

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For output multiplexer (OMUX) filters placed in telecommunication satellites, microwave breakdown happens in an involuntary and undesirable way during tests at atmospheric pressure. This avalanche phenomenon is due to exponential growth of the electronic density caused by thermoelectronic emission under strong electromagnetic field magnitude. In this paper, our objective is to model and characterize experimentally multipole OMUX filters composed with coupled cavities. For identifying the element responsible for the breakdown, the electric field is calculated within each cavity and each iris. In order to characterize the breakdown phenomenon, we proposed an experimental test bench and we measured the power, both at the input and at the output of the filter. The article details the theoretical breakdown prediction and the experimental setup for such a structure. V C 2013Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:46-54, 2014.

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High-power microwave filters and frequency selective surfaces exploiting electromagnetic wave tunneling through ϵ-negative layers

Liu

Behdad

2013

Journal of Applied Physics

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In this paper, we experimentally investigate the phenomenon of electromagnetic wave tunneling through ϵ-negative (ENG) metamaterial layers surrounded by double-positive layers. Initial experiments are conducted by using a rectangular waveguide, which operates below its cutoff frequency to emulate an ENG layer. This ENG layer is then sandwiched by two dielectric substrates with relatively high dielectric constants and it is shown that the entire setup acts as a classical microwave filter with a second-order bandpass response. The power handling capability of this filter is examined experimentally using a high-power magnetron source with a frequency of 9.382 GHz, a pulse duration of 1 μs, and a peak power of 25 kW. Based on the results of this experiment, two methods for improving the power handling capability of these multi-layer structures are proposed. In particular, it is demonstrated that emulating the ENG layers with thin perforated metallic sheets with sub-wavelength holes significantly enhances their peak power handling capability. A prototype of such a device is designed, fabricated, and experimentally characterized and it is demonstrated that it can handle extremely high peak power levels. The results presented in this work are expected to be useful in designing microwave filters and frequency selective surfaces that can handle extremely high peak power levels.

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Theoretical investigation of microwave breakdown ignition in OMUX filters. A 3D numerical modeling approach

Cited by 4 publications

References 5 publications

EVEREST preliminary results on high RF power phenomena

EVEREST preliminary results on high RF power phenomena

Modeling and characterization of microwave breakdown at atmospheric pressure in OMUX filters

High-power microwave filters and frequency selective surfaces exploiting electromagnetic wave tunneling through ϵ-negative layers

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