Self-consistent modeling of terahertz waveguide and cavity with frequency-dependent conductivity

Huang, Yu-Lieh; Chu, K. R.; Thumm, M.

doi:10.1063/1.4905627

Cited by 11 publications

(14 citation statements)

References 27 publications

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“…Similar general conclusions have been also recently reported in [391]. Actually, this CWG problem is the dual problem of the single metal wire (deeply analyzed in the next chapter), if one exchanges metal and air.…”

Section: Metallic (Microwave) Waveguides and Transmission Linessupporting

confidence: 65%

“…In a similar way, commercial tools should incorporate in their algorithms, strategies to proper characterize the complex effects caused by complex values of ε r in dielectrics, that can be either metals at high frequencies, as afforded here, or metamaterials, also of great interest. In this way, errors that have been evidenced in [355], [354], [348], or [391], would be avoided. This last suggested work line is mandatory in order that THz devices can be properly designed with the same efficiency level as in the microwave or optical bands.…”

Section: Conclusion and Important Remarksmentioning

confidence: 99%

“…This has a simple reason: there are not simple and direct ways to do it in a more accurate way, and the simulation techniques employed in the microwave regime drag the researcher with an obvious inertia. However, a small group of researches is providing evidences that the Drude model is both, necessary and sufficient, [348], [355], [356], [391], [548]. Nevertheless, those works have not achieved yet the necessary impact to impulse an appreciable change in the analysis techniques.…”

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confidence: 99%

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Analysis and design of efficient passive components for the millimeter-wave and THz bands

Verdú¹,

Antonio²

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To my parents, brother and sister."Success is peace of mind which is a direct result of self-satisfaction in knowing you made the effort to become the best of which you are capable."Jonh Wooden "Lo que con mucho trabajo se adquiere, más se ama." Aristóteles AgradecimientosLa realización de esta tesis ha implicado no pocos años de trabajo y esfuerzo. Durante este importante periodo de mi vida han sido muchas las personas han estado a mi lado, brindándome su apoyo, ayuda, cariño y amor. Ya sea de una forma u otra, todas estas personas han contribuido a que este trabajo haya sido posible dando como fruto esta tesis. A todos ellos, me gustaría dedicarles un agradecimiento muy especial de todo corazón.Sin duda alguna, debo dar las gracias en primer lugar a mi director de tesis Mariano Baquero. Mariano, has sido un padre para mí profesionalmente hablando. Te conocí como alumno en las clases de Microondas, en las cuales me abriste la puerta a un conocimiento que me fascinó.Recuerdo perfectamente cuando fui a verte para preguntarte si podrías dirigirme el Proyecto Final de Carrera, y desde ese año 2009 hemos estado trabajando juntos. Quiero agradecerte no sólo haberme dado la oportunidad de trabajar en cada momento en elárea que más me ha gustado, sino el haberte preocupado por mí a nivel personal, velando siempre por mis intereses, ayudándome a desarrollarme personal y profesionalmente. Extiendo en este sentido mi agradecimiento a Miguel Ferrando. Si Mariano es el padre, tu serías sin duda el abuelo. Sin tu ayuda, la beca para la realización de esta tesis y los proyectos que han respaldado la misma no hubieran sido posibles. Tu esfuerzo ha permitido que el Grupo de Radiación Electromagnética (GRE) esté hoy dónde esta y que sus miembros nos beneficiemos de un entorno de trabajo excelente, produciendo trabajo de calidad. Debo agradecerte también tus siempre innovadoras ideas, algunas de las cuales se han convertido en una realidad plasmada en esta tesis.Una mención especial merece Daniel Sánchez. Dani, aunque tu nombre no figure como co-director bien sabes que podría estarlo. Jamás podré agradecerte lo suficiente la ayuda que me has prestado. Cuántas horas dedicadas a enseñarme en un sin fin de aspectos sin esperar nada a cambio, apoyándome también en los momentos difíciles, siempre presentes en una tesis. Bien sabes que lo mismo has hecho con cada uno tus compañeros, por eso eres el pilar del GRE Dani.Otra persona a la que estoy muy agradecido es a Vicente Boria. Tu activa colaboración en la dirección de esta tesis ha sido indispensable para la consecución de los resultados más relevantes de la misma. Sugeriste muy acertadamente una estancia en la Queen's University of Belfast, y me abriste la puerta a nuevas líneas de investigación en las cuales seguimos trabajando actualmente. Gracias por preocuparte por mi a nivel profesional y personal.En elámbito anterior, extiendo los agradecimientos a todo el GRE. It is also very important for me to acknowledge Prof. Vince Fusco. Thank you for hosting me in your group in Belfast ...

