Some perturbation effects in cavity resonators

Cûnliffe, A.V.; Mathias, L.E.S.

doi:10.1049/pi-3.1950.0071

Cited by 8 publications

(4 citation statements)

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“…The basic behavior of a microwave cavity perturbed by a small shape variation has been known for quite some time [21]. The basic effect that can be observed, by introducing a small perturbation dV in the shape of a cavity (see Fig.…”

Section: Cavity Perturbation Theorymentioning

confidence: 99%

On the Alignment of Low-Fidelity and High- Fidelity Simulation Spaces for the Design of Microwave Waveguide Filters

Ossorio

Melgarejo

Boria

et al. 2018

IEEE Trans. Microwave Theory Techn.

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Ossorio-García, J.; Melgarejo-Lermas, JC.; Boria Esbert, VE.; Guglielmi, M.; Bandler, J. (2018). On the Alignment of Low-Fidelity and High-Fidelity Simulation Spaces for the Design of Microwave Waveguide Filters. IEEE Transactions on Microwave Theory and Techniques. 66(12):5183-5196. https://doi.Abstract-The objective of this paper is to advance the stateof-the-art of Aggressive Space Mapping (ASM) by demonstrating how, for resonant structures, and microwave filters in particular, an ASM based optimization procedure may converge to the desired target performance in just one step. This behavior is first justified in physical terms, using the Electromagnetic (EM) cavity perturbation theory, and is then investigated numerically. Several practical filter design demonstrations are also presented. The paper is concluded with a conceptual definition of Space Alignment in the context of ASM.

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Section: Cavity Perturbation Theorymentioning

confidence: 99%

On the Alignment of Low-Fidelity and High- Fidelity Simulation Spaces for the Design of Microwave Waveguide Filters

Ossorio

Melgarejo

Boria

et al. 2018

IEEE Trans. Microwave Theory Techn.

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“…In the special case where the coarse and fine models belong to the same physical domain (for example, if they both are waveguide models), the matrix B can be very well approximated by the identity matrix. An explanation of this remarkable finding was provided in [35] in terms of cavity perturbation theory [83]. In this section, we will verify that same finding by finite differences for the simple three-pole inductive filter shown in Fig.…”

Section: One-step Asmsupporting

confidence: 74%

Advanced Techniques for the Design and Optimization of Multi-Band and Reconfigurable Microwave Waveguide Filters

Lermas¹

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El creciente número de dispositivos intercambiando datos ha empujado a las empresas del sector espacial a utilizar bandas de frecuencia cada vez más altas, como Ku, K y Ka, ya que permiten emplear canales de frecuencia más anchos. A medida que disminuye la longitud de onda, el tamaño de los filtros se reduce y, por tanto, son más sensibles a las desviaciones de fabricación. Para compensar estos errores, es necesario emplear elementos de sintonía en la etapa de diseño.En este contexto presentamos una estrategia de diseño que permite incluir todos los factores no ideales, como elementos de sintonía o esquinas redondeadas, en las simulaciones finales de filtros y multiplexores.Una vez se han fabricado los filtros es necesario ajustar manualmente los elementos de sintonía hasta recuperar la respuesta objetivo. Sin embargo, para realizar esta tarea con éxito es necesario tener mucha experiencia previa y, aún así, conlleva un tiempo considerable. Por tanto, también proponemos un procedimiento de sintonización eficiente y sistemático que permite a cualquier persona, independientemente de su experiencia previa en sintonización, realizar esta tarea con éxito.Además del aumento de las tasas de transmisión, otros desafíos del sector espacial son reducir el tamaño y peso de sus componentes, así como dotarlos de capacidad de reconfiguración. Emplear dispositivos multifunción como filtros multibanda o dispositivos reconfigurables es una posible solución. En este contexto, proponemos una nueva familia de filtros multibanda en guía de ondas que puede adaptarse a las futuras necesidades del sector espacial. Con el mismo objetivo, también proponemos una familia de dispositivos reconfigurables de varios estados discretos que pueden modificar su comportamiento de forma remota. v ResumEl creixent nombre de dispositius intercanviant dades ha empés a les empreses del sector espacial a utilitzar bandes de freqüència cada vegada més altes, com Ku, K i Ka, ja que permeten fer servir canals de freqüència més amples. A mesura que la longitud d'ona disminueix, la mida dels filtres es redueix i, per tant, són més sensibles a les desviacions de fabricació. Per compensar aquests errors, és necessari fer servir elements de sintonia en l'etapa de disseny.En aquest context presentem una estratègia de disseny que permet incloure tots els factors no ideals, com a elements de sintonia o cantonades arrodonides, en les simulacions finals de filtres i multiplexors.Una vegada s'han fabricat els filtres és necessari ajustar manualment els elements de sintonia fins a recuperar la resposta objectiu. Però, per realitzar aquesta tasca amb èxit és necessari tenir molta experiència prèvia i, així i tot, comporta un temps considerable. Per tant, també proposem un procediment de sintonització eficient i sistemàtic que permet a qualsevol persona, independentment de la seua experiència prèvia en sintonització, realitzar aquesta tasca amb èxit.A més de l'augment de les taxes de transmissió, altres desafiaments de el sector espacial són reduir la mida i pes dels seus...

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“…The peak E and H field intensities in the cavity at the central and circumferential sample positions within the TM010 mode are calculated to be approximately 9.3 kV/m and 70 A/m (corresponding to a magnetic flux density of 87.9 µT), respectively. By placing the sample tube into the three-hole TM010 mode cavity, the field is perturbed (22,25,26). For this reason, the Q value (representing the amount power dissipated into the sample) at the three sample positions was measured using sample volumes of 170 µL (Table I).…”

Section: Mw System Componentsmentioning

confidence: 99%

The biological effect of 2.45 GHz microwaves on the viability and permeability of bacterial and yeast cells

Ahortor

Malyshev

Williams

et al. 2020

Journal of Applied Physics

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Microwaves are a form of non-ionising radiation composed of electric (E) and magnetic (H) fields and are absorbed by biological tissues with a high water content. Our study investigated the effect of the E field, H field and a combination of both (E+H) fields exposure of structurally diverse micro-organisms, at a frequency of 2.45 GHz. We observed that the exposure to a microwave E field of amplitude 9.3 kV/m had no significant effect on cell viability; however, dextran particles. In terms of efflux, DNA was detected following E field exposure of M. smegmatis. In contrast, H field exposure had no effect on cell viability and did not contribute to increase cells membrane to dextran particles. In conclusion, this study shows that microwave generated E fields can temporarily disrupt membrane integrity without detrimentally impacting on cell viability. This approach has the potential to be developed as a high efficiency electropermeabilisation method and as a means of releasing host DNA to support diagnostic applications.

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Some perturbation effects in cavity resonators

Cited by 8 publications

References 1 publication

On the Alignment of Low-Fidelity and High- Fidelity Simulation Spaces for the Design of Microwave Waveguide Filters

On the Alignment of Low-Fidelity and High- Fidelity Simulation Spaces for the Design of Microwave Waveguide Filters

Advanced Techniques for the Design and Optimization of Multi-Band and Reconfigurable Microwave Waveguide Filters

The biological effect of 2.45 GHz microwaves on the viability and permeability of bacterial and yeast cells

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