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Section: Metallic (Microwave) Waveguides and Transmission Linessupporting

confidence: 65%

Section: Conclusion and Important Remarksmentioning

confidence: 99%

mentioning

confidence: 99%

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Analysis and design of efficient passive components for the millimeter-wave and THz bands

Verdú¹,

Antonio²

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“…Here the results of a cylindrical waveguide are referred to. Assuming that the time and space dependence is expressed as exp( jωt ± jk z z ), the modified transverse wave number can be given as follows

k_{_{m n}}^{2} = \{\begin{matrix} left k_{_{m n 0}}^{2} ((), 1 - ((), 1 - j) \frac{δ}{r_{w}} ((), 1 + \frac{m^{2}}{{χ_{m n}}^{2} - m^{2}} \frac{ω^{2}}{{ω_{c}}^{2}})) (TE mode) \\ left k_{_{m n 0}}^{2} ((), 1 - (1 - j) \frac{δ}{r_{w}} \frac{ω^{2}}{{ω_{c}}^{2}}) (TM mode) \end{matrix}

where k mn is the first‐order perturbation transverse wave number, k mn 0 = χ mn / r w represents the unperturbed value, χ mn is the eigenvalue of TE(TM) mn mode, r w is the radius of waveguide, δ and ω c are skin depth and cutoff angular frequency, respectively. The equation above actually demonstrates a self‐consistent modeling of lossy waveguide.…”

Section: Introductionmentioning

confidence: 99%

Strong Dispersive Propagation of Terahertz Wave: Time‐Domain Self‐Consistent Modeling of Metallic Wall Losses

Gao

et al. 2020

Advcd Theory and Sims

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The dispersion characteristics of electromagnetic waves have led to a wide range of applications, such as pulse compression, superluminal propagation, wave tunneling effect, and electron–wave interaction. The near‐cutoff wave inside a guiding system is strong dispersive. When the wave frequency reaches the terahertz band, this strong dispersive property is extremely sensitive to the losses induced by the limited conductivity of the component. This phenomenon is traditionally investigated through perturbation of boundary conditions in the frequency domain, which does not deal well with broad‐spectrum signals. Two simple and efficient time‐domain schemes to study the strong dispersive propagation of terahertz waves are proposed. One is based on relatively concise principles, called the constant frequency method. The second is the recursive convolution method, which is suitable for dealing with a wave with wider spectrum range. The reliability of both approaches is verified by the comparison of the dispersion curves. Using the proposed methods, the pulse compression of terahertz wave inside a strong dispersive waveguide is verified in principle.

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“…Among other applications, dielectric-loaded waveguides have found applications in gyro-devices including gyrotron [2][3][4], gyro-TWT [5][6][7][8][9][10][11][12][13], CARM [14] and others [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The gyro-devices usually employ RF structures with small structural nonuniformities.…”

Section: Introductionmentioning

confidence: 99%

Analogy Between Circular Core-Cladding and Impedance Waveguides and Their Membrane Functions

Shcherbinin¹,

Zaginaylov²,

Ткаченко³

2017

PIER M

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Abstract-One-side boundary conditions on the field inside core region are obtained for core-cladding waveguide with anisotropic cladding. The boundary conditions involve two functions acting as components of anisotropic surface impedance for cladding material. These functions are determined in relation to desired values for step-index waveguide and dielectric-lined waveguide with either perfectly or finitely conducting walls. With resulting surface impedance, the perfect analogy between corecladding and impedance waveguide is achieved. Using this analogy, independent eigenvalue problems are obtained for membrane functions of HE and EH waves of core-cladding waveguide. From this result some conclusions about electromagnetic properties of HE and EH waves are drawn.

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Self-consistent modeling of terahertz waveguide and cavity with frequency-dependent conductivity

Cited by 11 publications

References 27 publications

Analysis and design of efficient passive components for the millimeter-wave and THz bands

Analysis and design of efficient passive components for the millimeter-wave and THz bands

Strong Dispersive Propagation of Terahertz Wave: Time‐Domain Self‐Consistent Modeling of Metallic Wall Losses

Analogy Between Circular Core-Cladding and Impedance Waveguides and Their Membrane Functions

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